diff options
Diffstat (limited to 'app/nginx/src/http/modules/ngx_http_mp4_module.c')
| -rw-r--r-- | app/nginx/src/http/modules/ngx_http_mp4_module.c | 3548 |
1 files changed, 3548 insertions, 0 deletions
diff --git a/app/nginx/src/http/modules/ngx_http_mp4_module.c b/app/nginx/src/http/modules/ngx_http_mp4_module.c new file mode 100644 index 0000000..f3c0fdd --- /dev/null +++ b/app/nginx/src/http/modules/ngx_http_mp4_module.c @@ -0,0 +1,3548 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +#define NGX_HTTP_MP4_TRAK_ATOM 0 +#define NGX_HTTP_MP4_TKHD_ATOM 1 +#define NGX_HTTP_MP4_MDIA_ATOM 2 +#define NGX_HTTP_MP4_MDHD_ATOM 3 +#define NGX_HTTP_MP4_HDLR_ATOM 4 +#define NGX_HTTP_MP4_MINF_ATOM 5 +#define NGX_HTTP_MP4_VMHD_ATOM 6 +#define NGX_HTTP_MP4_SMHD_ATOM 7 +#define NGX_HTTP_MP4_DINF_ATOM 8 +#define NGX_HTTP_MP4_STBL_ATOM 9 +#define NGX_HTTP_MP4_STSD_ATOM 10 +#define NGX_HTTP_MP4_STTS_ATOM 11 +#define NGX_HTTP_MP4_STTS_DATA 12 +#define NGX_HTTP_MP4_STSS_ATOM 13 +#define NGX_HTTP_MP4_STSS_DATA 14 +#define NGX_HTTP_MP4_CTTS_ATOM 15 +#define NGX_HTTP_MP4_CTTS_DATA 16 +#define NGX_HTTP_MP4_STSC_ATOM 17 +#define NGX_HTTP_MP4_STSC_START 18 +#define NGX_HTTP_MP4_STSC_DATA 19 +#define NGX_HTTP_MP4_STSC_END 20 +#define NGX_HTTP_MP4_STSZ_ATOM 21 +#define NGX_HTTP_MP4_STSZ_DATA 22 +#define NGX_HTTP_MP4_STCO_ATOM 23 +#define NGX_HTTP_MP4_STCO_DATA 24 +#define NGX_HTTP_MP4_CO64_ATOM 25 +#define NGX_HTTP_MP4_CO64_DATA 26 + +#define NGX_HTTP_MP4_LAST_ATOM NGX_HTTP_MP4_CO64_DATA + + +typedef struct { + size_t buffer_size; + size_t max_buffer_size; +} ngx_http_mp4_conf_t; + + +typedef struct { + u_char chunk[4]; + u_char samples[4]; + u_char id[4]; +} ngx_mp4_stsc_entry_t; + + +typedef struct { + uint32_t timescale; + uint32_t time_to_sample_entries; + uint32_t sample_to_chunk_entries; + uint32_t sync_samples_entries; + uint32_t composition_offset_entries; + uint32_t sample_sizes_entries; + uint32_t chunks; + + ngx_uint_t start_sample; + ngx_uint_t end_sample; + ngx_uint_t start_chunk; + ngx_uint_t end_chunk; + ngx_uint_t start_chunk_samples; + ngx_uint_t end_chunk_samples; + uint64_t start_chunk_samples_size; + uint64_t end_chunk_samples_size; + off_t start_offset; + off_t end_offset; + + size_t tkhd_size; + size_t mdhd_size; + size_t hdlr_size; + size_t vmhd_size; + size_t smhd_size; + size_t dinf_size; + size_t size; + + ngx_chain_t out[NGX_HTTP_MP4_LAST_ATOM + 1]; + + ngx_buf_t trak_atom_buf; + ngx_buf_t tkhd_atom_buf; + ngx_buf_t mdia_atom_buf; + ngx_buf_t mdhd_atom_buf; + ngx_buf_t hdlr_atom_buf; + ngx_buf_t minf_atom_buf; + ngx_buf_t vmhd_atom_buf; + ngx_buf_t smhd_atom_buf; + ngx_buf_t dinf_atom_buf; + ngx_buf_t stbl_atom_buf; + ngx_buf_t stsd_atom_buf; + ngx_buf_t stts_atom_buf; + ngx_buf_t stts_data_buf; + ngx_buf_t stss_atom_buf; + ngx_buf_t stss_data_buf; + ngx_buf_t ctts_atom_buf; + ngx_buf_t ctts_data_buf; + ngx_buf_t stsc_atom_buf; + ngx_buf_t stsc_start_chunk_buf; + ngx_buf_t stsc_end_chunk_buf; + ngx_buf_t stsc_data_buf; + ngx_buf_t stsz_atom_buf; + ngx_buf_t stsz_data_buf; + ngx_buf_t stco_atom_buf; + ngx_buf_t stco_data_buf; + ngx_buf_t co64_atom_buf; + ngx_buf_t co64_data_buf; + + ngx_mp4_stsc_entry_t stsc_start_chunk_entry; + ngx_mp4_stsc_entry_t stsc_end_chunk_entry; +} ngx_http_mp4_trak_t; + + +typedef struct { + ngx_file_t file; + + u_char *buffer; + u_char *buffer_start; + u_char *buffer_pos; + u_char *buffer_end; + size_t buffer_size; + + off_t offset; + off_t end; + off_t content_length; + ngx_uint_t start; + ngx_uint_t length; + uint32_t timescale; + ngx_http_request_t *request; + ngx_array_t trak; + ngx_http_mp4_trak_t traks[2]; + + size_t ftyp_size; + size_t moov_size; + + ngx_chain_t *out; + ngx_chain_t ftyp_atom; + ngx_chain_t moov_atom; + ngx_chain_t mvhd_atom; + ngx_chain_t mdat_atom; + ngx_chain_t mdat_data; + + ngx_buf_t ftyp_atom_buf; + ngx_buf_t moov_atom_buf; + ngx_buf_t mvhd_atom_buf; + ngx_buf_t mdat_atom_buf; + ngx_buf_t mdat_data_buf; + + u_char moov_atom_header[8]; + u_char mdat_atom_header[16]; +} ngx_http_mp4_file_t; + + +typedef struct { + char *name; + ngx_int_t (*handler)(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +} ngx_http_mp4_atom_handler_t; + + +#define ngx_mp4_atom_header(mp4) (mp4->buffer_pos - 8) +#define ngx_mp4_atom_data(mp4) mp4->buffer_pos +#define ngx_mp4_atom_data_size(t) (uint64_t) (sizeof(t) - 8) + + +#define ngx_mp4_atom_next(mp4, n) \ + mp4->buffer_pos += (size_t) n; \ + mp4->offset += n + + +#define ngx_mp4_set_atom_name(p, n1, n2, n3, n4) \ + ((u_char *) (p))[4] = n1; \ + ((u_char *) (p))[5] = n2; \ + ((u_char *) (p))[6] = n3; \ + ((u_char *) (p))[7] = n4 + +#define ngx_mp4_get_32value(p) \ + ( ((uint32_t) ((u_char *) (p))[0] << 24) \ + + ( ((u_char *) (p))[1] << 16) \ + + ( ((u_char *) (p))[2] << 8) \ + + ( ((u_char *) (p))[3]) ) + +#define ngx_mp4_set_32value(p, n) \ + ((u_char *) (p))[0] = (u_char) ((n) >> 24); \ + ((u_char *) (p))[1] = (u_char) ((n) >> 16); \ + ((u_char *) (p))[2] = (u_char) ((n) >> 8); \ + ((u_char *) (p))[3] = (u_char) (n) + +#define ngx_mp4_get_64value(p) \ + ( ((uint64_t) ((u_char *) (p))[0] << 56) \ + + ((uint64_t) ((u_char *) (p))[1] << 48) \ + + ((uint64_t) ((u_char *) (p))[2] << 40) \ + + ((uint64_t) ((u_char *) (p))[3] << 32) \ + + ((uint64_t) ((u_char *) (p))[4] << 24) \ + + ( ((u_char *) (p))[5] << 16) \ + + ( ((u_char *) (p))[6] << 8) \ + + ( ((u_char *) (p))[7]) ) + +#define ngx_mp4_set_64value(p, n) \ + ((u_char *) (p))[0] = (u_char) ((uint64_t) (n) >> 56); \ + ((u_char *) (p))[1] = (u_char) ((uint64_t) (n) >> 48); \ + ((u_char *) (p))[2] = (u_char) ((uint64_t) (n) >> 40); \ + ((u_char *) (p))[3] = (u_char) ((uint64_t) (n) >> 32); \ + ((u_char *) (p))[4] = (u_char) ( (n) >> 24); \ + ((u_char *) (p))[5] = (u_char) ( (n) >> 16); \ + ((u_char *) (p))[6] = (u_char) ( (n) >> 8); \ + ((u_char *) (p))[7] = (u_char) (n) + +#define ngx_mp4_last_trak(mp4) \ + &((ngx_http_mp4_trak_t *) mp4->trak.elts)[mp4->trak.nelts - 1] + + +static ngx_int_t ngx_http_mp4_handler(ngx_http_request_t *r); +static ngx_int_t ngx_http_mp4_atofp(u_char *line, size_t n, size_t point); + +static ngx_int_t ngx_http_mp4_process(ngx_http_mp4_file_t *mp4); +static ngx_int_t ngx_http_mp4_read_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_atom_handler_t *atom, uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read(ngx_http_mp4_file_t *mp4, size_t size); +static ngx_int_t ngx_http_mp4_read_ftyp_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_moov_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_mdat_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static size_t ngx_http_mp4_update_mdat_atom(ngx_http_mp4_file_t *mp4, + off_t start_offset, off_t end_offset); +static ngx_int_t ngx_http_mp4_read_mvhd_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_trak_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static void ngx_http_mp4_update_trak_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static ngx_int_t ngx_http_mp4_read_cmov_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_tkhd_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_mdia_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static void ngx_http_mp4_update_mdia_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static ngx_int_t ngx_http_mp4_read_mdhd_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_hdlr_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_minf_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static void ngx_http_mp4_update_minf_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static ngx_int_t ngx_http_mp4_read_dinf_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_vmhd_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_smhd_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_stbl_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static void ngx_http_mp4_update_stbl_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static ngx_int_t ngx_http_mp4_read_stsd_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_read_stts_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_update_stts_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static ngx_int_t ngx_http_mp4_crop_stts_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start); +static ngx_int_t ngx_http_mp4_read_stss_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_update_stss_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static void ngx_http_mp4_crop_stss_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start); +static ngx_int_t ngx_http_mp4_read_ctts_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static void ngx_http_mp4_update_ctts_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static void ngx_http_mp4_crop_ctts_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start); +static ngx_int_t ngx_http_mp4_read_stsc_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_update_stsc_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static ngx_int_t ngx_http_mp4_crop_stsc_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start); +static ngx_int_t ngx_http_mp4_read_stsz_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_update_stsz_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static ngx_int_t ngx_http_mp4_read_stco_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_update_stco_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static void ngx_http_mp4_adjust_stco_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, int32_t adjustment); +static ngx_int_t ngx_http_mp4_read_co64_atom(ngx_http_mp4_file_t *mp4, + uint64_t atom_data_size); +static ngx_int_t ngx_http_mp4_update_co64_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak); +static void ngx_http_mp4_adjust_co64_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, off_t adjustment); + +static char *ngx_http_mp4(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); +static void *ngx_http_mp4_create_conf(ngx_conf_t *cf); +static char *ngx_http_mp4_merge_conf(ngx_conf_t *cf, void *parent, void *child); + + +static ngx_command_t ngx_http_mp4_commands[] = { + + { ngx_string("mp4"), + NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS, + ngx_http_mp4, + 0, + 0, + NULL }, + + { ngx_string("mp4_buffer_size"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_size_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_mp4_conf_t, buffer_size), + NULL }, + + { ngx_string("mp4_max_buffer_size"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_size_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_mp4_conf_t, max_buffer_size), + NULL }, + + ngx_null_command +}; + + +static ngx_http_module_t ngx_http_mp4_module_ctx = { + NULL, /* preconfiguration */ + NULL, /* postconfiguration */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + ngx_http_mp4_create_conf, /* create location configuration */ + ngx_http_mp4_merge_conf /* merge location configuration */ +}; + + +ngx_module_t ngx_http_mp4_module = { + NGX_MODULE_V1, + &ngx_http_mp4_module_ctx, /* module context */ + ngx_http_mp4_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + NULL, /* init master */ + NULL, /* init module */ + NULL, /* init process */ + NULL, /* init thread */ + NULL, /* exit thread */ + NULL, /* exit process */ + NULL, /* exit master */ + NGX_MODULE_V1_PADDING +}; + + +static ngx_http_mp4_atom_handler_t ngx_http_mp4_atoms[] = { + { "ftyp", ngx_http_mp4_read_ftyp_atom }, + { "moov", ngx_http_mp4_read_moov_atom }, + { "mdat", ngx_http_mp4_read_mdat_atom }, + { NULL, NULL } +}; + +static ngx_http_mp4_atom_handler_t ngx_http_mp4_moov_atoms[] = { + { "mvhd", ngx_http_mp4_read_mvhd_atom }, + { "trak", ngx_http_mp4_read_trak_atom }, + { "cmov", ngx_http_mp4_read_cmov_atom }, + { NULL, NULL } +}; + +static ngx_http_mp4_atom_handler_t ngx_http_mp4_trak_atoms[] = { + { "tkhd", ngx_http_mp4_read_tkhd_atom }, + { "mdia", ngx_http_mp4_read_mdia_atom }, + { NULL, NULL } +}; + +static ngx_http_mp4_atom_handler_t ngx_http_mp4_mdia_atoms[] = { + { "mdhd", ngx_http_mp4_read_mdhd_atom }, + { "hdlr", ngx_http_mp4_read_hdlr_atom }, + { "minf", ngx_http_mp4_read_minf_atom }, + { NULL, NULL } +}; + +static ngx_http_mp4_atom_handler_t ngx_http_mp4_minf_atoms[] = { + { "vmhd", ngx_http_mp4_read_vmhd_atom }, + { "smhd", ngx_http_mp4_read_smhd_atom }, + { "dinf", ngx_http_mp4_read_dinf_atom }, + { "stbl", ngx_http_mp4_read_stbl_atom }, + { NULL, NULL } +}; + +static ngx_http_mp4_atom_handler_t ngx_http_mp4_stbl_atoms[] = { + { "stsd", ngx_http_mp4_read_stsd_atom }, + { "stts", ngx_http_mp4_read_stts_atom }, + { "stss", ngx_http_mp4_read_stss_atom }, + { "ctts", ngx_http_mp4_read_ctts_atom }, + { "stsc", ngx_http_mp4_read_stsc_atom }, + { "stsz", ngx_http_mp4_read_stsz_atom }, + { "stco", ngx_http_mp4_read_stco_atom }, + { "co64", ngx_http_mp4_read_co64_atom }, + { NULL, NULL } +}; + + +static ngx_int_t +ngx_http_mp4_handler(ngx_http_request_t *r) +{ + u_char *last; + size_t root; + ngx_int_t rc, start, end; + ngx_uint_t level, length; + ngx_str_t path, value; + ngx_log_t *log; + ngx_buf_t *b; + ngx_chain_t out; + ngx_http_mp4_file_t *mp4; + ngx_open_file_info_t of; + ngx_http_core_loc_conf_t *clcf; + + if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) { + return NGX_HTTP_NOT_ALLOWED; + } + + if (r->uri.data[r->uri.len - 1] == '/') { + return NGX_DECLINED; + } + + rc = ngx_http_discard_request_body(r); + + if (rc != NGX_OK) { + return rc; + } + + last = ngx_http_map_uri_to_path(r, &path, &root, 0); + if (last == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + log = r->connection->log; + + path.len = last - path.data; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0, + "http mp4 filename: \"%V\"", &path); + + clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); + + ngx_memzero(&of, sizeof(ngx_open_file_info_t)); + + of.read_ahead = clcf->read_ahead; + of.directio = NGX_MAX_OFF_T_VALUE; + of.valid = clcf->open_file_cache_valid; + of.min_uses = clcf->open_file_cache_min_uses; + of.errors = clcf->open_file_cache_errors; + of.events = clcf->open_file_cache_events; + + if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool) + != NGX_OK) + { + switch (of.err) { + + case 0: + return NGX_HTTP_INTERNAL_SERVER_ERROR; + + case NGX_ENOENT: + case NGX_ENOTDIR: + case NGX_ENAMETOOLONG: + + level = NGX_LOG_ERR; + rc = NGX_HTTP_NOT_FOUND; + break; + + case NGX_EACCES: +#if (NGX_HAVE_OPENAT) + case NGX_EMLINK: + case NGX_ELOOP: +#endif + + level = NGX_LOG_ERR; + rc = NGX_HTTP_FORBIDDEN; + break; + + default: + + level = NGX_LOG_CRIT; + rc = NGX_HTTP_INTERNAL_SERVER_ERROR; + break; + } + + if (rc != NGX_HTTP_NOT_FOUND || clcf->log_not_found) { + ngx_log_error(level, log, of.err, + "%s \"%s\" failed", of.failed, path.data); + } + + return rc; + } + + if (!of.is_file) { + + if (ngx_close_file(of.fd) == NGX_FILE_ERROR) { + ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, + ngx_close_file_n " \"%s\" failed", path.data); + } + + return NGX_DECLINED; + } + + r->root_tested = !r->error_page; + r->allow_ranges = 1; + + start = -1; + length = 0; + r->headers_out.content_length_n = of.size; + mp4 = NULL; + b = NULL; + + if (r->args.len) { + + if (ngx_http_arg(r, (u_char *) "start", 5, &value) == NGX_OK) { + + /* + * A Flash player may send start value with a lot of digits + * after dot so a custom function is used instead of ngx_atofp(). + */ + + start = ngx_http_mp4_atofp(value.data, value.len, 3); + } + + if (ngx_http_arg(r, (u_char *) "end", 3, &value) == NGX_OK) { + + end = ngx_http_mp4_atofp(value.data, value.len, 3); + + if (end > 0) { + if (start < 0) { + start = 0; + } + + if (end > start) { + length = end - start; + } + } + } + } + + if (start >= 0) { + r->single_range = 1; + + mp4 = ngx_pcalloc(r->pool, sizeof(ngx_http_mp4_file_t)); + if (mp4 == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + mp4->file.fd = of.fd; + mp4->file.name = path; + mp4->file.log = r->connection->log; + mp4->end = of.size; + mp4->start = (ngx_uint_t) start; + mp4->length = length; + mp4->request = r; + + switch (ngx_http_mp4_process(mp4)) { + + case NGX_DECLINED: + if (mp4->buffer) { + ngx_pfree(r->pool, mp4->buffer); + } + + ngx_pfree(r->pool, mp4); + mp4 = NULL; + + break; + + case NGX_OK: + r->headers_out.content_length_n = mp4->content_length; + break; + + default: /* NGX_ERROR */ + if (mp4->buffer) { + ngx_pfree(r->pool, mp4->buffer); + } + + ngx_pfree(r->pool, mp4); + + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + } + + log->action = "sending mp4 to client"; + + if (clcf->directio <= of.size) { + + /* + * DIRECTIO is set on transfer only + * to allow kernel to cache "moov" atom + */ + + if (ngx_directio_on(of.fd) == NGX_FILE_ERROR) { + ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, + ngx_directio_on_n " \"%s\" failed", path.data); + } + + of.is_directio = 1; + + if (mp4) { + mp4->file.directio = 1; + } + } + + r->headers_out.status = NGX_HTTP_OK; + r->headers_out.last_modified_time = of.mtime; + + if (ngx_http_set_etag(r) != NGX_OK) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (ngx_http_set_content_type(r) != NGX_OK) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (mp4 == NULL) { + b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); + if (b == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t)); + if (b->file == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + } + + rc = ngx_http_send_header(r); + + if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { + return rc; + } + + if (mp4) { + return ngx_http_output_filter(r, mp4->out); + } + + b->file_pos = 0; + b->file_last = of.size; + + b->in_file = b->file_last ? 1 : 0; + b->last_buf = (r == r->main) ? 1 : 0; + b->last_in_chain = 1; + + b->file->fd = of.fd; + b->file->name = path; + b->file->log = log; + b->file->directio = of.is_directio; + + out.buf = b; + out.next = NULL; + + return ngx_http_output_filter(r, &out); +} + + +static ngx_int_t +ngx_http_mp4_atofp(u_char *line, size_t n, size_t point) +{ + ngx_int_t value, cutoff, cutlim; + ngx_uint_t dot; + + /* same as ngx_atofp(), but allows additional digits */ + + if (n == 0) { + return NGX_ERROR; + } + + cutoff = NGX_MAX_INT_T_VALUE / 10; + cutlim = NGX_MAX_INT_T_VALUE % 10; + + dot = 0; + + for (value = 0; n--; line++) { + + if (*line == '.') { + if (dot) { + return NGX_ERROR; + } + + dot = 1; + continue; + } + + if (*line < '0' || *line > '9') { + return NGX_ERROR; + } + + if (point == 0) { + continue; + } + + if (value >= cutoff && (value > cutoff || *line - '0' > cutlim)) { + return NGX_ERROR; + } + + value = value * 10 + (*line - '0'); + point -= dot; + } + + while (point--) { + if (value > cutoff) { + return NGX_ERROR; + } + + value = value * 10; + } + + return value; +} + + +static ngx_int_t +ngx_http_mp4_process(ngx_http_mp4_file_t *mp4) +{ + off_t start_offset, end_offset, adjustment; + ngx_int_t rc; + ngx_uint_t i, j; + ngx_chain_t **prev; + ngx_http_mp4_trak_t *trak; + ngx_http_mp4_conf_t *conf; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 start:%ui, length:%ui", mp4->start, mp4->length); + + conf = ngx_http_get_module_loc_conf(mp4->request, ngx_http_mp4_module); + + mp4->buffer_size = conf->buffer_size; + + rc = ngx_http_mp4_read_atom(mp4, ngx_http_mp4_atoms, mp4->end); + if (rc != NGX_OK) { + return rc; + } + + if (mp4->trak.nelts == 0) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "no mp4 trak atoms were found in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + if (mp4->mdat_atom.buf == NULL) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "no mp4 mdat atom was found in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + prev = &mp4->out; + + if (mp4->ftyp_atom.buf) { + *prev = &mp4->ftyp_atom; + prev = &mp4->ftyp_atom.next; + } + + *prev = &mp4->moov_atom; + prev = &mp4->moov_atom.next; + + if (mp4->mvhd_atom.buf) { + mp4->moov_size += mp4->mvhd_atom_buf.last - mp4->mvhd_atom_buf.pos; + *prev = &mp4->mvhd_atom; + prev = &mp4->mvhd_atom.next; + } + + start_offset = mp4->end; + end_offset = 0; + trak = mp4->trak.elts; + + for (i = 0; i < mp4->trak.nelts; i++) { + + if (ngx_http_mp4_update_stts_atom(mp4, &trak[i]) != NGX_OK) { + return NGX_ERROR; + } + + if (ngx_http_mp4_update_stss_atom(mp4, &trak[i]) != NGX_OK) { + return NGX_ERROR; + } + + ngx_http_mp4_update_ctts_atom(mp4, &trak[i]); + + if (ngx_http_mp4_update_stsc_atom(mp4, &trak[i]) != NGX_OK) { + return NGX_ERROR; + } + + if (ngx_http_mp4_update_stsz_atom(mp4, &trak[i]) != NGX_OK) { + return NGX_ERROR; + } + + if (trak[i].out[NGX_HTTP_MP4_CO64_DATA].buf) { + if (ngx_http_mp4_update_co64_atom(mp4, &trak[i]) != NGX_OK) { + return NGX_ERROR; + } + + } else { + if (ngx_http_mp4_update_stco_atom(mp4, &trak[i]) != NGX_OK) { + return NGX_ERROR; + } + } + + ngx_http_mp4_update_stbl_atom(mp4, &trak[i]); + ngx_http_mp4_update_minf_atom(mp4, &trak[i]); + trak[i].size += trak[i].mdhd_size; + trak[i].size += trak[i].hdlr_size; + ngx_http_mp4_update_mdia_atom(mp4, &trak[i]); + trak[i].size += trak[i].tkhd_size; + ngx_http_mp4_update_trak_atom(mp4, &trak[i]); + + mp4->moov_size += trak[i].size; + + if (start_offset > trak[i].start_offset) { + start_offset = trak[i].start_offset; + } + + if (end_offset < trak[i].end_offset) { + end_offset = trak[i].end_offset; + } + + *prev = &trak[i].out[NGX_HTTP_MP4_TRAK_ATOM]; + prev = &trak[i].out[NGX_HTTP_MP4_TRAK_ATOM].next; + + for (j = 0; j < NGX_HTTP_MP4_LAST_ATOM + 1; j++) { + if (trak[i].out[j].buf) { + *prev = &trak[i].out[j]; + prev = &trak[i].out[j].next; + } + } + } + + if (end_offset < start_offset) { + end_offset = start_offset; + } + + mp4->moov_size += 8; + + ngx_mp4_set_32value(mp4->moov_atom_header, mp4->moov_size); + ngx_mp4_set_atom_name(mp4->moov_atom_header, 'm', 'o', 'o', 'v'); + mp4->content_length += mp4->moov_size; + + *prev = &mp4->mdat_atom; + + if (start_offset > mp4->mdat_data.buf->file_last) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 mdat atom in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + adjustment = mp4->ftyp_size + mp4->moov_size + + ngx_http_mp4_update_mdat_atom(mp4, start_offset, end_offset) + - start_offset; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 adjustment:%O", adjustment); + + for (i = 0; i < mp4->trak.nelts; i++) { + if (trak[i].out[NGX_HTTP_MP4_CO64_DATA].buf) { + ngx_http_mp4_adjust_co64_atom(mp4, &trak[i], adjustment); + } else { + ngx_http_mp4_adjust_stco_atom(mp4, &trak[i], (int32_t) adjustment); + } + } + + return NGX_OK; +} + + +typedef struct { + u_char size[4]; + u_char name[4]; +} ngx_mp4_atom_header_t; + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char size64[8]; +} ngx_mp4_atom_header64_t; + + +static ngx_int_t +ngx_http_mp4_read_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_atom_handler_t *atom, uint64_t atom_data_size) +{ + off_t end; + size_t atom_header_size; + u_char *atom_header, *atom_name; + uint64_t atom_size; + ngx_int_t rc; + ngx_uint_t n; + + end = mp4->offset + atom_data_size; + + while (mp4->offset < end) { + + if (ngx_http_mp4_read(mp4, sizeof(uint32_t)) != NGX_OK) { + return NGX_ERROR; + } + + atom_header = mp4->buffer_pos; + atom_size = ngx_mp4_get_32value(atom_header); + atom_header_size = sizeof(ngx_mp4_atom_header_t); + + if (atom_size == 0) { + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 atom end"); + return NGX_OK; + } + + if (atom_size < sizeof(ngx_mp4_atom_header_t)) { + + if (atom_size == 1) { + + if (ngx_http_mp4_read(mp4, sizeof(ngx_mp4_atom_header64_t)) + != NGX_OK) + { + return NGX_ERROR; + } + + /* 64-bit atom size */ + atom_header = mp4->buffer_pos; + atom_size = ngx_mp4_get_64value(atom_header + 8); + atom_header_size = sizeof(ngx_mp4_atom_header64_t); + + } else { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 atom is too small:%uL", + mp4->file.name.data, atom_size); + return NGX_ERROR; + } + } + + if (ngx_http_mp4_read(mp4, sizeof(ngx_mp4_atom_header_t)) != NGX_OK) { + return NGX_ERROR; + } + + atom_header = mp4->buffer_pos; + atom_name = atom_header + sizeof(uint32_t); + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 atom: %*s @%O:%uL", + (size_t) 4, atom_name, mp4->offset, atom_size); + + if (atom_size > (uint64_t) (NGX_MAX_OFF_T_VALUE - mp4->offset) + || mp4->offset + (off_t) atom_size > end) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 atom too large:%uL", + mp4->file.name.data, atom_size); + return NGX_ERROR; + } + + for (n = 0; atom[n].name; n++) { + + if (ngx_strncmp(atom_name, atom[n].name, 4) == 0) { + + ngx_mp4_atom_next(mp4, atom_header_size); + + rc = atom[n].handler(mp4, atom_size - atom_header_size); + if (rc != NGX_OK) { + return rc; + } + + goto next; + } + } + + ngx_mp4_atom_next(mp4, atom_size); + + next: + continue; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read(ngx_http_mp4_file_t *mp4, size_t size) +{ + ssize_t n; + + if (mp4->buffer_pos + size <= mp4->buffer_end) { + return NGX_OK; + } + + if (mp4->offset + (off_t) mp4->buffer_size > mp4->end) { + mp4->buffer_size = (size_t) (mp4->end - mp4->offset); + } + + if (mp4->buffer_size < size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 file truncated", mp4->file.name.data); + return NGX_ERROR; + } + + if (mp4->buffer == NULL) { + mp4->buffer = ngx_palloc(mp4->request->pool, mp4->buffer_size); + if (mp4->buffer == NULL) { + return NGX_ERROR; + } + + mp4->buffer_start = mp4->buffer; + } + + n = ngx_read_file(&mp4->file, mp4->buffer_start, mp4->buffer_size, + mp4->offset); + + if (n == NGX_ERROR) { + return NGX_ERROR; + } + + if ((size_t) n != mp4->buffer_size) { + ngx_log_error(NGX_LOG_CRIT, mp4->file.log, 0, + ngx_read_file_n " read only %z of %z from \"%s\"", + n, mp4->buffer_size, mp4->file.name.data); + return NGX_ERROR; + } + + mp4->buffer_pos = mp4->buffer_start; + mp4->buffer_end = mp4->buffer_start + mp4->buffer_size; + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_ftyp_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *ftyp_atom; + size_t atom_size; + ngx_buf_t *atom; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 ftyp atom"); + + if (atom_data_size > 1024 + || ngx_mp4_atom_data(mp4) + (size_t) atom_data_size > mp4->buffer_end) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 ftyp atom is too large:%uL", + mp4->file.name.data, atom_data_size); + return NGX_ERROR; + } + + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + + ftyp_atom = ngx_palloc(mp4->request->pool, atom_size); + if (ftyp_atom == NULL) { + return NGX_ERROR; + } + + ngx_mp4_set_32value(ftyp_atom, atom_size); + ngx_mp4_set_atom_name(ftyp_atom, 'f', 't', 'y', 'p'); + + /* + * only moov atom content is guaranteed to be in mp4->buffer + * during sending response, so ftyp atom content should be copied + */ + ngx_memcpy(ftyp_atom + sizeof(ngx_mp4_atom_header_t), + ngx_mp4_atom_data(mp4), (size_t) atom_data_size); + + atom = &mp4->ftyp_atom_buf; + atom->temporary = 1; + atom->pos = ftyp_atom; + atom->last = ftyp_atom + atom_size; + + mp4->ftyp_atom.buf = atom; + mp4->ftyp_size = atom_size; + mp4->content_length = atom_size; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +/* + * Small excess buffer to process atoms after moov atom, mp4->buffer_start + * will be set to this buffer part after moov atom processing. + */ +#define NGX_HTTP_MP4_MOOV_BUFFER_EXCESS (4 * 1024) + +static ngx_int_t +ngx_http_mp4_read_moov_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + ngx_int_t rc; + ngx_uint_t no_mdat; + ngx_buf_t *atom; + ngx_http_mp4_conf_t *conf; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 moov atom"); + + no_mdat = (mp4->mdat_atom.buf == NULL); + + if (no_mdat && mp4->start == 0 && mp4->length == 0) { + /* + * send original file if moov atom resides before + * mdat atom and client requests integral file + */ + return NGX_DECLINED; + } + + conf = ngx_http_get_module_loc_conf(mp4->request, ngx_http_mp4_module); + + if (atom_data_size > mp4->buffer_size) { + + if (atom_data_size > conf->max_buffer_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 moov atom is too large:%uL, " + "you may want to increase mp4_max_buffer_size", + mp4->file.name.data, atom_data_size); + return NGX_ERROR; + } + + ngx_pfree(mp4->request->pool, mp4->buffer); + mp4->buffer = NULL; + mp4->buffer_pos = NULL; + mp4->buffer_end = NULL; + + mp4->buffer_size = (size_t) atom_data_size + + NGX_HTTP_MP4_MOOV_BUFFER_EXCESS * no_mdat; + } + + if (ngx_http_mp4_read(mp4, (size_t) atom_data_size) != NGX_OK) { + return NGX_ERROR; + } + + mp4->trak.elts = &mp4->traks; + mp4->trak.size = sizeof(ngx_http_mp4_trak_t); + mp4->trak.nalloc = 2; + mp4->trak.pool = mp4->request->pool; + + atom = &mp4->moov_atom_buf; + atom->temporary = 1; + atom->pos = mp4->moov_atom_header; + atom->last = mp4->moov_atom_header + 8; + + mp4->moov_atom.buf = &mp4->moov_atom_buf; + + rc = ngx_http_mp4_read_atom(mp4, ngx_http_mp4_moov_atoms, atom_data_size); + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 moov atom done"); + + if (no_mdat) { + mp4->buffer_start = mp4->buffer_pos; + mp4->buffer_size = NGX_HTTP_MP4_MOOV_BUFFER_EXCESS; + + if (mp4->buffer_start + mp4->buffer_size > mp4->buffer_end) { + mp4->buffer = NULL; + mp4->buffer_pos = NULL; + mp4->buffer_end = NULL; + } + + } else { + /* skip atoms after moov atom */ + mp4->offset = mp4->end; + } + + return rc; +} + + +static ngx_int_t +ngx_http_mp4_read_mdat_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + ngx_buf_t *data; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 mdat atom"); + + data = &mp4->mdat_data_buf; + data->file = &mp4->file; + data->in_file = 1; + data->last_buf = (mp4->request == mp4->request->main) ? 1 : 0; + data->last_in_chain = 1; + data->file_last = mp4->offset + atom_data_size; + + mp4->mdat_atom.buf = &mp4->mdat_atom_buf; + mp4->mdat_atom.next = &mp4->mdat_data; + mp4->mdat_data.buf = data; + + if (mp4->trak.nelts) { + /* skip atoms after mdat atom */ + mp4->offset = mp4->end; + + } else { + ngx_mp4_atom_next(mp4, atom_data_size); + } + + return NGX_OK; +} + + +static size_t +ngx_http_mp4_update_mdat_atom(ngx_http_mp4_file_t *mp4, off_t start_offset, + off_t end_offset) +{ + off_t atom_data_size; + u_char *atom_header; + uint32_t atom_header_size; + uint64_t atom_size; + ngx_buf_t *atom; + + atom_data_size = end_offset - start_offset; + mp4->mdat_data.buf->file_pos = start_offset; + mp4->mdat_data.buf->file_last = end_offset; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mdat new offset @%O:%O", start_offset, atom_data_size); + + atom_header = mp4->mdat_atom_header; + + if ((uint64_t) atom_data_size + > (uint64_t) 0xffffffff - sizeof(ngx_mp4_atom_header_t)) + { + atom_size = 1; + atom_header_size = sizeof(ngx_mp4_atom_header64_t); + ngx_mp4_set_64value(atom_header + sizeof(ngx_mp4_atom_header_t), + sizeof(ngx_mp4_atom_header64_t) + atom_data_size); + } else { + atom_size = sizeof(ngx_mp4_atom_header_t) + atom_data_size; + atom_header_size = sizeof(ngx_mp4_atom_header_t); + } + + mp4->content_length += atom_header_size + atom_data_size; + + ngx_mp4_set_32value(atom_header, atom_size); + ngx_mp4_set_atom_name(atom_header, 'm', 'd', 'a', 't'); + + atom = &mp4->mdat_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_header_size; + + return atom_header_size; +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char creation_time[4]; + u_char modification_time[4]; + u_char timescale[4]; + u_char duration[4]; + u_char rate[4]; + u_char volume[2]; + u_char reserved[10]; + u_char matrix[36]; + u_char preview_time[4]; + u_char preview_duration[4]; + u_char poster_time[4]; + u_char selection_time[4]; + u_char selection_duration[4]; + u_char current_time[4]; + u_char next_track_id[4]; +} ngx_mp4_mvhd_atom_t; + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char creation_time[8]; + u_char modification_time[8]; + u_char timescale[4]; + u_char duration[8]; + u_char rate[4]; + u_char volume[2]; + u_char reserved[10]; + u_char matrix[36]; + u_char preview_time[4]; + u_char preview_duration[4]; + u_char poster_time[4]; + u_char selection_time[4]; + u_char selection_duration[4]; + u_char current_time[4]; + u_char next_track_id[4]; +} ngx_mp4_mvhd64_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_mvhd_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + size_t atom_size; + uint32_t timescale; + uint64_t duration, start_time, length_time; + ngx_buf_t *atom; + ngx_mp4_mvhd_atom_t *mvhd_atom; + ngx_mp4_mvhd64_atom_t *mvhd64_atom; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 mvhd atom"); + + atom_header = ngx_mp4_atom_header(mp4); + mvhd_atom = (ngx_mp4_mvhd_atom_t *) atom_header; + mvhd64_atom = (ngx_mp4_mvhd64_atom_t *) atom_header; + ngx_mp4_set_atom_name(atom_header, 'm', 'v', 'h', 'd'); + + if (ngx_mp4_atom_data_size(ngx_mp4_mvhd_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 mvhd atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + if (mvhd_atom->version[0] == 0) { + /* version 0: 32-bit duration */ + timescale = ngx_mp4_get_32value(mvhd_atom->timescale); + duration = ngx_mp4_get_32value(mvhd_atom->duration); + + } else { + /* version 1: 64-bit duration */ + + if (ngx_mp4_atom_data_size(ngx_mp4_mvhd64_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 mvhd atom too small", + mp4->file.name.data); + return NGX_ERROR; + } + + timescale = ngx_mp4_get_32value(mvhd64_atom->timescale); + duration = ngx_mp4_get_64value(mvhd64_atom->duration); + } + + mp4->timescale = timescale; + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mvhd timescale:%uD, duration:%uL, time:%.3fs", + timescale, duration, (double) duration / timescale); + + start_time = (uint64_t) mp4->start * timescale / 1000; + + if (duration < start_time) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 start time exceeds file duration", + mp4->file.name.data); + return NGX_ERROR; + } + + duration -= start_time; + + if (mp4->length) { + length_time = (uint64_t) mp4->length * timescale / 1000; + + if (duration > length_time) { + duration = length_time; + } + } + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mvhd new duration:%uL, time:%.3fs", + duration, (double) duration / timescale); + + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + ngx_mp4_set_32value(mvhd_atom->size, atom_size); + + if (mvhd_atom->version[0] == 0) { + ngx_mp4_set_32value(mvhd_atom->duration, duration); + + } else { + ngx_mp4_set_64value(mvhd64_atom->duration, duration); + } + + atom = &mp4->mvhd_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_size; + + mp4->mvhd_atom.buf = atom; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_trak_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_end; + off_t atom_file_end; + ngx_int_t rc; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 trak atom"); + + trak = ngx_array_push(&mp4->trak); + if (trak == NULL) { + return NGX_ERROR; + } + + ngx_memzero(trak, sizeof(ngx_http_mp4_trak_t)); + + atom_header = ngx_mp4_atom_header(mp4); + ngx_mp4_set_atom_name(atom_header, 't', 'r', 'a', 'k'); + + atom = &trak->trak_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + sizeof(ngx_mp4_atom_header_t); + + trak->out[NGX_HTTP_MP4_TRAK_ATOM].buf = atom; + + atom_end = mp4->buffer_pos + (size_t) atom_data_size; + atom_file_end = mp4->offset + atom_data_size; + + rc = ngx_http_mp4_read_atom(mp4, ngx_http_mp4_trak_atoms, atom_data_size); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 trak atom: %i", rc); + + if (rc == NGX_DECLINED) { + /* skip this trak */ + ngx_memzero(trak, sizeof(ngx_http_mp4_trak_t)); + mp4->trak.nelts--; + mp4->buffer_pos = atom_end; + mp4->offset = atom_file_end; + return NGX_OK; + } + + return rc; +} + + +static void +ngx_http_mp4_update_trak_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + ngx_buf_t *atom; + + trak->size += sizeof(ngx_mp4_atom_header_t); + atom = &trak->trak_atom_buf; + ngx_mp4_set_32value(atom->pos, trak->size); +} + + +static ngx_int_t +ngx_http_mp4_read_cmov_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 compressed moov atom (cmov) is not supported", + mp4->file.name.data); + + return NGX_ERROR; +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char creation_time[4]; + u_char modification_time[4]; + u_char track_id[4]; + u_char reserved1[4]; + u_char duration[4]; + u_char reserved2[8]; + u_char layer[2]; + u_char group[2]; + u_char volume[2]; + u_char reserved3[2]; + u_char matrix[36]; + u_char width[4]; + u_char height[4]; +} ngx_mp4_tkhd_atom_t; + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char creation_time[8]; + u_char modification_time[8]; + u_char track_id[4]; + u_char reserved1[4]; + u_char duration[8]; + u_char reserved2[8]; + u_char layer[2]; + u_char group[2]; + u_char volume[2]; + u_char reserved3[2]; + u_char matrix[36]; + u_char width[4]; + u_char height[4]; +} ngx_mp4_tkhd64_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_tkhd_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + size_t atom_size; + uint64_t duration, start_time, length_time; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + ngx_mp4_tkhd_atom_t *tkhd_atom; + ngx_mp4_tkhd64_atom_t *tkhd64_atom; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 tkhd atom"); + + atom_header = ngx_mp4_atom_header(mp4); + tkhd_atom = (ngx_mp4_tkhd_atom_t *) atom_header; + tkhd64_atom = (ngx_mp4_tkhd64_atom_t *) atom_header; + ngx_mp4_set_atom_name(tkhd_atom, 't', 'k', 'h', 'd'); + + if (ngx_mp4_atom_data_size(ngx_mp4_tkhd_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 tkhd atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + if (tkhd_atom->version[0] == 0) { + /* version 0: 32-bit duration */ + duration = ngx_mp4_get_32value(tkhd_atom->duration); + + } else { + /* version 1: 64-bit duration */ + + if (ngx_mp4_atom_data_size(ngx_mp4_tkhd64_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 tkhd atom too small", + mp4->file.name.data); + return NGX_ERROR; + } + + duration = ngx_mp4_get_64value(tkhd64_atom->duration); + } + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "tkhd duration:%uL, time:%.3fs", + duration, (double) duration / mp4->timescale); + + start_time = (uint64_t) mp4->start * mp4->timescale / 1000; + + if (duration <= start_time) { + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "tkhd duration is less than start time"); + return NGX_DECLINED; + } + + duration -= start_time; + + if (mp4->length) { + length_time = (uint64_t) mp4->length * mp4->timescale / 1000; + + if (duration > length_time) { + duration = length_time; + } + } + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "tkhd new duration:%uL, time:%.3fs", + duration, (double) duration / mp4->timescale); + + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + + trak = ngx_mp4_last_trak(mp4); + trak->tkhd_size = atom_size; + + ngx_mp4_set_32value(tkhd_atom->size, atom_size); + + if (tkhd_atom->version[0] == 0) { + ngx_mp4_set_32value(tkhd_atom->duration, duration); + + } else { + ngx_mp4_set_64value(tkhd64_atom->duration, duration); + } + + atom = &trak->tkhd_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_size; + + trak->out[NGX_HTTP_MP4_TKHD_ATOM].buf = atom; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_mdia_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "process mdia atom"); + + atom_header = ngx_mp4_atom_header(mp4); + ngx_mp4_set_atom_name(atom_header, 'm', 'd', 'i', 'a'); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->mdia_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + sizeof(ngx_mp4_atom_header_t); + + trak->out[NGX_HTTP_MP4_MDIA_ATOM].buf = atom; + + return ngx_http_mp4_read_atom(mp4, ngx_http_mp4_mdia_atoms, atom_data_size); +} + + +static void +ngx_http_mp4_update_mdia_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + ngx_buf_t *atom; + + trak->size += sizeof(ngx_mp4_atom_header_t); + atom = &trak->mdia_atom_buf; + ngx_mp4_set_32value(atom->pos, trak->size); +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char creation_time[4]; + u_char modification_time[4]; + u_char timescale[4]; + u_char duration[4]; + u_char language[2]; + u_char quality[2]; +} ngx_mp4_mdhd_atom_t; + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char creation_time[8]; + u_char modification_time[8]; + u_char timescale[4]; + u_char duration[8]; + u_char language[2]; + u_char quality[2]; +} ngx_mp4_mdhd64_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_mdhd_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + size_t atom_size; + uint32_t timescale; + uint64_t duration, start_time, length_time; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + ngx_mp4_mdhd_atom_t *mdhd_atom; + ngx_mp4_mdhd64_atom_t *mdhd64_atom; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 mdhd atom"); + + atom_header = ngx_mp4_atom_header(mp4); + mdhd_atom = (ngx_mp4_mdhd_atom_t *) atom_header; + mdhd64_atom = (ngx_mp4_mdhd64_atom_t *) atom_header; + ngx_mp4_set_atom_name(mdhd_atom, 'm', 'd', 'h', 'd'); + + if (ngx_mp4_atom_data_size(ngx_mp4_mdhd_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 mdhd atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + if (mdhd_atom->version[0] == 0) { + /* version 0: everything is 32-bit */ + timescale = ngx_mp4_get_32value(mdhd_atom->timescale); + duration = ngx_mp4_get_32value(mdhd_atom->duration); + + } else { + /* version 1: 64-bit duration and 32-bit timescale */ + + if (ngx_mp4_atom_data_size(ngx_mp4_mdhd64_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 mdhd atom too small", + mp4->file.name.data); + return NGX_ERROR; + } + + timescale = ngx_mp4_get_32value(mdhd64_atom->timescale); + duration = ngx_mp4_get_64value(mdhd64_atom->duration); + } + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mdhd timescale:%uD, duration:%uL, time:%.3fs", + timescale, duration, (double) duration / timescale); + + start_time = (uint64_t) mp4->start * timescale / 1000; + + if (duration <= start_time) { + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mdhd duration is less than start time"); + return NGX_DECLINED; + } + + duration -= start_time; + + if (mp4->length) { + length_time = (uint64_t) mp4->length * timescale / 1000; + + if (duration > length_time) { + duration = length_time; + } + } + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mdhd new duration:%uL, time:%.3fs", + duration, (double) duration / timescale); + + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + + trak = ngx_mp4_last_trak(mp4); + trak->mdhd_size = atom_size; + trak->timescale = timescale; + + ngx_mp4_set_32value(mdhd_atom->size, atom_size); + + if (mdhd_atom->version[0] == 0) { + ngx_mp4_set_32value(mdhd_atom->duration, duration); + + } else { + ngx_mp4_set_64value(mdhd64_atom->duration, duration); + } + + atom = &trak->mdhd_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_size; + + trak->out[NGX_HTTP_MP4_MDHD_ATOM].buf = atom; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_hdlr_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + size_t atom_size; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 hdlr atom"); + + atom_header = ngx_mp4_atom_header(mp4); + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + ngx_mp4_set_32value(atom_header, atom_size); + ngx_mp4_set_atom_name(atom_header, 'h', 'd', 'l', 'r'); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->hdlr_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_size; + + trak->hdlr_size = atom_size; + trak->out[NGX_HTTP_MP4_HDLR_ATOM].buf = atom; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_minf_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "process minf atom"); + + atom_header = ngx_mp4_atom_header(mp4); + ngx_mp4_set_atom_name(atom_header, 'm', 'i', 'n', 'f'); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->minf_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + sizeof(ngx_mp4_atom_header_t); + + trak->out[NGX_HTTP_MP4_MINF_ATOM].buf = atom; + + return ngx_http_mp4_read_atom(mp4, ngx_http_mp4_minf_atoms, atom_data_size); +} + + +static void +ngx_http_mp4_update_minf_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + ngx_buf_t *atom; + + trak->size += sizeof(ngx_mp4_atom_header_t) + + trak->vmhd_size + + trak->smhd_size + + trak->dinf_size; + atom = &trak->minf_atom_buf; + ngx_mp4_set_32value(atom->pos, trak->size); +} + + +static ngx_int_t +ngx_http_mp4_read_vmhd_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + size_t atom_size; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 vmhd atom"); + + atom_header = ngx_mp4_atom_header(mp4); + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + ngx_mp4_set_32value(atom_header, atom_size); + ngx_mp4_set_atom_name(atom_header, 'v', 'm', 'h', 'd'); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->vmhd_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_size; + + trak->vmhd_size += atom_size; + trak->out[NGX_HTTP_MP4_VMHD_ATOM].buf = atom; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_smhd_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + size_t atom_size; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 smhd atom"); + + atom_header = ngx_mp4_atom_header(mp4); + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + ngx_mp4_set_32value(atom_header, atom_size); + ngx_mp4_set_atom_name(atom_header, 's', 'm', 'h', 'd'); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->smhd_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_size; + + trak->smhd_size += atom_size; + trak->out[NGX_HTTP_MP4_SMHD_ATOM].buf = atom; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_dinf_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + size_t atom_size; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 dinf atom"); + + atom_header = ngx_mp4_atom_header(mp4); + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + ngx_mp4_set_32value(atom_header, atom_size); + ngx_mp4_set_atom_name(atom_header, 'd', 'i', 'n', 'f'); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->dinf_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + atom_size; + + trak->dinf_size += atom_size; + trak->out[NGX_HTTP_MP4_DINF_ATOM].buf = atom; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_read_stbl_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header; + ngx_buf_t *atom; + ngx_http_mp4_trak_t *trak; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "process stbl atom"); + + atom_header = ngx_mp4_atom_header(mp4); + ngx_mp4_set_atom_name(atom_header, 's', 't', 'b', 'l'); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->stbl_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_header + sizeof(ngx_mp4_atom_header_t); + + trak->out[NGX_HTTP_MP4_STBL_ATOM].buf = atom; + + return ngx_http_mp4_read_atom(mp4, ngx_http_mp4_stbl_atoms, atom_data_size); +} + + +static void +ngx_http_mp4_update_stbl_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + ngx_buf_t *atom; + + trak->size += sizeof(ngx_mp4_atom_header_t); + atom = &trak->stbl_atom_buf; + ngx_mp4_set_32value(atom->pos, trak->size); +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char entries[4]; + + u_char media_size[4]; + u_char media_name[4]; +} ngx_mp4_stsd_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_stsd_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table; + size_t atom_size; + ngx_buf_t *atom; + ngx_mp4_stsd_atom_t *stsd_atom; + ngx_http_mp4_trak_t *trak; + + /* sample description atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 stsd atom"); + + atom_header = ngx_mp4_atom_header(mp4); + stsd_atom = (ngx_mp4_stsd_atom_t *) atom_header; + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + atom_table = atom_header + atom_size; + ngx_mp4_set_32value(stsd_atom->size, atom_size); + ngx_mp4_set_atom_name(stsd_atom, 's', 't', 's', 'd'); + + if (ngx_mp4_atom_data_size(ngx_mp4_stsd_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stsd atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "stsd entries:%uD, media:%*s", + ngx_mp4_get_32value(stsd_atom->entries), + (size_t) 4, stsd_atom->media_name); + + trak = ngx_mp4_last_trak(mp4); + + atom = &trak->stsd_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + trak->out[NGX_HTTP_MP4_STSD_ATOM].buf = atom; + trak->size += atom_size; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char entries[4]; +} ngx_mp4_stts_atom_t; + +typedef struct { + u_char count[4]; + u_char duration[4]; +} ngx_mp4_stts_entry_t; + + +static ngx_int_t +ngx_http_mp4_read_stts_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table, *atom_end; + uint32_t entries; + ngx_buf_t *atom, *data; + ngx_mp4_stts_atom_t *stts_atom; + ngx_http_mp4_trak_t *trak; + + /* time-to-sample atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 stts atom"); + + atom_header = ngx_mp4_atom_header(mp4); + stts_atom = (ngx_mp4_stts_atom_t *) atom_header; + ngx_mp4_set_atom_name(stts_atom, 's', 't', 't', 's'); + + if (ngx_mp4_atom_data_size(ngx_mp4_stts_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stts atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + entries = ngx_mp4_get_32value(stts_atom->entries); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 time-to-sample entries:%uD", entries); + + if (ngx_mp4_atom_data_size(ngx_mp4_stts_atom_t) + + entries * sizeof(ngx_mp4_stts_entry_t) > atom_data_size) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stts atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + atom_table = atom_header + sizeof(ngx_mp4_stts_atom_t); + atom_end = atom_table + entries * sizeof(ngx_mp4_stts_entry_t); + + trak = ngx_mp4_last_trak(mp4); + trak->time_to_sample_entries = entries; + + atom = &trak->stts_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + data = &trak->stts_data_buf; + data->temporary = 1; + data->pos = atom_table; + data->last = atom_end; + + trak->out[NGX_HTTP_MP4_STTS_ATOM].buf = atom; + trak->out[NGX_HTTP_MP4_STTS_DATA].buf = data; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_update_stts_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + size_t atom_size; + ngx_buf_t *atom, *data; + ngx_mp4_stts_atom_t *stts_atom; + + /* + * mdia.minf.stbl.stts updating requires trak->timescale + * from mdia.mdhd atom which may reside after mdia.minf + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stts atom update"); + + data = trak->out[NGX_HTTP_MP4_STTS_DATA].buf; + + if (data == NULL) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "no mp4 stts atoms were found in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + if (ngx_http_mp4_crop_stts_data(mp4, trak, 1) != NGX_OK) { + return NGX_ERROR; + } + + if (ngx_http_mp4_crop_stts_data(mp4, trak, 0) != NGX_OK) { + return NGX_ERROR; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "time-to-sample entries:%uD", trak->time_to_sample_entries); + + atom_size = sizeof(ngx_mp4_stts_atom_t) + (data->last - data->pos); + trak->size += atom_size; + + atom = trak->out[NGX_HTTP_MP4_STTS_ATOM].buf; + stts_atom = (ngx_mp4_stts_atom_t *) atom->pos; + ngx_mp4_set_32value(stts_atom->size, atom_size); + ngx_mp4_set_32value(stts_atom->entries, trak->time_to_sample_entries); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_crop_stts_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start) +{ + uint32_t count, duration, rest; + uint64_t start_time; + ngx_buf_t *data; + ngx_uint_t start_sample, entries, start_sec; + ngx_mp4_stts_entry_t *entry, *end; + + if (start) { + start_sec = mp4->start; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stts crop start_time:%ui", start_sec); + + } else if (mp4->length) { + start_sec = mp4->length; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stts crop end_time:%ui", start_sec); + + } else { + return NGX_OK; + } + + data = trak->out[NGX_HTTP_MP4_STTS_DATA].buf; + + start_time = (uint64_t) start_sec * trak->timescale / 1000; + + entries = trak->time_to_sample_entries; + start_sample = 0; + entry = (ngx_mp4_stts_entry_t *) data->pos; + end = (ngx_mp4_stts_entry_t *) data->last; + + while (entry < end) { + count = ngx_mp4_get_32value(entry->count); + duration = ngx_mp4_get_32value(entry->duration); + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "time:%uL, count:%uD, duration:%uD", + start_time, count, duration); + + if (start_time < (uint64_t) count * duration) { + start_sample += (ngx_uint_t) (start_time / duration); + rest = (uint32_t) (start_time / duration); + goto found; + } + + start_sample += count; + start_time -= count * duration; + entries--; + entry++; + } + + if (start) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 stts samples in \"%s\"", + mp4->file.name.data); + + return NGX_ERROR; + + } else { + trak->end_sample = trak->start_sample + start_sample; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "end_sample:%ui", trak->end_sample); + + return NGX_OK; + } + +found: + + if (start) { + ngx_mp4_set_32value(entry->count, count - rest); + data->pos = (u_char *) entry; + trak->time_to_sample_entries = entries; + trak->start_sample = start_sample; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "start_sample:%ui, new count:%uD", + trak->start_sample, count - rest); + + } else { + ngx_mp4_set_32value(entry->count, rest); + data->last = (u_char *) (entry + 1); + trak->time_to_sample_entries -= entries - 1; + trak->end_sample = trak->start_sample + start_sample; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "end_sample:%ui, new count:%uD", + trak->end_sample, rest); + } + + return NGX_OK; +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char entries[4]; +} ngx_http_mp4_stss_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_stss_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table, *atom_end; + uint32_t entries; + ngx_buf_t *atom, *data; + ngx_http_mp4_trak_t *trak; + ngx_http_mp4_stss_atom_t *stss_atom; + + /* sync samples atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 stss atom"); + + atom_header = ngx_mp4_atom_header(mp4); + stss_atom = (ngx_http_mp4_stss_atom_t *) atom_header; + ngx_mp4_set_atom_name(stss_atom, 's', 't', 's', 's'); + + if (ngx_mp4_atom_data_size(ngx_http_mp4_stss_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stss atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + entries = ngx_mp4_get_32value(stss_atom->entries); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sync sample entries:%uD", entries); + + trak = ngx_mp4_last_trak(mp4); + trak->sync_samples_entries = entries; + + atom_table = atom_header + sizeof(ngx_http_mp4_stss_atom_t); + + atom = &trak->stss_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + if (ngx_mp4_atom_data_size(ngx_http_mp4_stss_atom_t) + + entries * sizeof(uint32_t) > atom_data_size) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stss atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + atom_end = atom_table + entries * sizeof(uint32_t); + + data = &trak->stss_data_buf; + data->temporary = 1; + data->pos = atom_table; + data->last = atom_end; + + trak->out[NGX_HTTP_MP4_STSS_ATOM].buf = atom; + trak->out[NGX_HTTP_MP4_STSS_DATA].buf = data; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_update_stss_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + size_t atom_size; + uint32_t sample, start_sample, *entry, *end; + ngx_buf_t *atom, *data; + ngx_http_mp4_stss_atom_t *stss_atom; + + /* + * mdia.minf.stbl.stss updating requires trak->start_sample + * from mdia.minf.stbl.stts which depends on value from mdia.mdhd + * atom which may reside after mdia.minf + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stss atom update"); + + data = trak->out[NGX_HTTP_MP4_STSS_DATA].buf; + + if (data == NULL) { + return NGX_OK; + } + + ngx_http_mp4_crop_stss_data(mp4, trak, 1); + ngx_http_mp4_crop_stss_data(mp4, trak, 0); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sync sample entries:%uD", trak->sync_samples_entries); + + if (trak->sync_samples_entries) { + entry = (uint32_t *) data->pos; + end = (uint32_t *) data->last; + + start_sample = trak->start_sample; + + while (entry < end) { + sample = ngx_mp4_get_32value(entry); + sample -= start_sample; + ngx_mp4_set_32value(entry, sample); + entry++; + } + + } else { + trak->out[NGX_HTTP_MP4_STSS_DATA].buf = NULL; + } + + atom_size = sizeof(ngx_http_mp4_stss_atom_t) + (data->last - data->pos); + trak->size += atom_size; + + atom = trak->out[NGX_HTTP_MP4_STSS_ATOM].buf; + stss_atom = (ngx_http_mp4_stss_atom_t *) atom->pos; + + ngx_mp4_set_32value(stss_atom->size, atom_size); + ngx_mp4_set_32value(stss_atom->entries, trak->sync_samples_entries); + + return NGX_OK; +} + + +static void +ngx_http_mp4_crop_stss_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start) +{ + uint32_t sample, start_sample, *entry, *end; + ngx_buf_t *data; + ngx_uint_t entries; + + /* sync samples starts from 1 */ + + if (start) { + start_sample = trak->start_sample + 1; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stss crop start_sample:%uD", start_sample); + + } else if (mp4->length) { + start_sample = trak->end_sample + 1; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stss crop end_sample:%uD", start_sample); + + } else { + return; + } + + data = trak->out[NGX_HTTP_MP4_STSS_DATA].buf; + + entries = trak->sync_samples_entries; + entry = (uint32_t *) data->pos; + end = (uint32_t *) data->last; + + while (entry < end) { + sample = ngx_mp4_get_32value(entry); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sync:%uD", sample); + + if (sample >= start_sample) { + goto found; + } + + entries--; + entry++; + } + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sample is out of mp4 stss atom"); + +found: + + if (start) { + data->pos = (u_char *) entry; + trak->sync_samples_entries = entries; + + } else { + data->last = (u_char *) entry; + trak->sync_samples_entries -= entries; + } +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char entries[4]; +} ngx_mp4_ctts_atom_t; + +typedef struct { + u_char count[4]; + u_char offset[4]; +} ngx_mp4_ctts_entry_t; + + +static ngx_int_t +ngx_http_mp4_read_ctts_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table, *atom_end; + uint32_t entries; + ngx_buf_t *atom, *data; + ngx_mp4_ctts_atom_t *ctts_atom; + ngx_http_mp4_trak_t *trak; + + /* composition offsets atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 ctts atom"); + + atom_header = ngx_mp4_atom_header(mp4); + ctts_atom = (ngx_mp4_ctts_atom_t *) atom_header; + ngx_mp4_set_atom_name(ctts_atom, 'c', 't', 't', 's'); + + if (ngx_mp4_atom_data_size(ngx_mp4_ctts_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 ctts atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + entries = ngx_mp4_get_32value(ctts_atom->entries); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "composition offset entries:%uD", entries); + + trak = ngx_mp4_last_trak(mp4); + trak->composition_offset_entries = entries; + + atom_table = atom_header + sizeof(ngx_mp4_ctts_atom_t); + + atom = &trak->ctts_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + if (ngx_mp4_atom_data_size(ngx_mp4_ctts_atom_t) + + entries * sizeof(ngx_mp4_ctts_entry_t) > atom_data_size) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 ctts atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + atom_end = atom_table + entries * sizeof(ngx_mp4_ctts_entry_t); + + data = &trak->ctts_data_buf; + data->temporary = 1; + data->pos = atom_table; + data->last = atom_end; + + trak->out[NGX_HTTP_MP4_CTTS_ATOM].buf = atom; + trak->out[NGX_HTTP_MP4_CTTS_DATA].buf = data; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static void +ngx_http_mp4_update_ctts_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + size_t atom_size; + ngx_buf_t *atom, *data; + ngx_mp4_ctts_atom_t *ctts_atom; + + /* + * mdia.minf.stbl.ctts updating requires trak->start_sample + * from mdia.minf.stbl.stts which depends on value from mdia.mdhd + * atom which may reside after mdia.minf + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 ctts atom update"); + + data = trak->out[NGX_HTTP_MP4_CTTS_DATA].buf; + + if (data == NULL) { + return; + } + + ngx_http_mp4_crop_ctts_data(mp4, trak, 1); + ngx_http_mp4_crop_ctts_data(mp4, trak, 0); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "composition offset entries:%uD", + trak->composition_offset_entries); + + if (trak->composition_offset_entries == 0) { + trak->out[NGX_HTTP_MP4_CTTS_ATOM].buf = NULL; + trak->out[NGX_HTTP_MP4_CTTS_DATA].buf = NULL; + return; + } + + atom_size = sizeof(ngx_mp4_ctts_atom_t) + (data->last - data->pos); + trak->size += atom_size; + + atom = trak->out[NGX_HTTP_MP4_CTTS_ATOM].buf; + ctts_atom = (ngx_mp4_ctts_atom_t *) atom->pos; + + ngx_mp4_set_32value(ctts_atom->size, atom_size); + ngx_mp4_set_32value(ctts_atom->entries, trak->composition_offset_entries); + + return; +} + + +static void +ngx_http_mp4_crop_ctts_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start) +{ + uint32_t count, start_sample, rest; + ngx_buf_t *data; + ngx_uint_t entries; + ngx_mp4_ctts_entry_t *entry, *end; + + /* sync samples starts from 1 */ + + if (start) { + start_sample = trak->start_sample + 1; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 ctts crop start_sample:%uD", start_sample); + + } else if (mp4->length) { + start_sample = trak->end_sample - trak->start_sample + 1; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 ctts crop end_sample:%uD", start_sample); + + } else { + return; + } + + data = trak->out[NGX_HTTP_MP4_CTTS_DATA].buf; + + entries = trak->composition_offset_entries; + entry = (ngx_mp4_ctts_entry_t *) data->pos; + end = (ngx_mp4_ctts_entry_t *) data->last; + + while (entry < end) { + count = ngx_mp4_get_32value(entry->count); + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sample:%uD, count:%uD, offset:%uD", + start_sample, count, ngx_mp4_get_32value(entry->offset)); + + if (start_sample <= count) { + rest = start_sample - 1; + goto found; + } + + start_sample -= count; + entries--; + entry++; + } + + if (start) { + data->pos = (u_char *) end; + trak->composition_offset_entries = 0; + } + + return; + +found: + + if (start) { + ngx_mp4_set_32value(entry->count, count - rest); + data->pos = (u_char *) entry; + trak->composition_offset_entries = entries; + + } else { + ngx_mp4_set_32value(entry->count, rest); + data->last = (u_char *) (entry + 1); + trak->composition_offset_entries -= entries - 1; + } +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char entries[4]; +} ngx_mp4_stsc_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_stsc_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table, *atom_end; + uint32_t entries; + ngx_buf_t *atom, *data; + ngx_mp4_stsc_atom_t *stsc_atom; + ngx_http_mp4_trak_t *trak; + + /* sample-to-chunk atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 stsc atom"); + + atom_header = ngx_mp4_atom_header(mp4); + stsc_atom = (ngx_mp4_stsc_atom_t *) atom_header; + ngx_mp4_set_atom_name(stsc_atom, 's', 't', 's', 'c'); + + if (ngx_mp4_atom_data_size(ngx_mp4_stsc_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stsc atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + entries = ngx_mp4_get_32value(stsc_atom->entries); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sample-to-chunk entries:%uD", entries); + + if (ngx_mp4_atom_data_size(ngx_mp4_stsc_atom_t) + + entries * sizeof(ngx_mp4_stsc_entry_t) > atom_data_size) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stsc atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + atom_table = atom_header + sizeof(ngx_mp4_stsc_atom_t); + atom_end = atom_table + entries * sizeof(ngx_mp4_stsc_entry_t); + + trak = ngx_mp4_last_trak(mp4); + trak->sample_to_chunk_entries = entries; + + atom = &trak->stsc_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + data = &trak->stsc_data_buf; + data->temporary = 1; + data->pos = atom_table; + data->last = atom_end; + + trak->out[NGX_HTTP_MP4_STSC_ATOM].buf = atom; + trak->out[NGX_HTTP_MP4_STSC_DATA].buf = data; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_update_stsc_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + size_t atom_size; + uint32_t chunk; + ngx_buf_t *atom, *data; + ngx_mp4_stsc_atom_t *stsc_atom; + ngx_mp4_stsc_entry_t *entry, *end; + + /* + * mdia.minf.stbl.stsc updating requires trak->start_sample + * from mdia.minf.stbl.stts which depends on value from mdia.mdhd + * atom which may reside after mdia.minf + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stsc atom update"); + + data = trak->out[NGX_HTTP_MP4_STSC_DATA].buf; + + if (data == NULL) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "no mp4 stsc atoms were found in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + if (trak->sample_to_chunk_entries == 0) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "zero number of entries in stsc atom in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + if (ngx_http_mp4_crop_stsc_data(mp4, trak, 1) != NGX_OK) { + return NGX_ERROR; + } + + if (ngx_http_mp4_crop_stsc_data(mp4, trak, 0) != NGX_OK) { + return NGX_ERROR; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sample-to-chunk entries:%uD", + trak->sample_to_chunk_entries); + + entry = (ngx_mp4_stsc_entry_t *) data->pos; + end = (ngx_mp4_stsc_entry_t *) data->last; + + while (entry < end) { + chunk = ngx_mp4_get_32value(entry->chunk); + chunk -= trak->start_chunk; + ngx_mp4_set_32value(entry->chunk, chunk); + entry++; + } + + atom_size = sizeof(ngx_mp4_stsc_atom_t) + + trak->sample_to_chunk_entries * sizeof(ngx_mp4_stsc_entry_t); + + trak->size += atom_size; + + atom = trak->out[NGX_HTTP_MP4_STSC_ATOM].buf; + stsc_atom = (ngx_mp4_stsc_atom_t *) atom->pos; + + ngx_mp4_set_32value(stsc_atom->size, atom_size); + ngx_mp4_set_32value(stsc_atom->entries, trak->sample_to_chunk_entries); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_crop_stsc_data(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, ngx_uint_t start) +{ + uint32_t start_sample, chunk, samples, id, next_chunk, n, + prev_samples; + ngx_buf_t *data, *buf; + ngx_uint_t entries, target_chunk, chunk_samples; + ngx_mp4_stsc_entry_t *entry, *end, *first; + + entries = trak->sample_to_chunk_entries - 1; + + if (start) { + start_sample = (uint32_t) trak->start_sample; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stsc crop start_sample:%uD", start_sample); + + } else if (mp4->length) { + start_sample = (uint32_t) (trak->end_sample - trak->start_sample); + samples = 0; + + data = trak->out[NGX_HTTP_MP4_STSC_START].buf; + + if (data) { + entry = (ngx_mp4_stsc_entry_t *) data->pos; + samples = ngx_mp4_get_32value(entry->samples); + entries--; + + if (samples > start_sample) { + samples = start_sample; + ngx_mp4_set_32value(entry->samples, samples); + } + + start_sample -= samples; + } + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stsc crop end_sample:%uD, ext_samples:%uD", + start_sample, samples); + + } else { + return NGX_OK; + } + + data = trak->out[NGX_HTTP_MP4_STSC_DATA].buf; + + entry = (ngx_mp4_stsc_entry_t *) data->pos; + end = (ngx_mp4_stsc_entry_t *) data->last; + + chunk = ngx_mp4_get_32value(entry->chunk); + samples = ngx_mp4_get_32value(entry->samples); + id = ngx_mp4_get_32value(entry->id); + prev_samples = 0; + entry++; + + while (entry < end) { + + next_chunk = ngx_mp4_get_32value(entry->chunk); + + ngx_log_debug5(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sample:%uD, chunk:%uD, chunks:%uD, " + "samples:%uD, id:%uD", + start_sample, chunk, next_chunk - chunk, samples, id); + + n = (next_chunk - chunk) * samples; + + if (start_sample < n) { + goto found; + } + + start_sample -= n; + + prev_samples = samples; + chunk = next_chunk; + samples = ngx_mp4_get_32value(entry->samples); + id = ngx_mp4_get_32value(entry->id); + entries--; + entry++; + } + + next_chunk = trak->chunks + 1; + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sample:%uD, chunk:%uD, chunks:%uD, samples:%uD", + start_sample, chunk, next_chunk - chunk, samples); + + n = (next_chunk - chunk) * samples; + + if (start_sample > n) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "%s time is out mp4 stsc chunks in \"%s\"", + start ? "start" : "end", mp4->file.name.data); + return NGX_ERROR; + } + +found: + + entries++; + entry--; + + if (samples == 0) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "zero number of samples in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + target_chunk = chunk - 1; + target_chunk += start_sample / samples; + chunk_samples = start_sample % samples; + + if (start) { + data->pos = (u_char *) entry; + + trak->sample_to_chunk_entries = entries; + trak->start_chunk = target_chunk; + trak->start_chunk_samples = chunk_samples; + + ngx_mp4_set_32value(entry->chunk, trak->start_chunk + 1); + + samples -= chunk_samples; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "start_chunk:%ui, start_chunk_samples:%ui", + trak->start_chunk, trak->start_chunk_samples); + + } else { + if (start_sample) { + data->last = (u_char *) (entry + 1); + trak->sample_to_chunk_entries -= entries - 1; + trak->end_chunk_samples = samples; + + } else { + data->last = (u_char *) entry; + trak->sample_to_chunk_entries -= entries; + trak->end_chunk_samples = prev_samples; + } + + if (chunk_samples) { + trak->end_chunk = target_chunk + 1; + trak->end_chunk_samples = chunk_samples; + + } else { + trak->end_chunk = target_chunk; + } + + samples = chunk_samples; + next_chunk = chunk + 1; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "end_chunk:%ui, end_chunk_samples:%ui", + trak->end_chunk, trak->end_chunk_samples); + } + + if (chunk_samples && next_chunk - target_chunk == 2) { + + ngx_mp4_set_32value(entry->samples, samples); + + } else if (chunk_samples && start) { + + first = &trak->stsc_start_chunk_entry; + ngx_mp4_set_32value(first->chunk, 1); + ngx_mp4_set_32value(first->samples, samples); + ngx_mp4_set_32value(first->id, id); + + buf = &trak->stsc_start_chunk_buf; + buf->temporary = 1; + buf->pos = (u_char *) first; + buf->last = (u_char *) first + sizeof(ngx_mp4_stsc_entry_t); + + trak->out[NGX_HTTP_MP4_STSC_START].buf = buf; + + ngx_mp4_set_32value(entry->chunk, trak->start_chunk + 2); + + trak->sample_to_chunk_entries++; + + } else if (chunk_samples) { + + first = &trak->stsc_end_chunk_entry; + ngx_mp4_set_32value(first->chunk, trak->end_chunk - trak->start_chunk); + ngx_mp4_set_32value(first->samples, samples); + ngx_mp4_set_32value(first->id, id); + + buf = &trak->stsc_end_chunk_buf; + buf->temporary = 1; + buf->pos = (u_char *) first; + buf->last = (u_char *) first + sizeof(ngx_mp4_stsc_entry_t); + + trak->out[NGX_HTTP_MP4_STSC_END].buf = buf; + + trak->sample_to_chunk_entries++; + } + + return NGX_OK; +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char uniform_size[4]; + u_char entries[4]; +} ngx_mp4_stsz_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_stsz_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table, *atom_end; + size_t atom_size; + uint32_t entries, size; + ngx_buf_t *atom, *data; + ngx_mp4_stsz_atom_t *stsz_atom; + ngx_http_mp4_trak_t *trak; + + /* sample sizes atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 stsz atom"); + + atom_header = ngx_mp4_atom_header(mp4); + stsz_atom = (ngx_mp4_stsz_atom_t *) atom_header; + ngx_mp4_set_atom_name(stsz_atom, 's', 't', 's', 'z'); + + if (ngx_mp4_atom_data_size(ngx_mp4_stsz_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stsz atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + size = ngx_mp4_get_32value(stsz_atom->uniform_size); + entries = ngx_mp4_get_32value(stsz_atom->entries); + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "sample uniform size:%uD, entries:%uD", size, entries); + + trak = ngx_mp4_last_trak(mp4); + trak->sample_sizes_entries = entries; + + atom_table = atom_header + sizeof(ngx_mp4_stsz_atom_t); + + atom = &trak->stsz_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + trak->out[NGX_HTTP_MP4_STSZ_ATOM].buf = atom; + + if (size == 0) { + if (ngx_mp4_atom_data_size(ngx_mp4_stsz_atom_t) + + entries * sizeof(uint32_t) > atom_data_size) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stsz atom too small", + mp4->file.name.data); + return NGX_ERROR; + } + + atom_end = atom_table + entries * sizeof(uint32_t); + + data = &trak->stsz_data_buf; + data->temporary = 1; + data->pos = atom_table; + data->last = atom_end; + + trak->out[NGX_HTTP_MP4_STSZ_DATA].buf = data; + + } else { + /* if size != 0 then all samples are the same size */ + /* TODO : chunk samples */ + atom_size = sizeof(ngx_mp4_atom_header_t) + (size_t) atom_data_size; + ngx_mp4_set_32value(atom_header, atom_size); + trak->size += atom_size; + } + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_update_stsz_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + size_t atom_size; + uint32_t *pos, *end, entries; + ngx_buf_t *atom, *data; + ngx_mp4_stsz_atom_t *stsz_atom; + + /* + * mdia.minf.stbl.stsz updating requires trak->start_sample + * from mdia.minf.stbl.stts which depends on value from mdia.mdhd + * atom which may reside after mdia.minf + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stsz atom update"); + + data = trak->out[NGX_HTTP_MP4_STSZ_DATA].buf; + + if (data) { + entries = trak->sample_sizes_entries; + + if (trak->start_sample > entries) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 stsz samples in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + entries -= trak->start_sample; + data->pos += trak->start_sample * sizeof(uint32_t); + end = (uint32_t *) data->pos; + + for (pos = end - trak->start_chunk_samples; pos < end; pos++) { + trak->start_chunk_samples_size += ngx_mp4_get_32value(pos); + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "chunk samples sizes:%uL", + trak->start_chunk_samples_size); + + if (mp4->length) { + if (trak->end_sample - trak->start_sample > entries) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "end time is out mp4 stsz samples in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + entries = trak->end_sample - trak->start_sample; + data->last = data->pos + entries * sizeof(uint32_t); + end = (uint32_t *) data->last; + + for (pos = end - trak->end_chunk_samples; pos < end; pos++) { + trak->end_chunk_samples_size += ngx_mp4_get_32value(pos); + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stsz end_chunk_samples_size:%uL", + trak->end_chunk_samples_size); + } + + atom_size = sizeof(ngx_mp4_stsz_atom_t) + (data->last - data->pos); + trak->size += atom_size; + + atom = trak->out[NGX_HTTP_MP4_STSZ_ATOM].buf; + stsz_atom = (ngx_mp4_stsz_atom_t *) atom->pos; + + ngx_mp4_set_32value(stsz_atom->size, atom_size); + ngx_mp4_set_32value(stsz_atom->entries, entries); + } + + return NGX_OK; +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char entries[4]; +} ngx_mp4_stco_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_stco_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table, *atom_end; + uint32_t entries; + ngx_buf_t *atom, *data; + ngx_mp4_stco_atom_t *stco_atom; + ngx_http_mp4_trak_t *trak; + + /* chunk offsets atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 stco atom"); + + atom_header = ngx_mp4_atom_header(mp4); + stco_atom = (ngx_mp4_stco_atom_t *) atom_header; + ngx_mp4_set_atom_name(stco_atom, 's', 't', 'c', 'o'); + + if (ngx_mp4_atom_data_size(ngx_mp4_stco_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stco atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + entries = ngx_mp4_get_32value(stco_atom->entries); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "chunks:%uD", entries); + + if (ngx_mp4_atom_data_size(ngx_mp4_stco_atom_t) + + entries * sizeof(uint32_t) > atom_data_size) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 stco atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + atom_table = atom_header + sizeof(ngx_mp4_stco_atom_t); + atom_end = atom_table + entries * sizeof(uint32_t); + + trak = ngx_mp4_last_trak(mp4); + trak->chunks = entries; + + atom = &trak->stco_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + data = &trak->stco_data_buf; + data->temporary = 1; + data->pos = atom_table; + data->last = atom_end; + + trak->out[NGX_HTTP_MP4_STCO_ATOM].buf = atom; + trak->out[NGX_HTTP_MP4_STCO_DATA].buf = data; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_update_stco_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + size_t atom_size; + uint32_t entries; + ngx_buf_t *atom, *data; + ngx_mp4_stco_atom_t *stco_atom; + + /* + * mdia.minf.stbl.stco updating requires trak->start_chunk + * from mdia.minf.stbl.stsc which depends on value from mdia.mdhd + * atom which may reside after mdia.minf + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stco atom update"); + + data = trak->out[NGX_HTTP_MP4_STCO_DATA].buf; + + if (data == NULL) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "no mp4 stco atoms were found in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + if (trak->start_chunk > trak->chunks) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 stco chunks in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + data->pos += trak->start_chunk * sizeof(uint32_t); + + trak->start_offset = ngx_mp4_get_32value(data->pos); + trak->start_offset += trak->start_chunk_samples_size; + ngx_mp4_set_32value(data->pos, trak->start_offset); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "start chunk offset:%O", trak->start_offset); + + if (mp4->length) { + + if (trak->end_chunk > trak->chunks) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "end time is out mp4 stco chunks in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + entries = trak->end_chunk - trak->start_chunk; + data->last = data->pos + entries * sizeof(uint32_t); + + if (entries) { + trak->end_offset = + ngx_mp4_get_32value(data->last - sizeof(uint32_t)); + trak->end_offset += trak->end_chunk_samples_size; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "end chunk offset:%O", trak->end_offset); + } + + } else { + entries = trak->chunks - trak->start_chunk; + trak->end_offset = mp4->mdat_data.buf->file_last; + } + + if (entries == 0) { + trak->start_offset = mp4->end; + trak->end_offset = 0; + } + + atom_size = sizeof(ngx_mp4_stco_atom_t) + (data->last - data->pos); + trak->size += atom_size; + + atom = trak->out[NGX_HTTP_MP4_STCO_ATOM].buf; + stco_atom = (ngx_mp4_stco_atom_t *) atom->pos; + + ngx_mp4_set_32value(stco_atom->size, atom_size); + ngx_mp4_set_32value(stco_atom->entries, entries); + + return NGX_OK; +} + + +static void +ngx_http_mp4_adjust_stco_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, int32_t adjustment) +{ + uint32_t offset, *entry, *end; + ngx_buf_t *data; + + /* + * moov.trak.mdia.minf.stbl.stco adjustment requires + * minimal start offset of all traks and new moov atom size + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 stco atom adjustment"); + + data = trak->out[NGX_HTTP_MP4_STCO_DATA].buf; + entry = (uint32_t *) data->pos; + end = (uint32_t *) data->last; + + while (entry < end) { + offset = ngx_mp4_get_32value(entry); + offset += adjustment; + ngx_mp4_set_32value(entry, offset); + entry++; + } +} + + +typedef struct { + u_char size[4]; + u_char name[4]; + u_char version[1]; + u_char flags[3]; + u_char entries[4]; +} ngx_mp4_co64_atom_t; + + +static ngx_int_t +ngx_http_mp4_read_co64_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size) +{ + u_char *atom_header, *atom_table, *atom_end; + uint32_t entries; + ngx_buf_t *atom, *data; + ngx_mp4_co64_atom_t *co64_atom; + ngx_http_mp4_trak_t *trak; + + /* chunk offsets atom */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 co64 atom"); + + atom_header = ngx_mp4_atom_header(mp4); + co64_atom = (ngx_mp4_co64_atom_t *) atom_header; + ngx_mp4_set_atom_name(co64_atom, 'c', 'o', '6', '4'); + + if (ngx_mp4_atom_data_size(ngx_mp4_co64_atom_t) > atom_data_size) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 co64 atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + entries = ngx_mp4_get_32value(co64_atom->entries); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "chunks:%uD", entries); + + if (ngx_mp4_atom_data_size(ngx_mp4_co64_atom_t) + + entries * sizeof(uint64_t) > atom_data_size) + { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "\"%s\" mp4 co64 atom too small", mp4->file.name.data); + return NGX_ERROR; + } + + atom_table = atom_header + sizeof(ngx_mp4_co64_atom_t); + atom_end = atom_table + entries * sizeof(uint64_t); + + trak = ngx_mp4_last_trak(mp4); + trak->chunks = entries; + + atom = &trak->co64_atom_buf; + atom->temporary = 1; + atom->pos = atom_header; + atom->last = atom_table; + + data = &trak->co64_data_buf; + data->temporary = 1; + data->pos = atom_table; + data->last = atom_end; + + trak->out[NGX_HTTP_MP4_CO64_ATOM].buf = atom; + trak->out[NGX_HTTP_MP4_CO64_DATA].buf = data; + + ngx_mp4_atom_next(mp4, atom_data_size); + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_mp4_update_co64_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak) +{ + size_t atom_size; + uint64_t entries; + ngx_buf_t *atom, *data; + ngx_mp4_co64_atom_t *co64_atom; + + /* + * mdia.minf.stbl.co64 updating requires trak->start_chunk + * from mdia.minf.stbl.stsc which depends on value from mdia.mdhd + * atom which may reside after mdia.minf + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 co64 atom update"); + + data = trak->out[NGX_HTTP_MP4_CO64_DATA].buf; + + if (data == NULL) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "no mp4 co64 atoms were found in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + if (trak->start_chunk > trak->chunks) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 co64 chunks in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + data->pos += trak->start_chunk * sizeof(uint64_t); + + trak->start_offset = ngx_mp4_get_64value(data->pos); + trak->start_offset += trak->start_chunk_samples_size; + ngx_mp4_set_64value(data->pos, trak->start_offset); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "start chunk offset:%O", trak->start_offset); + + if (mp4->length) { + + if (trak->end_chunk > trak->chunks) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "end time is out mp4 co64 chunks in \"%s\"", + mp4->file.name.data); + return NGX_ERROR; + } + + entries = trak->end_chunk - trak->start_chunk; + data->last = data->pos + entries * sizeof(uint64_t); + + if (entries) { + trak->end_offset = + ngx_mp4_get_64value(data->last - sizeof(uint64_t)); + trak->end_offset += trak->end_chunk_samples_size; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "end chunk offset:%O", trak->end_offset); + } + + } else { + entries = trak->chunks - trak->start_chunk; + trak->end_offset = mp4->mdat_data.buf->file_last; + } + + if (entries == 0) { + trak->start_offset = mp4->end; + trak->end_offset = 0; + } + + atom_size = sizeof(ngx_mp4_co64_atom_t) + (data->last - data->pos); + trak->size += atom_size; + + atom = trak->out[NGX_HTTP_MP4_CO64_ATOM].buf; + co64_atom = (ngx_mp4_co64_atom_t *) atom->pos; + + ngx_mp4_set_32value(co64_atom->size, atom_size); + ngx_mp4_set_32value(co64_atom->entries, entries); + + return NGX_OK; +} + + +static void +ngx_http_mp4_adjust_co64_atom(ngx_http_mp4_file_t *mp4, + ngx_http_mp4_trak_t *trak, off_t adjustment) +{ + uint64_t offset, *entry, *end; + ngx_buf_t *data; + + /* + * moov.trak.mdia.minf.stbl.co64 adjustment requires + * minimal start offset of all traks and new moov atom size + */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, + "mp4 co64 atom adjustment"); + + data = trak->out[NGX_HTTP_MP4_CO64_DATA].buf; + entry = (uint64_t *) data->pos; + end = (uint64_t *) data->last; + + while (entry < end) { + offset = ngx_mp4_get_64value(entry); + offset += adjustment; + ngx_mp4_set_64value(entry, offset); + entry++; + } +} + + +static char * +ngx_http_mp4(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) +{ + ngx_http_core_loc_conf_t *clcf; + + clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); + clcf->handler = ngx_http_mp4_handler; + + return NGX_CONF_OK; +} + + +static void * +ngx_http_mp4_create_conf(ngx_conf_t *cf) +{ + ngx_http_mp4_conf_t *conf; + + conf = ngx_palloc(cf->pool, sizeof(ngx_http_mp4_conf_t)); + if (conf == NULL) { + return NULL; + } + + conf->buffer_size = NGX_CONF_UNSET_SIZE; + conf->max_buffer_size = NGX_CONF_UNSET_SIZE; + + return conf; +} + + +static char * +ngx_http_mp4_merge_conf(ngx_conf_t *cf, void *parent, void *child) +{ + ngx_http_mp4_conf_t *prev = parent; + ngx_http_mp4_conf_t *conf = child; + + ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, 512 * 1024); + ngx_conf_merge_size_value(conf->max_buffer_size, prev->max_buffer_size, + 10 * 1024 * 1024); + + return NGX_CONF_OK; +} |