blob: 0e93fbd09a68adba01974264d3ce2de0fc8df999 [file] [log] [blame]
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/*
* 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) \
\
if (n > (size_t) (mp4->buffer_end - mp4->buffer_pos)) { \
mp4->buffer_pos = mp4->buffer_end; \
\
} else { \
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) {
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_calloc_buf(r->pool);
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);
if (atom_size < sizeof(ngx_mp4_atom_header64_t)) {
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;
}
} 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)