RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

avformat/dashdec: Avoid multiple HTTP requests for initialization segment that is common among all representations 

Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: sanilraut <raut.sanil@gmail.com>
This commit is contained in:
Steven Liu 2018-04-17 14:19:00 +08:00
parent 6fbfb20faf
commit 4effd1c4a2
1 changed files with 71 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
libavformat/dashdec.c
View File

@ -149,6 +149,11 @@ typedef struct DASHContext {
char *allowed_extensions;
AVDictionary *avio_opts;
int max_url_size;
/* Flags for init section*/
int is_init_section_common_video;
int is_init_section_common_audio;
} DASHContext;
static int ishttp(char *url)
@ -1862,6 +1867,45 @@ fail:
return ret;
}
static int init_section_compare_video(DASHContext *c)
{
int i = 0;
char *url = c->videos[0]->init_section->url;
int64_t url_offset = c->videos[0]->init_section->url_offset;
int64_t size = c->videos[0]->init_section->size;
for (i=0;i<c->n_videos;i++) {
if (av_strcasecmp(c->videos[i]->init_section->url,url) || c->videos[i]->init_section->url_offset != url_offset || c->videos[i]->init_section->size != size) {
return 0;
}
}
return 1;
}
static int init_section_compare_audio(DASHContext *c)
{
int i = 0;
char *url = c->audios[0]->init_section->url;
int64_t url_offset = c->audios[0]->init_section->url_offset;
int64_t size = c->audios[0]->init_section->size;
for (i=0;i<c->n_audios;i++) {
if (av_strcasecmp(c->audios[i]->init_section->url,url) || c->audios[i]->init_section->url_offset != url_offset || c->audios[i]->init_section->size != size) {
return 0;
}
}
return 1;
}
static void copy_init_section(struct representation *rep_dest, struct representation *rep_src)
{
memcpy(rep_dest->init_section, rep_src->init_section, sizeof(rep_src->init_section));
rep_dest->init_sec_buf = av_mallocz(rep_src->init_sec_buf_size);
memcpy(rep_dest->init_sec_buf, rep_src->init_sec_buf, rep_src->init_sec_data_len);
rep_dest->init_sec_buf_size = rep_src->init_sec_buf_size;
rep_dest->init_sec_data_len = rep_src->init_sec_data_len;
rep_dest->cur_timestamp = rep_src->cur_timestamp;
}
static int dash_read_header(AVFormatContext *s)
{
void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
@ -1890,19 +1934,35 @@ static int dash_read_header(AVFormatContext *s)
s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE;
}
if (c->n_videos) {
c->is_init_section_common_video = init_section_compare_video(c);
}
/* Open the demuxer for video and audio components if available */
for (i = 0; i < c->n_videos; i++) {
struct representation *cur_video = c->videos[i];
if (i > 0 && c->is_init_section_common_video) {
copy_init_section(cur_video,c->videos[0]);
}
ret = open_demux_for_component(s, cur_video);
if (ret)
goto fail;
cur_video->stream_index = stream_index;
++stream_index;
}
if (c->n_audios) {
c->is_init_section_common_audio = init_section_compare_audio(c);
}
for (i = 0; i < c->n_audios; i++) {
struct representation *cur_audio = c->audios[i];
if (i > 0 && c->is_init_section_common_audio) {
copy_init_section(cur_audio,c->audios[0]);
}
ret = open_demux_for_component(s, cur_audio);
if (ret)
goto fail;
cur_audio->stream_index = stream_index;