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libavformat/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:
sanilraut 2018-04-17 14:36:45 +08:00 committed by Steven Liu
parent 0b3c1854cb
commit 9e2b4c7ecc
1 changed files with 71 additions and 11 deletions
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82
libavformat/dashdec.c
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@ -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)
@ -416,9 +421,9 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
if (av_strstart(proto_name, "file", NULL)) {
if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
av_log(s, AV_LOG_ERROR,
"Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
"If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
url);
"Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
"If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
url);
return AVERROR_INVALIDDATA;
}
} else if (av_strstart(proto_name, "http", NULL)) {
@ -931,7 +936,7 @@ static int parse_manifest_representation(AVFormatContext *s, const char *url,
rep->last_seq_no =(int64_t) strtoll(val, NULL, 10) - 1;
xmlFree(val);
}
}
}
}
fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
@ -1160,7 +1165,7 @@ static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
} else {
LIBXML_TEST_VERSION
doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
root_element = xmlDocGetRootElement(doc);
node = root_element;
@ -1396,14 +1401,14 @@ static int refresh_manifest(AVFormatContext *s)
if (c->n_videos != n_videos) {
av_log(c, AV_LOG_ERROR,
"new manifest has mismatched no. of video representations, %d -> %d\n",
n_videos, c->n_videos);
"new manifest has mismatched no. of video representations, %d -> %d\n",
n_videos, c->n_videos);
return AVERROR_INVALIDDATA;
}
if (c->n_audios != n_audios) {
av_log(c, AV_LOG_ERROR,
"new manifest has mismatched no. of audio representations, %d -> %d\n",
n_audios, c->n_audios);
"new manifest has mismatched no. of audio representations, %d -> %d\n",
n_audios, c->n_audios);
return AVERROR_INVALIDDATA;
}
@ -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;
@ -1931,7 +1991,7 @@ static int dash_read_header(AVFormatContext *s)
av_dict_set_int(&pls->assoc_stream->metadata, "variant_bitrate", pls->bandwidth, 0);
if (pls->id[0])
av_dict_set(&pls->assoc_stream->metadata, "id", pls->id, 0);
}
}
for (i = 0; i < c->n_audios; i++) {
struct representation *pls = c->audios[i];
@ -2048,7 +2108,7 @@ static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t see
int64_t duration = 0;
av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms], playlist %d%s\n",
seek_pos_msec, pls->rep_idx, dry_run ? " (dry)" : "");
seek_pos_msec, pls->rep_idx, dry_run ? " (dry)" : "");
// single fragment mode
if (pls->n_fragments == 1) {