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avformat/hls: fix seeking around EVENT playlist after media sequence changes

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The seek functions use first_timestamp, so keep that up to date as
old segments drop off the playlist.

Signed-off-by: Aman Gupta <aman@tmm1.net>
This commit is contained in:
Aman Gupta 2018-04-23 17:30:21 -07:00
parent b7cd2ab22e
commit 673d8cfd51
1 changed files with 38 additions and 8 deletions
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42
libavformat/hls.c
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@ -211,14 +211,19 @@ typedef struct HLSContext {
AVIOContext *playlist_pb;
} HLSContext;
static void free_segment_list(struct playlist *pls)
static void free_segment_dynarray(struct segment **segments, int n_segments)
{
int i;
for (i = 0; i < pls->n_segments; i++) {
av_freep(&pls->segments[i]->key);
av_freep(&pls->segments[i]->url);
av_freep(&pls->segments[i]);
for (i = 0; i < n_segments; i++) {
av_freep(&segments[i]->key);
av_freep(&segments[i]->url);
av_freep(&segments[i]);
}
}
static void free_segment_list(struct playlist *pls)
{
free_segment_dynarray(pls->segments, pls->n_segments);
av_freep(&pls->segments);
pls->n_segments = 0;
}
@ -698,6 +703,9 @@ static int parse_playlist(HLSContext *c, const char *url,
char tmp_str[MAX_URL_SIZE];
struct segment *cur_init_section = NULL;
int is_http = av_strstart(url, "http", NULL);
struct segment **prev_segments = NULL;
int prev_n_segments = 0;
int prev_start_seq_no = -1;
if (is_http && !in && c->http_persistent && c->playlist_pb) {
in = c->playlist_pb;
@ -741,7 +749,12 @@ static int parse_playlist(HLSContext *c, const char *url,
}
if (pls) {
free_segment_list(pls);
prev_start_seq_no = pls->start_seq_no;
prev_segments = pls->segments;
prev_n_segments = pls->n_segments;
pls->segments = NULL;
pls->n_segments = 0;
pls->finished = 0;
pls->type = PLS_TYPE_UNSPECIFIED;
}
@ -881,6 +894,23 @@ static int parse_playlist(HLSContext *c, const char *url,
}
}
}
if (prev_segments) {
if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
int64_t prev_timestamp = c->first_timestamp;
int i, diff = pls->start_seq_no - prev_start_seq_no;
for (i = 0; i < prev_n_segments && i < diff; i++) {
c->first_timestamp += prev_segments[i]->duration;
}
av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%d -> %d)"
" reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
prev_start_seq_no, pls->start_seq_no,
prev_timestamp, c->first_timestamp);
} else if (pls->start_seq_no < prev_start_seq_no) {
av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %d -> %d\n",
prev_start_seq_no, pls->start_seq_no);
}
free_segment_dynarray(prev_segments, prev_n_segments);
}
if (pls)
pls->last_load_time = av_gettime_relative();