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avformat/hls: Use an array instead of stream offset for stream mapping 

This will be useful when the amount of streams per subdemuxer is not
known at hls_read_header time in a following commit.
This commit is contained in:
Anssi Hannula 2016-07-27 23:29:16 +03:00
parent 4d85069e5d
commit 9884f17e34
1 changed files with 38 additions and 21 deletions
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59
libavformat/hls.c
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@ -98,7 +98,11 @@ struct playlist {
int index;
AVFormatContext *ctx;
AVPacket pkt;
int stream_offset;
/* main demuxer streams associated with this playlist
* indexed by the subdemuxer stream indexes */
AVStream **main_streams;
int n_main_streams;
int finished;
enum PlaylistType type;
@ -239,6 +243,7 @@ static void free_playlist_list(HLSContext *c)
struct playlist *pls = c->playlists[i];
free_segment_list(pls);
free_init_section_list(pls);
av_freep(&pls->main_streams);
av_freep(&pls->renditions);
av_freep(&pls->id3_buf);
av_dict_free(&pls->id3_initial);
@ -1248,13 +1253,13 @@ restart:
/* Check that the playlist is still needed before opening a new
* segment. */
if (v->ctx && v->ctx->nb_streams &&
v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
if (v->ctx && v->ctx->nb_streams) {
v->needed = 0;
for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
i++) {
if (v->parent->streams[i]->discard < AVDISCARD_ALL)
for (i = 0; i < v->n_main_streams; i++) {
if (v->main_streams[i]->discard < AVDISCARD_ALL) {
v->needed = 1;
break;
}
}
}
if (!v->needed) {
@ -1392,8 +1397,8 @@ static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pl
int rend_idx = 0;
int i;
for (i = 0; i < pls->ctx->nb_streams; i++) {
AVStream *st = s->streams[pls->stream_offset + i];
for (i = 0; i < pls->n_main_streams; i++) {
AVStream *st = pls->main_streams[i];
if (st->codecpar->codec_type != type)
continue;
@ -1519,7 +1524,7 @@ static int hls_read_header(AVFormatContext *s)
{
void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
HLSContext *c = s->priv_data;
int ret = 0, i, j, stream_offset = 0;
int ret = 0, i, j;
int highest_cur_seq_no = 0;
c->ctx = s;
@ -1659,7 +1664,6 @@ static int hls_read_header(AVFormatContext *s)
}
pls->ctx->pb = &pls->pb;
pls->ctx->io_open = nested_io_open;
pls->stream_offset = stream_offset;
if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
goto fail;
@ -1699,13 +1703,13 @@ static int hls_read_header(AVFormatContext *s)
avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
else
avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
}
add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
stream_offset += pls->ctx->nb_streams;
}
/* Create a program for each variant */
@ -1723,10 +1727,10 @@ static int hls_read_header(AVFormatContext *s)
int is_shared = playlist_in_multiple_variants(c, pls);
int k;
for (k = 0; k < pls->ctx->nb_streams; k++) {
struct AVStream *st = s->streams[pls->stream_offset + k];
for (k = 0; k < pls->n_main_streams; k++) {
struct AVStream *st = pls->main_streams[k];
av_program_add_stream_index(s, i, pls->stream_offset + k);
av_program_add_stream_index(s, i, st->index);
/* Set variant_bitrate for streams unique to this variant */
if (!is_shared && v->bandwidth)
@ -1905,8 +1909,17 @@ static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
/* If we got a packet, return it */
if (minplaylist >= 0) {
struct playlist *pls = c->playlists[minplaylist];
if (pls->pkt.stream_index >= pls->n_main_streams) {
av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
av_packet_unref(&pls->pkt);
reset_packet(&pls->pkt);
return AVERROR_BUG;
}
*pkt = pls->pkt;
pkt->stream_index += pls->stream_offset;
pkt->stream_index = pls->main_streams[pls->pkt.stream_index]->index;
reset_packet(&c->playlists[minplaylist]->pkt);
if (pkt->dts != AV_NOPTS_VALUE)
@ -1938,6 +1951,8 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
HLSContext *c = s->priv_data;
struct playlist *seek_pls = NULL;
int i, seq_no;
int j;
int stream_subdemuxer_index;
int64_t first_timestamp, seek_timestamp, duration;
if ((flags & AVSEEK_FLAG_BYTE) ||
@ -1961,10 +1976,12 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
/* find the playlist with the specified stream */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
if (stream_index >= pls->stream_offset &&
stream_index - pls->stream_offset < pls->ctx->nb_streams) {
seek_pls = pls;
break;
for (j = 0; j < pls->n_main_streams; j++) {
if (pls->main_streams[j] == s->streams[stream_index]) {
seek_pls = pls;
stream_subdemuxer_index = j;
break;
}
}
}
/* check if the timestamp is valid for the playlist with the
@ -1974,7 +1991,7 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
/* set segment now so we do not need to search again below */
seek_pls->cur_seq_no = seq_no;
seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset;
seek_pls->seek_stream_index = stream_subdemuxer_index;
for (i = 0; i < c->n_playlists; i++) {
/* Reset reading */