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mkv: Add options for specifying cluster limits 

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato 2013-08-18 20:09:40 +02:00
parent 148fbdd1c2
commit 98308bd44f
1 changed files with 22 additions and 10 deletions
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32
libavformat/matroskaenc.c
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@ -100,7 +100,9 @@ typedef struct MatroskaMuxContext {
int have_attachments;
int reserve_cues_space;
int cluster_size_limit;
int64_t cues_pos;
int64_t cluster_time_limit;
} MatroskaMuxContext;
@ -994,6 +996,21 @@ static int mkv_write_header(AVFormatContext *s)
mkv->cur_audio_pkt.size = 0;
avio_flush(pb);
// start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
// after 4k and on a keyframe
if (pb->seekable) {
if (mkv->cluster_time_limit < 0)
mkv->cluster_time_limit = 5000;
if (mkv->cluster_size_limit < 0)
mkv->cluster_size_limit = 5 * 1024 * 1024;
} else {
if (mkv->cluster_time_limit < 0)
mkv->cluster_time_limit = 1000;
if (mkv->cluster_size_limit < 0)
mkv->cluster_size_limit = 32 * 1024;
}
return 0;
}
@ -1267,9 +1284,7 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
int cluster_size;
int cluster_size_limit;
int64_t cluster_time;
int64_t cluster_time_limit;
AVIOContext *pb;
int ret;
@ -1283,18 +1298,14 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
if (s->pb->seekable) {
pb = s->pb;
cluster_size = avio_tell(pb) - mkv->cluster_pos;
cluster_time_limit = 5000;
cluster_size_limit = 5 * 1024 * 1024;
} else {
pb = mkv->dyn_bc;
cluster_size = avio_tell(pb);
cluster_time_limit = 1000;
cluster_size_limit = 32 * 1024;
}
if (mkv->cluster_pos &&
(cluster_size > cluster_size_limit ||
cluster_time > cluster_time_limit ||
(cluster_size > mkv->cluster_size_limit ||
cluster_time > mkv->cluster_time_limit ||
(codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
cluster_size > 4 * 1024))) {
av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
@ -1421,8 +1432,9 @@ static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
#define OFFSET(x) offsetof(MatroskaMuxContext, x)
#define FLAGS AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning "
"of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "cluster_size_limit", "Store at most the provided amount of bytes in a cluster. ", OFFSET(cluster_size_limit), AV_OPT_TYPE_INT , { .i64 = -1 }, -1, INT_MAX, FLAGS },
{ "cluster_time_limit", "Store at most the provided number of milliseconds in a cluster.", OFFSET(cluster_time_limit), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
{ NULL },
};