From 98308bd44face14ea3142b501d16226eec23b75a Mon Sep 17 00:00:00 2001 From: Luca Barbato Date: Sun, 18 Aug 2013 20:09:40 +0200 Subject: mkv: Add options for specifying cluster limits Signed-off-by: Luca Barbato --- libavformat/matroskaenc.c | 32 ++++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 10 deletions(-) (limited to 'libavformat/matroskaenc.c') diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c index 846353e530..ead0a82467 100644 --- a/libavformat/matroskaenc.c +++ b/libavformat/matroskaenc.c @@ -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 }, }; -- cgit v1.2.3