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Ensure that we write clusters and blocks with known size when streaming

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Too many demuxers can't cope with clusters of unknown size.

Originally committed as revision 22201 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2010-03-04 08:53:14 +00:00
parent 434a70b8f1
commit 871b641b80
1 changed files with 40 additions and 11 deletions
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51
libavformat/matroskaenc.c
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@ -62,6 +62,7 @@ typedef struct {
} mkv_cues;
typedef struct MatroskaMuxContext {
ByteIOContext *dyn_bc;
ebml_master segment;
int64_t segment_offset;
int64_t segment_uid;
@ -760,10 +761,9 @@ static int ass_get_duration(const uint8_t *p)
return end - start;
}
static int mkv_write_ass_blocks(AVFormatContext *s, AVPacket *pkt)
static int mkv_write_ass_blocks(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = s->pb;
int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
uint8_t *start, *end, *data = pkt->data;
ebml_master blockgroup;
@ -806,10 +806,10 @@ static int mkv_write_ass_blocks(AVFormatContext *s, AVPacket *pkt)
return max_duration;
}
static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
static void mkv_write_block(AVFormatContext *s, ByteIOContext *pb,
unsigned int blockid, AVPacket *pkt, int flags)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = s->pb;
AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
uint8_t *data = NULL;
int size = pkt->size;
@ -832,6 +832,21 @@ static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *
av_free(data);
}
static void mkv_flush_dynbuf(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
int bufsize;
uint8_t *dyn_buf;
if (!mkv->dyn_bc)
return;
bufsize = url_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
put_buffer(s->pb, dyn_buf, bufsize);
av_free(dyn_buf);
mkv->dyn_bc = NULL;
}
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
@ -841,11 +856,17 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
int duration = pkt->duration;
int ret;
if (url_is_streamed(s->pb)) {
if (!mkv->dyn_bc)
url_open_dyn_buf(&mkv->dyn_bc);
pb = mkv->dyn_bc;
}
if (!mkv->cluster_pos) {
ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
if (ret < 0) return ret;
mkv->cluster_pos = url_ftell(pb);
mkv->cluster_pos = url_ftell(s->pb);
mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
mkv->cluster_pts = pkt->pts;
@ -853,13 +874,13 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
}
if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
} else if (codec->codec_id == CODEC_ID_SSA) {
duration = mkv_write_ass_blocks(s, pkt);
duration = mkv_write_ass_blocks(s, pb, pkt);
} else {
ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
duration = pkt->convergence_duration;
mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0);
mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
end_ebml_master(pb, blockgroup);
}
@ -869,12 +890,15 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
if (ret < 0) return ret;
}
// start a new cluster every 5 MB or 5 sec
if (url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
// start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming
if (url_is_streamed(s->pb) && (url_ftell(pb) > 32*1024 || pkt->pts > mkv->cluster_pts + 1000)
|| url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
" bytes, pts %" PRIu64 "\n", url_ftell(pb), pkt->pts);
end_ebml_master(pb, mkv->cluster);
mkv->cluster_pos = 0;
if (mkv->dyn_bc)
mkv_flush_dynbuf(s);
}
mkv->duration = FFMAX(mkv->duration, pkt->pts + duration);
@ -888,7 +912,12 @@ static int mkv_write_trailer(AVFormatContext *s)
int64_t currentpos, second_seekhead, cuespos;
int ret;
end_ebml_master(pb, mkv->cluster);
if (mkv->dyn_bc) {
end_ebml_master(mkv->dyn_bc, mkv->cluster);
mkv_flush_dynbuf(s);
} else if (mkv->cluster_pos) {
end_ebml_master(pb, mkv->cluster);
}
if (!url_is_streamed(pb)) {
cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);