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delay header writing and parse mpeg2 frame

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Originally committed as revision 16888 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2009-01-31 06:32:12 +00:00
parent cc812c8c7e
commit 7c7c1a76db
1 changed files with 34 additions and 16 deletions
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48
libavformat/mxfenc.c
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@ -91,6 +91,7 @@ typedef struct MXFContext {
int essence_container_count;
uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];
AVRational time_base;
int header_written;
} MXFContext;
static const uint8_t uuid_base[] = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
@ -797,6 +798,26 @@ static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)
return NULL;
}
static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
MXFStreamContext *sc = st->priv_data;
uint32_t c = -1;
int i;
for(i = 0; i < pkt->size - 4; i++) {
c = (c<<8) + pkt->data[i];
if (c == 0x1B5) {
if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext
st->codec->profile = pkt->data[i+1] & 0x07;
st->codec->level = pkt->data[i+2] >> 4;
break;
}
}
}
sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);
return !!sc->codec_ul;
}
static int ff_audio_interleave_init(AVFormatContext *s, const int *samples_per_frame)
{
int i;
@ -865,19 +886,6 @@ static int mxf_write_header(AVFormatContext *s)
return -1;
}
if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
if (st->codec->profile == FF_PROFILE_UNKNOWN ||
st->codec->level == FF_LEVEL_UNKNOWN) {
av_log(s, AV_LOG_ERROR, "track %d: profile and level must be set for mpeg-2\n", i);
return -1;
}
sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);
if (!sc->codec_ul) {
av_log(s, AV_LOG_ERROR, "track %d: could not find codec ul for mpeg-2, "
"unsupported profile/level\n", i);
return -1;
}
} else
sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;
if (!present[sc->index]) {
@ -901,17 +909,27 @@ static int mxf_write_header(AVFormatContext *s)
if (ff_audio_interleave_init(s, samples_per_frame) < 0)
return -1;
mxf_write_partition(s, 1, header_open_partition_key, 1);
return 0;
}
static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
AVStream *st = s->streams[pkt->stream_index];
MXFStreamContext *sc = st->priv_data;
if (!mxf->header_written) {
if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
if (!mxf_parse_mpeg2_frame(s, st, pkt)) {
av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");
return -1;
}
}
mxf_write_partition(s, 1, header_open_partition_key, 1);
mxf->header_written = 1;
}
put_buffer(pb, sc->track_essence_element_key, 16); // write key
klv_encode_ber_length(pb, pkt->size); // write length
put_buffer(pb, pkt->data, pkt->size); // write value