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write system item

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Originally committed as revision 17033 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2009-02-08 02:34:56 +00:00
parent 88b2027e9a
commit 67d8ac4a02
1 changed files with 80 additions and 5 deletions
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85
libavformat/mxfenc.c
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@ -870,7 +870,7 @@ static int mxf_write_index_table_segment(AVFormatContext *s)
av_log(s, AV_LOG_DEBUG, "edit units count %d\n", mxf->edit_units_count);
put_buffer(pb, index_table_segment_key, 16);
ret = klv_encode_ber_length(pb, 109 + s->nb_streams*6 +
ret = klv_encode_ber_length(pb, 109 + (s->nb_streams+1)*6 +
mxf->edit_units_count*(11+(s->nb_streams-1)*4));
// instance id
@ -907,9 +907,13 @@ static int mxf_write_index_table_segment(AVFormatContext *s)
put_byte(pb, s->nb_streams-1);
// delta entry array
mxf_write_local_tag(pb, 8 + s->nb_streams*6, 0x3F09);
put_be32(pb, s->nb_streams); // num of entries
mxf_write_local_tag(pb, 8 + (s->nb_streams+1)*6, 0x3F09);
put_be32(pb, s->nb_streams+1); // num of entries
put_be32(pb, 6); // size of one entry
// write system item delta entry
put_byte(pb, 0);
put_byte(pb, 0); // slice entry
put_be32(pb, 0); // element delta
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
MXFStreamContext *sc = st->priv_data;
@ -917,7 +921,10 @@ static int mxf_write_index_table_segment(AVFormatContext *s)
if (sc->temporal_reordering)
temporal_reordering = 1;
put_byte(pb, i);
put_be32(pb, 0); // element delta
if (mxf->edit_unit_start)
put_be32(pb, KAG_SIZE); // system item size including klv fill
else
put_be32(pb, 0); // element delta
}
mxf_write_local_tag(pb, 8 + mxf->edit_units_count*(11+(s->nb_streams-1)*4), 0x3F0A);
@ -1248,6 +1255,70 @@ static void mxf_write_klv_fill(AVFormatContext *s)
}
}
static const uint8_t system_metadata_pack_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x01,0x00 };
static const uint8_t system_metadata_package_set_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x43,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x02,0x01 };
static uint32_t ff_framenum_to_12m_time_code(unsigned frame, int drop, int fps)
{
return (0 << 31) | // color frame flag
(0 << 30) | // drop frame flag
( ((frame % fps) / 10) << 28) | // tens of frames
( ((frame % fps) % 10) << 24) | // units of frames
(0 << 23) | // field phase (NTSC), b0 (PAL)
((((frame / fps) % 60) / 10) << 20) | // tens of seconds
((((frame / fps) % 60) % 10) << 16) | // units of seconds
(0 << 15) | // b0 (NTSC), b2 (PAL)
((((frame / (fps * 60)) % 60) / 10) << 12) | // tens of minutes
((((frame / (fps * 60)) % 60) % 10) << 8) | // units of minutes
(0 << 7) | // b1
(0 << 6) | // b2 (NSC), field phase (PAL)
((((frame / (fps * 3600) % 24)) / 10) << 4) | // tens of hours
( (frame / (fps * 3600) % 24)) % 10; // units of hours
}
static void mxf_write_system_item(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
unsigned fps, frame;
uint32_t time_code;
frame = mxf->edit_units_count;
// write system metadata pack
put_buffer(pb, system_metadata_pack_key, 16);
klv_encode_ber_length(pb, 57);
put_byte(pb, 0x5c); // UL, user date/time stamp, picture and sound item present
put_byte(pb, 0x04); // content package rate
put_byte(pb, 0x00); // content package type
put_be16(pb, 0x00); // channel handle
put_be16(pb, frame); // continuity count
if (mxf->essence_container_count > 1)
put_buffer(pb, multiple_desc_ul, 16);
else
put_buffer(pb, mxf_essence_container_uls[mxf->essence_containers_indices[0]].container_ul, 16);
put_byte(pb, 0);
put_be64(pb, 0);
put_be64(pb, 0); // creation date/time stamp
// XXX drop frame
if (mxf->time_base.den == 30000) fps = 30;
else fps = 25;
put_byte(pb, 0x81); // SMPTE 12M time code
time_code = ff_framenum_to_12m_time_code(frame, 0, fps);
put_be32(pb, time_code);
put_be32(pb, 0); // binary group data
put_be64(pb, 0);
// write system metadata package set
put_buffer(pb, system_metadata_package_set_key, 16);
klv_encode_ber_length(pb, 35);
put_byte(pb, 0x83); // UMID
put_be16(pb, 0x20);
mxf_write_umid(pb, SourcePackage, 0);
}
static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
MXFContext *mxf = s->priv_data;
@ -1282,6 +1353,10 @@ static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
if (st->index == mxf->edit_unit_start) {
mxf->index_entries[mxf->edit_units_count].offset = url_ftell(pb);
mxf->index_entries[mxf->edit_units_count].slice_offset[st->index] = 0;
mxf_write_system_item(s);
mxf_write_klv_fill(s);
mxf->edit_units_count++;
} else {
mxf->index_entries[mxf->edit_units_count-1].slice_offset[st->index] =
@ -1321,7 +1396,7 @@ static int mxf_write_footer(AVFormatContext *s)
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
unsigned index_byte_count =
109 + s->nb_streams*6 +
109 + (s->nb_streams+1)*6 +
mxf->edit_units_count*(11+(s->nb_streams-1)*4);
// add encoded ber length