Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

write system item

Browse Source 
Originally committed as revision 17033 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Baptiste Coudurier 16 years ago
parent 88b2027e9a
commit 67d8ac4a02
1 changed files with 80 additions and 5 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 85
      libavformat/mxfenc.c

85
libavformat/mxfenc.c
Unescape View File

@ -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

Write Preview
Loading…
Cancel
Save