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Code Issues Releases Activity

exactly compute index byte count

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Originally committed as revision 16981 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2009-02-03 23:11:13 +00:00
parent 5363c43ea8
commit 832404cea7
1 changed files with 13 additions and 6 deletions
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19
libavformat/mxfenc.c
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@ -929,7 +929,8 @@ static int mxf_write_index_table_segment(AVFormatContext *s)
return ret;
}
static void mxf_write_partition(AVFormatContext *s, int bodysid, int indexsid,
static void mxf_write_partition(AVFormatContext *s, int bodysid,
int indexsid, unsigned index_byte_count,
const uint8_t *key, int write_metadata)
{
MXFContext *mxf = s->priv_data;
@ -956,8 +957,7 @@ static void mxf_write_partition(AVFormatContext *s, int bodysid, int indexsid,
put_be64(pb, 0); // headerByteCount, update later
// indexTable
put_be64(pb, indexsid ? 19 + 109 + s->nb_streams*6 +
mxf->edit_units_count*(11+(s->nb_streams-1)*4) : 0); // indexByteCount
put_be64(pb, index_byte_count); // indexByteCount
put_be32(pb, indexsid); // indexSID
put_be64(pb, 0); // bodyOffset
@ -1199,7 +1199,7 @@ static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
}
if (!mxf->header_written) {
mxf_write_partition(s, 1, 0, header_open_partition_key, 1);
mxf_write_partition(s, 1, 0, 0, header_open_partition_key, 1);
mxf->header_written = 1;
}
@ -1244,9 +1244,16 @@ 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 +
mxf->edit_units_count*(11+(s->nb_streams-1)*4);
// add encoded ber length
index_byte_count += 16 +
(index_byte_count < 128 ? 1 : (av_log2(index_byte_count) >> 3) + 2);
mxf->footer_partition_offset = url_ftell(pb);
mxf_write_partition(s, 0, 2, footer_partition_key, 0);
mxf_write_partition(s, 0, 2, index_byte_count, footer_partition_key, 0);
mxf_write_index_table_segment(s);
@ -1254,7 +1261,7 @@ static int mxf_write_footer(AVFormatContext *s)
if (!url_is_streamed(s->pb)) {
url_fseek(pb, 0, SEEK_SET);
mxf_write_partition(s, 1, 0, header_closed_partition_key, 1);
mxf_write_partition(s, 1, 0, 0, header_closed_partition_key, 1);
}
ff_audio_interleave_close(s);