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Code Issues Releases Activity

simplify and correctly rewrite metadata in header partition, mark it closed complete

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Originally committed as revision 15106 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2008-08-31 03:36:25 +00:00
parent ca276e6ae2
commit cc98406051
1 changed files with 26 additions and 44 deletions
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70
libavformat/mxfenc.c
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@ -65,9 +65,8 @@ static const MXFContainerEssencePair mxf_essence_container_uls[] = {
};
typedef struct MXFContext {
int64_t header_byte_count;
int64_t header_byte_count_offset;
int64_t header_footer_partition_offset;
int64_t footer_partition_offset;
int essence_container_count;
uint8_t essence_containers_indices[sizeof(mxf_essence_container_uls)/
sizeof(*mxf_essence_container_uls)];
@ -678,7 +677,7 @@ static int mxf_write_header_metadata_sets(AVFormatContext *s)
return 0;
}
static void mxf_write_partition(AVFormatContext *s, int64_t byte_position, int bodysid, const uint8_t *key)
static void mxf_write_partition(AVFormatContext *s, int bodysid, const uint8_t *key, int write_metadata)
{
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
@ -696,14 +695,10 @@ static void mxf_write_partition(AVFormatContext *s, int64_t byte_position, int b
put_be64(pb, url_ftell(pb) - 25); // thisPartition
put_be64(pb, 0); // previousPartition
// set offset
if (!byte_position)
mxf->header_footer_partition_offset = url_ftell(pb);
put_be64(pb, byte_position); // footerPartition,update later
put_be64(pb, mxf->footer_partition_offset); // footerPartition
// set offset
if (!byte_position)
mxf->header_byte_count_offset = url_ftell(pb);
mxf->header_byte_count_offset = url_ftell(pb);
put_be64(pb, 0); // headerByteCount, update later
// no indexTable
@ -716,6 +711,20 @@ static void mxf_write_partition(AVFormatContext *s, int64_t byte_position, int b
// essence container
mxf_write_essence_container_refs(s);
if (write_metadata) {
// mark the start of the headermetadata and calculate metadata size
int64_t pos, start = url_ftell(s->pb);
mxf_write_primer_pack(s);
mxf_write_header_metadata_sets(s);
pos = url_ftell(s->pb);
// update header_byte_count
url_fseek(pb, mxf->header_byte_count_offset, SEEK_SET);
put_be64(pb, pos - start);
url_fseek(pb, pos, SEEK_SET);
}
put_flush_packet(pb);
}
static const UID mxf_mpeg2_codec_uls[] = {
@ -756,8 +765,6 @@ static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)
static int mxf_write_header(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
int64_t header_metadata_start, offset_now;
int i, index;
uint8_t present[sizeof(mxf_essence_container_uls)/
sizeof(*mxf_essence_container_uls)] = {0};
@ -807,25 +814,9 @@ static int mxf_write_header(AVFormatContext *s)
PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);
}
mxf_write_partition(s, 0, 1, header_open_partition_key);
mxf_write_partition(s, 1, header_open_partition_key, 1);
// mark the start of the headermetadata and calculate metadata size
header_metadata_start = url_ftell(s->pb);
mxf_write_primer_pack(s);
if (mxf_write_header_metadata_sets(s) < 0)
goto fail;
offset_now = url_ftell(s->pb);
mxf->header_byte_count = offset_now - header_metadata_start;
// update header_byte_count
url_fseek(pb, mxf->header_byte_count_offset, SEEK_SET);
put_be64(pb, mxf->header_byte_count);
url_fseek(pb, offset_now, SEEK_SET);
put_flush_packet(pb);
return 0;
fail:
mxf_free(s);
return -1;
}
static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
@ -844,26 +835,17 @@ static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
return 0;
}
static void mxf_update_header_partition(AVFormatContext *s, int64_t footer_partition_offset)
static int mxf_write_footer(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
url_fseek(pb, mxf->header_footer_partition_offset, SEEK_SET);
put_be64(pb, footer_partition_offset);
put_flush_packet(pb);
}
static int mxf_write_footer(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
int64_t byte_position= url_ftell(pb);
mxf_write_partition(s, byte_position, 0, footer_partition_key);
put_flush_packet(pb);
if (!url_is_streamed(s->pb))
mxf_update_header_partition(s, byte_position);
mxf->footer_partition_offset = url_ftell(pb);
mxf_write_partition(s, 0, footer_partition_key, 0);
if (!url_is_streamed(s->pb)) {
url_fseek(pb, 0, SEEK_SET);
mxf_write_partition(s, 1, header_closed_partition_key, 1);
}
mxf_free(s);
return 0;
}