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attempt to try to generate an random umid 

Originally committed as revision 17932 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2009-03-11 06:15:00 +00:00
parent 00b7fbdcf5
commit cafdc1876a
1 changed files with 32 additions and 8 deletions
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40
libavformat/mxfenc.c
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@ -36,6 +36,7 @@
#include <time.h>
#include "libavutil/fifo.h"
#include "libavutil/random_seed.h"
#include "libavcodec/bytestream.h"
#include "audiointerleave.h"
#include "avformat.h"
@ -187,10 +188,12 @@ typedef struct MXFContext {
int timecode_drop_frame; ///< time code use drop frame method frop mpeg-2 essence gop header
int edit_unit_byte_count; ///< fixed edit unit byte count
uint64_t body_offset;
uint32_t instance_number;
uint8_t umid[16]; ///< unique material identifier
} MXFContext;
static const uint8_t uuid_base[] = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
static const uint8_t umid_base[] = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13,0x00,0x00,0x00 };
static const uint8_t umid_ul[] = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13 };
/**
* complete key for operation pattern, partitions, and primer pack
@ -307,10 +310,13 @@ static void mxf_write_uuid(ByteIOContext *pb, enum MXFMetadataSetType type, int
put_be16(pb, value);
}
static void mxf_write_umid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)
static void mxf_write_umid(AVFormatContext *s, int type)
{
put_buffer(pb, umid_base, 16);
mxf_write_uuid(pb, type, value);
MXFContext *mxf = s->priv_data;
put_buffer(s->pb, umid_ul, 13);
put_be24(s->pb, mxf->instance_number);
put_buffer(s->pb, mxf->umid, 15);
put_buffer(s->pb, mxf->umid, type);
}
static void mxf_write_refs_count(ByteIOContext *pb, int ref_count)
@ -693,7 +699,7 @@ static void mxf_write_structural_component(AVFormatContext *s, AVStream *st, enu
for (i = 0; i < 4; i++)
put_be64(pb, 0);
} else
mxf_write_umid(pb, SourcePackage, 0);
mxf_write_umid(s, 1);
// write source track id
mxf_write_local_tag(pb, 4, 0x1102);
@ -932,7 +938,7 @@ static void mxf_write_package(AVFormatContext *s, enum MXFMetadataSetType type)
// write package umid
mxf_write_local_tag(pb, 32, 0x4401);
mxf_write_umid(pb, type, 0);
mxf_write_umid(s, type == SourcePackage);
PRINT_KEY(s, "package umid second part", pb->buf_ptr - 16);
// package creation date
@ -990,7 +996,7 @@ static int mxf_write_essence_container_data(AVFormatContext *s)
mxf_write_uuid(pb, EssenceContainerData, 0);
mxf_write_local_tag(pb, 32, 0x2701); // Linked Package UID
mxf_write_umid(pb, SourcePackage, 0);
mxf_write_umid(s, 1);
mxf_write_local_tag(pb, 4, 0x3F07); // BodySID
put_be32(pb, 1);
@ -1371,6 +1377,18 @@ static uint64_t mxf_parse_timestamp(time_t timestamp)
time->tm_sec << 8;
}
static void mxf_gen_umid(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
uint32_t seed = ff_random_get_seed();
uint64_t umid = seed + 0x5294713400000000LL;
AV_WB64(mxf->umid , umid);
AV_WB64(mxf->umid+8, umid>>8);
mxf->instance_number = seed;
}
static int mxf_write_header(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
@ -1378,6 +1396,9 @@ static int mxf_write_header(AVFormatContext *s)
uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};
const int *samples_per_frame = NULL;
if (!s->nb_streams)
return -1;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
MXFStreamContext *sc = av_mallocz(sizeof(*sc));
@ -1469,6 +1490,9 @@ static int mxf_write_header(AVFormatContext *s)
mxf->essence_container_count = 1;
}
if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
mxf_gen_umid(s);
for (i = 0; i < s->nb_streams; i++) {
MXFStreamContext *sc = s->streams[i]->priv_data;
// update element count
@ -1555,7 +1579,7 @@ static void mxf_write_system_item(AVFormatContext *s)
klv_encode_ber4_length(pb, 35);
put_byte(pb, 0x83); // UMID
put_be16(pb, 0x20);
mxf_write_umid(pb, SourcePackage, 0);
mxf_write_umid(s, 1);
}
static void mxf_write_d10_video_packet(AVFormatContext *s, AVStream *st, AVPacket *pkt)