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lavf/matroskaenc: respect bitexact for attachments.

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Use the first 64 bits of the SHA1 of the content as file UID
instead of a random number if the bitexact flag is set.
This commit is contained in:
Nicolas George 2013-01-01 14:14:43 +01:00
parent 5bab99baea
commit 8dbbaf568e
1 changed files with 19 additions and 1 deletions
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20
libavformat/matroskaenc.c
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@ -28,6 +28,7 @@
#include "flacenc.h"
#include "avlanguage.h"
#include "libavutil/samplefmt.h"
#include "libavutil/sha.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/mathematics.h"
@ -856,6 +857,7 @@ static int mkv_write_attachments(AVFormatContext *s)
ebml_master attached_file;
AVDictionaryEntry *t;
const char *mimetype = NULL;
uint64_t fileuid;
if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
continue;
@ -885,9 +887,25 @@ static int mkv_write_attachments(AVFormatContext *s)
return AVERROR(EINVAL);
}
if (st->codec->flags & CODEC_FLAG_BITEXACT) {
struct AVSHA *sha = av_sha_alloc();
uint8_t digest[20];
if (!sha)
return AVERROR(ENOMEM);
av_sha_init(sha, 160);
av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
av_sha_final(sha, digest);
av_free(sha);
fileuid = AV_RL64(digest);
} else {
fileuid = av_lfg_get(&c);
}
av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
fileuid, i);
put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
end_ebml_master(pb, attached_file);
}
end_ebml_master(pb, attachments);