videolan/ffmpeg
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2 byte shorter userdata for mpeg4

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in the past it was startcode,string,00,7F,startcode
now it is startcode,string,stratcode
both are mpeg4 compliant, as according to the standard the userdata lasts until the next 00 00 01 (startcode prefix) but some very primitive decoders which simply skip until the first 00 byte and then expect the next valid startcode might fail with the old variant, just a theory though (didnt test if quicktime can decode it now)

Originally committed as revision 2767 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-02-08 22:52:35 +00:00
parent f02ab8148c
commit 99683a3077
4 changed files with 8 additions and 8 deletions
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5
libavcodec/common.c
View File

@ -104,13 +104,14 @@ void flush_put_bits(PutBitContext *s)
#ifdef CONFIG_ENCODERS
void put_string(PutBitContext * pbc, char *s)
void put_string(PutBitContext * pbc, char *s, int put_zero)
{
while(*s){
put_bits(pbc, 8, *s);
s++;
}
put_bits(pbc, 8, 0);
if(put_zero)
put_bits(pbc, 8, 0);
}
/* bit input functions */

4
libavcodec/common.h
View File

@ -291,7 +291,7 @@ void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size);
int put_bits_count(PutBitContext *s);
void align_put_bits(PutBitContext *s);
void flush_put_bits(PutBitContext *s);
void put_string(PutBitContext * pbc, char *s);
void put_string(PutBitContext * pbc, char *s, int put_zero);
/* bit input */
@ -1142,7 +1142,7 @@ uint64_t tstart= rdtsc();\
#define STOP_TIMER(id) \
tend= rdtsc();\
if(tcount<2 || tend - tstart < 4*tsum/tcount){\
if(tcount<2 || tend - tstart < 8*tsum/tcount){\
tsum+= tend - tstart;\
tcount++;\
}else\

3
libavcodec/h263.c
View File

@ -2326,8 +2326,7 @@ static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_n
if(!(s->flags & CODEC_FLAG_BITEXACT)){
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, 0x1B2); /* user_data */
put_string(&s->pb, LIBAVCODEC_IDENT);
ff_mpeg4_stuffing(&s->pb);
put_string(&s->pb, LIBAVCODEC_IDENT, 0);
}
}

4
libavcodec/mjpeg.c
View File

@ -378,7 +378,7 @@ static void jpeg_put_comments(MpegEncContext *s)
/* JFIF header */
put_marker(p, APP0);
put_bits(p, 16, 16);
put_string(p, "JFIF"); /* this puts the trailing zero-byte too */
put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
put_bits(p, 16, 0x0201); /* v 1.02 */
put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
@ -393,7 +393,7 @@ static void jpeg_put_comments(MpegEncContext *s)
flush_put_bits(p);
ptr = pbBufPtr(p);
put_bits(p, 16, 0); /* patched later */
put_string(p, LIBAVCODEC_IDENT);
put_string(p, LIBAVCODEC_IDENT, 1);
size = strlen(LIBAVCODEC_IDENT)+3;
ptr[0] = size >> 8;
ptr[1] = size;