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fixing msmpeg4 decoding if fps < 16 (i thought it was a indicator for the ext header, its the fps indeed) 

Originally committed as revision 313 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-02-22 19:19:01 +00:00
parent 81b7c056ee
commit 2b9ab1d54a
3 changed files with 16 additions and 34 deletions
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2
libavcodec/h263dec.c
View File

@ -214,7 +214,7 @@ static int h263_decode_frame(AVCodecContext *avctx,
}
}
if (s->h263_msmpeg4)
if (s->h263_msmpeg4 && s->pict_type==I_TYPE)
if(msmpeg4_decode_ext_header(s, buf_size) < 0) return -1;
MPV_frame_end(s);

2
libavcodec/mpegvideo.c
View File

@ -1128,7 +1128,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
}
}
if (s->h263_msmpeg4)
if (s->h263_msmpeg4 && s->pict_type == I_TYPE)
msmpeg4_encode_ext_header(s);
//if (s->gob_number)

46
libavcodec/msmpeg4.c
View File

@ -21,6 +21,7 @@
#include "common.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "avcodec.h"
/*
* You can also call this codec : MPEG4 with a twist !
@ -212,23 +213,14 @@ void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
void msmpeg4_encode_ext_header(MpegEncContext * s)
{
if(s->pict_type == P_TYPE)
{
return; // P-Frames dont seem to have them and not even a 0 bit
}
else
{
s->flipflop_rounding=1;
s->bitrate= 910;
s->bitrate= 910; // FIXME
put_bits(&s->pb, 1, 1); // ext header indicator
put_bits(&s->pb, 4, 7); // ?
put_bits(&s->pb, 5, s->frame_rate / FRAME_RATE_BASE); //yes 29.97 -> 29
put_bits(&s->pb, 11, s->bitrate);
put_bits(&s->pb, 1, s->flipflop_rounding);
}
}
/* predict coded block */
@ -748,33 +740,23 @@ int msmpeg4_decode_picture_header(MpegEncContext * s)
int msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
{
int firstBit=0;
/* the alt_bitstream reader could read over the end so we need to check it */
if(get_bits_count(&s->gb) < buf_size*8) firstBit= get_bits1(&s->gb);
if(s->pict_type == P_TYPE)
if(get_bits_count(&s->gb) + 16 < buf_size*8)
{
if(firstBit) return -1; // havnt seen ext headers in P-Frames yet ;)
int fps;
fps= get_bits(&s->gb, 5);
s->bitrate= get_bits(&s->gb, 11);
s->flipflop_rounding= get_bits1(&s->gb);
// printf("fps:%2d bps:%2d roundingType:%1d\n", fps, s->bitrate, s->flipflop_rounding);
}
else
{
int unk;
if(!firstBit) // no header found
{
s->flipflop_rounding= 0;
s->bitrate= 0;
return 0;
}
unk= get_bits(&s->gb, 4);
s->bitrate= get_bits(&s->gb, 11);
// printf("%2d %4d ;; %1X\n", unk,s->bitrate, unk);
s->flipflop_rounding= get_bits1(&s->gb);
s->flipflop_rounding= 0;
s->bitrate= 0;
}
return 0;
}