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added function to parse vc1 sequence header

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21965 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
nicodvb 2007-01-20 12:04:20 +00:00
parent db6e74fe44
commit 58c3d666eb
2 changed files with 116 additions and 0 deletions
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115
libmpdemux/mpeg_hdr.c
View File

@ -4,6 +4,7 @@
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "mpeg_hdr.h"
@ -158,7 +159,16 @@ unsigned char mp_getbits(unsigned char *buffer, unsigned int from, unsigned char
return y;
}
static inline unsigned int mp_getbits16(unsigned char *buffer, unsigned int from, unsigned char len)
{
if(len > 8)
return (mp_getbits(buffer, from, len - 8) << 8) | mp_getbits(buffer, from + len - 8, 8);
else
return mp_getbits(buffer, from, len);
}
#define getbits mp_getbits
#define getbits16 mp_getbits16
static int read_timeinc(mp_mpeg_header_t * picture, unsigned char * buffer, int n)
{
@ -409,3 +419,108 @@ int h264_parse_sps(mp_mpeg_header_t * picture, unsigned char * buf, int len)
free(dest);
return n;
}
static int mp_unescape03(unsigned char *buf, int len)
{
unsigned char *dest;
int i, j, skip;
dest = malloc(len);
if(! dest)
return 0;
j = i = skip = 0;
while(i <= len-3)
{
if(buf[i] == 0 && buf[i+1] == 0 && buf[i+2] == 3)
{
dest[j] = dest[j+1] = 0;
j += 2;
i += 3;
skip++;
}
else
{
dest[j] = buf[i];
j++;
i++;
}
}
dest[j] = buf[len-2];
dest[j+1] = buf[len-1];
len -= skip;
memcpy(buf, dest, len);
free(dest);
return len;
}
int mp_vc1_decode_sequence_header(mp_mpeg_header_t * picture, unsigned char * buf, int len)
{
int n, x;
len = mp_unescape03(buf, len);
picture->display_picture_width = picture->display_picture_height = 0;
picture->fps = 0;
n = 0;
x = getbits(buf, n, 2);
n += 2;
if(x != 3) //not advanced profile
return 0;
getbits16(buf, n, 14);
n += 14;
picture->display_picture_width = getbits16(buf, n, 12) * 2 + 2;
n += 12;
picture->display_picture_height = getbits16(buf, n, 12) * 2 + 2;
n += 12;
getbits(buf, n, 6);
n += 6;
x = getbits(buf, n, 1);
n += 1;
if(x) //display info
{
getbits16(buf, n, 14);
n += 14;
getbits16(buf, n, 14);
n += 14;
if(getbits(buf, n++, 1)) //aspect ratio
{
x = getbits(buf, n, 4);
n += 4;
if(x == 15)
{
getbits16(buf, n, 16);
n += 16;
}
}
if(getbits(buf, n++, 1)) //framerates
{
int frexp=0, frnum=0, frden=0;
if(getbits(buf, n++, 1))
{
frexp = getbits16(buf, n, 16);
n += 16;
picture->fps = (double) (frexp+1) / 32.0;
}
else
{
float frates[] = {0, 24000, 25000, 30000, 50000, 60000, 48000, 72000, 0};
float frdivs[] = {0, 1000, 1001, 0};
frnum = getbits(buf, n, 8);
n += 8;
frden = getbits(buf, n, 4);
n += 4;
if((frden == 1 || frden == 2) && (frnum < 8))
picture->fps = frates[frnum] / frdivs[frden];
}
}
}
//free(dest);
return 1;
}

1
libmpdemux/mpeg_hdr.h
View File

@ -26,3 +26,4 @@ float mpeg12_aspect_info(mp_mpeg_header_t *picture);
int mp4_header_process_vol(mp_mpeg_header_t * picture, unsigned char * buffer);
void mp4_header_process_vop(mp_mpeg_header_t * picture, unsigned char * buffer);
int h264_parse_sps(mp_mpeg_header_t * picture, unsigned char * buf, int len);
int mp_vc1_decode_sequence_header(mp_mpeg_header_t * picture, unsigned char * buf, int len);