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export custom mp_a52_framesize(), needed to parse ac3 frames when liba52 is not present; will be moved in a more appropriate place sometimes in the future

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17493 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
nicodvb 2006-01-27 23:07:16 +00:00
parent f5cf39d015
commit 3ba7533cca
1 changed files with 6 additions and 3 deletions
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9
libmpdemux/demux_ts.c
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@ -464,7 +464,7 @@ typedef struct {
//stripped down version of a52_syncinfo() from liba52
//copyright belongs to Michel Lespinasse <walken@zoy.org> and Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
static int a52_framesize(uint8_t * buf)
int mp_a52_framesize(uint8_t * buf, int *srate)
{
int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
128, 160, 192, 224, 256, 320, 384, 448,
@ -490,10 +490,13 @@ static int a52_framesize(uint8_t * buf)
switch(buf[4] & 0xc0)
{
case 0: /* 48 KHz */
*srate = 48000 >> half;
return 4 * bitrate;
case 0x40: /* 44.1 KHz */
*srate = 44100 >> half;
return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
case 0x80: /* 32 KHz */
*srate = 32000 >> half;
return 6 * bitrate;
}
@ -503,7 +506,7 @@ static int a52_framesize(uint8_t * buf)
//second stage: returns the count of A52 syncwords found
static int a52_check(char *buf, int len)
{
int cnt, frame_length, ok;
int cnt, frame_length, ok, srate;
cnt = ok = 0;
if(len < 8)
@ -513,7 +516,7 @@ static int a52_check(char *buf, int len)
{
if(buf[cnt] == 0x0B && buf[cnt+1] == 0x77)
{
frame_length = a52_framesize(&buf[cnt]);
frame_length = mp_a52_framesize(&buf[cnt], &srate);
if(frame_length>=7 && frame_length<=3840)
{
cnt += frame_length;