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implement ADCTRL_RESYNC_STREAM, it tries to detect when decoding is

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"reliable" again.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16745 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2005-10-12 21:49:47 +00:00
parent 379f66aedc
commit 2465a2037d
1 changed files with 34 additions and 0 deletions
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34
libmpcodecs/ad_mpc.c
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@ -31,6 +31,10 @@ LIBAD_EXTERN(libmusepack)
// BUFFER_LENGTH is in MPC_SAMPLE_FORMAT units
#define MAX_FRAMESIZE (4 * MPC_DECODER_BUFFER_LENGTH)
//! this many frames should decode good after seeking
#define MIN_SEEK_GOOD 5
//! how many frames to discard at most after seeking
#define MAX_SEEK_DISCARD 50
typedef struct context_s {
char *header;
@ -178,7 +182,37 @@ static int decode_audio(sh_audio_t *sh, unsigned char *buf,
return status;
}
/**
* \brief check if the decoded values are in a sane range
* \param buf decoded buffer
* \param len length of buffer in bytes
* \return 1 if all values are in (-1.01, 1.01) range, 0 otherwise
*/
static int check_clip(void *buf, int len) {
#if MPC_SAMPLE_FORMAT == float
float *p = buf;
if (len < 4) return 1;
len = -len / 4;
p = &p[-len];
do {
if (p[len] < -1 || p[len] > 1) return 0;
} while (++len);
#endif
return 1;
}
static int control(sh_audio_t *sh, int cmd, void* arg, ...) {
if (cmd == ADCTRL_RESYNC_STREAM) {
unsigned char *buf = (unsigned char *)malloc(MAX_FRAMESIZE);
int i;
int nr_ok = 0;
for (i = 0; i < MAX_SEEK_DISCARD; i++) {
int len = decode_audio(sh, buf, 0, MAX_FRAMESIZE);
if (check_clip(buf, len)) nr_ok++; else nr_ok = 0;
if (nr_ok > MIN_SEEK_GOOD) break;
}
free(buf);
}
return CONTROL_UNKNOWN;
}