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occasional mp3 click noises fixed

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@530 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-07-06 20:28:11 +00:00
parent 8fc24df108
commit 6e507f764b
2 changed files with 55 additions and 9 deletions
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52
common/mp3_helix.c
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@ -15,13 +15,40 @@ static HMP3Decoder mp3dec = 0;
static int mp3_buffer_offs = 0;
static int find_sync_word(unsigned char *buf, int nBytes)
{
unsigned char *p, *pe;
/* find byte-aligned syncword - need 12 (MPEG 1,2) or 11 (MPEG 2.5) matching bits */
for (p = buf, pe = buf + nBytes - 4; p < pe; p++)
{
int pn;
if (p[0] != 0xff) continue;
pn = p[1];
if ((pn & 0xf8) != 0xf8 || // currently must be MPEG1
(pn & 6) == 0) { // invalid layer
p++; continue;
}
pn = p[2];
if ((pn & 0xf0) < 0x20 || (pn & 0xf0) == 0xf0 || // bitrates
(pn & 0x0c) != 0) { // not 44kHz
continue;
}
return p - buf;
}
return -1;
}
static int try_get_header(unsigned char *buff, MP3FrameInfo *fi)
{
int ret, offs1, offs = 0;
while (1)
{
offs1 = MP3FindSyncWord(buff + offs, 2048 - offs);
offs1 = find_sync_word(buff + offs, 2048 - offs);
if (offs1 < 0) return -2;
offs += offs1;
if (2048 - offs < 4) return -3;
@ -44,7 +71,8 @@ int mp3_get_bitrate(FILE *f, int len)
memset(buff, 0, 2048);
if (!mp3dec) mp3dec = MP3InitDecoder();
if (mp3dec) MP3FreeDecoder(mp3dec);
mp3dec = MP3InitDecoder();
fseek(f, 0, SEEK_SET);
ret = fread(buff, 1, 2048, f);
@ -81,11 +109,12 @@ static int mp3_decode(void)
unsigned char *readPtr = mp3_mem + mp3_offs;
int bytesLeft = shared_ctl->mp3_len - mp3_offs;
int offset; // frame offset from readPtr
int err;
int retries = 0, err;
if (bytesLeft <= 0) return 1; // EOF, nothing to do
offset = MP3FindSyncWord(readPtr, bytesLeft);
retry:
offset = find_sync_word(readPtr, bytesLeft);
if (offset < 0) {
shared_ctl->mp3_offs = shared_ctl->mp3_len;
return 1; // EOF
@ -102,6 +131,9 @@ static int mp3_decode(void)
// ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
// just try to skip the offending frame..
readPtr++;
bytesLeft--;
if (retries++ < 2) goto retry;
else lprintf("mp3 decode failed with %i after %i retries\n", err, retries);
}
shared_ctl->mp3_errors++;
shared_ctl->mp3_lasterr = err;
@ -112,6 +144,10 @@ static int mp3_decode(void)
void mp3_start_local(void)
{
// must re-init decoder for new track
if (mp3dec) MP3FreeDecoder(mp3dec);
mp3dec = MP3InitDecoder();
mp3_buffer_offs = 0;
mp3_decode();
}
@ -138,9 +174,9 @@ static int mp3_decode(void)
fseek(mp3_current_file, mp3_file_pos, SEEK_SET);
bytesLeft = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), mp3_current_file);
offset = MP3FindSyncWord(mp3_input_buffer, bytesLeft);
offset = find_sync_word(mp3_input_buffer, bytesLeft);
if (offset < 0) {
//lprintf("MP3FindSyncWord (%i/%i) err %i\n", mp3_file_pos, mp3_file_len, offset);
//lprintf("find_sync_word (%i/%i) err %i\n", mp3_file_pos, mp3_file_len, offset);
mp3_file_pos = mp3_file_len;
return 1; // EOF
}
@ -179,6 +215,10 @@ void mp3_start_play(FILE *f, int pos)
mp3_current_file = NULL;
mp3_buffer_offs = 0;
// must re-init decoder for new track
if (mp3dec) MP3FreeDecoder(mp3dec);
mp3dec = MP3InitDecoder();
if (!(PicoOpt&POPT_EN_MCD_CDDA) || f == NULL) // cdda disabled or no file?
return;