/* this is called for each file to process */
enum codec_status codec_run(void)
{
uint32_t decodedsamples;
size_t n;
int bufcount;
int endofstream;
unsigned char *buf;
uint8_t *wavbuf;
off_t firstblockposn; /* position of the first block in file */
const struct pcm_codec *codec;
uint32_t size;
intptr_t param;
if (codec_init()) {
DEBUGF("codec_init() error\n");
return CODEC_ERROR;
}
codec_set_replaygain(ci->id3);
/* Need to save offset for later use (cleared indirectly by advance_buffer) */
bytesdone = ci->id3->offset;
/* get RIFF chunk header */
ci->seek_buffer(0);
buf = ci->request_buffer(&n, 12);
if (n < 12) {
DEBUGF("request_buffer error\n");
return CODEC_ERROR;
}
if ((memcmp(buf, "RIFF", 4) != 0) || (memcmp(&buf[8], "WAVE", 4) != 0)) {
DEBUGF("CODEC_ERROR: missing riff header\n");
return CODEC_ERROR;
}
/* advance to first WAVE chunk */
ci->advance_buffer(12);
firstblockposn = 12;
ci->memset(&format, 0, sizeof(struct pcm_format));
format.is_signed = true;
format.is_little_endian = true;
decodedsamples = 0;
codec = 0;
/* iterate over WAVE chunks until the 'data' chunk, which should be after the 'fmt ' chunk */
while (true) {
/* get WAVE chunk header */
buf = ci->request_buffer(&n, 1024);
if (n < 8) {
DEBUGF("data chunk request_buffer error\n");
/* no more chunks, 'data' chunk must not have been found */
return CODEC_ERROR;
}
/* chunkSize */
size = (buf[4]|(buf[5]<<8)|(buf[6]<<16)|(buf[7]<<24));
if (memcmp(buf, "fmt ", 4) == 0) {
if (size < 16) {
DEBUGF("CODEC_ERROR: 'fmt ' chunk size=%lu < 16\n",
(unsigned long)size);
return CODEC_ERROR;
}
/* wFormatTag */
format.formattag=buf[8]|(buf[9]<<8);
/* wChannels */
format.channels=buf[10]|(buf[11]<<8);
/* skipping dwSamplesPerSec */
/* skipping dwAvgBytesPerSec */
/* wBlockAlign */
format.blockalign=buf[20]|(buf[21]<<8);
/* wBitsPerSample */
format.bitspersample=buf[22]|(buf[23]<<8);
if (format.formattag != WAVE_FORMAT_PCM) {
if (size < 18) {
/* this is not a fatal error with some formats,
* we'll see later if we can't decode it */
DEBUGF("CODEC_WARNING: non-PCM WAVE (formattag=0x%x) "
"doesn't have ext. fmt descr (chunksize=%d<18).\n",
(unsigned int)format.formattag, (int)size);
}
else
{
if (format.formattag != WAVE_FORMAT_EXTENSIBLE)
format.samplesperblock = buf[26]|(buf[27]<<8);
else
{
format.size = buf[24]|(buf[25]<<8);
if (format.size < 22) {
DEBUGF("CODEC_ERROR: WAVE_FORMAT_EXTENSIBLE is "
"missing extension\n");
return CODEC_ERROR;
}
/* wValidBitsPerSample */
format.bitspersample = buf[26]|(buf[27]<<8);
/* skipping dwChannelMask (4bytes) */
/* SubFormat (only get the first two bytes) */
format.formattag = buf[32]|(buf[33]<<8);
}
}
}
/* msadpcm specific */
if (format.formattag == WAVE_FORMAT_ADPCM)
{
if (!set_msadpcm_coeffs(buf))
{
return CODEC_ERROR;
}
}
/* get codec */
codec = get_wave_codec(format.formattag);
if (!codec)
{
DEBUGF("CODEC_ERROR: unsupported wave format 0x%x\n",
(unsigned int) format.formattag);
return CODEC_ERROR;
}
/* riff 8bit linear pcm is unsigned */
if (format.formattag == WAVE_FORMAT_PCM && format.bitspersample == 8)
format.is_signed = false;
/* set format, parse codec specific tag, check format, and calculate chunk size */
if (!codec->set_format(&format))
{
return CODEC_ERROR;
}
} else if (memcmp(buf, "data", 4) == 0) {
format.numbytes = size;
/* advance to start of data */
ci->advance_buffer(8);
firstblockposn += 8;
break;
} else if (memcmp(buf, "fact", 4) == 0) {
/* dwSampleLength */
if (size >= 4)
format.totalsamples =
(buf[8]|(buf[9]<<8)|(buf[10]<<16)|(buf[11]<<24));
} else {
DEBUGF("unknown WAVE chunk: '%c%c%c%c', size=%lu\n",
buf[0], buf[1], buf[2], buf[3], (unsigned long)size);
}
/* go to next chunk (even chunk sizes must be padded) */
size += 8 + (size & 0x01);
ci->advance_buffer(size);
firstblockposn += size;
}
if (!codec)
{
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found\n");
return CODEC_ERROR;
}
/* common format check */
if (format.channels == 0) {
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-channels file\n");
return CODEC_ERROR;
}
if (format.samplesperblock == 0) {
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-wSamplesPerBlock file\n");
return CODEC_ERROR;
}
if (format.blockalign == 0)
{
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-blockalign file\n");
return CODEC_ERROR;
}
if (format.numbytes == 0) {
DEBUGF("CODEC_ERROR: 'data' chunk not found or has zero-length\n");
return CODEC_ERROR;
}
/* check chunksize */
if ((format.chunksize / format.blockalign) * format.samplesperblock * format.channels
> PCM_SAMPLE_SIZE)
format.chunksize = (PCM_SAMPLE_SIZE / format.blockalign) * format.blockalign;
if (format.chunksize == 0)
{
DEBUGF("CODEC_ERROR: chunksize is 0\n");
return CODEC_ERROR;
}
ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
if (format.channels == 2) {
ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
} else if (format.channels == 1) {
ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
} else {
DEBUGF("CODEC_ERROR: more than 2 channels\n");
return CODEC_ERROR;
}
/* make sure we're at the correct offset */
if (bytesdone > (uint32_t) firstblockposn) {
/* Round down to previous block */
struct pcm_pos *newpos = codec->get_seek_pos(bytesdone - firstblockposn,
PCM_SEEK_POS, &read_buffer);
if (newpos->pos > format.numbytes)
return CODEC_OK;
if (ci->seek_buffer(firstblockposn + newpos->pos))
{
bytesdone = newpos->pos;
decodedsamples = newpos->samples;
}
} else {
/* already where we need to be */
bytesdone = 0;
}
/* The main decoder loop */
endofstream = 0;
while (!endofstream) {
enum codec_command_action action = ci->get_command(¶m);
if (action == CODEC_ACTION_HALT)
break;
if (action == CODEC_ACTION_SEEK_TIME) {
struct pcm_pos *newpos = codec->get_seek_pos(param, PCM_SEEK_TIME,
&read_buffer);
if (newpos->pos > format.numbytes)
{
ci->set_elapsed(ci->id3->length);
ci->seek_complete();
break;
}
if (ci->seek_buffer(firstblockposn + newpos->pos))
{
bytesdone = newpos->pos;
decodedsamples = newpos->samples;
}
ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
ci->seek_complete();
}
wavbuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
if (n == 0)
break; /* End of stream */
if (bytesdone + n > format.numbytes) {
n = format.numbytes - bytesdone;
endofstream = 1;
}
if (codec->decode(wavbuf, n, samples, &bufcount) == CODEC_ERROR)
{
DEBUGF("codec error\n");
return CODEC_ERROR;
}
ci->pcmbuf_insert(samples, NULL, bufcount);
ci->advance_buffer(n);
bytesdone += n;
decodedsamples += bufcount;
if (bytesdone >= format.numbytes)
endofstream = 1;
ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
}
return CODEC_OK;
}
/* this is the codec entry point */
enum codec_status codec_main(void)
{
int status;
uint32_t decodedsamples;
size_t n;
int bufcount;
int endofstream;
unsigned char *buf;
uint8_t *wavbuf;
off_t firstblockposn; /* position of the first block in file */
const struct pcm_codec *codec;
uint64_t size;
/* Generic codec initialisation */
ci->configure(DSP_SET_SAMPLE_DEPTH, PCM_OUTPUT_DEPTH-1);
next_track:
status = CODEC_OK;
if (codec_init()) {
DEBUGF("codec_init() error\n");
status = CODEC_ERROR;
goto exit;
}
if (codec_wait_taginfo() != 0)
goto done;
codec_set_replaygain(ci->id3);
/* Need to save offset for later use (cleared indirectly by advance_buffer) */
bytesdone = ci->id3->offset;
/* get RIFF chunk header */
buf = ci->request_buffer(&n, 40);
if (n < 40) {
DEBUGF("request_buffer error\n");
status = CODEC_ERROR;
goto done;
}
if ((memcmp(buf , WAVE64_GUID_RIFF, 16) != 0) ||
(memcmp(buf+24, WAVE64_GUID_WAVE, 16) != 0))
{
status = CODEC_ERROR;
goto done;
}
/* advance to first WAVE chunk */
ci->advance_buffer(40);
firstblockposn = 40;
ci->memset(&format, 0, sizeof(struct pcm_format));
format.is_signed = true;
format.is_little_endian = true;
decodedsamples = 0;
codec = 0;
/* iterate over WAVE chunks until the 'data' chunk, which should be after the 'fmt ' chunk */
while (true) {
/* get WAVE chunk header */
buf = ci->request_buffer(&n, 1024);
if (n < 8) {
DEBUGF("data chunk request_buffer error\n");
/* no more chunks, 'data' chunk must not have been found */
status = CODEC_ERROR;
goto done;
}
/* chunkSize */
size = get_uint64_le(buf+16) - 24;
if (memcmp(buf, WAVE64_GUID_FMT, 16) == 0) {
if (size < 16) {
DEBUGF("CODEC_ERROR: 'fmt ' chunk size=%d < 16\n", (int)size);
status = CODEC_ERROR;
goto done;
}
/* wFormatTag */
format.formattag=buf[24]|(buf[25]<<8);
/* wChannels */
format.channels=buf[26]|(buf[27]<<8);
/* skipping dwSamplesPerSec */
/* skipping dwAvgBytesPerSec */
/* wBlockAlign */
format.blockalign=buf[36]|(buf[37]<<8);
/* wBitsPerSample */
format.bitspersample=buf[38]|(buf[39]<<8);
if (format.formattag != WAVE_FORMAT_PCM) {
if (size < 18) {
/* this is not a fatal error with some formats,
* we'll see later if we can't decode it */
DEBUGF("CODEC_WARNING: non-PCM WAVE (formattag=0x%x) "
"doesn't have ext. fmt descr (chunksize=%d<18).\n",
(unsigned int)format.formattag, (int)size);
}
else
{
if (format.formattag != WAVE_FORMAT_EXTENSIBLE)
format.samplesperblock = buf[42]|(buf[43]<<8);
else {
format.size = buf[40]|(buf[41]<<8);
if (format.size < 22) {
DEBUGF("CODEC_ERROR: WAVE_FORMAT_EXTENSIBLE is "
"missing extension\n");
status = CODEC_ERROR;
goto done;
}
/* wValidBitsPerSample */
format.bitspersample = buf[42]|(buf[43]<<8);
/* skipping dwChannelMask (4bytes) */
/* SubFormat (only get the first two bytes) */
format.formattag = buf[48]|(buf[49]<<8);
}
}
}
/* msadpcm specific */
if (format.formattag == WAVE_FORMAT_ADPCM)
{
if (!set_msadpcm_coeffs(buf))
{
status = CODEC_ERROR;
goto done;
}
}
/* get codec */
codec = get_wave_codec(format.formattag);
if (!codec)
{
DEBUGF("CODEC_ERROR: unsupported wave format 0x%x\n",
(unsigned int) format.formattag);
status = CODEC_ERROR;
goto done;
}
/* riff 8bit linear pcm is unsigned */
if (format.formattag == WAVE_FORMAT_PCM && format.bitspersample == 8)
format.is_signed = false;
/* check format, and calculate chunk size */
if (!codec->set_format(&format))
{
status = CODEC_ERROR;
goto done;
}
} else if (memcmp(buf, WAVE64_GUID_DATA, 16) == 0) {
format.numbytes = size;
/* advance to start of data */
ci->advance_buffer(24);
firstblockposn += 24;
break;
} else if (memcmp(buf, WAVE64_GUID_FACT, 16) == 0) {
/* skip 'fact' chunk */
} else {
DEBUGF("unknown Wave64 chunk: "
"'%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x'\n",
buf[0], buf[1], buf[ 2], buf[ 3], buf[ 4], buf[ 5], buf[ 6], buf[ 7],
buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
}
/* go to next chunk (8byte bound) */
size += 24 + ((1 + ~size) & 0x07);
ci->advance_buffer(size);
firstblockposn += size;
}
if (!codec)
{
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found\n");
status = CODEC_ERROR;
goto done;
}
/* common format check */
if (format.channels == 0) {
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-channels file\n");
status = CODEC_ERROR;
goto done;
}
if (format.samplesperblock == 0) {
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-wSamplesPerBlock file\n");
status = CODEC_ERROR;
goto done;
}
if (format.blockalign == 0)
{
DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-blockalign file\n");
status = CODEC_ERROR;
goto done;
}
if (format.numbytes == 0) {
DEBUGF("CODEC_ERROR: 'data' chunk not found or has zero-length\n");
status = CODEC_ERROR;
goto done;
}
/* check chunksize */
if ((format.chunksize / format.blockalign) * format.samplesperblock * format.channels
> PCM_SAMPLE_SIZE)
format.chunksize = (PCM_SAMPLE_SIZE / format.blockalign) * format.blockalign;
if (format.chunksize == 0)
{
DEBUGF("CODEC_ERROR: chunksize is 0\n");
status = CODEC_ERROR;
goto done;
}
ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
if (format.channels == 2) {
ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
} else if (format.channels == 1) {
ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
} else {
DEBUGF("CODEC_ERROR: more than 2 channels\n");
status = CODEC_ERROR;
goto done;
}
/* make sure we're at the correct offset */
if (bytesdone > (uint32_t) firstblockposn) {
/* Round down to previous block */
struct pcm_pos *newpos = codec->get_seek_pos(bytesdone - firstblockposn,
PCM_SEEK_POS, &read_buffer);
if (newpos->pos > format.numbytes)
goto done;
if (ci->seek_buffer(firstblockposn + newpos->pos))
{
bytesdone = newpos->pos;
decodedsamples = newpos->samples;
}
ci->seek_complete();
} else {
/* already where we need to be */
bytesdone = 0;
}
/* The main decoder loop */
endofstream = 0;
while (!endofstream) {
ci->yield();
if (ci->stop_codec || ci->new_track) {
break;
}
if (ci->seek_time) {
struct pcm_pos *newpos = codec->get_seek_pos(ci->seek_time, PCM_SEEK_TIME,
&read_buffer);
if (newpos->pos > format.numbytes)
break;
if (ci->seek_buffer(firstblockposn + newpos->pos))
{
bytesdone = newpos->pos;
decodedsamples = newpos->samples;
}
ci->seek_complete();
}
wavbuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
if (n == 0)
break; /* End of stream */
if (bytesdone + n > format.numbytes) {
n = format.numbytes - bytesdone;
endofstream = 1;
}
status = codec->decode(wavbuf, n, samples, &bufcount);
if (status == CODEC_ERROR)
{
DEBUGF("codec error\n");
goto done;
}
ci->pcmbuf_insert(samples, NULL, bufcount);
ci->advance_buffer(n);
bytesdone += n;
decodedsamples += bufcount;
if (bytesdone >= format.numbytes)
endofstream = 1;
ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
}
status = CODEC_OK;
done:
if (ci->request_next_track())
goto next_track;
exit:
return status;
}
