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rockbox/apps/codecs/aiff.c
Linus Nielsen Feltzing f5f000fe03 Minor code policing 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8525 a1c6a512-1295-4272-9138-f99709370657
2006-02-01 17:58:10 +00:00

313 lines
9.1 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (c) 2005 Jvo Studer
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "codeclib.h"
#include "inttypes.h"
CODEC_HEADER
struct codec_api* rb;
/* This codec supports AIFF files with the following formats:
* - PCM, 8 and 16 bits, mono or stereo
*/
enum
{
AIFF_FORMAT_PCM = 0x0001, /* AIFF PCM Format (big endian) */
IEEE_FORMAT_FLOAT = 0x0003, /* IEEE Float */
AIFF_FORMAT_ALAW = 0x0004, /* AIFC ALaw compressed */
AIFF_FORMAT_ULAW = 0x0005 /* AIFC uLaw compressed */
};
/* Maximum number of bytes to process in one iteration */
/* for 44.1kHz stereo 16bits, this represents 0.023s ~= 1/50s */
#define AIF_CHUNK_SIZE (1024*2)
#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
extern char iedata[];
extern char iend[];
#endif
static int16_t int16_samples[AIF_CHUNK_SIZE] IBSS_ATTR;
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api* api)
{
struct codec_api* ci;
uint32_t numbytes, bytesdone;
uint16_t num_channels = 0;
uint32_t num_sample_frames = 0;
uint16_t sample_size = 0;
uint32_t sample_rate = 0;
uint32_t i;
size_t n, aifbufsize;
int endofstream;
unsigned char* buf;
uint16_t* aifbuf;
long chunksize;
uint32_t offset2snd = 0;
uint16_t block_size = 0;
uint32_t avgbytespersec = 0;
off_t firstblockposn; /* position of the first block in file */
int shortorlong = 1; /* do we output shorts (1) or longs (2)? */
int32_t * const int32_samples = (int32_t*)int16_samples;
/* Generic codec initialisation */
rb = api;
ci = api;
#ifdef USE_IRAM
ci->memcpy(iramstart, iramcopy, iramend-iramstart);
ci->memset(iedata, 0, iend - iedata);
#endif
ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(1024*512));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*256));
ci->configure(DSP_DITHER, (bool *)false);
next_track:
if (codec_init(api)) {
i = CODEC_ERROR;
goto exit;
}
while (!*ci->taginfo_ready)
ci->yield();
/* assume the AIFF header is less than 1024 bytes */
buf=ci->request_buffer((long *)&n,1024);
if (n<44) {
i = CODEC_ERROR;
goto exit;
}
if ((memcmp(buf,"FORM",4)!=0) || (memcmp(&buf[8],"AIFF",4)!=0)) {
i = CODEC_ERROR;
goto exit;
}
buf += 12;
n -= 12;
numbytes = 0;
/* read until 'SSND' chunk, which typically is last */
while(numbytes == 0 && n >= 8) {
/* chunkSize */
i = ((buf[4]<<24)|(buf[5]<<16)|(buf[6]<<8)|buf[7]);
if (memcmp(buf,"COMM",4)==0) {
if (i != 18) {
DEBUGF("CODEC_ERROR: 'COMM' chunk size=%lu != 18\n",i);
i = CODEC_ERROR;
goto exit;
}
/* num_channels */
num_channels = ((buf[8]<<8)|buf[9]);
/* num_sample_frames */
num_sample_frames = ((buf[10]<<24)|(buf[11]<<16)|(buf[12]<<8)|buf[13]);
/* sample_size */
sample_size = ((buf[14]<<8)|buf[15]);
/* sample_rate (don't use last 4 bytes, only integer fs) */
if (buf[16] != 0x40) {
DEBUGF("CODEC_ERROR: wierd sampling rate (no @)\n",i);
i = CODEC_ERROR;
goto exit;
}
sample_rate = ((buf[18]<<24)|(buf[19]<<16)|(buf[20]<<8)|buf[21])+1;
sample_rate = sample_rate >> (16+14-buf[17]);
/* calc average bytes per second */
avgbytespersec = sample_rate*num_channels*sample_size/8;
}
else if (memcmp(buf,"SSND",4)==0) {
if (sample_size == 0) {
DEBUGF("CODEC_ERROR: unsupported chunk order\n");
i = CODEC_ERROR;
goto exit;
}
/* offset2snd */
offset2snd = ((buf[8]<<8)|buf[9]);
/* block_size */
block_size = ((buf[10]<<8)|buf[11]);
if (block_size == 0)
block_size = num_channels*sample_size;
numbytes = i-8-offset2snd;
i = 8+offset2snd; /* advance to the beginning of data */
}
else {
DEBUGF("unsupported AIFF chunk: '%c%c%c%c', size=%lu\n",
buf[0], buf[1], buf[2], buf[3], i);
}
if (i & 0x01) /* odd chunk sizes must be padded */
i++;
buf += i+8;
if (n < (i+8)) {
DEBUGF("CODEC_ERROR: AIFF header size > 1024\n");
i = CODEC_ERROR;
goto exit;
}
n -= i+8;
} /* while 'SSND' */
if (num_channels == 0) {
DEBUGF("CODEC_ERROR: 'COMM' chunk not found or 0-channels file\n");
i = CODEC_ERROR;
goto exit;
}
if (numbytes == 0) {
DEBUGF("CODEC_ERROR: 'SSND' chunk not found or has zero length\n");
i = CODEC_ERROR;
goto exit;
}
if (sample_size > 24) {
DEBUGF("CODEC_ERROR: PCM with more than 24 bits per sample "
"is unsupported\n");
i = CODEC_ERROR;
goto exit;
}
ci->configure(CODEC_DSP_ENABLE, (bool *)true);
ci->configure(DSP_SET_FREQUENCY, (long *)(ci->id3->frequency));
if (sample_size <= 16) {
ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(16));
} else {
shortorlong = 2;
ci->configure(DSP_DITHER, (bool *)false);
ci->configure(DSP_SET_SAMPLE_DEPTH, (long *) (32));
ci->configure(DSP_SET_CLIP_MAX, (long *) (2147483647));
ci->configure(DSP_SET_CLIP_MIN, (long *) (-2147483647-1));
}
if (num_channels == 2) {
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_INTERLEAVED);
} else if (num_channels == 1) {
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_MONO);
} else {
DEBUGF("CODEC_ERROR: more than 2 channels unsupported\n");
i = CODEC_ERROR;
goto exit;
}
firstblockposn = (1024-n);
ci->advance_buffer(firstblockposn);
/* The main decoder loop */
bytesdone=0;
ci->set_elapsed(0);
endofstream=0;
/* chunksize is computed so that one chunk is about 1/50s.
* this make 4096 for 44.1kHz 16bits stereo.
* It also has to be a multiple of blockalign */
chunksize = (1 + avgbytespersec / (50*block_size)) * block_size;
/* check that the output buffer is big enough (convert to samplespersec,
then round to the block_size multiple below) */
if (((uint64_t)chunksize*ci->id3->frequency*num_channels*shortorlong)
/ (uint64_t)avgbytespersec >= AIF_CHUNK_SIZE) {
chunksize = ((uint64_t)AIF_CHUNK_SIZE * avgbytespersec
/ ((uint64_t)ci->id3->frequency * num_channels * shortorlong
* block_size)) * block_size;
}
while (!endofstream) {
uint8_t *aifbuf8;
ci->yield();
if (ci->stop_codec || ci->reload_codec) {
break;
}
if (ci->seek_time) {
uint32_t newpos;
/* use avgbytespersec to round to the closest blockalign multiple,
add firstblockposn. 64-bit casts to avoid overflows. */
newpos = (((uint64_t)avgbytespersec * (ci->seek_time - 1))
/ (1000LL*block_size)) * block_size;
if (newpos > numbytes)
break;
if (ci->seek_buffer(firstblockposn + newpos)) {
bytesdone = newpos;
}
ci->seek_complete();
}
aifbuf=ci->request_buffer((long *)&n,chunksize);
aifbuf8 = (uint8_t*)aifbuf;
if (n==0)
break; /* End of stream */
if (bytesdone + n > numbytes) {
n = numbytes - bytesdone;
endofstream = 1;
}
aifbufsize = sizeof(int16_samples);
if (sample_size > 24) {
for (i=0;i<n;i+=4) {
int32_samples[i/4]=(int32_t)((aifbuf8[i]<<24)|
(aifbuf8[i+1]<<16)|(aifbuf8[i+2]<<8)|aifbuf8[i+3]);
}
aifbufsize = n;
} else if (sample_size > 16) {
for (i=0;i<n;i+=3) {
int32_samples[i/3]=(int32_t)((aifbuf8[i]<<24)|
(aifbuf8[i+1]<<16)|(aifbuf8[i+2]<<8));
}
aifbufsize = n*4/3;
} else if (sample_size > 8) {
/* copy data. */
for (i=0;i<n;i+=2) {
int16_samples[i/2]=(int16_t)((aifbuf8[i]<<8)|aifbuf8[i+1]);
}
aifbufsize = n;
} else {
for (i=0;i<n;i++) {
int16_samples[i] = (aifbuf8[i]<<8) - 0x8000;
}
aifbufsize = n*2;
}
while (!ci->pcmbuf_insert((char*)int16_samples, aifbufsize)) {
ci->yield();
}
ci->advance_buffer(n);
bytesdone += n;
if (bytesdone >= numbytes) {
endofstream=1;
}
ci->set_elapsed(bytesdone*1000LL/avgbytespersec);
}
if (ci->request_next_track())
goto next_track;
i = CODEC_OK;
exit:
return i;
}
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