Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/apps/codecs/aiff.c
Andree Buschmann e75018ad66 Fix several 'variable set but not used' warnings reported from GCC 4.6.0. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29805 a1c6a512-1295-4272-9138-f99709370657
2011-05-01 11:42:41 +00:00

348 lines
11 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (c) 2005 Jvo Studer
* Copyright (c) 2009 Yoshihisa Uchida
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "codeclib.h"
#include "codecs/libpcm/support_formats.h"
CODEC_HEADER
#define FOURCC(c1, c2, c3, c4) \
((((uint32_t)c1)<<24)|(((uint32_t)c2)<<16)|(((uint32_t)c3)<<8)|((uint32_t)c4))
/* This codec supports the following AIFC compressionType formats */
enum {
AIFC_FORMAT_PCM = FOURCC('N', 'O', 'N', 'E'), /* AIFC PCM Format (big endian) */
AIFC_FORMAT_ALAW = FOURCC('a', 'l', 'a', 'w'), /* AIFC ALaw compressed */
AIFC_FORMAT_MULAW = FOURCC('u', 'l', 'a', 'w'), /* AIFC uLaw compressed */
AIFC_FORMAT_IEEE_FLOAT32 = FOURCC('f', 'l', '3', '2'), /* AIFC IEEE float 32 bit */
AIFC_FORMAT_IEEE_FLOAT64 = FOURCC('f', 'l', '6', '4'), /* AIFC IEEE float 64 bit */
AIFC_FORMAT_QT_IMA_ADPCM = FOURCC('i', 'm', 'a', '4'), /* AIFC QuickTime IMA ADPCM */
};
static const struct pcm_entry pcm_codecs[] = {
{ AIFC_FORMAT_PCM, get_linear_pcm_codec },
{ AIFC_FORMAT_ALAW, get_itut_g711_alaw_codec },
{ AIFC_FORMAT_MULAW, get_itut_g711_mulaw_codec },
{ AIFC_FORMAT_IEEE_FLOAT32, get_ieee_float_codec },
{ AIFC_FORMAT_IEEE_FLOAT64, get_ieee_float_codec },
{ AIFC_FORMAT_QT_IMA_ADPCM, get_qt_ima_adpcm_codec },
};
#define PCM_SAMPLE_SIZE (1024*2)
static int32_t samples[PCM_SAMPLE_SIZE] IBSS_ATTR;
static const struct pcm_codec *get_codec(uint32_t formattag)
{
unsigned i;
for (i = 0; i < sizeof(pcm_codecs)/sizeof(pcm_codecs[0]); i++)
if (pcm_codecs[i].format_tag == formattag)
return pcm_codecs[i].get_codec();
return NULL;
}
/* this is the codec entry point */
enum codec_status codec_main(enum codec_entry_call_reason reason)
{
if (reason == CODEC_LOAD) {
/* Generic codec initialisation */
ci->configure(DSP_SET_SAMPLE_DEPTH, PCM_OUTPUT_DEPTH-1);
}
return CODEC_OK;
}
/* this is called for each file to process */
enum codec_status codec_run(void)
{
struct pcm_format format;
uint32_t bytesdone, decodedsamples;
/* rockbox: comment 'set but unused' variables
uint32_t num_sample_frames = 0;
*/
size_t n;
int bufcount;
int endofstream;
unsigned char *buf;
uint8_t *aifbuf;
uint32_t offset2snd = 0;
off_t firstblockposn; /* position of the first block in file */
bool is_aifc = false;
const struct pcm_codec *codec;
uint32_t size;
intptr_t param;
if (codec_init()) {
return CODEC_ERROR;
}
codec_set_replaygain(ci->id3);
/* Need to save offset for later use (cleared indirectly by advance_buffer) */
bytesdone = ci->id3->offset;
/* assume the AIFF header is less than 1024 bytes */
ci->seek_buffer(0);
buf = ci->request_buffer(&n, 1024);
if (n < 54) {
return CODEC_ERROR;
}
if (memcmp(buf, "FORM", 4) != 0)
{
DEBUGF("CODEC_ERROR: does not aiff format %4.4s\n", (char*)&buf[0]);
return CODEC_ERROR;
}
if (memcmp(&buf[8], "AIFF", 4) == 0)
is_aifc = false;
else if (memcmp(&buf[8], "AIFC", 4) == 0)
is_aifc = true;
else
{
DEBUGF("CODEC_ERROR: does not aiff format %4.4s\n", (char*)&buf[8]);
return CODEC_ERROR;
}
buf += 12;
n -= 12;
ci->memset(&format, 0, sizeof(struct pcm_format));
format.is_signed = true;
format.is_little_endian = false;
decodedsamples = 0;
codec = 0;
/* read until 'SSND' chunk, which typically is last */
while (format.numbytes == 0 && n >= 8)
{
/* chunkSize */
size = ((buf[4]<<24)|(buf[5]<<16)|(buf[6]<<8)|buf[7]);
if (memcmp(buf, "COMM", 4) == 0) {
if ((!is_aifc && size < 18) || (is_aifc && size < 22))
{
DEBUGF("CODEC_ERROR: 'COMM' chunk size=%lu < %d\n",
(unsigned long)size, (is_aifc)?22:18);
return CODEC_ERROR;
}
/* num_channels */
format.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 */
format.bitspersample = ((buf[14]<<8)|buf[15]);
/* sample_rate (don't use last 4 bytes, only integer fs) */
if (buf[16] != 0x40) {
DEBUGF("CODEC_ERROR: weird sampling rate (no @)\n");
return CODEC_ERROR;
}
format.samplespersec = ((buf[18]<<24)|(buf[19]<<16)|(buf[20]<<8)|buf[21])+1;
format.samplespersec >>= (16 + 14 - buf[17]);
/* compressionType (AIFC only) */
if (is_aifc)
{
format.formattag = (buf[26]<<24)|(buf[27]<<16)|(buf[28]<<8)|buf[29];
/*
* aiff's sample_size is uncompressed sound data size.
* But format.bitspersample is compressed sound data size.
*/
if (format.formattag == AIFC_FORMAT_ALAW ||
format.formattag == AIFC_FORMAT_MULAW)
format.bitspersample = 8;
else if (format.formattag == AIFC_FORMAT_QT_IMA_ADPCM)
format.bitspersample = 4;
}
else
format.formattag = AIFC_FORMAT_PCM;
/* calc average bytes per second */
format.avgbytespersec = format.samplespersec*format.channels*format.bitspersample/8;
} else if (memcmp(buf, "SSND", 4)==0) {
if (format.bitspersample == 0) {
DEBUGF("CODEC_ERROR: unsupported chunk order\n");
return CODEC_ERROR;
}
/* offset2snd */
offset2snd = (buf[8]<<24)|(buf[9]<<16)|(buf[10]<<8)|buf[11];
/* block_size */
format.blockalign = ((buf[12]<<24)|(buf[13]<<16)|(buf[14]<<8)|buf[15]) >> 3;
if (format.blockalign == 0)
format.blockalign = format.channels * format.bitspersample >> 3;
format.numbytes = size - 8 - offset2snd;
size = 8 + offset2snd; /* advance to the beginning of data */
} else if (is_aifc && (memcmp(buf, "FVER", 4)==0)) {
/* Format Version Chunk (AIFC only chunk) */
/* skip this chunk */
} else {
DEBUGF("unsupported AIFF chunk: '%c%c%c%c', size=%lu\n",
buf[0], buf[1], buf[2], buf[3], (unsigned long)size);
}
size += 8 + (size & 0x01); /* odd chunk sizes must be padded */
buf += size;
if (n < size) {
DEBUGF("CODEC_ERROR: AIFF header size > 1024\n");
return CODEC_ERROR;
}
n -= size;
} /* while 'SSND' */
if (format.channels == 0) {
DEBUGF("CODEC_ERROR: 'COMM' chunk not found or 0-channels file\n");
return CODEC_ERROR;
}
if (format.numbytes == 0) {
DEBUGF("CODEC_ERROR: 'SSND' chunk not found or has zero length\n");
return CODEC_ERROR;
}
codec = get_codec(format.formattag);
if (codec == 0)
{
DEBUGF("CODEC_ERROR: AIFC does not support compressionType: 0x%x\n",
(unsigned int)format.formattag);
return CODEC_ERROR;
}
if (!codec->set_format(&format))
{
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 unsupported\n");
return CODEC_ERROR;
}
if (format.samplesperblock == 0)
{
DEBUGF("CODEC_ERROR: samplesperblock is 0\n");
return CODEC_ERROR;
}
if (format.blockalign == 0)
{
DEBUGF("CODEC_ERROR: blockalign is 0\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;
}
firstblockposn = 1024 - n;
ci->advance_buffer(firstblockposn);
/* 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, NULL);
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(&param);
if (action == CODEC_ACTION_HALT)
break;
if (action == CODEC_ACTION_SEEK_TIME) {
/* 3rd args(read_buffer) is unnecessary in the format which AIFF supports. */
struct pcm_pos *newpos = codec->get_seek_pos(param, PCM_SEEK_TIME, NULL);
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();
}
aifbuf = (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(aifbuf, 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;
}
Reference in a new issue View git blame Copy permalink