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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Dave Chapman
*
* 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 "libm4a/m4a.h"
#include "libalac/decomp.h"
#ifndef SIMULATOR
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
#define destBufferSize (1024*16)
char inputBuffer[1024*32]; /* Input buffer */
int32_t outputbuffer[ALAC_MAX_CHANNELS][ALAC_BLOCKSIZE] IBSS_ATTR;
struct codec_api* rb;
struct codec_api* ci;
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api* api)
{
size_t n;
demux_res_t demux_res;
stream_t input_stream;
uint32_t samplesdone;
uint32_t elapsedtime;
uint32_t sample_duration;
uint32_t sample_byte_size;
int samplesdecoded;
unsigned int i;
unsigned char* buffer;
alac_file alac;
/* Generic codec initialisation */
TEST_CODEC_API(api);
rb = api;
ci = (struct codec_api*)api;
#ifndef SIMULATOR
rb->memcpy(iramstart, iramcopy, iramend-iramstart);
#endif
ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*10));
ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(1024*512));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*128));
ci->configure(CODEC_DSP_ENABLE, (bool *)true);
ci->configure(DSP_DITHER, (bool *)false);
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_NONINTERLEAVED);
ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(28));
next_track:
if (codec_init(api)) {
LOGF("ALAC: Error initialising codec\n");
return CODEC_ERROR;
}
while (!rb->taginfo_ready)
rb->yield();
ci->configure(DSP_SET_FREQUENCY, (long *)(rb->id3->frequency));
stream_create(&input_stream,ci);
/* if qtmovie_read returns successfully, the stream is up to
* the movie data, which can be used directly by the decoder */
if (!qtmovie_read(&input_stream, &demux_res)) {
LOGF("ALAC: Error initialising file\n");
return CODEC_ERROR;
}
/* initialise the sound converter */
create_alac(demux_res.sample_size, demux_res.num_channels,&alac);
alac_set_info(&alac, demux_res.codecdata);
i=0;
samplesdone=0;
/* The main decoding loop */
while (i < demux_res.num_sample_byte_sizes) {
rb->yield();
if (ci->stop_codec || ci->reload_codec) {
break;
}
/* Deal with any pending seek requests */
if (ci->seek_time) {
if (alac_seek(&demux_res,&input_stream,
(ci->seek_time/10) * (ci->id3->frequency/100),
&samplesdone, &i)) {
elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
ci->set_elapsed(elapsedtime);
}
ci->seek_time = 0;
}
/* Lookup the length (in samples and bytes) of block i */
if (!get_sample_info(&demux_res, i, &sample_duration,
&sample_byte_size)) {
LOGF("ALAC: Error in get_sample_info\n");
return CODEC_ERROR;
}
/* Request the required number of bytes from the input buffer */
buffer=ci->request_buffer((long*)&n,sample_byte_size);
if (n!=sample_byte_size) {
/* The decode_frame function requires the whole frame, so if we
can't get it contiguously from the buffer, then we need to
copy it via a read - i.e. we are at the buffer wraparound
point */
/* Check we estimated the maximum buffer size correctly */
if (sample_byte_size > sizeof(inputBuffer)) {
LOGF("ALAC: Input buffer < %d bytes\n",sample_byte_size);
return CODEC_ERROR;
}
n=ci->read_filebuf(inputBuffer,sample_byte_size);
if (n!=sample_byte_size) {
LOGF("ALAC: Error reading data\n");
return CODEC_ERROR;
}
buffer=inputBuffer;
}
/* Decode one block - returned samples will be host-endian */
rb->yield();
samplesdecoded=alac_decode_frame(&alac, buffer, outputbuffer, rb->yield);
/* Advance codec buffer - unless we did a read */
if ((char*)buffer!=(char*)inputBuffer) {
ci->advance_buffer(n);
}
/* Output the audio */
rb->yield();
while(!ci->pcmbuf_insert_split(outputbuffer[0],
outputbuffer[1],
samplesdecoded*sizeof(int32_t)))
rb->yield();
/* Update the elapsed-time indicator */
samplesdone+=sample_duration;
elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
ci->set_elapsed(elapsedtime);
/* Keep track of current position - for resuming */
ci->set_offset(elapsedtime);
i++;
}
LOGF("ALAC: Decoded %d samples\n",samplesdone);
if (ci->request_next_track())
goto next_track;
return CODEC_OK;
}
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