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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 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"
#define ROCKBOX
#include <codecs/demac/libdemac/demac.h>
CODEC_HEADER
#define BLOCKS_PER_LOOP 4608
#define MAX_CHANNELS 2
#define MAX_BYTESPERSAMPLE 3
#define INPUT_CHUNKSIZE (32*1024)
/* 4608*4 = 18432 bytes per channel */
static int32_t decoded0[BLOCKS_PER_LOOP] IBSS_ATTR;
static int32_t decoded1[BLOCKS_PER_LOOP] IBSS_ATTR;
#define MAX_SUPPORTED_SEEKTABLE_SIZE 5000
/* this is the codec entry point */
enum codec_status codec_main(void)
{
struct ape_ctx_t ape_ctx;
uint32_t samplesdone;
uint32_t elapsedtime;
size_t bytesleft;
int retval;
uint32_t currentframe;
int nblocks;
int bytesconsumed;
unsigned char* inbuffer;
int blockstodecode;
int res;
int firstbyte;
/* Generic codec initialisation */
ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512);
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, 1024*128);
ci->configure(DSP_SET_SAMPLE_DEPTH, APE_OUTPUT_DEPTH-1);
next_track:
if (codec_init()) {
LOGF("APE: Error initialising codec\n");
retval = CODEC_ERROR;
goto exit;
}
inbuffer = ci->request_buffer(&bytesleft, INPUT_CHUNKSIZE);
/* Read the file headers to populate the ape_ctx struct */
if (ape_parseheaderbuf(inbuffer,&ape_ctx) < 0) {
LOGF("APE: Error reading header\n");
retval = CODEC_ERROR;
goto exit;
}
ci->advance_buffer(ape_ctx.firstframe);
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
ci->configure(DSP_SWITCH_FREQUENCY, ape_ctx.samplerate);
ci->configure(DSP_SET_STEREO_MODE, ape_ctx.channels == 1 ?
STEREO_MONO : STEREO_NONINTERLEAVED);
codec_set_replaygain(ci->id3);
/* The main decoding loop */
currentframe = 0;
samplesdone = 0;
/* Initialise the buffer */
inbuffer = ci->request_buffer(&bytesleft, INPUT_CHUNKSIZE);
firstbyte = 3; /* Take account of the little-endian 32-bit byte ordering */
/* The main decoding loop - we decode the frames a small chunk at a time */
while (currentframe < ape_ctx.totalframes)
{
/* Calculate how many blocks there are in this frame */
if (currentframe == (ape_ctx.totalframes - 1))
nblocks = ape_ctx.finalframeblocks;
else
nblocks = ape_ctx.blocksperframe;
ape_ctx.currentframeblocks = nblocks;
/* Initialise the frame decoder */
init_frame_decoder(&ape_ctx, inbuffer, &firstbyte, &bytesconsumed);
ci->advance_buffer(bytesconsumed);
inbuffer = ci->request_buffer(&bytesleft, INPUT_CHUNKSIZE);
/* Decode the frame a chunk at a time */
while (nblocks > 0)
{
ci->yield();
if (ci->stop_codec || ci->new_track) {
break;
}
blockstodecode = MIN(BLOCKS_PER_LOOP, nblocks);
if ((res = decode_chunk(&ape_ctx, inbuffer, &firstbyte,
&bytesconsumed,
decoded0, decoded1,
blockstodecode)) < 0)
{
/* Frame decoding error, abort */
LOGF("APE: Frame %d, error %d\n",currentframe,res);
retval = CODEC_ERROR;
goto done;
}
ci->yield();
ci->pcmbuf_insert(decoded0, decoded1, blockstodecode);
/* Update the elapsed-time indicator */
samplesdone += blockstodecode;
elapsedtime = (samplesdone*10)/(ape_ctx.samplerate/100);
ci->set_elapsed(elapsedtime);
ci->advance_buffer(bytesconsumed);
inbuffer = ci->request_buffer(&bytesleft, INPUT_CHUNKSIZE);
/* Decrement the block count */
nblocks -= blockstodecode;
}
currentframe++;
}
retval = CODEC_OK;
done:
LOGF("APE: Decoded %ld samples\n",samplesdone);
if (ci->request_next_track())
goto next_track;
exit:
return retval;
}
|
