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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 David Bryant
*
* 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 "libwavpack/wavpack.h"
CODEC_HEADER
static struct codec_api *ci;
#define BUFFER_SIZE 4096
static int32_t temp_buffer [BUFFER_SIZE] IBSS_ATTR;
static int32_t read_callback (void *buffer, int32_t bytes)
{
int32_t retval = ci->read_filebuf (buffer, bytes);
ci->id3->offset = ci->curpos;
return retval;
}
#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
extern char iedata[];
extern char iend[];
#endif
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api* api)
{
WavpackContext *wpc;
char error [80];
int bps, nchans, sr_100;
int retval;
/* Generic codec initialisation */
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*128));
ci->configure(DSP_DITHER, (bool *)false);
ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(28));
next_track:
if (codec_init(api)) {
retval = CODEC_ERROR;
goto exit;
}
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
ci->configure(DSP_SET_FREQUENCY, (long *)(ci->id3->frequency));
codec_set_replaygain(ci->id3);
/* Create a decoder instance */
wpc = WavpackOpenFileInput (read_callback, error);
if (!wpc) {
retval = CODEC_ERROR;
goto done;
}
bps = WavpackGetBytesPerSample (wpc);
nchans = WavpackGetReducedChannels (wpc);
ci->configure(DSP_SET_STEREO_MODE, nchans == 2 ? (int *)STEREO_INTERLEAVED : (int *)STEREO_MONO);
sr_100 = ci->id3->frequency / 100;
ci->set_elapsed (0);
/* The main decoder loop */
while (1) {
int32_t nsamples;
if (ci->seek_time && ci->taginfo_ready && ci->id3->length) {
ci->seek_time--;
int curpos_ms = WavpackGetSampleIndex (wpc) / sr_100 * 10;
int n, d, skip;
if (ci->seek_time > curpos_ms) {
n = ci->seek_time - curpos_ms;
d = ci->id3->length - curpos_ms;
skip = (int)((int64_t)(ci->filesize - ci->curpos) * n / d);
ci->seek_buffer (ci->curpos + skip);
}
else {
n = curpos_ms - ci->seek_time;
d = curpos_ms;
skip = (int)((int64_t) ci->curpos * n / d);
ci->seek_buffer (ci->curpos - skip);
}
wpc = WavpackOpenFileInput (read_callback, error);
ci->seek_complete();
if (!wpc)
break;
ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
ci->yield ();
}
nsamples = WavpackUnpackSamples (wpc, temp_buffer, BUFFER_SIZE / nchans);
if (!nsamples || ci->stop_codec || ci->new_track)
break;
ci->yield ();
if (ci->stop_codec || ci->new_track)
break;
while (!ci->pcmbuf_insert ((char *) temp_buffer, nsamples * nchans * 4))
ci->sleep (1);
ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
ci->yield ();
}
retval = CODEC_OK;
done:
if (ci->request_next_track())
goto next_track;
exit:
return retval;
}
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