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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 "plugin.h"
#include "playback.h"
#include "lib/codeclib.h"
#define BYTESWAP(x) (((x>>8) & 0xff) | ((x<<8) & 0xff00))
/* Number of bytes to process in one iteration */
#define WAV_CHUNK_SIZE (1024*4)
#ifndef SIMULATOR
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
/* this is the plugin entry point */
enum plugin_status plugin_start(struct plugin_api* api, void* parm)
{
struct plugin_api* rb = (struct plugin_api*)api;
struct codec_api* ci = (struct codec_api*)parm;
unsigned long samplerate,numbytes,totalsamples,samplesdone,nsamples;
int channels,bytespersample,bitspersample;
unsigned int i;
size_t n;
int endofstream;
unsigned char* header;
unsigned short* wavbuf;
/* Generic plugin initialisation */
TEST_PLUGIN_API(api);
/* if you are using a global api pointer, don't forget to copy it!
otherwise you will get lovely "I04: IllInstr" errors... :-) */
rb = 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*256));
next_track:
if (codec_init(api, ci)) {
return PLUGIN_ERROR;
}
/* FIX: Correctly parse WAV header - we assume canonical 44-byte header */
header=ci->request_buffer(&n,44);
if (n!=44) {
return PLUGIN_ERROR;
}
if ((memcmp(header,"RIFF",4)!=0) || (memcmp(&header[8],"WAVEfmt",7)!=0)) {
return PLUGIN_ERROR;
}
samplerate=header[24]|(header[25]<<8)|(header[26]<<16)|(header[27]<<24);
bitspersample=header[34];
channels=header[22];
bytespersample=((bitspersample/8)*channels);
numbytes=(header[40]|(header[41]<<8)|(header[42]<<16)|(header[43]<<24));
totalsamples=numbytes/bytespersample;
if ((bitspersample!=16) || (channels != 2)) {
return PLUGIN_ERROR;
}
ci->advance_buffer(44);
/* The main decoder loop */
samplesdone=0;
ci->set_elapsed(0);
endofstream=0;
while (!endofstream) {
if (ci->stop_codec || ci->reload_codec) {
break;
}
wavbuf=ci->request_buffer(&n,WAV_CHUNK_SIZE);
if (n==0) break; /* End of stream */
nsamples=(n/bytespersample);
/* WAV files can contain extra data at the end - so we can't just
process until the end of the file */
if (samplesdone+nsamples > totalsamples) {
nsamples=(totalsamples-samplesdone);
n=nsamples*bytespersample;
endofstream=1;
}
/* Byte-swap data */
for (i=0;i<n/2;i++) {
wavbuf[i]=BYTESWAP(wavbuf[i]);
}
samplesdone+=nsamples;
ci->set_elapsed(samplesdone/(ci->id3->frequency/1000));
rb->yield();
while (!ci->audiobuffer_insert((unsigned char*)wavbuf, n))
rb->yield();
ci->advance_buffer(n);
}
if (ci->request_next_track())
goto next_track;
return PLUGIN_OK;
}
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