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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 Dave Chapman
*
* 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 "libasf/asf.h"
#include "libwma/wmadec.h"
CODEC_HEADER
/* NOTE: WMADecodeContext is 120152 bytes (on x86) */
static WMADecodeContext wmadec;
/* this is the codec entry point */
enum codec_status codec_main(void)
{
uint32_t elapsedtime;
int retval;
asf_waveformatex_t wfx;
size_t resume_offset;
int i;
int wmares, res;
uint8_t* audiobuf;
int audiobufsize;
int packetlength = 0;
int errcount = 0;
/* Generic codec initialisation */
ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
next_track:
/* Wait for the metadata to be read */
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
retval = CODEC_OK;
/* Remember the resume position - when the codec is opened, the
playback engine will reset it. */
resume_offset = ci->id3->offset;
restart_track:
if (codec_init()) {
LOGF("WMA: Error initialising codec\n");
retval = CODEC_ERROR;
goto exit;
}
/* Copy the format metadata we've stored in the id3 TOC field. This
saves us from parsing it again here. */
memcpy(&wfx, ci->id3->toc, sizeof(wfx));
if (wma_decode_init(&wmadec,&wfx) < 0) {
LOGF("WMA: Unsupported or corrupt file\n");
retval = CODEC_ERROR;
goto exit;
}
if (resume_offset > ci->id3->first_frame_offset)
{
/* Get start of current packet */
int packet_offset = (resume_offset - ci->id3->first_frame_offset)
% wfx.packet_size;
ci->seek_buffer(resume_offset - packet_offset);
elapsedtime = asf_get_timestamp(&i);
ci->set_elapsed(elapsedtime);
}
else
{
/* Now advance the file position to the first frame */
ci->seek_buffer(ci->id3->first_frame_offset);
elapsedtime = 0;
}
resume_offset = 0;
ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate);
ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
STEREO_MONO : STEREO_NONINTERLEAVED);
codec_set_replaygain(ci->id3);
/* The main decoding loop */
res = 1;
while (res >= 0)
{
ci->yield();
if (ci->stop_codec || ci->new_track) {
goto done;
}
/* Deal with any pending seek requests */
if (ci->seek_time){
if (ci->seek_time == 1) {
ci->seek_complete();
goto restart_track; /* Pretend you never saw this... */
}
elapsedtime = asf_seek(ci->seek_time, &wfx);
if (elapsedtime < 1){
ci->seek_complete();
goto next_track;
}
/*DEBUGF("Seek returned %d\n", (int)elapsedtime);*/
ci->set_elapsed(elapsedtime);
/*flush the wma decoder state*/
wmadec.last_superframe_len = 0;
wmadec.last_bitoffset = 0;
ci->seek_complete();
}
errcount = 0;
new_packet:
res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
if (res < 0) {
/* We'll try to recover from a parse error a certain number of
* times. If we succeed, the error counter will be reset.
*/
errcount++;
DEBUGF("read_packet error %d, errcount %d\n",wmares, errcount);
if (errcount > 5) {
goto done;
} else {
ci->advance_buffer(packetlength);
goto new_packet;
}
} else if (res > 0) {
wma_decode_superframe_init(&wmadec, audiobuf, audiobufsize);
for (i=0; i < wmadec.nb_frames; i++)
{
wmares = wma_decode_superframe_frame(&wmadec,
audiobuf, audiobufsize);
ci->yield ();
if (wmares < 0) {
/* Do the above, but for errors in decode. */
errcount++;
DEBUGF("WMA decode error %d, errcount %d\n",wmares, errcount);
if (errcount > 5) {
goto done;
} else {
ci->advance_buffer(packetlength);
goto new_packet;
}
} else if (wmares > 0) {
ci->pcmbuf_insert((*wmadec.frame_out)[0], (*wmadec.frame_out)[1], wmares);
elapsedtime += (wmares*10)/(wfx.rate/100);
ci->set_elapsed(elapsedtime);
}
ci->yield();
}
}
ci->advance_buffer(packetlength);
}
retval = CODEC_OK;
done:
/*LOGF("WMA: Decoded %ld samples\n",elapsedtime*wfx.rate/1000);*/
if (ci->request_next_track())
goto next_track;
exit:
return retval;
}
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