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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(enum codec_entry_call_reason reason)
{
if (reason == CODEC_LOAD) {
/* Generic codec initialisation */
ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
}
return CODEC_OK;
}
/* this is called for each file to process */
enum codec_status codec_run(void)
{
uint32_t elapsedtime;
asf_waveformatex_t wfx;
size_t resume_offset;
int i;
int wmares = 0;
int res = 0;
uint8_t* audiobuf;
int audiobufsize;
int packetlength = 0;
int errcount = 0;
intptr_t param;
/* Remember the resume position - when the codec is opened, the
playback engine will reset it. */
resume_offset = ci->id3->offset;
restart_track:
/* Proper reset of the decoder context. */
memset(&wmadec, 0, sizeof(wmadec));
if (codec_init()) {
LOGF("WMA: Error initialising codec\n");
return CODEC_ERROR;
}
/* 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));
ci->seek_buffer(ci->id3->first_frame_offset);
if (wma_decode_init(&wmadec,&wfx) < 0) {
LOGF("WMA: Unsupported or corrupt file\n");
return CODEC_ERROR;
}
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);
}
else
{
/* Now advance the file position to the first frame */
ci->seek_buffer(ci->id3->first_frame_offset);
elapsedtime = 0;
}
ci->set_elapsed(elapsedtime);
resume_offset = 0;
ci->configure(DSP_SET_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 */
while (res >= 0)
{
enum codec_command_action action = ci->get_command(¶m);
if (action != CODEC_ACTION_NULL) {
/*flush the wma decoder state*/
wmadec.last_superframe_len = 0;
wmadec.last_bitoffset = 0;
/*zero the frame out buffer so we don't overlap with a
stale samples*/
memset((*(wmadec.frame_out)), 0,
sizeof(fixed32) * MAX_CHANNELS * BLOCK_MAX_SIZE * 2);
if (action == CODEC_ACTION_HALT)
break;
/* Deal with any pending seek requests */
if (action == CODEC_ACTION_SEEK_TIME) {
if (param == 0) {
ci->set_elapsed(0);
ci->seek_complete();
goto restart_track; /* Pretend you never saw this... */
}
elapsedtime = asf_seek(param, &wfx);
if (elapsedtime < 1){
ci->set_elapsed(0);
ci->seek_complete();
break;
}
/*DEBUGF("Seek returned %d\n", (int)elapsedtime);*/
ci->set_elapsed(elapsedtime);
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.
*/
if (res == ASF_ERROR_EOF) {
/* File ended - not an error */
break;
}
errcount++;
DEBUGF("read_packet error %d, errcount %d\n",wmares, errcount);
if (errcount > 5) {
return CODEC_ERROR;
} 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) {
return CODEC_ERROR;
} 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->advance_buffer(packetlength);
}
/*LOGF("WMA: Decoded %ld samples\n",elapsedtime*wfx.rate/1000);*/
return CODEC_OK;
}
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