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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 Mohamed Tarek
*
* 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 "libwmapro/wmaprodec.h"
CODEC_HEADER
#define MAXSAMPLES (1L << 12) /* Max number of samples in a wma pro subframe */
#define MAXCHANNELS 8
#define BUFSIZE MAXCHANNELS * MAXSAMPLES
int32_t decoded[BUFSIZE];
AVCodecContext avctx;
AVPacket avpkt;
/* This function initialises AVCodecContext with the data needed for the wmapro
* decoder to work. The required data is taken from asf_waveformatex_t because that's
* what the rockbox asf metadata parser fill/work with. In the future, when the
* codec is being optimised for on-target playback this function should not be needed,
* as we will be working directly with WMAProDecodeCtx (declared in wmaprodec.c) */
static void init_codec_ctx(AVCodecContext *avctx, asf_waveformatex_t *wfx)
{
/* Copy the extra-data */
avctx->extradata_size = wfx->datalen;
avctx->extradata = (uint8_t *)malloc(wfx->datalen*sizeof(uint8_t));
memcpy(avctx->extradata, wfx->data, wfx->datalen*sizeof(uint8_t));
avctx->block_align = wfx->blockalign;
avctx->sample_rate = wfx->rate;
avctx->channels = wfx->channels;
}
/* this is the codec entry point */
enum codec_status codec_main(void)
{
uint32_t elapsedtime;
int retval;
asf_waveformatex_t wfx; /* Holds the stream properties */
size_t resume_offset;
int res; /* Return values from asf_read_packet() and decode_packet() */
uint8_t* audiobuf; /* Pointer to the payload of one wma pro packet */
int audiobufsize; /* Payload size */
int packetlength = 0; /* Logical packet size (minus the header size) */
int outlen = 0; /* Number of bytes written to the output buffer */
int pktcnt = 0; /* Count of the packets played */
/* Generic codec initialisation */
ci->configure(DSP_SET_SAMPLE_DEPTH, 17);
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 */
resume_offset = ci->id3->offset;
restart_track:
if (codec_init()) {
LOGF("(WMA PRO) Error: Error initialising codec\n");
retval = CODEC_ERROR;
goto done;
}
/* 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->configure(DSP_SWITCH_FREQUENCY, wfx.rate);
ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
STEREO_MONO : STEREO_INTERLEAVED);
codec_set_replaygain(ci->id3);
/* Initialise the AVCodecContext */
init_codec_ctx(&avctx, &wfx);
if (decode_init(&avctx) < 0) {
LOGF("(WMA PRO) Error: Unsupported or corrupt file\n");
retval = CODEC_ERROR;
goto done;
}
/* Now advance the file position to the first frame */
ci->seek_buffer(ci->id3->first_frame_offset);
elapsedtime = 0;
resume_offset = 0;
/* The main decoding loop */
while (pktcnt < wfx.numpackets)
{
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;
}
ci->set_elapsed(elapsedtime);
ci->seek_complete();
}
res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
if (res < 0) {
LOGF("(WMA PRO) Warning: asf_read_packet returned %d", res);
goto done;
} else {
avpkt.data = audiobuf;
avpkt.size = audiobufsize;
pktcnt++;
/* We now loop on the packet, decoding and outputting the subframes
* one-by-one. For more information about how wma pro structures its
* audio frames, see libwmapro/wmaprodec.c */
while(avpkt.size > 0)
{
outlen = BUFSIZE; /* decode_packet needs to know the size of the output buffer */
res = decode_packet(&avctx, decoded, &outlen, &avpkt);
avpkt.data += res;
avpkt.size -= res;
avctx.frame_number++;
if(outlen) {
ci->yield ();
/* outlen now holds the size of the data in bytes - we want the
* number of samples. */
outlen /= (sizeof(int32_t) * wfx.channels);
ci->pcmbuf_insert(decoded, NULL, outlen);
elapsedtime += outlen*10/(wfx.rate/100);
ci->set_elapsed(elapsedtime);
ci->yield ();
}
}
}
/* Advance to the next logical packet */
ci->advance_buffer(packetlength);
}
retval = CODEC_OK;
done:
if (ci->request_next_track())
goto next_track;
return retval;
}
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