161 lines
5.3 KiB
C
161 lines
5.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2010 Mohamed Tarek
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "codeclib.h"
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#include "libasf/asf.h"
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#include "libwmapro/wmaprodec.h"
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CODEC_HEADER
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static int32_t *dec[2]; /* pointers to the output buffers in WMAProDecodeCtx in
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wmaprodec.c */
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/* this is the codec entry point */
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enum codec_status codec_main(enum codec_entry_call_reason reason)
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{
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if (reason == CODEC_LOAD) {
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/* Generic codec initialisation */
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ci->configure(DSP_SET_SAMPLE_DEPTH, WMAPRO_DSP_SAMPLE_DEPTH);
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}
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return CODEC_OK;
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}
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/* this is called for each file to process */
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enum codec_status codec_run(void)
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{
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uint32_t elapsedtime;
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asf_waveformatex_t wfx; /* Holds the stream properties */
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int res; /* Return values from asf_read_packet() and decode_packet() */
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uint8_t* audiobuf; /* Pointer to the payload of one wma pro packet */
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int audiobufsize; /* Payload size */
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int packetlength = 0; /* Logical packet size (minus the header size) */
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int outlen = 0; /* Number of bytes written to the output buffer */
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unsigned int pktcnt = 0; /* Count of the packets played */
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uint8_t *data; /* Pointer to decoder input buffer */
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int size; /* Size of the input frame to the decoder */
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intptr_t param;
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elapsedtime = ci->id3->elapsed;
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restart_track:
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if (codec_init()) {
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LOGF("(WMA PRO) Error: Error initialising codec\n");
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return CODEC_ERROR;
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}
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/* Copy the format metadata we've stored in the id3 TOC field. This
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saves us from parsing it again here. */
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memcpy(&wfx, ci->id3->toc, sizeof(wfx));
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ci->configure(DSP_SET_FREQUENCY, wfx.rate);
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ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
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STEREO_MONO : STEREO_NONINTERLEAVED);
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codec_set_replaygain(ci->id3);
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if (decode_init(&wfx) < 0) {
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LOGF("(WMA PRO) Error: Unsupported or corrupt file\n");
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return CODEC_ERROR;
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}
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if (elapsedtime) {
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elapsedtime = asf_seek(elapsedtime, &wfx);
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if (elapsedtime < 1)
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return CODEC_OK;
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}
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else {
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/* Now advance the file position to the first frame */
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ci->seek_buffer(ci->id3->first_frame_offset);
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}
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ci->set_elapsed(elapsedtime);
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/* The main decoding loop */
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while (pktcnt < wfx.numpackets)
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{
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enum codec_command_action action = ci->get_command(¶m);
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if (action == CODEC_ACTION_HALT)
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break;
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/* Deal with any pending seek requests */
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if (action == CODEC_ACTION_SEEK_TIME) {
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if (param == 0) {
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ci->set_elapsed(0);
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ci->seek_complete();
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elapsedtime = 0;
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goto restart_track; /* Pretend you never saw this... */
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}
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elapsedtime = asf_seek(param, &wfx);
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if (elapsedtime < 1){
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ci->set_elapsed(0);
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ci->seek_complete();
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break;
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}
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ci->set_elapsed(elapsedtime);
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ci->seek_complete();
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}
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res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
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if (res < 0) {
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LOGF("(WMA PRO) Warning: asf_read_packet returned %d", res);
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return CODEC_ERROR;
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} else {
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data = audiobuf;
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size = audiobufsize;
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pktcnt++;
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/* We now loop on the packet, decoding and outputting the subframes
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* one-by-one. For more information about how wma pro structures its
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* audio frames, see libwmapro/wmaprodec.c */
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while(size > 0)
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{
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res = decode_packet(&wfx, dec, &outlen, data, size);
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if(res < 0) {
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LOGF("(WMA PRO) Error: decode_packet returned %d", res);
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return CODEC_ERROR;
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}
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data += res;
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size -= res;
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if(outlen) {
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ci->yield ();
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outlen /= (wfx.channels);
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ci->pcmbuf_insert(dec[0], dec[1], outlen );
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elapsedtime += outlen*10/(wfx.rate/100);
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ci->set_elapsed(elapsedtime);
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ci->yield ();
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}
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}
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}
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/* Advance to the next logical packet */
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ci->advance_buffer(packetlength);
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}
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return CODEC_OK;
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}
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