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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009 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 "librm/rm.h"
#include "libfaad/common.h"
#include "libfaad/structs.h"
#include "libfaad/decoder.h"
#include "libfaad/output.h"
CODEC_HEADER
/* Global buffers to be used in the mdct synthesis. This way the arrays can
* be moved to IRAM for some targets */
#define GB_BUF_SIZE 1024
static ALIGN real_t gb_time_buffer[2][GB_BUF_SIZE] IBSS_ATTR_FAAD_LARGE_IRAM;
static ALIGN real_t gb_fb_intermed[2][GB_BUF_SIZE] IBSS_ATTR_FAAD_LARGE_IRAM;
static void init_rm(RMContext *rmctx)
{
memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
}
static RMContext rmctx;
static RMPacket pkt;
/* this is the codec entry point */
enum codec_status codec_main(void)
{
static NeAACDecFrameInfo frame_info;
NeAACDecHandle decoder;
size_t n;
void *ret;
int needed_bufsize;
unsigned int i;
unsigned char* buffer;
int err, consumed, pkt_offset, skipped = 0;
uint32_t s = 0; /* sample rate */
unsigned char c = 0; /* channels */
int playback_on = -1;
size_t resume_offset = ci->id3->offset;
/* Generic codec initialisation */
ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
next_track:
err = CODEC_OK;
if (codec_init()) {
DEBUGF("FAAD: Codec init error\n");
return CODEC_ERROR;
}
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
ci->memset(&rmctx,0,sizeof(RMContext));
ci->memset(&pkt,0,sizeof(RMPacket));
init_rm(&rmctx);
ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
codec_set_replaygain(ci->id3);
/* initialise the sound converter */
decoder = NeAACDecOpen();
if (!decoder) {
DEBUGF("FAAD: Decode open error\n");
err = CODEC_ERROR;
goto done;
}
NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(decoder);
conf->outputFormat = FAAD_FMT_16BIT; /* irrelevant, we don't convert */
NeAACDecSetConfiguration(decoder, conf);
decoder->config.defObjectType = rmctx.codec_extradata[0];
decoder->config.defSampleRate = rmctx.sample_rate;
err = NeAACDecInit(decoder, NULL, 0, &s, &c);
if (err) {
DEBUGF("FAAD: DecInit: %d, %d\n", err, decoder->object_type);
err = CODEC_ERROR;
goto done;
}
/* Set pointer to be able to use IRAM an to avoid alloc in decoder. Must
* be called after NeAACDecOpen(). */
/* A buffer of framelength or 2*frameLenght size must be allocated for
* time_out. If frameLength is too big or SBR/forceUpSampling is active,
* we do not use the IRAM buffer and keep faad's internal allocation (see
* specrec.c). */
needed_bufsize = decoder->frameLength;
#ifdef SBR_DEC
if ((decoder->sbr_present_flag == 1) || (decoder->forceUpSampling == 1))
{
needed_bufsize *= 2;
}
#endif
if (needed_bufsize <= GB_BUF_SIZE)
{
decoder->time_out[0] = &gb_time_buffer[0][0];
decoder->time_out[1] = &gb_time_buffer[1][0];
}
/* A buffer of with frameLength elements must be allocated for fb_intermed.
* If frameLength is too big, we do not use the IRAM buffer and keep faad's
* internal allocation (see specrec.c). */
needed_bufsize = decoder->frameLength;
if (needed_bufsize <= GB_BUF_SIZE)
{
decoder->fb_intermed[0] = &gb_fb_intermed[0][0];
decoder->fb_intermed[1] = &gb_fb_intermed[1][0];
}
/* check for a mid-track resume and force a seek time accordingly */
if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
/* put number of subpackets to skip in resume_offset */
resume_offset /= (rmctx.block_align + PACKET_HEADER_SIZE);
ci->seek_time = (int)resume_offset * ((rmctx.block_align * 8 * 1000)/rmctx.bit_rate);
}
ci->id3->frequency = s;
ci->set_elapsed(0);
ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
/* The main decoding loop */
seek_start:
while (1) {
ci->yield();
if (ci->stop_codec || ci->new_track) {
break;
}
if (ci->seek_time) {
/* Do not allow seeking beyond the file's length */
if ((unsigned) ci->seek_time > ci->id3->length) {
ci->seek_complete();
goto done;
}
ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
/* Seek to the start of the track */
if (ci->seek_time == 1) {
ci->set_elapsed(0);
ci->seek_complete();
goto seek_start;
}
skipped = 0;
while(1) {
buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
pkt_offset = skipped - pkt.length;
consumed = rm_get_packet(&buffer, &rmctx, &pkt);
if(consumed < 0 && playback_on != 0) {
if(playback_on == -1) {
/* Error only if packet-parsing failed and playback hadn't started */
DEBUGF("rm_get_packet failed\n");
return CODEC_ERROR;
}
else
goto done;
}
skipped += pkt.length;
if(pkt.timestamp > (unsigned)ci->seek_time) break;
ci->advance_buffer(pkt.length);
}
ci->seek_buffer(pkt_offset + rmctx.data_offset + DATA_HEADER_SIZE);
buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
ci->seek_complete();
}
/* Request the required number of bytes from the input buffer */
buffer=ci->request_buffer(&n,rmctx.audio_framesize + 1000);
consumed = rm_get_packet(&buffer, &rmctx, &pkt);
if(consumed < 0 && playback_on != 0) {
if(playback_on == -1) {
/* Error only if packet-parsing failed and playback hadn't started */
DEBUGF("rm_get_packet failed\n");
return CODEC_ERROR;
}
else
goto done;
}
playback_on = 1;
if (pkt.timestamp >= ci->id3->length)
goto done;
/* Decode one block - returned samples will be host-endian */
for(i = 0; i < rmctx.sub_packet_cnt; i++) {
ret = NeAACDecDecode(decoder, &frame_info, buffer, rmctx.sub_packet_lengths[i]);
buffer += rmctx.sub_packet_lengths[i];
if (frame_info.error > 0) {
DEBUGF("FAAD: decode error '%s'\n", NeAACDecGetErrorMessage(frame_info.error));
err = CODEC_ERROR;
goto exit;
}
ci->pcmbuf_insert(decoder->time_out[0],
decoder->time_out[1],
decoder->frameLength);
ci->set_elapsed(pkt.timestamp);
}
ci->advance_buffer(pkt.length);
}
err = CODEC_OK;
done:
if (ci->request_next_track())
goto next_track;
exit:
return err;
}
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