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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 <string.h>
#include "codeclib.h"
#include "inttypes.h"
#include "libcook/cook.h"
CODEC_HEADER
static RMContext rmctx IBSS_ATTR_COOK_LARGE_IRAM;
static RMPacket pkt IBSS_ATTR_COOK_LARGE_IRAM;
static COOKContext q IBSS_ATTR;
static int32_t rm_outbuf[2048] IBSS_ATTR_COOK_LARGE_IRAM MEM_ALIGN_ATTR;
static void init_rm(RMContext *rmctx)
{
memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
}
static int request_packet(int size)
{
int consumed = 0;
while (1)
{
uint8_t *buffer = ci->request_buffer((size_t *)(&consumed), size);
if (!consumed)
break;
consumed = rm_get_packet(&buffer, &rmctx, &pkt);
if (consumed < 0 || consumed == size)
break;
ci->advance_buffer(size);
}
return consumed;
}
/* this is the codec entry point */
enum codec_status codec_main(enum codec_entry_call_reason reason)
{
/* Nothing to do */
return CODEC_OK;
(void)reason;
}
/* this is called for each file to process */
enum codec_status codec_run(void)
{
int datasize, res, consumed, i, time_offset;
uint16_t fs,sps,h;
uint32_t packet_count;
int spn, packet_header_size, scrambling_unit_size, num_units;
size_t resume_offset;
intptr_t param;
long action;
if (codec_init()) {
DEBUGF("codec init failed\n");
return CODEC_ERROR;
}
action = CODEC_ACTION_NULL;
param = ci->id3->elapsed;
resume_offset = ci->id3->offset;
codec_set_replaygain(ci->id3);
ci->memset(&rmctx,0,sizeof(RMContext));
ci->memset(&pkt,0,sizeof(RMPacket));
ci->memset(&q,0,sizeof(COOKContext));
ci->seek_buffer(0);
init_rm(&rmctx);
ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
/* cook's sample representation is 21.11
* DSP_SET_SAMPLE_DEPTH = 11 (FRACT) + 16 (NATIVE) - 1 (SIGN) = 26 */
ci->configure(DSP_SET_SAMPLE_DEPTH, 26);
ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
STEREO_MONO : STEREO_NONINTERLEAVED);
packet_header_size = PACKET_HEADER_SIZE +
((rmctx.flags & RM_PKT_V1) ? 1 : 0);
packet_count = rmctx.nb_packets;
rmctx.audio_framesize = rmctx.block_align;
rmctx.block_align = rmctx.sub_packet_size;
fs = rmctx.audio_framesize;
sps= rmctx.block_align;
h = rmctx.sub_packet_h;
scrambling_unit_size = h * (fs + packet_header_size);
spn = h * fs / sps;
res =cook_decode_init(&rmctx, &q);
if(res < 0) {
DEBUGF("failed to initialize cook decoder\n");
return CODEC_ERROR;
}
/* check for a mid-track resume and force a seek time accordingly */
if(resume_offset) {
resume_offset -= MIN(resume_offset, rmctx.data_offset + DATA_HEADER_SIZE);
num_units = (int)resume_offset / scrambling_unit_size;
/* put number of packets to skip in resume_offset */
resume_offset = num_units * h;
param = (int)resume_offset * ((8000LL * fs)/rmctx.bit_rate);
}
if (param) {
action = CODEC_ACTION_SEEK_TIME;
}
else {
ci->set_elapsed(0);
}
ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
/* The main decoder loop */
seek_start :
while(packet_count)
{
consumed = request_packet(scrambling_unit_size);
if (!consumed)
break;
if(consumed < 0) {
DEBUGF("rm_get_packet failed\n");
return CODEC_ERROR;
}
for (i = 0; i < spn; i++)
{
if (action == CODEC_ACTION_NULL)
action = ci->get_command(¶m);
if (action == CODEC_ACTION_HALT)
return CODEC_OK;
if (action == CODEC_ACTION_SEEK_TIME) {
/* Do not allow seeking beyond the file's length */
if ((unsigned) param > ci->id3->length) {
ci->set_elapsed(ci->id3->length);
ci->seek_complete();
return CODEC_OK;
}
ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
packet_count = rmctx.nb_packets;
rmctx.audio_pkt_cnt = 0;
rmctx.frame_number = 0;
/* Seek to the start of the track */
if (param == 0) {
ci->set_elapsed(0);
ci->seek_complete();
action = CODEC_ACTION_NULL;
goto seek_start;
}
num_units = (param/(sps*1000*8/rmctx.bit_rate))/spn;
ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + scrambling_unit_size * num_units);
consumed = request_packet(scrambling_unit_size);
if (!consumed) {
ci->seek_complete();
return CODEC_OK;
}
if(consumed < 0) {
DEBUGF("rm_get_packet failed\n");
ci->seek_complete();
return CODEC_ERROR;
}
packet_count = rmctx.nb_packets - h * num_units;
rmctx.frame_number = (param/(sps*1000*8/rmctx.bit_rate));
while(rmctx.audiotimestamp > (unsigned)param && num_units-- > 0) {
rmctx.audio_pkt_cnt = 0;
ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + scrambling_unit_size * num_units);
consumed = request_packet(scrambling_unit_size);
if (!consumed) {
ci->seek_complete();
return CODEC_OK;
}
if(consumed < 0) {
ci->seek_complete();
DEBUGF("rm_get_packet failed\n");
return CODEC_ERROR;
}
packet_count += h;
}
if (num_units < 0)
rmctx.audiotimestamp = 0;
time_offset = param - rmctx.audiotimestamp;
i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
ci->set_elapsed(param);
ci->seek_complete();
}
action = CODEC_ACTION_NULL;
res = cook_decode_frame(&rmctx,&q, rm_outbuf, &datasize, pkt.frames[i], sps);
if (res != sps) {
DEBUGF("codec error\n");
return CODEC_ERROR;
}
if(datasize)
ci->pcmbuf_insert(rm_outbuf,
rm_outbuf+q.samples_per_channel,
q.samples_per_channel);
ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
rmctx.frame_number++;
}
packet_count -= h;
rmctx.audio_pkt_cnt = 0;
ci->advance_buffer(scrambling_unit_size);
}
return CODEC_OK;
}
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