rockbox/apps/codecs/cook.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * 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 "logf.h"
#include "codeclib.h"
#include "inttypes.h"
#include "libcook/cook.h"

#define DATA_HEADER_SIZE 18 /* size of DATA chunk header in a rm file */

CODEC_HEADER

RMContext rmctx;
RMPacket pkt;
COOKContext q;

static void init_rm(RMContext *rmctx)
{
    memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
}

/* this is the codec entry point */
enum codec_status codec_main(void)
{ 
    static size_t buff_size;
    int datasize, res, consumed,i;
    uint8_t *bit_buffer;
    int16_t outbuf[2048] __attribute__((aligned(32)));
    uint16_t fs,sps,h;
    uint32_t packet_count;
    int scrambling_unit_size;

next_track:
    if (codec_init()) {
        DEBUGF("codec init failed\n");
        return CODEC_ERROR;
    }
    while (!*ci->taginfo_ready && !ci->stop_codec)
        ci->sleep(1);

    codec_set_replaygain(ci->id3);
    ci->memset(&rmctx,0,sizeof(RMContext));
    ci->memset(&pkt,0,sizeof(RMPacket));
    ci->memset(&q,0,sizeof(COOKContext));

    init_rm(&rmctx);
 
    ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
    ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
    ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
                  STEREO_MONO : STEREO_INTERLEAVED);

    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;
    
    res =cook_decode_init(&rmctx, &q);
    if(res < 0) {
        DEBUGF("failed to initialize cook decoder\n");
        return CODEC_ERROR;
    }

    ci->set_elapsed(0);
    ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);

    /* The main decoder loop */  
seek_start :         
    while(packet_count)
    {  
        bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
        consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
        if(consumed < 0) {
            DEBUGF("rm_get_packet failed\n");
            return CODEC_ERROR;
        }
        /*DEBUGF("    version = %d\n"
                 "    length  = %d\n"
                 "    stream  = %d\n"
                 "    timestamp= %d\n",pkt.version,pkt.length,pkt.stream_number,pkt.timestamp);*/

        for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
        { 
            ci->yield();
            if (ci->stop_codec || ci->new_track)
                goto done;
             if (ci->seek_time == 1) {
                ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
                ci->set_elapsed(0);
                packet_count = rmctx.nb_packets;
                rmctx.audio_pkt_cnt = 0;
                rmctx.frame_number = 0;
                ci->seek_complete();
                goto seek_start;           
             }

            res = cook_decode_frame(&rmctx,&q, outbuf, &datasize, pkt.frames[i], rmctx.block_align);
            rmctx.frame_number++;

            /* skip the first two frames; no valid audio */
            if(rmctx.frame_number < 3) continue;

            if(res != rmctx.block_align) {
                DEBUGF("codec error\n");
                return CODEC_ERROR;
            }

            ci->pcmbuf_insert(outbuf, NULL, rmctx.samples_pf_pc / rmctx.nb_channels);
            ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);       
        }
        packet_count -= rmctx.audio_pkt_cnt;
        rmctx.audio_pkt_cnt = 0;
        ci->advance_buffer(consumed);
    }

    done :
    if (ci->request_next_track())
        goto next_track;

    return CODEC_OK;    
}