rockbox - My Rockbox tree

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author	Jonathan Gordon <rockbox@jdgordon.info>	2009-09-06 16:54:43 +0000
committer	Jonathan Gordon <rockbox@jdgordon.info>	2009-09-06 16:54:43 +0000
commit	ef7018a7ffda346fa4c3ef46566509376d492b61 (patch)
tree	08367cf04ea2b31e4541ecda66fdfecde891f8d8 /apps/plugins/lib
parent	9f4f5dbc2683a17159aac153aaccce023fc5dab3 (diff)
download	rockbox-ef7018a7ffda346fa4c3ef46566509376d492b61.zip rockbox-ef7018a7ffda346fa4c3ef46566509376d492b61.tar.gz rockbox-ef7018a7ffda346fa4c3ef46566509376d492b61.tar.bz2 rockbox-ef7018a7ffda346fa4c3ef46566509376d492b61.tar.xz

fix red :)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22643 a1c6a512-1295-4272-9138-f99709370657

Diffstat (limited to 'apps/plugins/lib')

0 files changed, 0 insertions, 0 deletions

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/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 Dave Chapman
 *
 * 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 <codecs/libmad/mad.h>
#include <inttypes.h>

CODEC_HEADER

#if NUM_CORES > 1 && !defined(MPEGPLAYER)
#define MPA_SYNTH_ON_COP
#endif

static struct mad_stream stream IBSS_ATTR;
static struct mad_frame frame IBSS_ATTR;
static struct mad_synth synth IBSS_ATTR;

#ifdef MPA_SYNTH_ON_COP
static volatile short die IBSS_ATTR = 0;          /*thread should die*/

#if (CONFIG_CPU == PP5024) || (CONFIG_CPU == PP5022)
static mad_fixed_t sbsample_prev[2][36][32] IBSS_ATTR;
#else
static mad_fixed_t sbsample_prev[2][36][32] SHAREDBSS_ATTR; 
#endif

static struct semaphore synth_done_sem IBSS_ATTR;
static struct semaphore synth_pending_sem IBSS_ATTR;
#endif

#define INPUT_CHUNK_SIZE   8192

static mad_fixed_t mad_frame_overlap[2][32][18] IBSS_ATTR;
static mad_fixed_t sbsample[2][36][32] IBSS_ATTR;

static unsigned char mad_main_data[MAD_BUFFER_MDLEN] IBSS_ATTR;
/* TODO: what latency does layer 1 have? */
static int mpeg_latency[3] = { 0, 481, 529 };
static int mpeg_framesize[3] = {384, 1152, 1152};

static void init_mad(void)
{
    ci->memset(&stream, 0, sizeof(struct mad_stream));
    ci->memset(&frame , 0, sizeof(struct mad_frame));
    ci->memset(&synth , 0, sizeof(struct mad_synth));

#ifdef MPA_SYNTH_ON_COP
    frame.sbsample_prev = &sbsample_prev;
    frame.sbsample      = &sbsample;
#else
    frame.sbsample_prev = &sbsample;
    frame.sbsample      = &sbsample;
#endif

    /* We do this so libmad doesn't try to call codec_calloc(). This needs to
     * be called before mad_stream_init(), mad_frame_inti() and 
     * mad_synth_init(). */
    frame.overlap    = &mad_frame_overlap;
    stream.main_data = &mad_main_data;
    
    /* Call mad initialization. Those will zero the arrays frame.overlap,
     * frame.sbsample and frame.sbsample_prev. Therefore there is no need to 
     * zero them here. */
    mad_stream_init(&stream);
    mad_frame_init(&frame);
    mad_synth_init(&synth);
}

static int get_file_pos(int newtime)
{
    int pos = -1;
    struct mp3entry *id3 = ci->id3;

    if (id3->vbr) {
        /* Convert newtime and id3->length to seconds to
         * avoid overflow */
        unsigned int newtime_s = newtime/1000;
        unsigned int length_s  = id3->length/1000;
        
        if (id3->has_toc) {
            /* Use the TOC to find the new position */
            unsigned int percent, remainder;
            int curtoc, nexttoc, plen;

            percent = (newtime_s*100) / length_s;
            if (percent > 99)
                percent = 99;

            curtoc = id3->toc[percent];

            if (percent < 99) {
                nexttoc = id3->toc[percent+1];
            } else {
                nexttoc = 256;
            }

            pos = (id3->filesize/256)*curtoc;

            /* Use the remainder to get a more accurate position */
            remainder   = (newtime_s*100) % length_s;
            remainder   = (remainder*100) / length_s;
            plen        = (nexttoc - curtoc)*(id3->filesize/256);
            pos        += (plen/100)*remainder;
        } else {
            /* No TOC exists, estimate the new position */
            pos = (id3->filesize / length_s) * newtime_s;
        }
    } else if (id3->bitrate) {
        pos = newtime * (id3->bitrate / 8);
    } else {
        return -1;
    }

    /* Don't seek right to the end of the file so that we can
       transition properly to the next song */
    if (pos >= (int)(id3->filesize - id3->id3v1len))
        pos = id3->filesize - id3->id3v1len - 1;

    /* id3->filesize excludes id3->first_frame_offset, so add it now */
    pos += id3->first_frame_offset;

    return pos;
}

static void set_elapsed(struct mp3entry* id3)
{
    unsigned long offset = id3->offset > id3->first_frame_offset ?
        id3->offset - id3->first_frame_offset : 0;
    unsigned long elapsed = id3->elapsed;

    if ( id3->vbr ) {
        if ( id3->has_toc ) {
            /* calculate elapsed time using TOC */
            int i;
            unsigned int remainder, plen, relpos, nextpos;

            /* find wich percent we're at */
            for (i=0; i<100; i++ )
                if ( offset < id3->toc[i] * (id3->filesize / 256) )
                    break;

            i--;
            if (i < 0)
                i = 0;

            relpos = id3->toc[i];

            if (i < 99)
                nextpos = id3->toc[i+1];
            else
                nextpos = 256;

            remainder = offset - (relpos * (id3->filesize / 256));

            /* set time for this percent (divide before multiply to prevent
               overflow on long files. loss of precision is negligible on
               short files) */
            elapsed = i * (id3->length / 100);

            /* calculate remainder time */
            plen = (nextpos - relpos) * (id3->filesize / 256);
            elapsed += (((remainder * 100) / plen) * (id3->length / 10000));
        }
        else {
            /* no TOC exists. set a rough estimate using average bitrate */
            int tpk = id3->length /
                ((id3->filesize - id3->first_frame_offset - id3->id3v1len) /
                1024);
            elapsed = offset / 1024 * tpk;
        }
    }
    else
    {
        /* constant bitrate, use exact calculation */
        if (id3->bitrate != 0)
            elapsed = offset / (id3->bitrate / 8);
    }

    ci->set_elapsed(elapsed);
}

#ifdef MPA_SYNTH_ON_COP

/*
 * Run the synthesis filter on the COProcessor 
 */

static int mad_synth_thread_stack[DEFAULT_STACK_SIZE/sizeof(int)] IBSS_ATTR;

static const unsigned char * const mad_synth_thread_name = "mp3dec";
static unsigned int mad_synth_thread_id = 0;


static void mad_synth_thread(void)
{
    while(1) {
        ci->semaphore_release(&synth_done_sem);
        ci->semaphore_wait(&synth_pending_sem, TIMEOUT_BLOCK);
        
        if(die)
            break;

        mad_synth_frame(&synth, &frame);
    }    
}

/* wait for the synth thread to go idle which indicates a PCM frame has been
 * synthesized */
static inline void mad_synth_thread_wait_pcm(void)
{
    ci->semaphore_wait(&synth_done_sem, TIMEOUT_BLOCK);
}

/* increment the done semaphore - used after a wait for idle to preserve the
 * semaphore count */
static inline void mad_synth_thread_unwait_pcm(void)
{
    ci->semaphore_release(&synth_done_sem);
}

/* after synth thread has gone idle - switch decoded frames and commence
 * synthesis on it */
static void mad_synth_thread_ready(void)
{
    mad_fixed_t (*temp)[2][36][32];

    /*circular buffer that holds 2 frames' samples*/
    temp=frame.sbsample;
    frame.sbsample = frame.sbsample_prev;
    frame.sbsample_prev=temp;

    ci->semaphore_release(&synth_pending_sem);
}

static bool mad_synth_thread_create(void)
{
    ci->semaphore_init(&synth_done_sem, 1, 0);
    ci->semaphore_init(&synth_pending_sem, 1, 0);
       
    mad_synth_thread_id = ci->create_thread(mad_synth_thread, 
                            mad_synth_thread_stack,
                            sizeof(mad_synth_thread_stack), 0,
                            mad_synth_thread_name 
                            IF_PRIO(, PRIORITY_PLAYBACK)
                            IF_COP(, COP));
    
    if (mad_synth_thread_id == 0)
        return false;

    return true;
}

static void mad_synth_thread_quit(void)
{
    /* mop up COP thread */
    die = 1;
    ci->semaphore_release(&synth_pending_sem);
    ci->thread_wait(mad_synth_thread_id);
    ci->commit_discard_dcache();
}
#else
static inline void mad_synth_thread_ready(void)
{
     mad_synth_frame(&synth, &frame);
}

static inline bool mad_synth_thread_create(void)
{
    return true;
}

static inline void mad_synth_thread_quit(void)
{
}

static inline void mad_synth_thread_wait_pcm(void)
{
}

static inline void mad_synth_thread_unwait_pcm(void)
{
}
#endif /* MPA_SYNTH_ON_COP */

/* this is the codec entry point */


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