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author	Karl Kurbjun <kkurbjun@gmail.com>	2009-08-31 13:23:12 +0000
committer	Karl Kurbjun <kkurbjun@gmail.com>	2009-08-31 13:23:12 +0000
commit	b01bae51a4162b5c3526e981c04718a8d98b7353 (patch)
tree	f245ff769feb6e6818fde87c49a87fee669a9c65 /apps/plugins/lua/rockmalloc.c
parent	5fc5b5093a9f916150a50e7c28dfc7298108a115 (diff)
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Jewels: Add support for vertical stride.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22571 a1c6a512-1295-4272-9138-f99709370657

Diffstat (limited to 'apps/plugins/lua/rockmalloc.c')

0 files changed, 0 insertions, 0 deletions

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/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2006 Adam Gashlin (hcs)
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include "codeclib.h"
#include "inttypes.h"

CODEC_HEADER

struct codec_api *rb;

/* Maximum number of bytes to process in one iteration */
#define WAV_CHUNK_SIZE (1024*2)

/* Volume for ADX decoder */
#define BASE_VOL 0x2000

/* Number of times to loop looped tracks when repeat is disabled */
#define LOOP_TIMES 2

/* Length of fade-out for looped tracks (milliseconds) */
#define FADE_LENGTH 10000L

static int16_t samples[WAV_CHUNK_SIZE] IBSS_ATTR;

/* this is the codec entry point */
enum codec_status codec_start(struct codec_api *api)
{
    struct codec_api *ci;
    int channels;
    int sampleswritten, i;
    uint8_t *buf;
    int32_t ch1_1, ch1_2, ch2_1, ch2_2; /* ADPCM history */
    size_t n, bufsize;
    int endofstream; /* end of stream flag */
    uint32_t avgbytespersec;
    int looping; /* looping flag */
    int loop_count; /* number of loops done so far */
    int fade_count; /*  countdown for fadeout */
    int fade_frames; /* length of fade in frames */
    off_t start_adr, end_adr; /* loop points */
    off_t chanstart, bufoff;

    /* Generic codec initialisation */
    rb = api;
    ci = api;
    
    /* we only render 16 bits */
    ci->configure(DSP_SET_SAMPLE_DEPTH, (long *)16);
    /*ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*256));*/
  
next_track:
    DEBUGF("ADX: next_track\n");
    if (codec_init(api)) {
        return CODEC_ERROR;
    }
    DEBUGF("ADX: after init\n");
    
    /* init history */
    ch1_1=ch1_2=ch2_1=ch2_2=0;

    /* wait for track info to load */
    while (!*ci->taginfo_ready && !ci->stop_codec)
        ci->sleep(1);
        
    /* Read the entire file (or as much as possible) */
    DEBUGF("ADX: request initial buffer\n");
    ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(ci->filesize));
    ci->seek_buffer(0);
    buf = ci->request_buffer(&n, ci->filesize);
    if (!buf || n < 0x38) {
        return CODEC_ERROR;
    }
    bufsize = n;
    bufoff = 0;
    DEBUGF("ADX: read size = %x\n",bufsize);

    /* Get file header for starting offset, channel count */
    
    chanstart = ((buf[2] << 8) | buf[3]) + 4;
    channels = buf[7];
    
    /* useful for seeking and reporting current playback position */
    avgbytespersec = ci->id3->frequency * 18 * channels / 32;
    DEBUGF("avgbytespersec=%d\n",avgbytespersec);
    
    /* Get loop data */
    
    looping = 0; start_adr = 0; end_adr = 0;
    if (!memcmp(buf+0x10,"\x01\xF4\x03\x00",4)) {
        /* Soul Calibur 2 style (type 03) */
        DEBUGF("ADX: type 03 found\n");
        /* check if header is too small for loop data */
		if (chanstart-6 < 0x2c) looping=0;
	    else {
		    looping = (buf[0x18]) ||
		              (buf[0x19]) ||
		              (buf[0x1a]) ||
		              (buf[0x1b]);
		    end_adr = (buf[0x28]<<24) |
		              (buf[0x29]<<16) |
		              (buf[0x2a]<<8) |
		              (buf[0x2b]);

		    start_adr = (
		      (buf[0x1c]<<24) |
		      (buf[0x1d]<<16) |
		      (buf[0x1e]<<8) |
		      (buf[0x1f])
		      )/32*channels*18+chanstart;
		}
    } else if (!memcmp(buf+0x10,"\x01\xF4\x04\x00",4)) {
        /* Standard (type 04) */
        DEBUGF("ADX: type 04 found\n");
        /* check if header is too small for loop data */
        if (chanstart-6 < 0x38) looping=0;
		else {
			looping = (buf[0x24]) ||
			          (buf[0x25]) ||
			          (buf[0x26]) ||
			          (buf[0x27]);
		    end_adr = (buf[0x34]<<24) |
		              (buf[0x35]<<16) |
		              (buf[0x36]<<8) |
		              buf[0x37];
			start_adr = (
			  (buf[0x28]<<24) |
			  (buf[0x29]<<16) |
			  (buf[0x2a]<<8) |
			  (buf[0x2b])
			  )/32*channels*18+chanstart;
		}
    } else {
        DEBUGF("ADX: error, couldn't determine ADX type\n");
        return CODEC_ERROR;
    }

    if (looping) {
        DEBUGF("ADX: looped, start: %x end: %x\n",start_adr,end_adr);
    } else {
        DEBUGF("ADX: not looped\n");
    }
    
    /* advance to first frame */
    /*ci->seek_buffer(chanstart);*/
    DEBUGF("ADX: first frame at %x\n",chanstart);
    bufoff = chanstart;

    /* setup pcm buffer format */
    ci->configure(DSP_SET_FREQUENCY, (long *)(ci->id3->frequency));
    if (channels == 2) {
        ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_INTERLEAVED);
    } else if (channels == 1) {
        ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_MONO);
    } else {
        DEBUGF("ADX CODEC_ERROR: more than 2 channels\n");
        return CODEC_ERROR;
    }    

    endofstream = 0;
    loop_count = 0;
    fade_count = -1; /* disable fade */
    fade_frames = 1;

    /* The main decoder loop */
        
    while (!endofstream) {
        ci->yield();
        if (ci->stop_codec || ci->new_track) {
            break;
        }
        
        /* do we need to loop? */
        if (bufoff >= end_adr-18*channels && looping) {
            DEBUGF("ADX: loop!\n");
            /* check for endless looping */
            if (ci->global_settings->repeat_mode==REPEAT_ONE) {
                loop_count=0;
                fade_count = -1; /* disable fade */
            } else {
                /* otherwise start fade after LOOP_TIMES loops */
                loop_count++;
                if (loop_count >= LOOP_TIMES && fade_count < 0) {
                    /* frames to fade over */
                    fade_frames = FADE_LENGTH*ci->id3->frequency/32/1000;
                    /* volume relative to fade_frames */
                    fade_count = fade_frames;
                    DEBUGF("ADX: fade_frames = %d\n",fade_frames);
                }
            }
            bufoff = start_adr;
        }

        /* do we need to seek? */
        if (ci->seek_time) {
            uint32_t newpos;
            
            DEBUGF("ADX: seek to %dms\n",ci->seek_time);

            endofstream = 0;
            loop_count = 0;
            fade_count = -1; /* disable fade */
            fade_frames = 1;

            newpos = (((uint64_t)avgbytespersec*(ci->seek_time - 1))
                      / (1000LL*18*channels))*(18*channels);
            bufoff = chanstart + newpos;
            while (bufoff > end_adr-18*channels) {
                bufoff-=end_adr-start_adr;
                loop_count++;
            }
            ci->seek_complete();
        }

        if (bufoff>ci->filesize-channels*18) break; /* End of stream */
        
        /* dance with the devil in the pale moonlight */
        if ((bufoff > ci->curpos + (off_t)bufsize - channels*18) ||
            bufoff < ci->curpos) {
            DEBUGF("ADX: requesting another buffer at %x size %x\n",
                bufoff,ci->filesize-bufoff);
            ci->seek_buffer(bufoff);
            buf = ci->request_buffer(&n, ci->filesize-bufoff);
            bufsize = n;
            DEBUGF("ADX: read size = %x\n",bufsize);
            if ((off_t)bufsize < channels*18) {
                /* if we can't get a full frame, just request a single
                   frame (should be able to fit it in the guard buffer) */
                DEBUGF("ADX: requesting single frame at %x\n",bufoff);
                buf = ci->request_buffer(&n, channels*18);
                bufsize=n;
                DEBUGF("ADX: read size = %x\n",bufsize);


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