344 lines
11 KiB
C
344 lines
11 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2006 Adam Gashlin (hcs)
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "codeclib.h"
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#include "inttypes.h"
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CODEC_HEADER
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struct codec_api *rb;
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/* Maximum number of bytes to process in one iteration */
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#define WAV_CHUNK_SIZE (1024*2)
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/* Volume for ADX decoder */
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#define BASE_VOL 0x2000
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/* Number of times to loop looped tracks when repeat is disabled */
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#define LOOP_TIMES 2
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/* Length of fade-out for looped tracks (milliseconds) */
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#define FADE_LENGTH 10000L
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static int16_t samples[WAV_CHUNK_SIZE] IBSS_ATTR;
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/* this is the codec entry point */
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enum codec_status codec_start(struct codec_api *api)
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{
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struct codec_api *ci;
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int channels;
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int sampleswritten, i;
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uint8_t *buf;
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int32_t ch1_1, ch1_2, ch2_1, ch2_2; /* ADPCM history */
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size_t n, bufsize;
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int endofstream; /* end of stream flag */
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uint32_t avgbytespersec;
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int looping; /* looping flag */
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int loop_count; /* number of loops done so far */
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int fade_count; /* countdown for fadeout */
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int fade_frames; /* length of fade in frames */
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off_t start_adr, end_adr; /* loop points */
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off_t chanstart, bufoff;
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/* Generic codec initialisation */
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rb = api;
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ci = api;
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/* we only render 16 bits */
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ci->configure(DSP_SET_SAMPLE_DEPTH, (long *)16);
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/*ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*256));*/
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ci->configure(DSP_DITHER, (bool *)false);
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next_track:
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DEBUGF("ADX: next_track\n");
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if (codec_init(api)) {
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return CODEC_ERROR;
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}
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DEBUGF("ADX: after init\n");
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/* init history */
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ch1_1=ch1_2=ch2_1=ch2_2=0;
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/* wait for track info to load */
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while (!*ci->taginfo_ready && !ci->stop_codec)
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ci->sleep(1);
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/* Read the entire file (or as much as possible) */
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DEBUGF("ADX: request initial buffer\n");
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ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(ci->filesize));
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ci->seek_buffer(0);
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buf = ci->request_buffer(&n, ci->filesize);
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if (!buf || n < 0x38) {
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return CODEC_ERROR;
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}
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bufsize = n;
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bufoff = 0;
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DEBUGF("ADX: read size = %x\n",bufsize);
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/* Get file header for starting offset, channel count */
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chanstart = ((buf[2] << 8) | buf[3]) + 4;
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channels = buf[7];
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/* useful for seeking and reporting current playback position */
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avgbytespersec = ci->id3->frequency * 18 * channels / 32;
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DEBUGF("avgbytespersec=%d\n",avgbytespersec);
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/* Get loop data */
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looping = 0; start_adr = 0; end_adr = 0;
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if (!memcmp(buf+0x10,"\x01\xF4\x03\x00",4)) {
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/* Soul Calibur 2 style (type 03) */
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DEBUGF("ADX: type 03 found\n");
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/* check if header is too small for loop data */
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if (chanstart-6 < 0x2c) looping=0;
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else {
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looping = (buf[0x18]) ||
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(buf[0x19]) ||
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(buf[0x1a]) ||
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(buf[0x1b]);
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end_adr = (buf[0x28]<<24) |
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(buf[0x29]<<16) |
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(buf[0x2a]<<8) |
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(buf[0x2b]);
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start_adr = (
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(buf[0x1c]<<24) |
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(buf[0x1d]<<16) |
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(buf[0x1e]<<8) |
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(buf[0x1f])
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)/32*channels*18+chanstart;
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}
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} else if (!memcmp(buf+0x10,"\x01\xF4\x04\x00",4)) {
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/* Standard (type 04) */
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DEBUGF("ADX: type 04 found\n");
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/* check if header is too small for loop data */
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if (chanstart-6 < 0x38) looping=0;
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else {
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looping = (buf[0x24]) ||
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(buf[0x25]) ||
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(buf[0x26]) ||
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(buf[0x27]);
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end_adr = (buf[0x34]<<24) |
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(buf[0x35]<<16) |
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(buf[0x36]<<8) |
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buf[0x37];
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start_adr = (
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(buf[0x28]<<24) |
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(buf[0x29]<<16) |
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(buf[0x2a]<<8) |
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(buf[0x2b])
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)/32*channels*18+chanstart;
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}
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} else {
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DEBUGF("ADX: error, couldn't determine ADX type\n");
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return CODEC_ERROR;
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}
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if (looping) {
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DEBUGF("ADX: looped, start: %x end: %x\n",start_adr,end_adr);
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} else {
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DEBUGF("ADX: not looped\n");
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}
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/* advance to first frame */
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/*ci->seek_buffer(chanstart);*/
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DEBUGF("ADX: first frame at %x\n",chanstart);
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bufoff = chanstart;
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/* setup pcm buffer format */
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ci->configure(DSP_SET_FREQUENCY, (long *)(ci->id3->frequency));
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if (channels == 2) {
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ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_INTERLEAVED);
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} else if (channels == 1) {
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ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_MONO);
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} else {
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DEBUGF("ADX CODEC_ERROR: more than 2 channels\n");
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return CODEC_ERROR;
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}
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endofstream = 0;
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loop_count = 0;
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fade_count = -1; /* disable fade */
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fade_frames = 1;
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/* The main decoder loop */
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while (!endofstream) {
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ci->yield();
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if (ci->stop_codec || ci->new_track) {
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break;
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}
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/* do we need to loop? */
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if (bufoff >= end_adr-18*channels && looping) {
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DEBUGF("ADX: loop!\n");
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/* check for endless looping */
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if (ci->global_settings->repeat_mode==REPEAT_ONE) {
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loop_count=0;
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fade_count = -1; /* disable fade */
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} else {
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/* otherwise start fade after LOOP_TIMES loops */
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loop_count++;
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if (loop_count >= LOOP_TIMES && fade_count < 0) {
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/* frames to fade over */
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fade_frames = FADE_LENGTH*ci->id3->frequency/32/1000;
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/* volume relative to fade_frames */
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fade_count = fade_frames;
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DEBUGF("ADX: fade_frames = %d\n",fade_frames);
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}
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}
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bufoff = start_adr;
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}
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/* do we need to seek? */
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if (ci->seek_time) {
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uint32_t newpos;
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DEBUGF("ADX: seek to %dms\n",ci->seek_time);
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endofstream = 0;
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loop_count = 0;
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fade_count = -1; /* disable fade */
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fade_frames = 1;
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newpos = (((uint64_t)avgbytespersec*(ci->seek_time - 1))
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/ (1000LL*18*channels))*(18*channels);
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bufoff = chanstart + newpos;
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while (bufoff > end_adr-18*channels) {
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bufoff-=end_adr-start_adr;
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loop_count++;
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}
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ci->seek_complete();
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}
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if (bufoff>ci->filesize-channels*18) break; /* End of stream */
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/* dance with the devil in the pale moonlight */
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if ((bufoff > ci->curpos + (off_t)bufsize - channels*18) ||
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bufoff < ci->curpos) {
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DEBUGF("ADX: requesting another buffer at %x size %x\n",
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bufoff,ci->filesize-bufoff);
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ci->seek_buffer(bufoff);
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buf = ci->request_buffer(&n, ci->filesize-bufoff);
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bufsize = n;
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DEBUGF("ADX: read size = %x\n",bufsize);
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if ((off_t)bufsize < channels*18) {
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/* if we can't get a full frame, just request a single
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frame (should be able to fit it in the guard buffer) */
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DEBUGF("ADX: requesting single frame at %x\n",bufoff);
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buf = ci->request_buffer(&n, channels*18);
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bufsize=n;
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DEBUGF("ADX: read size = %x\n",bufsize);
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}
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if (!buf) {
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DEBUGF("ADX: couldn't get buffer at %x size %x\n",
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bufoff,ci->filesize-bufoff);
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return CODEC_ERROR;
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}
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buf-=bufoff;
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}
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if (bufsize == 0) break; /* End of stream */
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sampleswritten=0;
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while (
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/* Is there data in the file buffer? */
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((size_t)bufoff <= ci->curpos+bufsize-(18*channels)) &&
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/* Is there space in the output buffer? */
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(sampleswritten <= WAV_CHUNK_SIZE-(32*channels)) &&
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/* Should we be looping? */
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((!looping) || bufoff < end_adr-18*channels)) {
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/* decode 18 bytes to 32 samples (from bero) */
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int32_t scale = ((buf[bufoff] << 8) | (buf[bufoff+1])) * BASE_VOL;
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int32_t ch1_0, d;
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for (i = 2; i < 18; i++)
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{
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d = (buf[bufoff+i] >> 4) & 15;
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if (d & 8) d-= 16;
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ch1_0 = (d*scale + 0x7298L*ch1_1 - 0x3350L*ch1_2) >> 14;
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if (ch1_0 > 32767) ch1_0 = 32767;
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else if (ch1_0 < -32768) ch1_0 = -32768;
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samples[sampleswritten] = ch1_0;
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sampleswritten+=channels;
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ch1_2 = ch1_1; ch1_1 = ch1_0;
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d = buf[bufoff+i] & 15;
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if (d & 8) d -= 16;
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ch1_0 = (d*scale + 0x7298L*ch1_1 - 0x3350L*ch1_2) >> 14;
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if (ch1_0 > 32767) ch1_0 = 32767;
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else if (ch1_0 < -32768) ch1_0 = -32768;
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samples[sampleswritten] = ch1_0;
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sampleswritten+=channels;
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ch1_2 = ch1_1; ch1_1 = ch1_0;
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}
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bufoff+=18;
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if (channels == 2) {
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int32_t scale = ((buf[bufoff] << 8)|(buf[bufoff+1]))*BASE_VOL;
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int32_t ch2_0, d;
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sampleswritten-=63;
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for (i = 2; i < 18; i++)
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{
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d = (buf[bufoff+i] >> 4) & 15;
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if (d & 8) d-= 16;
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ch2_0 = (d*scale + 0x7298L*ch2_1 - 0x3350L*ch2_2) >> 14;
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if (ch2_0 > 32767) ch2_0 = 32767;
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else if (ch2_0 < -32768) ch2_0 = -32768;
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samples[sampleswritten] = ch2_0;
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sampleswritten+=2;
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ch2_2 = ch2_1; ch2_1 = ch2_0;
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d = buf[bufoff+i] & 15;
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if (d & 8) d -= 16;
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ch2_0 = (d*scale + 0x7298L*ch2_1 - 0x3350L*ch2_2) >> 14;
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if (ch2_0 > 32767) ch2_0 = 32767;
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else if (ch2_0 < -32768) ch2_0 = -32768;
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samples[sampleswritten] = ch2_0;
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sampleswritten+=2;
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ch2_2 = ch2_1; ch2_1 = ch2_0;
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}
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bufoff+=18;
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sampleswritten--; /* go back to first channel's next sample */
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}
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if (fade_count>0) {
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fade_count--;
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for (i=0;i<(channels==1?32:64);i++) samples[sampleswritten-i-1]=
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((int32_t)samples[sampleswritten-i-1])*fade_count/fade_frames;
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if (fade_count==0) {endofstream=1; break;}
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}
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}
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/* 2 bytes per sample */
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while (!ci->pcmbuf_insert((char *)samples, sampleswritten*2))
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ci->yield();
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ci->set_elapsed(
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((end_adr-start_adr)*loop_count + bufoff-chanstart)*
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1000LL/avgbytespersec);
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}
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if (ci->request_next_track())
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goto next_track;
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return CODEC_OK;
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}
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