276 lines
8.8 KiB
C
276 lines
8.8 KiB
C
/***************************************************************************
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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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* $Id$
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*
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* Copyright (c) 2005 Jvo Studer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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/* Macro that sign extends an unsigned byte */
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#define SE(x) ((int32_t)((int8_t)(x)))
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/* This codec supports AIFF files with the following formats:
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* - PCM, 8, 16 and 24 bits, mono or stereo
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*/
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enum
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{
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AIFF_FORMAT_PCM = 0x0001, /* AIFF PCM Format (big endian) */
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IEEE_FORMAT_FLOAT = 0x0003, /* IEEE Float */
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AIFF_FORMAT_ALAW = 0x0004, /* AIFC ALaw compressed */
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AIFF_FORMAT_ULAW = 0x0005 /* AIFC uLaw compressed */
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};
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/* Maximum number of bytes to process in one iteration */
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/* for 44.1kHz stereo 16bits, this represents 0.023s ~= 1/50s */
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#define AIF_CHUNK_SIZE (1024*2)
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static int32_t samples[AIF_CHUNK_SIZE] IBSS_ATTR;
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enum codec_status codec_main(void)
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{
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uint32_t numbytes, bytesdone;
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uint16_t num_channels = 0;
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uint32_t num_sample_frames = 0;
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uint16_t sample_size = 0;
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uint32_t sample_rate = 0;
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uint32_t i;
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size_t n;
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int bufcount;
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int endofstream;
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unsigned char *buf;
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uint8_t *aifbuf;
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long chunksize;
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uint32_t offset2snd = 0;
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uint16_t block_size = 0;
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uint32_t avgbytespersec = 0;
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off_t firstblockposn; /* position of the first block in file */
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/* Generic codec initialisation */
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ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
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ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512);
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next_track:
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if (codec_init()) {
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i = CODEC_ERROR;
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goto exit;
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}
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while (!*ci->taginfo_ready && !ci->stop_codec)
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ci->sleep(1);
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codec_set_replaygain(ci->id3);
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/* assume the AIFF header is less than 1024 bytes */
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buf = ci->request_buffer(&n, 1024);
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if (n < 54) {
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i = CODEC_ERROR;
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goto done;
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}
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if ((memcmp(buf, "FORM", 4) != 0) || (memcmp(&buf[8], "AIFF", 4) != 0)) {
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i = CODEC_ERROR;
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goto done;
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}
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buf += 12;
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n -= 12;
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numbytes = 0;
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/* read until 'SSND' chunk, which typically is last */
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while (numbytes == 0 && n >= 8) {
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/* chunkSize */
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i = ((buf[4]<<24)|(buf[5]<<16)|(buf[6]<<8)|buf[7]);
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if (memcmp(buf, "COMM", 4) == 0) {
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if (i < 18) {
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DEBUGF("CODEC_ERROR: 'COMM' chunk size=%lu < 18\n",
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(unsigned long)i);
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i = CODEC_ERROR;
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goto done;
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}
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/* num_channels */
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num_channels = ((buf[8]<<8)|buf[9]);
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/* num_sample_frames */
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num_sample_frames = ((buf[10]<<24)|(buf[11]<<16)|(buf[12]<<8)
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|buf[13]);
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/* sample_size */
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sample_size = ((buf[14]<<8)|buf[15]);
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/* sample_rate (don't use last 4 bytes, only integer fs) */
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if (buf[16] != 0x40) {
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DEBUGF("CODEC_ERROR: weird sampling rate (no @)\n");
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i = CODEC_ERROR;
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goto done;
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}
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sample_rate = ((buf[18]<<24)|(buf[19]<<16)|(buf[20]<<8)|buf[21])+1;
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sample_rate = sample_rate >> (16 + 14 - buf[17]);
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/* calc average bytes per second */
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avgbytespersec = sample_rate*num_channels*sample_size/8;
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} else if (memcmp(buf, "SSND", 4)==0) {
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if (sample_size == 0) {
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DEBUGF("CODEC_ERROR: unsupported chunk order\n");
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i = CODEC_ERROR;
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goto done;
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}
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/* offset2snd */
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offset2snd = (buf[8]<<24)|(buf[9]<<16)|(buf[10]<<8)|buf[11];
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/* block_size */
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block_size = (buf[12]<<24)|(buf[13]<<16)|(buf[14]<<8)|buf[15];
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if (block_size == 0)
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block_size = num_channels*sample_size;
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numbytes = i - 8 - offset2snd;
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i = 8 + offset2snd; /* advance to the beginning of data */
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} else {
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DEBUGF("unsupported AIFF chunk: '%c%c%c%c', size=%lu\n",
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buf[0], buf[1], buf[2], buf[3], (unsigned long)i);
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}
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if (i & 0x01) /* odd chunk sizes must be padded */
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i++;
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buf += i + 8;
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if (n < (i + 8)) {
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DEBUGF("CODEC_ERROR: AIFF header size > 1024\n");
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i = CODEC_ERROR;
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goto done;
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}
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n -= i + 8;
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} /* while 'SSND' */
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if (num_channels == 0) {
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DEBUGF("CODEC_ERROR: 'COMM' chunk not found or 0-channels file\n");
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i = CODEC_ERROR;
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goto done;
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}
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if (numbytes == 0) {
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DEBUGF("CODEC_ERROR: 'SSND' chunk not found or has zero length\n");
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i = CODEC_ERROR;
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goto done;
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}
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if (sample_size > 24) {
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DEBUGF("CODEC_ERROR: PCM with more than 24 bits per sample "
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"is unsupported\n");
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i = CODEC_ERROR;
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goto done;
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}
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ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
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if (num_channels == 2) {
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ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
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} else if (num_channels == 1) {
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ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
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} else {
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DEBUGF("CODEC_ERROR: more than 2 channels unsupported\n");
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i = CODEC_ERROR;
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goto done;
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}
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firstblockposn = 1024 - n;
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ci->advance_buffer(firstblockposn);
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/* The main decoder loop */
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bytesdone = 0;
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ci->set_elapsed(0);
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endofstream = 0;
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/* chunksize is computed so that one chunk is about 1/50s.
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* this make 4096 for 44.1kHz 16bits stereo.
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* It also has to be a multiple of blockalign */
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chunksize = (1 + avgbytespersec/(50*block_size))*block_size;
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/* check that the output buffer is big enough (convert to samplespersec,
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then round to the block_size multiple below) */
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if (((uint64_t)chunksize*ci->id3->frequency*num_channels*2)
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/(uint64_t)avgbytespersec >= AIF_CHUNK_SIZE) {
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chunksize = ((uint64_t)AIF_CHUNK_SIZE*avgbytespersec
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/((uint64_t)ci->id3->frequency*num_channels*2
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*block_size))*block_size;
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}
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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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if (ci->seek_time) {
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uint32_t newpos;
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/* use avgbytespersec to round to the closest blockalign multiple,
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add firstblockposn. 64-bit casts to avoid overflows. */
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newpos = (((uint64_t)avgbytespersec*(ci->seek_time - 1))
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/(1000LL*block_size))*block_size;
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if (newpos > numbytes)
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break;
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if (ci->seek_buffer(firstblockposn + newpos))
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bytesdone = newpos;
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ci->seek_complete();
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}
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aifbuf = (uint8_t *)ci->request_buffer(&n, chunksize);
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if (n == 0)
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break; /* End of stream */
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if (bytesdone + n > numbytes) {
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n = numbytes - bytesdone;
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endofstream = 1;
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}
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if (sample_size > 24) {
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for (i = 0; i < n; i += 4) {
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samples[i/4] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13)
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|(aifbuf[i + 2]<<5)|(aifbuf[i + 3]>>3);
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}
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bufcount = n >> 2;
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} else if (sample_size > 16) {
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for (i = 0; i < n; i += 3) {
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samples[i/3] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13)
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|(aifbuf[i + 2]<<5);
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}
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bufcount = n/3;
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} else if (sample_size > 8) {
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for (i = 0; i < n; i += 2)
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samples[i/2] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13);
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bufcount = n >> 1;
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} else {
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for (i = 0; i < n; i++)
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samples[i] = SE(aifbuf[i]) << 21;
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bufcount = n;
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}
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if (num_channels == 2)
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bufcount >>= 1;
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ci->pcmbuf_insert(samples, NULL, bufcount);
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ci->advance_buffer(n);
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bytesdone += n;
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if (bytesdone >= numbytes)
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endofstream = 1;
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ci->set_elapsed(bytesdone*1000LL/avgbytespersec);
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}
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i = CODEC_OK;
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done:
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if (ci->request_next_track())
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goto next_track;
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exit:
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return i;
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}
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