50a6ca39ad
This is to a) to cleanup firmware/common and firmware/include a bit, but also b) for Rockbox as an application which should use the host system's c library and headers, separating makes it easy to exclude our files from the build. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25850 a1c6a512-1295-4272-9138-f99709370657
281 lines
8 KiB
C
281 lines
8 KiB
C
/*
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demac - A Monkey's Audio decoder
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$Id$
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Copyright (C) Dave Chapman 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
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*/
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/*
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This example is intended to demonstrate how the decoder can be used in
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embedded devices - there is no usage of dynamic memory (i.e. no
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malloc/free) and small buffer sizes are chosen to minimise both the
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memory usage and decoding latency.
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This implementation requires the following memory and supports decoding of all APE files up to 24-bit Stereo.
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32768 - data from the input stream to be presented to the decoder in one contiguous chunk.
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18432 - decoding buffer (left channel)
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18432 - decoding buffer (right channel)
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17408+5120+2240 - buffers used for filter histories (compression levels 2000-5000)
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In addition, this example uses a static 27648 byte buffer as temporary
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storage for outputting the data to a WAV file but that could be
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avoided by writing the decoded data one sample at a time.
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*/
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#include <stdio.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include "demac.h"
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#include "wavwrite.h"
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#ifndef __WIN32__
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#define O_BINARY 0
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#endif
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#define CALC_CRC 1
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#define BLOCKS_PER_LOOP 4608
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#define MAX_CHANNELS 2
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#define MAX_BYTESPERSAMPLE 3
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#define INPUT_CHUNKSIZE (32*1024)
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#ifndef MIN
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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/* 4608*2*3 = 27648 bytes */
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static unsigned char wavbuffer[BLOCKS_PER_LOOP*MAX_CHANNELS*MAX_BYTESPERSAMPLE];
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/* 4608*4 = 18432 bytes per channel */
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static int32_t decoded0[BLOCKS_PER_LOOP];
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static int32_t decoded1[BLOCKS_PER_LOOP];
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/* We assume that 32KB of compressed data is enough to extract up to
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27648 bytes of decompressed data. */
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static unsigned char inbuffer[INPUT_CHUNKSIZE];
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int ape_decode(char* infile, char* outfile)
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{
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int fd;
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int fdwav;
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int currentframe;
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int nblocks;
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int bytesconsumed;
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struct ape_ctx_t ape_ctx;
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int i, n;
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unsigned char* p;
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int bytesinbuffer;
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int blockstodecode;
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int res;
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int firstbyte;
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int16_t sample16;
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int32_t sample32;
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uint32_t frame_crc;
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int crc_errors = 0;
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fd = open(infile,O_RDONLY|O_BINARY);
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if (fd < 0) return -1;
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/* Read the file headers to populate the ape_ctx struct */
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if (ape_parseheader(fd,&ape_ctx) < 0) {
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printf("Cannot read header\n");
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close(fd);
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return -1;
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}
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if ((ape_ctx.fileversion < APE_MIN_VERSION) || (ape_ctx.fileversion > APE_MAX_VERSION)) {
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printf("Unsupported file version - %.2f\n", ape_ctx.fileversion/1000.0);
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close(fd);
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return -2;
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}
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//ape_dumpinfo(&ape_ctx);
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printf("Decoding file - v%.2f, compression level %d\n",ape_ctx.fileversion/1000.0,ape_ctx.compressiontype);
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/* Open the WAV file and write a canonical 44-byte WAV header
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based on the audio format information in the ape_ctx struct.
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NOTE: This example doesn't write the original WAV header and
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tail data which are (optionally) stored in the APE file.
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*/
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fdwav = open_wav(&ape_ctx,outfile);
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currentframe = 0;
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/* Initialise the buffer */
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lseek(fd, ape_ctx.firstframe, SEEK_SET);
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bytesinbuffer = read(fd, inbuffer, INPUT_CHUNKSIZE);
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firstbyte = 3; /* Take account of the little-endian 32-bit byte ordering */
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/* The main decoding loop - we decode the frames a small chunk at a time */
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while (currentframe < ape_ctx.totalframes)
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{
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/* Calculate how many blocks there are in this frame */
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if (currentframe == (ape_ctx.totalframes - 1))
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nblocks = ape_ctx.finalframeblocks;
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else
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nblocks = ape_ctx.blocksperframe;
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ape_ctx.currentframeblocks = nblocks;
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/* Initialise the frame decoder */
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init_frame_decoder(&ape_ctx, inbuffer, &firstbyte, &bytesconsumed);
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/* Update buffer */
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memmove(inbuffer,inbuffer + bytesconsumed, bytesinbuffer - bytesconsumed);
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bytesinbuffer -= bytesconsumed;
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n = read(fd, inbuffer + bytesinbuffer, INPUT_CHUNKSIZE - bytesinbuffer);
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bytesinbuffer += n;
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#if CALC_CRC
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frame_crc = ape_initcrc();
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#endif
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/* Decode the frame a chunk at a time */
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while (nblocks > 0)
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{
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blockstodecode = MIN(BLOCKS_PER_LOOP, nblocks);
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if ((res = decode_chunk(&ape_ctx, inbuffer, &firstbyte,
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&bytesconsumed,
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decoded0, decoded1,
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blockstodecode)) < 0)
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{
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/* Frame decoding error, abort */
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close(fd);
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return res;
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}
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/* Convert the output samples to WAV format and write to output file */
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p = wavbuffer;
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if (ape_ctx.bps == 8) {
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for (i = 0 ; i < blockstodecode ; i++)
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{
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/* 8 bit WAV uses unsigned samples */
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*(p++) = (decoded0[i] + 0x80) & 0xff;
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if (ape_ctx.channels == 2) {
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*(p++) = (decoded1[i] + 0x80) & 0xff;
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}
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}
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} else if (ape_ctx.bps == 16) {
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for (i = 0 ; i < blockstodecode ; i++)
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{
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sample16 = decoded0[i];
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*(p++) = sample16 & 0xff;
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*(p++) = (sample16 >> 8) & 0xff;
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if (ape_ctx.channels == 2) {
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sample16 = decoded1[i];
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*(p++) = sample16 & 0xff;
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*(p++) = (sample16 >> 8) & 0xff;
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}
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}
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} else if (ape_ctx.bps == 24) {
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for (i = 0 ; i < blockstodecode ; i++)
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{
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sample32 = decoded0[i];
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*(p++) = sample32 & 0xff;
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*(p++) = (sample32 >> 8) & 0xff;
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*(p++) = (sample32 >> 16) & 0xff;
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if (ape_ctx.channels == 2) {
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sample32 = decoded1[i];
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*(p++) = sample32 & 0xff;
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*(p++) = (sample32 >> 8) & 0xff;
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*(p++) = (sample32 >> 16) & 0xff;
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}
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}
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}
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#if CALC_CRC
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frame_crc = ape_updatecrc(wavbuffer, p - wavbuffer, frame_crc);
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#endif
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write(fdwav,wavbuffer,p - wavbuffer);
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/* Update the buffer */
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memmove(inbuffer,inbuffer + bytesconsumed, bytesinbuffer - bytesconsumed);
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bytesinbuffer -= bytesconsumed;
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n = read(fd, inbuffer + bytesinbuffer, INPUT_CHUNKSIZE - bytesinbuffer);
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bytesinbuffer += n;
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/* Decrement the block count */
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nblocks -= blockstodecode;
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}
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#if CALC_CRC
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frame_crc = ape_finishcrc(frame_crc);
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if (ape_ctx.CRC != frame_crc)
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{
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fprintf(stderr,"CRC error in frame %d\n",currentframe);
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crc_errors++;
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}
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#endif
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currentframe++;
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}
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close(fd);
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close(fdwav);
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if (crc_errors > 0)
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return -1;
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else
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return 0;
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}
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int main(int argc, char* argv[])
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{
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int res;
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if (argc != 3) {
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fprintf(stderr,"Usage: demac infile.ape outfile.wav\n");
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return 0;
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}
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res = ape_decode(argv[1], argv[2]);
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if (res < 0)
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{
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fprintf(stderr,"DECODING ERROR %d, ABORTING\n", res);
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}
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else
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{
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fprintf(stderr,"DECODED OK - NO CRC ERRORS.\n");
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}
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return 0;
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}
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