f40bfc9267
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
281 lines
8 KiB
C
281 lines
8 KiB
C
/*
|
|
|
|
demac - A Monkey's Audio decoder
|
|
|
|
$Id$
|
|
|
|
Copyright (C) Dave Chapman 2007
|
|
|
|
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 program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
This example is intended to demonstrate how the decoder can be used in
|
|
embedded devices - there is no usage of dynamic memory (i.e. no
|
|
malloc/free) and small buffer sizes are chosen to minimise both the
|
|
memory usage and decoding latency.
|
|
|
|
This implementation requires the following memory and supports decoding of all APE files up to 24-bit Stereo.
|
|
|
|
32768 - data from the input stream to be presented to the decoder in one contiguous chunk.
|
|
18432 - decoding buffer (left channel)
|
|
18432 - decoding buffer (right channel)
|
|
|
|
17408+5120+2240 - buffers used for filter histories (compression levels 2000-5000)
|
|
|
|
In addition, this example uses a static 27648 byte buffer as temporary
|
|
storage for outputting the data to a WAV file but that could be
|
|
avoided by writing the decoded data one sample at a time.
|
|
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <inttypes.h>
|
|
#include <stdlib.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
#include "demac.h"
|
|
#include "wavwrite.h"
|
|
|
|
#ifndef __WIN32__
|
|
#define O_BINARY 0
|
|
#endif
|
|
|
|
#define CALC_CRC 1
|
|
|
|
#define BLOCKS_PER_LOOP 4608
|
|
#define MAX_CHANNELS 2
|
|
#define MAX_BYTESPERSAMPLE 3
|
|
|
|
#define INPUT_CHUNKSIZE (32*1024)
|
|
|
|
#ifndef MIN
|
|
#define MIN(a,b) ((a) < (b) ? (a) : (b))
|
|
#endif
|
|
|
|
|
|
/* 4608*2*3 = 27648 bytes */
|
|
static unsigned char wavbuffer[BLOCKS_PER_LOOP*MAX_CHANNELS*MAX_BYTESPERSAMPLE];
|
|
|
|
/* 4608*4 = 18432 bytes per channel */
|
|
static int32_t decoded0[BLOCKS_PER_LOOP];
|
|
static int32_t decoded1[BLOCKS_PER_LOOP];
|
|
|
|
/* We assume that 32KB of compressed data is enough to extract up to
|
|
27648 bytes of decompressed data. */
|
|
|
|
static unsigned char inbuffer[INPUT_CHUNKSIZE];
|
|
|
|
int ape_decode(char* infile, char* outfile)
|
|
{
|
|
int fd;
|
|
int fdwav;
|
|
int currentframe;
|
|
int nblocks;
|
|
int bytesconsumed;
|
|
struct ape_ctx_t ape_ctx;
|
|
int i, n;
|
|
unsigned char* p;
|
|
int bytesinbuffer;
|
|
int blockstodecode;
|
|
int res;
|
|
int firstbyte;
|
|
int16_t sample16;
|
|
int32_t sample32;
|
|
uint32_t frame_crc;
|
|
int crc_errors = 0;
|
|
|
|
fd = open(infile,O_RDONLY|O_BINARY);
|
|
if (fd < 0) return -1;
|
|
|
|
/* Read the file headers to populate the ape_ctx struct */
|
|
if (ape_parseheader(fd,&ape_ctx) < 0) {
|
|
printf("Cannot read header\n");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
if ((ape_ctx.fileversion < APE_MIN_VERSION) || (ape_ctx.fileversion > APE_MAX_VERSION)) {
|
|
printf("Unsupported file version - %.2f\n", ape_ctx.fileversion/1000.0);
|
|
close(fd);
|
|
return -2;
|
|
}
|
|
|
|
//ape_dumpinfo(&ape_ctx);
|
|
|
|
printf("Decoding file - v%.2f, compression level %d\n",ape_ctx.fileversion/1000.0,ape_ctx.compressiontype);
|
|
|
|
/* Open the WAV file and write a canonical 44-byte WAV header
|
|
based on the audio format information in the ape_ctx struct.
|
|
|
|
NOTE: This example doesn't write the original WAV header and
|
|
tail data which are (optionally) stored in the APE file.
|
|
*/
|
|
fdwav = open_wav(&ape_ctx,outfile);
|
|
|
|
currentframe = 0;
|
|
|
|
/* Initialise the buffer */
|
|
lseek(fd, ape_ctx.firstframe, SEEK_SET);
|
|
bytesinbuffer = read(fd, inbuffer, INPUT_CHUNKSIZE);
|
|
firstbyte = 3; /* Take account of the little-endian 32-bit byte ordering */
|
|
|
|
/* The main decoding loop - we decode the frames a small chunk at a time */
|
|
while (currentframe < ape_ctx.totalframes)
|
|
{
|
|
/* Calculate how many blocks there are in this frame */
|
|
if (currentframe == (ape_ctx.totalframes - 1))
|
|
nblocks = ape_ctx.finalframeblocks;
|
|
else
|
|
nblocks = ape_ctx.blocksperframe;
|
|
|
|
ape_ctx.currentframeblocks = nblocks;
|
|
|
|
/* Initialise the frame decoder */
|
|
init_frame_decoder(&ape_ctx, inbuffer, &firstbyte, &bytesconsumed);
|
|
|
|
/* Update buffer */
|
|
memmove(inbuffer,inbuffer + bytesconsumed, bytesinbuffer - bytesconsumed);
|
|
bytesinbuffer -= bytesconsumed;
|
|
|
|
n = read(fd, inbuffer + bytesinbuffer, INPUT_CHUNKSIZE - bytesinbuffer);
|
|
bytesinbuffer += n;
|
|
|
|
#if CALC_CRC
|
|
frame_crc = ape_initcrc();
|
|
#endif
|
|
|
|
/* Decode the frame a chunk at a time */
|
|
while (nblocks > 0)
|
|
{
|
|
blockstodecode = MIN(BLOCKS_PER_LOOP, nblocks);
|
|
|
|
if ((res = decode_chunk(&ape_ctx, inbuffer, &firstbyte,
|
|
&bytesconsumed,
|
|
decoded0, decoded1,
|
|
blockstodecode)) < 0)
|
|
{
|
|
/* Frame decoding error, abort */
|
|
close(fd);
|
|
return res;
|
|
}
|
|
|
|
/* Convert the output samples to WAV format and write to output file */
|
|
p = wavbuffer;
|
|
if (ape_ctx.bps == 8) {
|
|
for (i = 0 ; i < blockstodecode ; i++)
|
|
{
|
|
/* 8 bit WAV uses unsigned samples */
|
|
*(p++) = (decoded0[i] + 0x80) & 0xff;
|
|
|
|
if (ape_ctx.channels == 2) {
|
|
*(p++) = (decoded1[i] + 0x80) & 0xff;
|
|
}
|
|
}
|
|
} else if (ape_ctx.bps == 16) {
|
|
for (i = 0 ; i < blockstodecode ; i++)
|
|
{
|
|
sample16 = decoded0[i];
|
|
*(p++) = sample16 & 0xff;
|
|
*(p++) = (sample16 >> 8) & 0xff;
|
|
|
|
if (ape_ctx.channels == 2) {
|
|
sample16 = decoded1[i];
|
|
*(p++) = sample16 & 0xff;
|
|
*(p++) = (sample16 >> 8) & 0xff;
|
|
}
|
|
}
|
|
} else if (ape_ctx.bps == 24) {
|
|
for (i = 0 ; i < blockstodecode ; i++)
|
|
{
|
|
sample32 = decoded0[i];
|
|
*(p++) = sample32 & 0xff;
|
|
*(p++) = (sample32 >> 8) & 0xff;
|
|
*(p++) = (sample32 >> 16) & 0xff;
|
|
|
|
if (ape_ctx.channels == 2) {
|
|
sample32 = decoded1[i];
|
|
*(p++) = sample32 & 0xff;
|
|
*(p++) = (sample32 >> 8) & 0xff;
|
|
*(p++) = (sample32 >> 16) & 0xff;
|
|
}
|
|
}
|
|
}
|
|
|
|
#if CALC_CRC
|
|
frame_crc = ape_updatecrc(wavbuffer, p - wavbuffer, frame_crc);
|
|
#endif
|
|
write(fdwav,wavbuffer,p - wavbuffer);
|
|
|
|
/* Update the buffer */
|
|
memmove(inbuffer,inbuffer + bytesconsumed, bytesinbuffer - bytesconsumed);
|
|
bytesinbuffer -= bytesconsumed;
|
|
|
|
n = read(fd, inbuffer + bytesinbuffer, INPUT_CHUNKSIZE - bytesinbuffer);
|
|
bytesinbuffer += n;
|
|
|
|
/* Decrement the block count */
|
|
nblocks -= blockstodecode;
|
|
}
|
|
|
|
#if CALC_CRC
|
|
frame_crc = ape_finishcrc(frame_crc);
|
|
|
|
if (ape_ctx.CRC != frame_crc)
|
|
{
|
|
fprintf(stderr,"CRC error in frame %d\n",currentframe);
|
|
crc_errors++;
|
|
}
|
|
#endif
|
|
|
|
currentframe++;
|
|
}
|
|
|
|
close(fd);
|
|
close(fdwav);
|
|
|
|
if (crc_errors > 0)
|
|
return -1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
int res;
|
|
|
|
if (argc != 3) {
|
|
fprintf(stderr,"Usage: demac infile.ape outfile.wav\n");
|
|
return 0;
|
|
}
|
|
|
|
res = ape_decode(argv[1], argv[2]);
|
|
|
|
if (res < 0)
|
|
{
|
|
fprintf(stderr,"DECODING ERROR %d, ABORTING\n", res);
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr,"DECODED OK - NO CRC ERRORS.\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|