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/*
DeaDBeeF - ultimate music player for GNU/Linux systems with X11
Copyright (C) 2009-2010 Alexey Yakovenko <waker@users.sourceforge.net>
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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include "deadbeef.h"
#include "premix.h"
#define trace(...) { fprintf(stderr, __VA_ARGS__); }
//#define trace(fmt,...)
void
pcm_write_sample (const ddb_waveformat_t * restrict inputfmt, const char * restrict input, const ddb_waveformat_t * restrict outputfmt, char * restrict output) {
memcpy (output, input, 2);
}
int
pcm_convert (const ddb_waveformat_t * restrict inputfmt, const char * restrict input, const ddb_waveformat_t * restrict outputfmt, char * restrict output, int inputsize) {
// calculate output size
int inputsamplesize = (inputfmt->bps >> 3) * inputfmt->channels;
int outputsamplesize = (outputfmt->bps >> 3) * outputfmt->channels;
int nsamples = inputsize / inputsamplesize;
uint32_t outchannels = 0;
if (output) {
// build channelmap
int channelmap[32] = {-1};
uint32_t inputbitmask = 1;
for (int i = 0; i < inputfmt->channels; i++) {
// find next input channel
while (inputbitmask < 0x80000000 && !(inputfmt->channelmask & inputbitmask)) {
inputbitmask <<= 1;
}
if (!(inputfmt->channelmask & inputbitmask)) {
trace ("pcm_convert: channelmask doesn't correspond inputfmt (channels=%d, channelmask=%X)!", inputfmt->channels, inputfmt->channelmask);
break;
}
if (outputfmt->channelmask & inputbitmask) {
int o = 0;
uint32_t outputbitmask = 1;
while (outputbitmask < 0x80000000 && (outputfmt->channelmask & outputbitmask) != inputbitmask) {
outputbitmask <<= 1;
o++;
}
if (!(inputfmt->channelmask & outputbitmask)) {
// no corresponding output channel -- ignore
continue;
}
outchannels |= outputbitmask;
channelmap[i] = o; // input channel i going to output channel o
trace ("channelmap[%d]=%d\n", i, o);
}
inputbitmask <<= 1;
}
if (outchannels != outputfmt->channelmask) {
// some of the channels are not used
memset (output, 0, nsamples * outputsamplesize);
}
for (int s = 0; s < nsamples; s++) {
for (int c = 0; c < inputfmt->channels; c++) {
if (channelmap[c] != -1) {
pcm_write_sample (inputfmt, input, outputfmt, output + (outputfmt->bps >> 3) * channelmap[c]);
}
input += inputfmt->bps >> 3;
}
output += outputsamplesize;
}
}
return nsamples * outputsamplesize;
}
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