static
unsigned int pack_pcm(unsigned char *data, unsigned int nsamples,
mad_fixed_t const *left, mad_fixed_t const *right,
int resolution, struct audio_stats *stats)
{
static struct audio_dither left_dither, right_dither;
unsigned char const *start;
register signed long sample0, sample1;
int effective, bytes;
start = data;
effective = (resolution > 24) ? 24 : resolution;
bytes = resolution / 8;
if (right) { /* stereo */
while (nsamples--) {
#ifdef LINEAR_DITHER
sample0 = audio_linear_dither(effective, *left++, &left_dither, stats);
sample1 = audio_linear_dither(effective, *right++, &right_dither, stats);
#else
sample0 = audio_linear_round(effective, *left++, stats);
sample1 = audio_linear_round(effective, *right++, stats);
#endif
switch (resolution) {
case 8:
data[0] = sample0 + 0x80;
data[1] = sample1 + 0x80;
break;
case 32:
sample0 <<= 8;
sample1 <<= 8;
data[ 3] = sample0 >> 24;
data[bytes + 3] = sample1 >> 24;
case 24:
data[ 2] = sample0 >> 16;
data[bytes + 2] = sample1 >> 16;
case 16:
data[ 1] = sample0 >> 8;
data[bytes + 1] = sample1 >> 8;
data[ 0] = sample0 >> 0;
data[bytes + 0] = sample1 >> 0;
}
data += bytes * 2;
}
}
else { /* mono */
while (nsamples--) {
static
int play(struct audio_play *play)
{
unsigned int len;
mad_fixed_t const *left, *right;
unsigned long mask;
len = play->nsamples;
left = play->samples[0];
right = play->samples[1];
mask = (1L << bitdepth) - 1;
switch (play->mode) {
case AUDIO_MODE_ROUND:
while (len--) {
fprintf(outfile, format_str,
audio_linear_round(bitdepth, *left++, play->stats) & mask);
if (right) {
fprintf(outfile, format_str,
audio_linear_round(bitdepth, *right++, play->stats) & mask);
}
}
break;
case AUDIO_MODE_DITHER:
{
static struct audio_dither left_dither, right_dither;
while (len--) {
fprintf(outfile, format_str,
audio_linear_dither(bitdepth, *left++, &left_dither,
play->stats) & mask);
if (right) {
fprintf(outfile, format_str,
audio_linear_dither(bitdepth, *right++, &right_dither,
play->stats) & mask);
}
}
}
break;
}
return 0;
}
data[bytes + 2] = sample1 >> 16;
case 16:
data[ 1] = sample0 >> 8;
data[bytes + 1] = sample1 >> 8;
data[ 0] = sample0 >> 0;
data[bytes + 0] = sample1 >> 0;
}
data += bytes * 2;
}
}
else { /* mono */
while (nsamples--) {
#ifdef LINEAR_DITHER
sample0 = audio_linear_dither(effective, *left++, &left_dither, stats);
#else
sample0 = audio_linear_round(effective, *left++, stats);
#endif
switch (resolution) {
case 8:
data[0] = sample0 + 0x80;
break;
case 32:
sample0 <<= 8;
data[3] = sample0 >> 24;
case 24:
data[2] = sample0 >> 16;
case 16:
data[1] = sample0 >> 8;
data[0] = sample0 >> 0;
}
data += bytes;
