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Consolidate almost identical code in pcmbuf.c

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23318 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jeffrey Goode 2009-10-23 01:01:00 +00:00
parent 07e8647d88
commit 96bb9efdb7
1 changed files with 11 additions and 70 deletions
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81
apps/pcmbuf.c
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@ -687,7 +687,7 @@ static void crossfade_start(void)
}
/* Returns the number of bytes _NOT_ mixed */
static size_t crossfade_fade_mix(int factor, const char *buf, size_t fade_rem)
static size_t crossfade_mix(int factor, const char *buf, size_t length)
{
const int16_t *input_buf = (const int16_t *)buf;
int16_t *output_buf = (int16_t *)(crossfade_chunk->addr);
@ -695,49 +695,16 @@ static size_t crossfade_fade_mix(int factor, const char *buf, size_t fade_rem)
output_buf = &output_buf[crossfade_sample];
int32_t sample;
while (fade_rem)
{
/* fade left and right channel at once to keep buffer alignment */
sample = *input_buf++;
sample = ((sample * factor) >> 8) + *output_buf;
*output_buf++ = clip_sample_16(sample);
sample = *input_buf++;
sample = ((sample * factor) >> 8) + *output_buf;
*output_buf++ = clip_sample_16(sample);
fade_rem -= 4; /* 2 samples, each 16 bit -> 4 bytes */
if (output_buf >= chunk_end)
{
crossfade_chunk = crossfade_chunk->link;
if (!crossfade_chunk)
return fade_rem;
output_buf = (int16_t *)crossfade_chunk->addr;
chunk_end = SKIPBYTES(output_buf, crossfade_chunk->size);
}
}
crossfade_sample = output_buf - (int16_t *)crossfade_chunk->addr;
return 0;
}
/* Returns the number of bytes _NOT_ mixed */
static size_t crossfade_mix(const char *buf, size_t length)
{
const int16_t *input_buf = (const int16_t *)buf;
int16_t *output_buf = (int16_t *)crossfade_chunk->addr;
int16_t *chunk_end = SKIPBYTES(output_buf, crossfade_chunk->size);
output_buf = &output_buf[crossfade_sample];
int32_t sample;
while (length)
{
/* fade left and right channel at once to keep buffer alignment */
sample = *input_buf++ + *output_buf;
*output_buf++ = clip_sample_16(sample);
sample = *input_buf++ + *output_buf;
*output_buf++ = clip_sample_16(sample);
int i;
for (i = 0; i < 2; i++)
{
sample = *input_buf++;
sample = ((sample * factor) >> 8) + *output_buf;
*output_buf++ = clip_sample_16(sample);
}
length -= 4; /* 2 samples, each 16 bit -> 4 bytes */
@ -746,7 +713,6 @@ static size_t crossfade_mix(const char *buf, size_t length)
crossfade_chunk = crossfade_chunk->link;
if (!crossfade_chunk)
return length;
output_buf = (int16_t *)crossfade_chunk->addr;
chunk_end = SKIPBYTES(output_buf, crossfade_chunk->size);
}
@ -796,32 +762,28 @@ static void flush_crossfade(char *buf, size_t length)
{
/* Mix the data */
size_t fade_total = fade_rem;
fade_rem = crossfade_fade_mix(factor, buf, fade_rem);
fade_rem = crossfade_mix(factor, buf, fade_rem);
length -= fade_total - fade_rem;
buf += fade_total - fade_rem;
if (!length)
return;
if (!fade_rem)
goto fade_done;
}
samples = fade_rem / 2;
input_buf = (int16_t *)buf;
/* Fade remaining samples in place */
while (samples)
while (samples--)
{
int32_t sample = *input_buf;
*input_buf++ = (sample * factor) >> 8;
samples--;
}
}
fade_done:
if (crossfade_chunk)
{
/* Mix the data */
size_t mix_total = length;
length = crossfade_mix(buf, length);
length = crossfade_mix(256, buf, length);
buf += mix_total - length;
if (!length)
return;
@ -959,27 +921,6 @@ void pcmbuf_write_complete(int count)
}
}
#if 0
bool pcmbuf_insert_buffer(char *buf, int count)
{
size_t length = (size_t)(unsigned int)count << 2;
if (crossfade_active)
{
flush_crossfade(buf, length);
if (!(crossfade_fade_in_rem || crossfade_chunk))
crossfade_active = false;
}
else
{
if (!prepare_insert(length))
return false;
pcmbuf_flush_buffer(buf, length);
}
return true;
}
#endif
#ifndef HAVE_HARDWARE_BEEP
#define MINIBUF_SAMPLES (NATIVE_FREQUENCY / 1000 * KEYCLICK_DURATION)
#define MINIBUF_SIZE (MINIBUF_SAMPLES*4)