149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
|
|
* Copyright (C) 2003-2009 The Music Player Daemon Project
|
|
* http://www.musicpd.org
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "pcm_convert.h"
|
|
#include "pcm_channels.h"
|
|
#include "pcm_format.h"
|
|
#include "audio_format.h"
|
|
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
#include <glib.h>
|
|
|
|
#undef G_LOG_DOMAIN
|
|
#define G_LOG_DOMAIN "pcm"
|
|
|
|
void pcm_convert_init(struct pcm_convert_state *state)
|
|
{
|
|
memset(state, 0, sizeof(*state));
|
|
|
|
pcm_resample_init(&state->resample);
|
|
pcm_dither_24_init(&state->dither);
|
|
|
|
pcm_buffer_init(&state->format_buffer);
|
|
pcm_buffer_init(&state->channels_buffer);
|
|
}
|
|
|
|
void pcm_convert_deinit(struct pcm_convert_state *state)
|
|
{
|
|
pcm_resample_deinit(&state->resample);
|
|
|
|
pcm_buffer_deinit(&state->format_buffer);
|
|
pcm_buffer_deinit(&state->channels_buffer);
|
|
}
|
|
|
|
static const int16_t *
|
|
pcm_convert_16(struct pcm_convert_state *state,
|
|
const struct audio_format *src_format,
|
|
const void *src_buffer, size_t src_size,
|
|
const struct audio_format *dest_format,
|
|
size_t *dest_size_r)
|
|
{
|
|
const int16_t *buf;
|
|
size_t len;
|
|
|
|
assert(dest_format->bits == 16);
|
|
|
|
buf = pcm_convert_to_16(&state->format_buffer, &state->dither,
|
|
src_format->bits, src_buffer, src_size,
|
|
&len);
|
|
if (!buf)
|
|
g_error("pcm_convert_to_16() failed");
|
|
|
|
if (src_format->channels != dest_format->channels) {
|
|
buf = pcm_convert_channels_16(&state->channels_buffer,
|
|
dest_format->channels,
|
|
src_format->channels,
|
|
buf, len, &len);
|
|
if (!buf)
|
|
g_error("pcm_convert_channels_16() failed");
|
|
}
|
|
|
|
if (src_format->sample_rate != dest_format->sample_rate)
|
|
buf = pcm_resample_16(&state->resample,
|
|
dest_format->channels,
|
|
src_format->sample_rate, buf, len,
|
|
dest_format->sample_rate,
|
|
&len);
|
|
|
|
*dest_size_r = len;
|
|
return buf;
|
|
}
|
|
|
|
static const int32_t *
|
|
pcm_convert_24(struct pcm_convert_state *state,
|
|
const struct audio_format *src_format,
|
|
const void *src_buffer, size_t src_size,
|
|
const struct audio_format *dest_format,
|
|
size_t *dest_size_r)
|
|
{
|
|
const int32_t *buf;
|
|
size_t len;
|
|
|
|
assert(dest_format->bits == 24);
|
|
|
|
buf = pcm_convert_to_24(&state->format_buffer, src_format->bits,
|
|
src_buffer, src_size, &len);
|
|
if (!buf)
|
|
g_error("pcm_convert_to_24() failed");
|
|
|
|
if (src_format->channels != dest_format->channels) {
|
|
buf = pcm_convert_channels_24(&state->channels_buffer,
|
|
dest_format->channels,
|
|
src_format->channels,
|
|
buf, len, &len);
|
|
if (!buf)
|
|
g_error("pcm_convert_channels_24() failed");
|
|
}
|
|
|
|
if (src_format->sample_rate != dest_format->sample_rate)
|
|
buf = pcm_resample_24(&state->resample,
|
|
dest_format->channels,
|
|
src_format->sample_rate, buf, len,
|
|
dest_format->sample_rate,
|
|
&len);
|
|
|
|
*dest_size_r = len;
|
|
return buf;
|
|
}
|
|
|
|
const void *
|
|
pcm_convert(struct pcm_convert_state *state,
|
|
const struct audio_format *src_format,
|
|
const void *src, size_t src_size,
|
|
const struct audio_format *dest_format,
|
|
size_t *dest_size_r)
|
|
{
|
|
switch (dest_format->bits) {
|
|
case 16:
|
|
return pcm_convert_16(state,
|
|
src_format, src, src_size,
|
|
dest_format, dest_size_r);
|
|
|
|
case 24:
|
|
return pcm_convert_24(state,
|
|
src_format, src, src_size,
|
|
dest_format, dest_size_r);
|
|
|
|
default:
|
|
g_error("cannot convert to %u bit\n", dest_format->bits);
|
|
return 0;
|
|
}
|
|
}
|