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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* (c)2004 replayGain code by AliasMrJones
* This project's homepage is: 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 "replay_gain.h"
#include "utils.h"
#include "log.h"
#include "conf.h"
#include "audio_format.h"
#include "os_compat.h"
/* Added 4/14/2004 by AliasMrJones */
int replayGainState = REPLAYGAIN_OFF;
static float replayGainPreamp = 1.0;
void initReplayGainState(void)
{
ConfigParam *param = getConfigParam(CONF_REPLAYGAIN);
if (!param)
return;
if (strcmp(param->value, "track") == 0) {
replayGainState = REPLAYGAIN_TRACK;
} else if (strcmp(param->value, "album") == 0) {
replayGainState = REPLAYGAIN_ALBUM;
} else {
FATAL("replaygain value \"%s\" at line %i is invalid\n",
param->value, param->line);
}
param = getConfigParam(CONF_REPLAYGAIN_PREAMP);
if (param) {
char *test;
float f = strtod(param->value, &test);
if (*test != '\0') {
FATAL("Replaygain preamp \"%s\" is not a number at "
"line %i\n", param->value, param->line);
}
if (f < -15 || f > 15) {
FATAL("Replaygain preamp \"%s\" is not between -15 and"
"15 at line %i\n", param->value, param->line);
}
replayGainPreamp = pow(10, f / 20.0);
}
}
static float computeReplayGainScale(float gain, float peak)
{
float scale;
if (gain == 0.0)
return (1);
scale = pow(10.0, gain / 20.0);
scale *= replayGainPreamp;
if (scale > 15.0)
scale = 15.0;
if (scale * peak > 1.0) {
scale = 1.0 / peak;
}
return (scale);
}
ReplayGainInfo *newReplayGainInfo(void)
{
ReplayGainInfo *ret = xmalloc(sizeof(ReplayGainInfo));
ret->albumGain = 0.0;
ret->albumPeak = 0.0;
ret->trackGain = 0.0;
ret->trackPeak = 0.0;
/* set to -1 so that we know in doReplayGain to compute the scale */
ret->scale = -1.0;
return ret;
}
void freeReplayGainInfo(ReplayGainInfo * info)
{
free(info);
}
void doReplayGain(ReplayGainInfo * info, char *buffer, int bufferSize,
const struct audio_format *format)
{
int16_t *buffer16;
int8_t *buffer8;
int32_t temp32;
float scale;
if (replayGainState == REPLAYGAIN_OFF || !info)
return;
if (info->scale < 0) {
switch (replayGainState) {
case REPLAYGAIN_TRACK:
DEBUG("computing ReplayGain track scale with gain %f, "
"peak %f\n", info->trackGain, info->trackPeak);
info->scale = computeReplayGainScale(info->trackGain,
info->trackPeak);
break;
default:
DEBUG("computing ReplayGain album scale with gain %f, "
"peak %f\n", info->albumGain, info->albumPeak);
info->scale = computeReplayGainScale(info->albumGain,
info->albumPeak);
break;
}
}
if (info->scale <= 1.01 && info->scale >= 0.99)
return;
buffer16 = (int16_t *) buffer;
buffer8 = (int8_t *) buffer;
scale = info->scale;
switch (format->bits) {
case 16:
while (bufferSize > 0) {
temp32 = *buffer16;
temp32 *= scale;
*buffer16 = temp32 > 32767 ? 32767 :
(temp32 < -32768 ? -32768 : temp32);
buffer16++;
bufferSize -= 2;
}
break;
case 8:
while (bufferSize > 0) {
temp32 = *buffer8;
temp32 *= scale;
*buffer8 = temp32 > 127 ? 127 :
(temp32 < -128 ? -128 : temp32);
buffer8++;
bufferSize--;
}
break;
default:
ERROR("%i bits not supported by doReplaygain!\n", format->bits);
}
}
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