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volume: add direct support for S32N, FL64 and U8

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This commit is contained in:
Rémi Denis-Courmont 2012-12-21 22:29:30 +02:00
parent 2c22b194c8
commit f58f22cc31
4 changed files with 124 additions and 55 deletions
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11
modules/audio_mixer/Modules.am
View File

@ -1,6 +1,11 @@
SOURCES_float32_mixer = float32.c
SOURCES_integer_mixer = integer.c
libfloat_mixer_plugin_la_SOURCES = float.c
libfloat_mixer_plugin_la_CFLAGS = $(AM_CFLAGS)
libfloat_mixer_plugin_la_LIBADD = $(AM_LIBADD) $(LIBM)
libinteger_mixer_plugin_la_SOURCES = integer.c
libinteger_mixer_plugin_la_CFLAGS = $(AM_CFLAGS)
libinteger_mixer_plugin_la_LIBADD = $(AM_LIBADD)
libvlc_LTLIBRARIES += \
libfloat32_mixer_plugin.la \
libfloat_mixer_plugin.la \
libinteger_mixer_plugin.la

56
modules/audio_mixer/float32.c → modules/audio_mixer/float.c
View File

@ -39,7 +39,6 @@
* Local prototypes
*****************************************************************************/
static int Create( vlc_object_t * );
static void DoWork( audio_volume_t *, block_t *, float );
/*****************************************************************************
* Module descriptor
@ -52,27 +51,13 @@ vlc_module_begin ()
set_callbacks( Create, NULL )
vlc_module_end ()
/**
* Initializes the mixer
*/
static int Create( vlc_object_t *p_this )
{
audio_volume_t *p_volume = (audio_volume_t *)p_this;
if (p_volume->format != VLC_CODEC_FL32)
return -1;
p_volume->amplify = DoWork;
return 0;
}
/**
* Mixes a new output buffer
*/
static void DoWork( audio_volume_t *p_volume, block_t *p_buffer,
float f_multiplier )
static void FilterFL32( audio_volume_t *p_volume, block_t *p_buffer,
float f_multiplier )
{
if( f_multiplier == 1.0 )
if( f_multiplier == 1.f )
return; /* nothing to do */
float *p = (float *)p_buffer->p_buffer;
@ -81,3 +66,38 @@ static void DoWork( audio_volume_t *p_volume, block_t *p_buffer,
(void) p_volume;
}
static void FilterFL64( audio_volume_t *p_volume, block_t *p_buffer,
float f_multiplier )
{
double *p = (double *)p_buffer->p_buffer;
double mult = f_multiplier;
if( mult == 1. )
return; /* nothing to do */
for( size_t i = p_buffer->i_buffer / sizeof(float); i > 0; i-- )
*(p++) *= mult;
(void) p_volume;
}
/**
* Initializes the mixer
*/
static int Create( vlc_object_t *p_this )
{
audio_volume_t *p_volume = (audio_volume_t *)p_this;
switch (p_volume->format)
{
case VLC_CODEC_FL32:
p_volume->amplify = FilterFL32;
break;
case VLC_CODEC_FL64:
p_volume->amplify = FilterFL64;
break;
default:
return -1;
}
return 0;
}

110
modules/audio_mixer/integer.c
View File

@ -22,6 +22,9 @@
# include "config.h"
#endif
#include <math.h>
#include <limits.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_aout.h>
@ -37,7 +40,74 @@ vlc_module_begin ()
set_callbacks (Activate, NULL)
vlc_module_end ()
static void FilterS16N (audio_volume_t *, block_t *, float);
static void FilterS32N (audio_volume_t *vol, block_t *block, float volume)
{
int32_t *p = (int32_t *)block->p_buffer;
int32_t mult = lroundf (volume * 0x1.p24f);
if (mult == (1 << 24))
return;
for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
{
int64_t s = *p * (int64_t)mult;
if (s >= (INT32_MAX << INT64_C(24)))
*p = INT32_MAX;
else
if (s < (INT32_MIN << INT64_C(24)))
*p = INT32_MIN;
else
*p = s >> INT64_C(24);
p++;
}
(void) vol;
}
static void FilterS16N (audio_volume_t *vol, block_t *block, float volume)
{
int16_t *p = (int16_t *)block->p_buffer;
int16_t mult = lroundf (volume * 0x1.p8f);
if (mult == (1 << 8))
return;
for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
{
int32_t s = *p * (int32_t)mult;
if (s >= (INT16_MAX << 8))
*p = INT16_MAX;
else
if (s < (INT_MIN << 8))
*p = INT16_MIN;
else
*p = s >> 8;
p++;
}
(void) vol;
}
static void FilterU8 (audio_volume_t *vol, block_t *block, float volume)
{
uint8_t *p = (uint8_t *)block->p_buffer;
int16_t mult = lroundf (volume * 0x1.p8f);
if (mult == (1 << 8))
return;
for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
{
int32_t s = (*p - 128) * mult;
if (s >= (INT8_MAX << 8))
*p = 255;
else
if (s < (INT8_MIN << 8))
*p = 0;
else
*p = (s >> 8) + 128;
p++;
}
(void) vol;
}
static int Activate (vlc_object_t *obj)
{
@ -45,43 +115,17 @@ static int Activate (vlc_object_t *obj)
switch (vol->format)
{
case VLC_CODEC_S32N:
vol->amplify = FilterS32N;
break;
case VLC_CODEC_S16N:
vol->amplify = FilterS16N;
break;
case VLC_CODEC_U8:
vol->amplify = FilterU8;
break;
default:
return -1;
}
return 0;
}
static void FilterS16N (audio_volume_t *vol, block_t *block, float volume)
{
int32_t mult = volume * 0x1.p16;
if (mult == 0x10000)
return;
int16_t *p = (int16_t *)block->p_buffer;
if (mult < 0x10000)
{
for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
{
*p = (*p * mult) >> 16;
p++;
}
}
else
{
mult >>= 4;
for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
{
int32_t v = (*p * mult) >> 12;
if (abs (v) > 0x7fff)
v = 0x8000;
*(p++) = v;
}
}
(void) vol;
}

2
po/POTFILES.in
View File

@ -318,7 +318,7 @@ modules/audio_filter/spatializer/revmodel.hpp
modules/audio_filter/spatializer/spatializer.cpp
modules/audio_filter/spatializer/tuning.h
modules/audio_filter/stereo_widen.c
modules/audio_mixer/float32.c
modules/audio_mixer/float.c
modules/audio_mixer/integer.c
modules/audio_output/adummy.c
modules/audio_output/alsa.c