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pcm/Volume: convert to class

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Prepare for adding state.
This commit is contained in:
Max Kellermann
2013-12-22 23:26:52 +01:00
parent d11a0c9f14
commit 8edde7a4b3
8 changed files with 255 additions and 295 deletions
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59
src/filter/ReplayGainFilterPlugin.cxx
View File

@@ -28,6 +28,7 @@
#include "MixerControl.hxx"
#include "pcm/Volume.hxx"
#include "pcm/PcmBuffer.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
@@ -55,8 +56,8 @@ class ReplayGainFilter final : public Filter {
ReplayGainInfo info;
/**
* The current volume, between 0 and a value that may or may not exceed
* #PCM_VOLUME_1.
* About the current volume: it is between 0 and a value that
* may or may not exceed #PCM_VOLUME_1.
*
* If the default value of true is used for replaygain_limit, the
* application of the volume to the signal will never cause clipping.
@@ -66,16 +67,11 @@ class ReplayGainFilter final : public Filter {
* maintain a consistent audio level. Whether clipping will actually
* occur depends on what value the user is using for replaygain_preamp.
*/
unsigned volume;
AudioFormat format;
PcmBuffer buffer;
PcmVolume pv;
public:
ReplayGainFilter()
:mixer(nullptr), mode(REPLAY_GAIN_OFF),
volume(PCM_VOLUME_1) {
:mixer(nullptr), mode(REPLAY_GAIN_OFF) {
info.Clear();
}
@@ -125,6 +121,7 @@ public:
void
ReplayGainFilter::Update()
{
unsigned volume = PCM_VOLUME_1;
if (mode != REPLAY_GAIN_OFF) {
const auto &tuple = info.tuples[mode];
float scale = tuple.CalculateScale(replay_gain_preamp,
@@ -134,8 +131,9 @@ ReplayGainFilter::Update()
"scale=%f\n", (double)scale);
volume = pcm_float_to_volume(scale);
} else
volume = PCM_VOLUME_1;
}
pv.SetVolume(volume);
if (mixer != nullptr) {
/* update the hardware mixer volume */
@@ -160,48 +158,25 @@ replay_gain_filter_init(gcc_unused const config_param &param,
AudioFormat
ReplayGainFilter::Open(AudioFormat &af, gcc_unused Error &error)
{
format = af;
if (!pv.Open(af.format, error))
return AudioFormat::Undefined();
return format;
return af;
}
void
ReplayGainFilter::Close()
{
buffer.Clear();
pv.Close();
}
const void *
ReplayGainFilter::FilterPCM(const void *src, size_t src_size,
size_t *dest_size_r, Error &error)
size_t *dest_size_r, gcc_unused Error &error)
{
*dest_size_r = src_size;
if (volume == PCM_VOLUME_1)
/* optimized special case: 100% volume = no-op */
return src;
void *dest = buffer.Get(src_size);
if (volume <= 0) {
/* optimized special case: 0% volume = memset(0) */
/* XXX is this valid for all sample formats? What
about floating point? */
memset(dest, 0, src_size);
return dest;
}
memcpy(dest, src, src_size);
bool success = pcm_volume(dest, src_size,
format.format,
volume);
if (!success) {
error.Set(replay_gain_domain, "pcm_volume() has failed");
return nullptr;
}
return dest;
const auto dest = pv.Apply({src, src_size});
*dest_size_r = dest.size;
return dest.data;
}
const struct filter_plugin replay_gain_filter_plugin = {

63
src/filter/VolumeFilterPlugin.cxx
View File

@@ -23,8 +23,8 @@
#include "FilterInternal.hxx"
#include "FilterRegistry.hxx"
#include "pcm/Volume.hxx"
#include "pcm/PcmBuffer.hxx"
#include "AudioFormat.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
@@ -32,29 +32,15 @@
#include <string.h>
class VolumeFilter final : public Filter {
/**
* The current volume, from 0 to #PCM_VOLUME_1.
*/
unsigned volume;
AudioFormat format;
PcmBuffer buffer;
PcmVolume pv;
public:
VolumeFilter()
:volume(PCM_VOLUME_1) {}
unsigned GetVolume() const {
assert(volume <= PCM_VOLUME_1);
return volume;
return pv.GetVolume();
}
void SetVolume(unsigned _volume) {
assert(_volume <= PCM_VOLUME_1);
volume = _volume;
pv.SetVolume(_volume);
}
virtual AudioFormat Open(AudioFormat &af, Error &error) override;
@@ -73,50 +59,27 @@ volume_filter_init(gcc_unused const config_param &param,
}
AudioFormat
VolumeFilter::Open(AudioFormat &audio_format, gcc_unused Error &error)
VolumeFilter::Open(AudioFormat &audio_format, Error &error)
{
format = audio_format;
if (!pv.Open(audio_format.format, error))
return AudioFormat::Undefined();
return format;
return audio_format;
}
void
VolumeFilter::Close()
{
buffer.Clear();
pv.Close();
}
const void *
VolumeFilter::FilterPCM(const void *src, size_t src_size,
size_t *dest_size_r, Error &error)
size_t *dest_size_r, gcc_unused Error &error)
{
*dest_size_r = src_size;
if (volume >= PCM_VOLUME_1)
/* optimized special case: 100% volume = no-op */
return src;
void *dest = buffer.Get(src_size);
if (volume <= 0) {
/* optimized special case: 0% volume = memset(0) */
/* XXX is this valid for all sample formats? What
about floating point? */
memset(dest, 0, src_size);
return dest;
}
memcpy(dest, src, src_size);
bool success = pcm_volume(dest, src_size,
format.format,
volume);
if (!success) {
error.Set(volume_domain, "pcm_volume() has failed");
return NULL;
}
return dest;
const auto dest = pv.Apply({src, src_size});
*dest_size_r = dest.size;
return dest.data;
}
const struct filter_plugin volume_filter_plugin = {

119
src/pcm/Volume.cxx
View File

@@ -19,9 +19,11 @@
#include "config.h"
#include "Volume.hxx"
#include "Domain.hxx"
#include "PcmUtils.hxx"
#include "Traits.hxx"
#include "AudioFormat.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include <stdint.h>
#include <string.h>
@@ -143,61 +145,88 @@ pcm_volume_change_float(float *dest, const float *src, const float *end,
}
bool
pcm_volume(void *buffer, size_t length,
SampleFormat format,
int volume)
PcmVolume::Open(SampleFormat _format, Error &error)
{
if (volume == PCM_VOLUME_1S)
return true;
assert(format == SampleFormat::UNDEFINED);
if (volume <= 0) {
memset(buffer, 0, length);
return true;
}
const void *end = pcm_end_pointer(buffer, length);
switch (format) {
switch (_format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
/* not implemented */
error.Format(pcm_domain,
"Software volume for %s is not implemented",
sample_format_to_string(_format));
return false;
case SampleFormat::S8:
pcm_volume_change_8((int8_t *)buffer,
(const int8_t *)buffer,
(const int8_t *)end,
volume);
return true;
case SampleFormat::S16:
pcm_volume_change_16((int16_t *)buffer,
(const int16_t *)buffer,
(const int16_t *)end,
volume);
return true;
case SampleFormat::S24_P32:
pcm_volume_change_24((int32_t *)buffer,
(const int32_t *)buffer,
(const int32_t *)end,
volume);
return true;
case SampleFormat::S32:
pcm_volume_change_32((int32_t *)buffer,
(const int32_t *)buffer,
(const int32_t *)end,
volume);
return true;
case SampleFormat::FLOAT:
pcm_volume_change_float((float *)buffer,
(const float *)buffer,
(const float *)end,
pcm_volume_to_float(volume));
return true;
break;
}
assert(false);
gcc_unreachable();
format = _format;
return true;
}
ConstBuffer<void>
PcmVolume::Apply(ConstBuffer<void> src)
{
if (volume == PCM_VOLUME_1)
return src;
void *data = buffer.Get(src.size);
if (volume == 0) {
/* optimized special case: 0% volume = memset(0) */
/* TODO: is this valid for all sample formats? What
about floating point? */
memset(data, 0, src.size);
return { data, src.size };
}
const void *end = pcm_end_pointer(src.data, src.size);
switch (format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
assert(false);
gcc_unreachable();
case SampleFormat::S8:
pcm_volume_change_8((int8_t *)data,
(const int8_t *)src.data,
(const int8_t *)end,
volume);
break;
case SampleFormat::S16:
pcm_volume_change_16((int16_t *)data,
(const int16_t *)src.data,
(const int16_t *)end,
volume);
break;
case SampleFormat::S24_P32:
pcm_volume_change_24((int32_t *)data,
(const int32_t *)src.data,
(const int32_t *)end,
volume);
break;
case SampleFormat::S32:
pcm_volume_change_32((int32_t *)data,
(const int32_t *)src.data,
(const int32_t *)end,
volume);
break;
case SampleFormat::FLOAT:
pcm_volume_change_float((float *)data,
(const float *)src.data,
(const float *)end,
pcm_volume_to_float(volume));
break;
}
return { data, src.size };
}

79
src/pcm/Volume.hxx
View File

@@ -22,10 +22,18 @@
#include "PcmPrng.hxx"
#include "AudioFormat.hxx"
#include "PcmBuffer.hxx"
#include <stdint.h>
#include <stddef.h>
#ifndef NDEBUG
#include <assert.h>
#endif
class Error;
template<typename T> struct ConstBuffer;
/**
* Number of fractional bits for a fixed-point volume value.
*/
@@ -71,17 +79,66 @@ pcm_volume_dither(void)
}
/**
* Adjust the volume of the specified PCM buffer.
*
* @param buffer the PCM buffer
* @param length the length of the PCM buffer
* @param format the sample format of the PCM buffer
* @param volume the volume between 0 and #PCM_VOLUME_1
* @return true on success, false if the audio format is not supported
* A class that converts samples from one format to another.
*/
bool
pcm_volume(void *buffer, size_t length,
SampleFormat format,
int volume);
class PcmVolume {
SampleFormat format;
unsigned volume;
PcmBuffer buffer;
public:
PcmVolume()
:volume(PCM_VOLUME_1) {
#ifndef NDEBUG
format = SampleFormat::UNDEFINED;
#endif
}
#ifndef NDEBUG
~PcmVolume() {
assert(format == SampleFormat::UNDEFINED);
}
#endif
unsigned GetVolume() const {
return volume;
}
/**
* @param _volume the volume level in the range
* [0..#PCM_VOLUME_1]; may be bigger than #PCM_VOLUME_1, but
* then it will most likely clip a lot
*/
void SetVolume(unsigned _volume) {
volume = _volume;
}
/**
* Opens the object, prepare for Apply().
*
* @param format the sample format
* @param error location to store the error
* @return true on success
*/
bool Open(SampleFormat format, Error &error);
/**
* Closes the object. After that, you may call Open() again.
*/
void Close() {
#ifndef NDEBUG
assert(format != SampleFormat::UNDEFINED);
format = SampleFormat::UNDEFINED;
#endif
}
/**
* Apply the volume level.
*/
gcc_pure
ConstBuffer<void> Apply(ConstBuffer<void> src);
};
#endif