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pcm/Silence: use std::span

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This commit is contained in:
Max Kellermann
2022-05-20 10:09:50 +02:00
parent 3bb7693200
commit 84e5da4bf0
7 changed files with 14 additions and 18 deletions
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3
src/pcm/Export.cxx
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@@ -23,7 +23,6 @@
#include "Silence.hxx"
#include "util/ByteReverse.hxx"
#include "util/ConstBuffer.hxx"
#include "util/WritableBuffer.hxx"
#include <cassert>
@@ -94,7 +93,7 @@ PcmExport::Open(SampleFormat sample_format, unsigned _channels,
}
/* prepare a moment of silence for GetSilence() */
char buffer[sizeof(silence_buffer)];
std::byte buffer[sizeof(silence_buffer)];
const size_t buffer_size = GetInputBlockSize();
assert(buffer_size < sizeof(buffer));
PcmSilence({buffer, buffer_size}, src_sample_format);

3
src/pcm/PcmChannels.cxx
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@@ -23,7 +23,6 @@
#include "Silence.hxx"
#include "Traits.hxx"
#include "util/ConstBuffer.hxx"
#include "util/WritableBuffer.hxx"
#include <array>
#include <algorithm>
@@ -109,7 +108,7 @@ StereoToN(typename Traits::pointer dest,
assert((end - src) % 2 == 0);
std::array<typename Traits::value_type, MAX_CHANNELS - 2> silence;
PcmSilence({&silence.front(), sizeof(silence)}, F);
PcmSilence(std::as_writable_bytes(std::span{silence}), F);
while (src != end) {
/* copy left/right to front-left/front-right, which is

11
src/pcm/Silence.cxx
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@@ -20,16 +20,15 @@
#include "Silence.hxx"
#include "Traits.hxx"
#include "SampleFormat.hxx"
#include "util/WritableBuffer.hxx"
#include <string.h>
#include <algorithm>
void
PcmSilence(WritableBuffer<void> dest, SampleFormat format) noexcept
PcmSilence(std::span<std::byte> dest, SampleFormat format) noexcept
{
uint8_t pattern = 0;
std::byte pattern{0};
if (format == SampleFormat::DSD)
pattern = SampleTraits<SampleFormat::DSD>::SILENCE;
pattern = std::byte{SampleTraits<SampleFormat::DSD>::SILENCE};
memset(dest.data, pattern, dest.size);
std::fill(dest.begin(), dest.end(), pattern);
}

5
src/pcm/Silence.hxx
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@@ -20,15 +20,16 @@
#ifndef MPD_PCM_SILENCE_HXX
#define MPD_PCM_SILENCE_HXX
#include <cstddef>
#include <cstdint>
#include <span>
template<typename T> struct WritableBuffer;
enum class SampleFormat : uint8_t;
/**
* Fill the given buffer with the format-specific silence pattern.
*/
void
PcmSilence(WritableBuffer<void> dest, SampleFormat format) noexcept;
PcmSilence(std::span<std::byte> dest, SampleFormat format) noexcept;
#endif

4
src/pcm/Volume.cxx
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@@ -21,7 +21,6 @@
#include "Silence.hxx"
#include "Traits.hxx"
#include "util/ConstBuffer.hxx"
#include "util/WritableBuffer.hxx"
#include "util/RuntimeError.hxx"
#include "util/TransformN.hxx"
@@ -204,7 +203,8 @@ PcmVolume::Apply(ConstBuffer<void> src) noexcept
if (volume == 0) {
/* optimized special case: 0% volume = memset(0) */
PcmSilence({data, dest_size}, format);
PcmSilence(std::span{(std::byte *)data, dest_size},
format);
return { data, dest_size };
}