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pcm/Dsd{16,32}: stash odd frames away for the next call

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Similar to commit 32380d1db0, these are
the final parts for really fixing
https://github.com/MusicPlayerDaemon/MPD/issues/469
This commit is contained in:
Max Kellermann
2019-06-18 11:19:27 +02:00
parent 0cc94fe30c
commit bf26adf555
5 changed files with 66 additions and 21 deletions
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18
src/pcm/Dsd16.cxx
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@@ -20,6 +20,8 @@
#include "Dsd16.hxx"
#include "util/ConstBuffer.hxx"
#include <functional>
/**
* Construct a 16 bit integer from two bytes.
*/
@@ -54,18 +56,14 @@ void
Dsd16Converter::Open(unsigned _channels) noexcept
{
channels = _channels;
rest_buffer.Open(channels);
}
ConstBuffer<uint16_t>
Dsd16Converter::Convert(ConstBuffer<uint8_t> _src) noexcept
Dsd16Converter::Convert(ConstBuffer<uint8_t> src) noexcept
{
const size_t in_frames = _src.size / channels;
const size_t out_frames = in_frames / 2;
const size_t out_samples = out_frames * channels;
const uint8_t *src = _src.data;
const auto dest = buffer.GetT<uint16_t>(out_samples);
Dsd8To16(dest, src, out_frames, channels);
return {dest, out_samples};
using namespace std::placeholders;
return rest_buffer.Process<uint16_t>(buffer, src, channels,
std::bind(Dsd8To16, _1, _2, _3, channels));
}

4
src/pcm/Dsd16.hxx
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@@ -21,6 +21,7 @@
#define MPD_PCM_DSD_16_HXX
#include "Buffer.hxx"
#include "RestBuffer.hxx"
#include <stdint.h>
@@ -34,10 +35,13 @@ class Dsd16Converter {
PcmBuffer buffer;
PcmRestBuffer<uint8_t, 2> rest_buffer;
public:
void Open(unsigned _channels) noexcept;
void Reset() noexcept {
rest_buffer.Reset();
}
ConstBuffer<uint16_t> Convert(ConstBuffer<uint8_t> src) noexcept;

19
src/pcm/Dsd32.cxx
View File

@@ -18,9 +18,10 @@
*/
#include "Dsd32.hxx"
#include "Buffer.hxx"
#include "util/ConstBuffer.hxx"
#include <functional>
/**
* Construct a 32 bit integer from four bytes.
*/
@@ -57,18 +58,14 @@ void
Dsd32Converter::Open(unsigned _channels) noexcept
{
channels = _channels;
rest_buffer.Open(channels);
}
ConstBuffer<uint32_t>
Dsd32Converter::Convert(ConstBuffer<uint8_t> _src) noexcept
Dsd32Converter::Convert(ConstBuffer<uint8_t> src) noexcept
{
const size_t in_frames = _src.size / channels;
const size_t out_frames = in_frames / 4;
const size_t out_samples = out_frames * channels;
const uint8_t *src = _src.data;
const auto dest = buffer.GetT<uint32_t>(out_samples);
Dsd8To32(dest, src, out_frames, channels);
return {dest, out_samples};
using namespace std::placeholders;
return rest_buffer.Process<uint32_t>(buffer, src, channels,
std::bind(Dsd8To32, _1, _2, _3, channels));
}

4
src/pcm/Dsd32.hxx
View File

@@ -21,6 +21,7 @@
#define MPD_PCM_DSD_32_HXX
#include "Buffer.hxx"
#include "RestBuffer.hxx"
#include <stdint.h>
@@ -34,10 +35,13 @@ class Dsd32Converter {
PcmBuffer buffer;
PcmRestBuffer<uint8_t, 4> rest_buffer;
public:
void Open(unsigned _channels) noexcept;
void Reset() noexcept {
rest_buffer.Reset();
}
ConstBuffer<uint32_t> Convert(ConstBuffer<uint8_t> src) noexcept;