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PcmDsdUsb: use class ConstBuffer

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This commit is contained in:
Max Kellermann 2014-08-12 21:38:36 +02:00
parent 0e756e4377
commit 069895d26b
3 changed files with 16 additions and 18 deletions
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22
src/pcm/PcmDsdUsb.cxx
View File

@ -21,6 +21,7 @@
#include "PcmDsdUsb.hxx"
#include "PcmBuffer.hxx"
#include "AudioFormat.hxx"
#include "util/ConstBuffer.hxx"
#include <assert.h>
@ -38,18 +39,16 @@ pcm_two_dsd_to_usb_marker2(uint8_t a, uint8_t b)
return 0xfffa0000 | (a << 8) | b;
}
const uint32_t *
ConstBuffer<uint32_t>
pcm_dsd_to_usb(PcmBuffer &buffer, unsigned channels,
const uint8_t *src, size_t src_size,
size_t *dest_size_r)
ConstBuffer<uint8_t> _src)
{
assert(audio_valid_channel_count(channels));
assert(src != nullptr);
assert(src_size > 0);
assert(src_size % channels == 0);
assert(!_src.IsNull());
assert(_src.size > 0);
assert(_src.size % channels == 0);
const unsigned num_src_samples = src_size;
const unsigned num_src_samples = _src.size;
const unsigned num_src_frames = num_src_samples / channels;
/* this rounds down and discards the last odd frame; not
@ -57,11 +56,10 @@ pcm_dsd_to_usb(PcmBuffer &buffer, unsigned channels,
const unsigned num_frames = num_src_frames / 2;
const unsigned num_samples = num_frames * channels;
const size_t dest_size = num_samples * 4;
*dest_size_r = dest_size;
uint32_t *const dest0 = (uint32_t *)buffer.Get(dest_size),
uint32_t *const dest0 = (uint32_t *)buffer.GetT<uint32_t>(num_samples),
*dest = dest0;
auto src = _src.data;
for (unsigned i = num_frames / 2; i > 0; --i) {
for (unsigned c = channels; c > 0; --c) {
/* each 24 bit sample has 16 DSD sample bits
@ -94,5 +92,5 @@ pcm_dsd_to_usb(PcmBuffer &buffer, unsigned channels,
src += channels;
}
return dest0;
return { dest0, num_samples };
}

6
src/pcm/PcmDsdUsb.hxx
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@ -26,6 +26,7 @@
#include <stddef.h>
class PcmBuffer;
template<typename T> struct ConstBuffer;
/**
* Pack DSD 1 bit samples into (padded) 24 bit PCM samples for
@ -33,9 +34,8 @@ class PcmBuffer;
* dCS and others:
* http://www.sonore.us/DoP_openStandard_1v1.pdf
*/
const uint32_t *
ConstBuffer<uint32_t>
pcm_dsd_to_usb(PcmBuffer &buffer, unsigned channels,
const uint8_t *src, size_t src_size,
size_t *dest_size_r);
ConstBuffer<uint8_t> src);
#endif

6
src/pcm/PcmExport.cxx
View File

@ -76,9 +76,9 @@ ConstBuffer<void>
PcmExport::Export(ConstBuffer<void> data)
{
if (dsd_usb)
data.data = pcm_dsd_to_usb(dsd_buffer, channels,
(const uint8_t *)data.data,
data.size, &data.size);
data = pcm_dsd_to_usb(dsd_buffer, channels,
ConstBuffer<uint8_t>::FromVoid(data))
.ToVoid();
if (pack24) {
const auto src = ConstBuffer<int32_t>::FromVoid(data);