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/*
* Copyright 2003-2020 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "WaveEncoderPlugin.hxx"
#include "../EncoderAPI.hxx"
#include "util/ByteOrder.hxx"
#include "util/DynamicFifoBuffer.hxx"
#include <assert.h>
#include <string.h>
static constexpr uint16_t WAVE_FORMAT_PCM = 1;
class WaveEncoder final : public Encoder {
unsigned bits;
DynamicFifoBuffer<uint8_t> buffer;
public:
explicit WaveEncoder(AudioFormat &audio_format) noexcept;
/* virtual methods from class Encoder */
void Write(const void *data, size_t length) override;
size_t Read(void *dest, size_t length) noexcept override {
return buffer.Read((uint8_t *)dest, length);
}
};
class PreparedWaveEncoder final : public PreparedEncoder {
/* virtual methods from class PreparedEncoder */
Encoder *Open(AudioFormat &audio_format) override {
return new WaveEncoder(audio_format);
}
const char *GetMimeType() const noexcept override {
return "audio/wav";
}
};
struct WaveHeader {
uint32_t id_riff;
uint32_t riff_size;
uint32_t id_wave;
uint32_t id_fmt;
uint32_t fmt_size;
uint16_t format;
uint16_t channels;
uint32_t freq;
uint32_t byterate;
uint16_t blocksize;
uint16_t bits;
uint32_t id_data;
uint32_t data_size;
};
static void
fill_wave_header(WaveHeader *header, int channels, int bits,
int freq, int block_size) noexcept
{
int data_size = 0x0FFFFFFF;
/* constants */
header->id_riff = ToLE32(0x46464952);
header->id_wave = ToLE32(0x45564157);
header->id_fmt = ToLE32(0x20746d66);
header->id_data = ToLE32(0x61746164);
/* wave format */
header->format = ToLE16(WAVE_FORMAT_PCM);
header->channels = ToLE16(channels);
header->bits = ToLE16(bits);
header->freq = ToLE32(freq);
header->blocksize = ToLE16(block_size);
header->byterate = ToLE32(freq * block_size);
/* chunk sizes (fake data length) */
header->fmt_size = ToLE32(16);
header->data_size = ToLE32(data_size);
header->riff_size = ToLE32(4 + (8 + 16) + (8 + data_size));
}
static PreparedEncoder *
wave_encoder_init(gcc_unused const ConfigBlock &block)
{
return new PreparedWaveEncoder();
}
WaveEncoder::WaveEncoder(AudioFormat &audio_format) noexcept
:Encoder(false),
buffer(8192)
{
assert(audio_format.IsValid());
switch (audio_format.format) {
case SampleFormat::S8:
bits = 8;
break;
case SampleFormat::S16:
bits = 16;
break;
case SampleFormat::S24_P32:
bits = 24;
break;
case SampleFormat::S32:
bits = 32;
break;
default:
audio_format.format = SampleFormat::S16;
bits = 16;
break;
}
auto range = buffer.Write();
assert(range.size >= sizeof(WaveHeader));
auto *header = (WaveHeader *)range.data;
/* create PCM wave header in initial buffer */
fill_wave_header(header,
audio_format.channels,
bits,
audio_format.sample_rate,
(bits / 8) * audio_format.channels);
buffer.Append(sizeof(*header));
}
static size_t
pcm16_to_wave(uint16_t *dst16, const uint16_t *src16, size_t length)
{
size_t cnt = length >> 1;
while (cnt > 0) {
*dst16++ = ToLE16(*src16++);
cnt--;
}
return length;
}
static size_t
pcm32_to_wave(uint32_t *dst32, const uint32_t *src32, size_t length) noexcept
{
size_t cnt = length >> 2;
while (cnt > 0){
*dst32++ = ToLE32(*src32++);
cnt--;
}
return length;
}
static size_t
pcm24_to_wave(uint8_t *dst8, const uint32_t *src32, size_t length) noexcept
{
uint32_t value;
uint8_t *dst_old = dst8;
length = length >> 2;
while (length > 0){
value = *src32++;
*dst8++ = (value) & 0xFF;
*dst8++ = (value >> 8) & 0xFF;
*dst8++ = (value >> 16) & 0xFF;
length--;
}
//correct buffer length
return (dst8 - dst_old);
}
void
WaveEncoder::Write(const void *src, size_t length)
{
uint8_t *dst = buffer.Write(length);
if (IsLittleEndian()) {
switch (bits) {
case 8:
case 16:
case 32:// optimized cases
memcpy(dst, src, length);
break;
case 24:
length = pcm24_to_wave(dst, (const uint32_t *)src, length);
break;
}
} else {
switch (bits) {
case 8:
memcpy(dst, src, length);
break;
case 16:
length = pcm16_to_wave((uint16_t *)dst,
(const uint16_t *)src, length);
break;
case 24:
length = pcm24_to_wave(dst, (const uint32_t *)src, length);
break;
case 32:
length = pcm32_to_wave((uint32_t *)dst,
(const uint32_t *)src, length);
break;
}
}
buffer.Append(length);
}
const EncoderPlugin wave_encoder_plugin = {
"wave",
wave_encoder_init,
};
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