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/*
* Copyright 2003-2021 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 "ShineEncoderPlugin.hxx"
#include "../EncoderAPI.hxx"
#include "pcm/AudioFormat.hxx"
#include "util/DynamicFifoBuffer.hxx"
#include "util/RuntimeError.hxx"
extern "C"
{
#include <shine/layer3.h>
}
static constexpr size_t BUFFER_INIT_SIZE = 8192;
static constexpr unsigned CHANNELS = 2;
class ShineEncoder final : public Encoder {
const AudioFormat audio_format;
const shine_t shine;
const size_t frame_size;
/* workaround for bug:
https://github.com/savonet/shine/issues/11 */
size_t input_pos = SHINE_MAX_SAMPLES + 1;
int16_t *stereo[CHANNELS];
DynamicFifoBuffer<uint8_t> output_buffer;
public:
ShineEncoder(AudioFormat _audio_format, shine_t _shine) noexcept
:Encoder(false),
audio_format(_audio_format), shine(_shine),
frame_size(shine_samples_per_pass(shine)),
stereo{new int16_t[frame_size], new int16_t[frame_size]},
output_buffer(BUFFER_INIT_SIZE) {}
~ShineEncoder() noexcept override {
if (input_pos > SHINE_MAX_SAMPLES) {
/* write zero chunk */
input_pos = 0;
WriteChunk(true);
}
shine_close(shine);
delete[] stereo[0];
delete[] stereo[1];
}
bool WriteChunk(bool flush);
/* virtual methods from class Encoder */
void End() override {
return Flush();
}
void Flush() override;
void Write(const void *data, size_t length) override;
size_t Read(void *dest, size_t length) noexcept override {
return output_buffer.Read((uint8_t *)dest, length);
}
};
class PreparedShineEncoder final : public PreparedEncoder {
shine_config_t config;
public:
explicit PreparedShineEncoder(const ConfigBlock &block);
/* virtual methods from class PreparedEncoder */
Encoder *Open(AudioFormat &audio_format) override;
[[nodiscard]] const char *GetMimeType() const noexcept override {
return "audio/mpeg";
}
};
PreparedShineEncoder::PreparedShineEncoder(const ConfigBlock &block)
{
shine_set_config_mpeg_defaults(&config.mpeg);
config.mpeg.bitr = block.GetBlockValue("bitrate", 128);
}
static PreparedEncoder *
shine_encoder_init(const ConfigBlock &block)
{
return new PreparedShineEncoder(block);
}
static shine_t
SetupShine(shine_config_t config, AudioFormat &audio_format)
{
audio_format.format = SampleFormat::S16;
audio_format.channels = CHANNELS;
config.mpeg.mode = audio_format.channels == 2 ? STEREO : MONO;
config.wave.samplerate = audio_format.sample_rate;
config.wave.channels =
audio_format.channels == 2 ? PCM_STEREO : PCM_MONO;
if (shine_check_config(config.wave.samplerate, config.mpeg.bitr) < 0)
throw FormatRuntimeError("error configuring shine. "
"samplerate %d and bitrate %d configuration"
" not supported.",
config.wave.samplerate,
config.mpeg.bitr);
auto shine = shine_initialise(&config);
if (!shine)
throw std::runtime_error("error initializing shine");
return shine;
}
Encoder *
PreparedShineEncoder::Open(AudioFormat &audio_format)
{
auto shine = SetupShine(config, audio_format);
return new ShineEncoder(audio_format, shine);
}
bool
ShineEncoder::WriteChunk(bool flush)
{
if (flush || input_pos == frame_size) {
if (flush) {
/* fill remaining with 0s */
for (; input_pos < frame_size; input_pos++) {
stereo[0][input_pos] = stereo[1][input_pos] = 0;
}
}
int written;
const uint8_t *out =
shine_encode_buffer(shine, stereo, &written);
if (written > 0)
output_buffer.Append(out, written);
input_pos = 0;
}
return true;
}
void
ShineEncoder::Write(const void *_data, size_t length)
{
const auto *data = (const int16_t*)_data;
length /= sizeof(*data) * audio_format.channels;
size_t written = 0;
if (input_pos > SHINE_MAX_SAMPLES)
input_pos = 0;
/* write all data to de-interleaved buffers */
while (written < length) {
for (;
written < length && input_pos < frame_size;
written++, input_pos++) {
const size_t base =
written * audio_format.channels;
stereo[0][input_pos] = data[base];
stereo[1][input_pos] = data[base + 1];
}
/* write if chunk is filled */
WriteChunk(false);
}
}
void
ShineEncoder::Flush()
{
/* flush buffers and flush shine */
WriteChunk(true);
int written;
const uint8_t *data = shine_flush(shine, &written);
if (written > 0)
output_buffer.Append(data, written);
}
const EncoderPlugin shine_encoder_plugin = {
"shine",
shine_encoder_init,
};
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