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author | Andrée Ekroth <andree.ekroth@gmail.com> | 2014-01-12 21:40:29 +0100 |
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committer | Max Kellermann <max@duempel.org> | 2014-01-13 11:14:19 +0100 |
commit | ea771c17c55395b34d8ee3f8073a89d401c85835 (patch) | |
tree | 3ee0dc6192b403baa7a1a4a03d7bc8b72221a60b /src/encoder/ShineEncoderPlugin.cxx | |
parent | 65ebfb16c90f7c0921983009775b1a2414371d94 (diff) | |
download | mpd-ea771c17c55395b34d8ee3f8073a89d401c85835.tar.gz mpd-ea771c17c55395b34d8ee3f8073a89d401c85835.tar.xz mpd-ea771c17c55395b34d8ee3f8073a89d401c85835.zip |
Shine encoding plugin
This encoding plugin features a fixed-point mp3 encoder,
with faster encoding on architectures without a FPU.
Right now the encoder is limited to stereo and 16 bit depth.
The bitrate and sample rate can be modified in audio_output.
audio_output {
type "httpd"
name "My shine stream"
encoder "shine"
port "8000"
format "44100:16:2"
bitrate "320" # default: 128
}
Diffstat (limited to '')
-rw-r--r-- | src/encoder/ShineEncoderPlugin.cxx | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/src/encoder/ShineEncoderPlugin.cxx b/src/encoder/ShineEncoderPlugin.cxx new file mode 100644 index 000000000..009ffd1b9 --- /dev/null +++ b/src/encoder/ShineEncoderPlugin.cxx @@ -0,0 +1,257 @@ +/* + * Copyright (C) 2003-2014 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 "config.h" +#include "EncoderAPI.hxx" +#include "AudioFormat.hxx" +#include "ConfigError.hxx" +#include "util/Manual.hxx" +#include "util/NumberParser.hxx" +#include "util/DynamicFifoBuffer.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" + +extern "C" +{ +#include <shine/layer3.h> +} + +static constexpr size_t BUFFER_INIT_SIZE = 8192; +static constexpr unsigned CHANNELS = 2; + +struct ShineEncoder { + Encoder encoder; + + AudioFormat audio_format; + + shine_t shine; + + shine_config_t config; + + uint16_t frame_size; + int16_t buffer[SHINE_MAX_SAMPLES * CHANNELS]; + int16_t channels[CHANNELS][SHINE_MAX_SAMPLES]; + int16_t *stereo[CHANNELS]; + + Manual<DynamicFifoBuffer<int16_t>> input_buffer; + size_t input_size; + + Manual<DynamicFifoBuffer<uint8_t>> output_buffer; + + ShineEncoder() + :encoder(shine_encoder_plugin), + stereo { channels[0], channels[1] }, + input_size(0) {} + + bool Configure(const config_param ¶m, Error &error); + + bool Setup(Error &error); + + bool WriteChunks(bool flush, Error &error); +}; + +static constexpr Domain shine_encoder_domain("shine_encoder"); + +inline bool +ShineEncoder::Configure(const config_param ¶m, + gcc_unused Error &error) +{ + shine_set_config_mpeg_defaults(&config.mpeg); + config.mpeg.bitr = param.GetBlockValue("bitrate", 128); + + return true; +} + +static Encoder * +shine_encoder_init(const config_param ¶m, Error &error) +{ + ShineEncoder *encoder = new ShineEncoder(); + + /* load configuration from "param" */ + if (!encoder->Configure(param, error)) { + /* configuration has failed, roll back and return error */ + delete encoder; + return nullptr; + } + + return &encoder->encoder; +} + +static void +shine_encoder_finish(Encoder *_encoder) +{ + ShineEncoder *encoder = (ShineEncoder *)_encoder; + + delete encoder; +} + +inline bool +ShineEncoder::Setup(Error &error) +{ + input_size = 0; + 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) { + error.Format(config_domain, + "error configuring shine. samplerate %d and bitrate %d configuration not supported.", + config.wave.samplerate, + config.mpeg.bitr); + + return false; + } + + shine = shine_initialise(&config); + + if (!shine) { + error.Format(config_domain, + "error initializing shine."); + + return false; + } + + frame_size = shine_samples_per_pass(shine); + + return true; +} + +static bool +shine_encoder_open(Encoder *_encoder, AudioFormat &audio_format, Error &error) +{ + ShineEncoder *encoder = (ShineEncoder *)_encoder; + + audio_format.format = SampleFormat::S16; + audio_format.channels = CHANNELS; + encoder->audio_format = audio_format; + + if (!encoder->Setup(error)) + return false; + + encoder->input_buffer.Construct(BUFFER_INIT_SIZE); + encoder->output_buffer.Construct(BUFFER_INIT_SIZE); + + return true; +} + +static void +shine_encoder_close(Encoder *_encoder) +{ + ShineEncoder *encoder = (ShineEncoder *)_encoder; + + shine_close(encoder->shine); + encoder->input_buffer.Destruct(); + encoder->output_buffer.Destruct(); +} + +bool +ShineEncoder::WriteChunks(bool flush, gcc_unused Error &error) +{ + const size_t chunk_size = frame_size * audio_format.channels; + + /* + * shine requires data in specific sizes, therefore we need to + * buffer the received data and encode in chunks. + */ + while (input_size >= chunk_size || (flush && input_size > 0)) { + long written; + + const size_t read = input_buffer->Read(buffer, chunk_size); + input_size -= read; + + /* de-interleave data */ + for (size_t i = 0; i < read / audio_format.channels; i++) { + channels[0][i] = buffer[i * audio_format.channels]; + channels[1][i] = buffer[i * audio_format.channels + 1]; + } + + if (flush) { + /* fill remaining with 0s */ + for (size_t i = read / audio_format.channels; i < frame_size; i++) { + channels[0][i] = channels[1][i] = 0; + } + } + + const uint8_t *out = shine_encode_buffer(shine, stereo, &written); + + if (written > 0) + output_buffer->Append((const uint8_t *)out, written); + } + + return true; +} + +static bool +shine_encoder_write(Encoder *_encoder, + const void *_data, size_t length, + gcc_unused Error &error) +{ + ShineEncoder *encoder = (ShineEncoder *)_encoder; + const int16_t *data = (const int16_t*)_data; + + encoder->input_buffer->Append(data, length / sizeof(*data)); + encoder->input_size += length / sizeof(*data); + + return encoder->WriteChunks(false, error); +} + +static bool +shine_encoder_flush(Encoder *_encoder, gcc_unused Error &error) +{ + ShineEncoder *encoder = (ShineEncoder *)_encoder; + long written; + + encoder->WriteChunks(true, error); + const uint8_t *data = shine_flush(encoder->shine, &written); + + if (written > 0) + encoder->output_buffer->Append(data, written); + + return true; +} + +static size_t +shine_encoder_read(Encoder *_encoder, void *dest, size_t length) +{ + ShineEncoder *encoder = (ShineEncoder *)_encoder; + + return encoder->output_buffer->Read((uint8_t *)dest, length); +} + +static const char * +shine_encoder_get_mime_type(gcc_unused Encoder *_encoder) +{ + return "audio/mpeg"; +} + +const EncoderPlugin shine_encoder_plugin = { + "shine", + shine_encoder_init, + shine_encoder_finish, + shine_encoder_open, + shine_encoder_close, + shine_encoder_flush, + shine_encoder_flush, + nullptr, + nullptr, + shine_encoder_write, + shine_encoder_read, + shine_encoder_get_mime_type, +}; |