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Diffstat (limited to 'src/encoder/plugins/OpusEncoderPlugin.cxx')
-rw-r--r-- | src/encoder/plugins/OpusEncoderPlugin.cxx | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/src/encoder/plugins/OpusEncoderPlugin.cxx b/src/encoder/plugins/OpusEncoderPlugin.cxx new file mode 100644 index 000000000..5cb65e4f2 --- /dev/null +++ b/src/encoder/plugins/OpusEncoderPlugin.cxx @@ -0,0 +1,419 @@ +/* + * 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 "config.h" +#include "OpusEncoderPlugin.hxx" +#include "OggStream.hxx" +#include "OggSerial.hxx" +#include "../EncoderAPI.hxx" +#include "AudioFormat.hxx" +#include "config/ConfigError.hxx" +#include "util/Alloc.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "system/ByteOrder.hxx" + +#include <opus.h> +#include <ogg/ogg.h> + +#include <assert.h> +#include <stdlib.h> + +struct opus_encoder { + /** the base class */ + Encoder encoder; + + /* configuration */ + + opus_int32 bitrate; + int complexity; + int signal; + + /* runtime information */ + + AudioFormat audio_format; + + size_t frame_size; + + size_t buffer_frames, buffer_size, buffer_position; + uint8_t *buffer; + + OpusEncoder *enc; + + unsigned char buffer2[1275 * 3 + 7]; + + OggStream stream; + + int lookahead; + + ogg_int64_t packetno; + + ogg_int64_t granulepos; + + opus_encoder():encoder(opus_encoder_plugin) {} +}; + +static constexpr Domain opus_encoder_domain("opus_encoder"); + +static bool +opus_encoder_configure(struct opus_encoder *encoder, + const config_param ¶m, Error &error) +{ + const char *value = param.GetBlockValue("bitrate", "auto"); + if (strcmp(value, "auto") == 0) + encoder->bitrate = OPUS_AUTO; + else if (strcmp(value, "max") == 0) + encoder->bitrate = OPUS_BITRATE_MAX; + else { + char *endptr; + encoder->bitrate = strtoul(value, &endptr, 10); + if (endptr == value || *endptr != 0 || + encoder->bitrate < 500 || encoder->bitrate > 512000) { + error.Set(config_domain, "Invalid bit rate"); + return false; + } + } + + encoder->complexity = param.GetBlockValue("complexity", 10u); + if (encoder->complexity > 10) { + error.Format(config_domain, "Invalid complexity"); + return false; + } + + value = param.GetBlockValue("signal", "auto"); + if (strcmp(value, "auto") == 0) + encoder->signal = OPUS_AUTO; + else if (strcmp(value, "voice") == 0) + encoder->signal = OPUS_SIGNAL_VOICE; + else if (strcmp(value, "music") == 0) + encoder->signal = OPUS_SIGNAL_MUSIC; + else { + error.Format(config_domain, "Invalid signal"); + return false; + } + + return true; +} + +static Encoder * +opus_encoder_init(const config_param ¶m, Error &error) +{ + opus_encoder *encoder = new opus_encoder(); + + /* load configuration from "param" */ + if (!opus_encoder_configure(encoder, param, error)) { + /* configuration has failed, roll back and return error */ + delete encoder; + return NULL; + } + + return &encoder->encoder; +} + +static void +opus_encoder_finish(Encoder *_encoder) +{ + struct opus_encoder *encoder = (struct opus_encoder *)_encoder; + + /* the real libopus cleanup was already performed by + opus_encoder_close(), so no real work here */ + delete encoder; +} + +static bool +opus_encoder_open(Encoder *_encoder, + AudioFormat &audio_format, + Error &error) +{ + struct opus_encoder *encoder = (struct opus_encoder *)_encoder; + + /* libopus supports only 48 kHz */ + audio_format.sample_rate = 48000; + + if (audio_format.channels > 2) + audio_format.channels = 1; + + switch (audio_format.format) { + case SampleFormat::S16: + case SampleFormat::FLOAT: + break; + + case SampleFormat::S8: + audio_format.format = SampleFormat::S16; + break; + + default: + audio_format.format = SampleFormat::FLOAT; + break; + } + + encoder->audio_format = audio_format; + encoder->frame_size = audio_format.GetFrameSize(); + + int error_code; + encoder->enc = opus_encoder_create(audio_format.sample_rate, + audio_format.channels, + OPUS_APPLICATION_AUDIO, + &error_code); + if (encoder->enc == nullptr) { + error.Set(opus_encoder_domain, error_code, + opus_strerror(error_code)); + return false; + } + + opus_encoder_ctl(encoder->enc, OPUS_SET_BITRATE(encoder->bitrate)); + opus_encoder_ctl(encoder->enc, + OPUS_SET_COMPLEXITY(encoder->complexity)); + opus_encoder_ctl(encoder->enc, OPUS_SET_SIGNAL(encoder->signal)); + + opus_encoder_ctl(encoder->enc, OPUS_GET_LOOKAHEAD(&encoder->lookahead)); + + encoder->buffer_frames = audio_format.sample_rate / 50; + encoder->buffer_size = encoder->frame_size * encoder->buffer_frames; + encoder->buffer_position = 0; + encoder->buffer = (unsigned char *)xalloc(encoder->buffer_size); + + encoder->stream.Initialize(GenerateOggSerial()); + encoder->packetno = 0; + + return true; +} + +static void +opus_encoder_close(Encoder *_encoder) +{ + struct opus_encoder *encoder = (struct opus_encoder *)_encoder; + + encoder->stream.Deinitialize(); + free(encoder->buffer); + opus_encoder_destroy(encoder->enc); +} + +static bool +opus_encoder_do_encode(struct opus_encoder *encoder, bool eos, + Error &error) +{ + assert(encoder->buffer_position == encoder->buffer_size); + + opus_int32 result = + encoder->audio_format.format == SampleFormat::S16 + ? opus_encode(encoder->enc, + (const opus_int16 *)encoder->buffer, + encoder->buffer_frames, + encoder->buffer2, + sizeof(encoder->buffer2)) + : opus_encode_float(encoder->enc, + (const float *)encoder->buffer, + encoder->buffer_frames, + encoder->buffer2, + sizeof(encoder->buffer2)); + if (result < 0) { + error.Set(opus_encoder_domain, "Opus encoder error"); + return false; + } + + encoder->granulepos += encoder->buffer_frames; + + ogg_packet packet; + packet.packet = encoder->buffer2; + packet.bytes = result; + packet.b_o_s = false; + packet.e_o_s = eos; + packet.granulepos = encoder->granulepos; + packet.packetno = encoder->packetno++; + encoder->stream.PacketIn(packet); + + encoder->buffer_position = 0; + + return true; +} + +static bool +opus_encoder_end(Encoder *_encoder, Error &error) +{ + struct opus_encoder *encoder = (struct opus_encoder *)_encoder; + + encoder->stream.Flush(); + + memset(encoder->buffer + encoder->buffer_position, 0, + encoder->buffer_size - encoder->buffer_position); + encoder->buffer_position = encoder->buffer_size; + + return opus_encoder_do_encode(encoder, true, error); +} + +static bool +opus_encoder_flush(Encoder *_encoder, gcc_unused Error &error) +{ + struct opus_encoder *encoder = (struct opus_encoder *)_encoder; + + encoder->stream.Flush(); + return true; +} + +static bool +opus_encoder_write_silence(struct opus_encoder *encoder, unsigned fill_frames, + Error &error) +{ + size_t fill_bytes = fill_frames * encoder->frame_size; + + while (fill_bytes > 0) { + size_t nbytes = + encoder->buffer_size - encoder->buffer_position; + if (nbytes > fill_bytes) + nbytes = fill_bytes; + + memset(encoder->buffer + encoder->buffer_position, + 0, nbytes); + encoder->buffer_position += nbytes; + fill_bytes -= nbytes; + + if (encoder->buffer_position == encoder->buffer_size && + !opus_encoder_do_encode(encoder, false, error)) + return false; + } + + return true; +} + +static bool +opus_encoder_write(Encoder *_encoder, + const void *_data, size_t length, + Error &error) +{ + struct opus_encoder *encoder = (struct opus_encoder *)_encoder; + const uint8_t *data = (const uint8_t *)_data; + + if (encoder->lookahead > 0) { + /* generate some silence at the beginning of the + stream */ + + assert(encoder->buffer_position == 0); + + if (!opus_encoder_write_silence(encoder, encoder->lookahead, + error)) + return false; + + encoder->lookahead = 0; + } + + while (length > 0) { + size_t nbytes = + encoder->buffer_size - encoder->buffer_position; + if (nbytes > length) + nbytes = length; + + memcpy(encoder->buffer + encoder->buffer_position, + data, nbytes); + data += nbytes; + length -= nbytes; + encoder->buffer_position += nbytes; + + if (encoder->buffer_position == encoder->buffer_size && + !opus_encoder_do_encode(encoder, false, error)) + return false; + } + + return true; +} + +static void +opus_encoder_generate_head(struct opus_encoder *encoder) +{ + unsigned char header[19]; + memcpy(header, "OpusHead", 8); + header[8] = 1; + header[9] = encoder->audio_format.channels; + *(uint16_t *)(header + 10) = ToLE16(encoder->lookahead); + *(uint32_t *)(header + 12) = + ToLE32(encoder->audio_format.sample_rate); + header[16] = 0; + header[17] = 0; + header[18] = 0; + + ogg_packet packet; + packet.packet = header; + packet.bytes = 19; + packet.b_o_s = true; + packet.e_o_s = false; + packet.granulepos = 0; + packet.packetno = encoder->packetno++; + encoder->stream.PacketIn(packet); + encoder->stream.Flush(); +} + +static void +opus_encoder_generate_tags(struct opus_encoder *encoder) +{ + const char *version = opus_get_version_string(); + size_t version_length = strlen(version); + + size_t comments_size = 8 + 4 + version_length + 4; + unsigned char *comments = (unsigned char *)xalloc(comments_size); + memcpy(comments, "OpusTags", 8); + *(uint32_t *)(comments + 8) = ToLE32(version_length); + memcpy(comments + 12, version, version_length); + *(uint32_t *)(comments + 12 + version_length) = ToLE32(0); + + ogg_packet packet; + packet.packet = comments; + packet.bytes = comments_size; + packet.b_o_s = false; + packet.e_o_s = false; + packet.granulepos = 0; + packet.packetno = encoder->packetno++; + encoder->stream.PacketIn(packet); + encoder->stream.Flush(); + + free(comments); +} + +static size_t +opus_encoder_read(Encoder *_encoder, void *dest, size_t length) +{ + struct opus_encoder *encoder = (struct opus_encoder *)_encoder; + + if (encoder->packetno == 0) + opus_encoder_generate_head(encoder); + else if (encoder->packetno == 1) + opus_encoder_generate_tags(encoder); + + return encoder->stream.PageOut(dest, length); +} + +static const char * +opus_encoder_get_mime_type(gcc_unused Encoder *_encoder) +{ + return "audio/ogg"; +} + +const EncoderPlugin opus_encoder_plugin = { + "opus", + opus_encoder_init, + opus_encoder_finish, + opus_encoder_open, + opus_encoder_close, + opus_encoder_end, + opus_encoder_flush, + nullptr, + nullptr, + opus_encoder_write, + opus_encoder_read, + opus_encoder_get_mime_type, +}; |