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-rw-r--r--src/encoder/plugins/OpusEncoderPlugin.cxx419
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diff --git a/src/encoder/plugins/OpusEncoderPlugin.cxx b/src/encoder/plugins/OpusEncoderPlugin.cxx
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+++ b/src/encoder/plugins/OpusEncoderPlugin.cxx
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+/*
+ * 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 &param, 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 &param, 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 nullptr;
+ }
+
+ 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,
+};