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-rw-r--r--src/encoder/plugins/TwolameEncoderPlugin.cxx314
1 files changed, 314 insertions, 0 deletions
diff --git a/src/encoder/plugins/TwolameEncoderPlugin.cxx b/src/encoder/plugins/TwolameEncoderPlugin.cxx
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+++ b/src/encoder/plugins/TwolameEncoderPlugin.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 "TwolameEncoderPlugin.hxx"
+#include "../EncoderAPI.hxx"
+#include "AudioFormat.hxx"
+#include "config/ConfigError.hxx"
+#include "util/NumberParser.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#include <twolame.h>
+
+#include <assert.h>
+#include <string.h>
+
+struct TwolameEncoder final {
+ Encoder encoder;
+
+ AudioFormat audio_format;
+ float quality;
+ int bitrate;
+
+ twolame_options *options;
+
+ unsigned char output_buffer[32768];
+ size_t output_buffer_length;
+ size_t output_buffer_position;
+
+ /**
+ * Call libtwolame's flush function when the output_buffer is
+ * empty?
+ */
+ bool flush;
+
+ TwolameEncoder():encoder(twolame_encoder_plugin) {}
+
+ bool Configure(const config_param &param, Error &error);
+};
+
+static constexpr Domain twolame_encoder_domain("twolame_encoder");
+
+bool
+TwolameEncoder::Configure(const config_param &param, Error &error)
+{
+ const char *value;
+ char *endptr;
+
+ value = param.GetBlockValue("quality");
+ if (value != nullptr) {
+ /* a quality was configured (VBR) */
+
+ quality = ParseDouble(value, &endptr);
+
+ if (*endptr != '\0' || quality < -1.0 || quality > 10.0) {
+ error.Format(config_domain,
+ "quality \"%s\" is not a number in the "
+ "range -1 to 10",
+ value);
+ return false;
+ }
+
+ if (param.GetBlockValue("bitrate") != nullptr) {
+ error.Set(config_domain,
+ "quality and bitrate are both defined");
+ return false;
+ }
+ } else {
+ /* a bit rate was configured */
+
+ value = param.GetBlockValue("bitrate");
+ if (value == nullptr) {
+ error.Set(config_domain,
+ "neither bitrate nor quality defined");
+ return false;
+ }
+
+ quality = -2.0;
+ bitrate = ParseInt(value, &endptr);
+
+ if (*endptr != '\0' || bitrate <= 0) {
+ error.Set(config_domain,
+ "bitrate should be a positive integer");
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static Encoder *
+twolame_encoder_init(const config_param &param, Error &error_r)
+{
+ FormatDebug(twolame_encoder_domain,
+ "libtwolame version %s", get_twolame_version());
+
+ TwolameEncoder *encoder = new TwolameEncoder();
+
+ /* load configuration from "param" */
+ if (!encoder->Configure(param, error_r)) {
+ /* configuration has failed, roll back and return error */
+ delete encoder;
+ return nullptr;
+ }
+
+ return &encoder->encoder;
+}
+
+static void
+twolame_encoder_finish(Encoder *_encoder)
+{
+ TwolameEncoder *encoder = (TwolameEncoder *)_encoder;
+
+ /* the real libtwolame cleanup was already performed by
+ twolame_encoder_close(), so no real work here */
+ delete encoder;
+}
+
+static bool
+twolame_encoder_setup(TwolameEncoder *encoder, Error &error)
+{
+ if (encoder->quality >= -1.0) {
+ /* a quality was configured (VBR) */
+
+ if (0 != twolame_set_VBR(encoder->options, true)) {
+ error.Set(twolame_encoder_domain,
+ "error setting twolame VBR mode");
+ return false;
+ }
+ if (0 != twolame_set_VBR_q(encoder->options, encoder->quality)) {
+ error.Set(twolame_encoder_domain,
+ "error setting twolame VBR quality");
+ return false;
+ }
+ } else {
+ /* a bit rate was configured */
+
+ if (0 != twolame_set_brate(encoder->options, encoder->bitrate)) {
+ error.Set(twolame_encoder_domain,
+ "error setting twolame bitrate");
+ return false;
+ }
+ }
+
+ if (0 != twolame_set_num_channels(encoder->options,
+ encoder->audio_format.channels)) {
+ error.Set(twolame_encoder_domain,
+ "error setting twolame num channels");
+ return false;
+ }
+
+ if (0 != twolame_set_in_samplerate(encoder->options,
+ encoder->audio_format.sample_rate)) {
+ error.Set(twolame_encoder_domain,
+ "error setting twolame sample rate");
+ return false;
+ }
+
+ if (0 > twolame_init_params(encoder->options)) {
+ error.Set(twolame_encoder_domain,
+ "error initializing twolame params");
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+twolame_encoder_open(Encoder *_encoder, AudioFormat &audio_format,
+ Error &error)
+{
+ TwolameEncoder *encoder = (TwolameEncoder *)_encoder;
+
+ audio_format.format = SampleFormat::S16;
+ audio_format.channels = 2;
+
+ encoder->audio_format = audio_format;
+
+ encoder->options = twolame_init();
+ if (encoder->options == nullptr) {
+ error.Set(twolame_encoder_domain, "twolame_init() failed");
+ return false;
+ }
+
+ if (!twolame_encoder_setup(encoder, error)) {
+ twolame_close(&encoder->options);
+ return false;
+ }
+
+ encoder->output_buffer_length = 0;
+ encoder->output_buffer_position = 0;
+ encoder->flush = false;
+
+ return true;
+}
+
+static void
+twolame_encoder_close(Encoder *_encoder)
+{
+ TwolameEncoder *encoder = (TwolameEncoder *)_encoder;
+
+ twolame_close(&encoder->options);
+}
+
+static bool
+twolame_encoder_flush(Encoder *_encoder, gcc_unused Error &error)
+{
+ TwolameEncoder *encoder = (TwolameEncoder *)_encoder;
+
+ encoder->flush = true;
+ return true;
+}
+
+static bool
+twolame_encoder_write(Encoder *_encoder,
+ const void *data, size_t length,
+ gcc_unused Error &error)
+{
+ TwolameEncoder *encoder = (TwolameEncoder *)_encoder;
+ const int16_t *src = (const int16_t*)data;
+
+ assert(encoder->output_buffer_position ==
+ encoder->output_buffer_length);
+
+ const unsigned num_frames =
+ length / encoder->audio_format.GetFrameSize();
+
+ int bytes_out = twolame_encode_buffer_interleaved(encoder->options,
+ src, num_frames,
+ encoder->output_buffer,
+ sizeof(encoder->output_buffer));
+ if (bytes_out < 0) {
+ error.Set(twolame_encoder_domain, "twolame encoder failed");
+ return false;
+ }
+
+ encoder->output_buffer_length = (size_t)bytes_out;
+ encoder->output_buffer_position = 0;
+ return true;
+}
+
+static size_t
+twolame_encoder_read(Encoder *_encoder, void *dest, size_t length)
+{
+ TwolameEncoder *encoder = (TwolameEncoder *)_encoder;
+
+ assert(encoder->output_buffer_position <=
+ encoder->output_buffer_length);
+
+ if (encoder->output_buffer_position == encoder->output_buffer_length &&
+ encoder->flush) {
+ int ret = twolame_encode_flush(encoder->options,
+ encoder->output_buffer,
+ sizeof(encoder->output_buffer));
+ if (ret > 0) {
+ encoder->output_buffer_length = (size_t)ret;
+ encoder->output_buffer_position = 0;
+ }
+
+ encoder->flush = false;
+ }
+
+
+ const size_t remainning = encoder->output_buffer_length
+ - encoder->output_buffer_position;
+ if (length > remainning)
+ length = remainning;
+
+ memcpy(dest, encoder->output_buffer + encoder->output_buffer_position,
+ length);
+
+ encoder->output_buffer_position += length;
+
+ return length;
+}
+
+static const char *
+twolame_encoder_get_mime_type(gcc_unused Encoder *_encoder)
+{
+ return "audio/mpeg";
+}
+
+const EncoderPlugin twolame_encoder_plugin = {
+ "twolame",
+ twolame_encoder_init,
+ twolame_encoder_finish,
+ twolame_encoder_open,
+ twolame_encoder_close,
+ twolame_encoder_flush,
+ twolame_encoder_flush,
+ nullptr,
+ nullptr,
+ twolame_encoder_write,
+ twolame_encoder_read,
+ twolame_encoder_get_mime_type,
+};