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-rw-r--r--src/encoder/LameEncoderPlugin.cxx303
1 files changed, 303 insertions, 0 deletions
diff --git a/src/encoder/LameEncoderPlugin.cxx b/src/encoder/LameEncoderPlugin.cxx
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+++ b/src/encoder/LameEncoderPlugin.cxx
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+/*
+ * Copyright (C) 2003-2013 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 "LameEncoderPlugin.hxx"
+#include "encoder_api.h"
+#include "encoder_plugin.h"
+#include "audio_format.h"
+
+#include <lame/lame.h>
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+struct LameEncoder final {
+ struct encoder encoder;
+
+ struct audio_format audio_format;
+ float quality;
+ int bitrate;
+
+ lame_global_flags *gfp;
+
+ unsigned char buffer[32768];
+ size_t buffer_length;
+
+ LameEncoder() {
+ encoder_struct_init(&encoder, &lame_encoder_plugin);
+ }
+
+ bool Configure(const config_param *param, GError **error);
+};
+
+static inline GQuark
+lame_encoder_quark(void)
+{
+ return g_quark_from_static_string("lame_encoder");
+}
+
+bool
+LameEncoder::Configure(const config_param *param, GError **error)
+{
+ const char *value;
+ char *endptr;
+
+ value = config_get_block_string(param, "quality", nullptr);
+ if (value != nullptr) {
+ /* a quality was configured (VBR) */
+
+ quality = g_ascii_strtod(value, &endptr);
+
+ if (*endptr != '\0' || quality < -1.0 || quality > 10.0) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "quality \"%s\" is not a number in the "
+ "range -1 to 10, line %i",
+ value, param->line);
+ return false;
+ }
+
+ if (config_get_block_string(param, "bitrate", nullptr) != nullptr) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "quality and bitrate are "
+ "both defined (line %i)",
+ param->line);
+ return false;
+ }
+ } else {
+ /* a bit rate was configured */
+
+ value = config_get_block_string(param, "bitrate", nullptr);
+ if (value == nullptr) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "neither bitrate nor quality defined "
+ "at line %i",
+ param->line);
+ return false;
+ }
+
+ quality = -2.0;
+ bitrate = g_ascii_strtoll(value, &endptr, 10);
+
+ if (*endptr != '\0' || bitrate <= 0) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "bitrate at line %i should be a positive integer",
+ param->line);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static struct encoder *
+lame_encoder_init(const struct config_param *param, GError **error_r)
+{
+ LameEncoder *encoder = new LameEncoder();
+
+ /* 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
+lame_encoder_finish(struct encoder *_encoder)
+{
+ LameEncoder *encoder = (LameEncoder *)_encoder;
+
+ /* the real liblame cleanup was already performed by
+ lame_encoder_close(), so no real work here */
+ g_free(encoder);
+}
+
+static bool
+lame_encoder_setup(LameEncoder *encoder, GError **error)
+{
+ if (encoder->quality >= -1.0) {
+ /* a quality was configured (VBR) */
+
+ if (0 != lame_set_VBR(encoder->gfp, vbr_rh)) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "error setting lame VBR mode");
+ return false;
+ }
+ if (0 != lame_set_VBR_q(encoder->gfp, encoder->quality)) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "error setting lame VBR quality");
+ return false;
+ }
+ } else {
+ /* a bit rate was configured */
+
+ if (0 != lame_set_brate(encoder->gfp, encoder->bitrate)) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "error setting lame bitrate");
+ return false;
+ }
+ }
+
+ if (0 != lame_set_num_channels(encoder->gfp,
+ encoder->audio_format.channels)) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "error setting lame num channels");
+ return false;
+ }
+
+ if (0 != lame_set_in_samplerate(encoder->gfp,
+ encoder->audio_format.sample_rate)) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "error setting lame sample rate");
+ return false;
+ }
+
+ if (0 != lame_set_out_samplerate(encoder->gfp,
+ encoder->audio_format.sample_rate)) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "error setting lame out sample rate");
+ return false;
+ }
+
+ if (0 > lame_init_params(encoder->gfp)) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "error initializing lame params");
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+lame_encoder_open(struct encoder *_encoder, struct audio_format *audio_format,
+ GError **error)
+{
+ LameEncoder *encoder = (LameEncoder *)_encoder;
+
+ audio_format->format = SAMPLE_FORMAT_S16;
+ audio_format->channels = 2;
+
+ encoder->audio_format = *audio_format;
+
+ encoder->gfp = lame_init();
+ if (encoder->gfp == nullptr) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "lame_init() failed");
+ return false;
+ }
+
+ if (!lame_encoder_setup(encoder, error)) {
+ lame_close(encoder->gfp);
+ return false;
+ }
+
+ encoder->buffer_length = 0;
+
+ return true;
+}
+
+static void
+lame_encoder_close(struct encoder *_encoder)
+{
+ LameEncoder *encoder = (LameEncoder *)_encoder;
+
+ lame_close(encoder->gfp);
+}
+
+static bool
+lame_encoder_write(struct encoder *_encoder,
+ const void *data, size_t length,
+ gcc_unused GError **error)
+{
+ LameEncoder *encoder = (LameEncoder *)_encoder;
+ const int16_t *src = (const int16_t*)data;
+
+ assert(encoder->buffer_length == 0);
+
+ const unsigned num_frames =
+ length / audio_format_frame_size(&encoder->audio_format);
+ float *left = g_new(float, num_frames);
+ float *right = g_new(float, num_frames);
+
+ /* this is for only 16-bit audio */
+
+ for (unsigned i = 0; i < num_frames; i++) {
+ left[i] = *src++;
+ right[i] = *src++;
+ }
+
+ int bytes_out = lame_encode_buffer_float(encoder->gfp, left, right,
+ num_frames, encoder->buffer,
+ sizeof(encoder->buffer));
+
+ g_free(left);
+ g_free(right);
+
+ if (bytes_out < 0) {
+ g_set_error(error, lame_encoder_quark(), 0,
+ "lame encoder failed");
+ return false;
+ }
+
+ encoder->buffer_length = (size_t)bytes_out;
+ return true;
+}
+
+static size_t
+lame_encoder_read(struct encoder *_encoder, void *dest, size_t length)
+{
+ LameEncoder *encoder = (LameEncoder *)_encoder;
+
+ if (length > encoder->buffer_length)
+ length = encoder->buffer_length;
+
+ memcpy(dest, encoder->buffer, length);
+
+ encoder->buffer_length -= length;
+ memmove(encoder->buffer, encoder->buffer + length,
+ encoder->buffer_length);
+
+ return length;
+}
+
+static const char *
+lame_encoder_get_mime_type(gcc_unused struct encoder *_encoder)
+{
+ return "audio/mpeg";
+}
+
+const struct encoder_plugin lame_encoder_plugin = {
+ "lame",
+ lame_encoder_init,
+ lame_encoder_finish,
+ lame_encoder_open,
+ lame_encoder_close,
+ nullptr,
+ nullptr,
+ nullptr,
+ nullptr,
+ lame_encoder_write,
+ lame_encoder_read,
+ lame_encoder_get_mime_type,
+};