1 files changed, 300 insertions, 0 deletions
diff --git a/src/encoder/LameEncoderPlugin.cxx b/src/encoder/LameEncoderPlugin.cxx
new file mode 100644
index 000000000..db93b93a3
--- /dev/null
+++ b/src/encoder/LameEncoderPlugin.cxx
@@ -0,0 +1,300 @@
+/*
+ * 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 "EncoderAPI.hxx"
+#include "AudioFormat.hxx"
+
+#include <lame/lame.h>
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+struct LameEncoder final {
+	Encoder encoder;
+
+	AudioFormat audio_format;
+	float quality;
+	int bitrate;
+
+	lame_global_flags *gfp;
+
+	unsigned char buffer[32768];
+	size_t buffer_length;
+
+	LameEncoder():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 = param.GetBlockValue("quality");
+	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 (param.GetBlockValue("bitrate") != 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 = param.GetBlockValue("bitrate");
+		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 Encoder *
+lame_encoder_init(const 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(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(Encoder *_encoder, AudioFormat &audio_format,
+		  GError **error)
+{
+	LameEncoder *encoder = (LameEncoder *)_encoder;
+
+	audio_format.format = SampleFormat::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(Encoder *_encoder)
+{
+	LameEncoder *encoder = (LameEncoder *)_encoder;
+
+	lame_close(encoder->gfp);
+}
+
+static bool
+lame_encoder_write(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 / encoder->audio_format.GetFrameSize();
+	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(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 Encoder *_encoder)
+{
+	return "audio/mpeg";
+}
+
+const EncoderPlugin 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,
+};