renamed decoder plugin "mpc" to "mpcdec"

This plugin is based on "libmpcdec".

1 files changed, 273 insertions, 0 deletions

diff --git a/src/decoder/mpcdec_plugin.c b/src/decoder/mpcdec_plugin.c
new file mode 100644
index 00000000..c84dfca9
--- /dev/null
+++ b/src/decoder/mpcdec_plugin.c
@@ -0,0 +1,273 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "../decoder_api.h"
+#include "config.h"
+
+#include <mpcdec/mpcdec.h>
+#include <glib.h>
+#include <unistd.h>
+
+typedef struct _MpcCallbackData {
+	struct input_stream *inStream;
+	struct decoder *decoder;
+} MpcCallbackData;
+
+static mpc_int32_t mpc_read_cb(void *vdata, void *ptr, mpc_int32_t size)
+{
+	MpcCallbackData *data = (MpcCallbackData *) vdata;
+
+	return decoder_read(data->decoder, data->inStream, ptr, size);
+}
+
+static mpc_bool_t mpc_seek_cb(void *vdata, mpc_int32_t offset)
+{
+	MpcCallbackData *data = (MpcCallbackData *) vdata;
+
+	return input_stream_seek(data->inStream, offset, SEEK_SET);
+}
+
+static mpc_int32_t mpc_tell_cb(void *vdata)
+{
+	MpcCallbackData *data = (MpcCallbackData *) vdata;
+
+	return (long)(data->inStream->offset);
+}
+
+static mpc_bool_t mpc_canseek_cb(void *vdata)
+{
+	MpcCallbackData *data = (MpcCallbackData *) vdata;
+
+	return data->inStream->seekable;
+}
+
+static mpc_int32_t mpc_getsize_cb(void *vdata)
+{
+	MpcCallbackData *data = (MpcCallbackData *) vdata;
+
+	return data->inStream->size;
+}
+
+/* this _looks_ performance-critical, don't de-inline -- eric */
+static inline int32_t convertSample(MPC_SAMPLE_FORMAT sample)
+{
+	/* only doing 16-bit audio for now */
+	int32_t val;
+
+	enum {
+		bits = 24,
+	};
+
+	const int clip_min = -1 << (bits - 1);
+	const int clip_max = (1 << (bits - 1)) - 1;
+
+#ifdef MPC_FIXED_POINT
+	const int shift = bits - MPC_FIXED_POINT_SCALE_SHIFT;
+
+	if (shift < 0)
+		val = sample << -shift;
+	else
+		val = sample << shift;
+#else
+	const int float_scale = 1 << (bits - 1);
+
+	val = sample * float_scale;
+#endif
+
+	if (val < clip_min)
+		val = clip_min;
+	else if (val > clip_max)
+		val = clip_max;
+
+	return val;
+}
+
+static void
+mpc_to_mpd_buffer(int32_t *dest, const MPC_SAMPLE_FORMAT *src,
+		  unsigned num_samples)
+{
+	while (num_samples-- > 0)
+		*dest++ = convertSample(*src++);
+}
+
+static void
+mpc_decode(struct decoder *mpd_decoder, struct input_stream *inStream)
+{
+	mpc_decoder decoder;
+	mpc_reader reader;
+	mpc_streaminfo info;
+	struct audio_format audio_format;
+
+	MpcCallbackData data;
+
+	MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH];
+
+	mpc_uint32_t ret;
+	int32_t chunk[G_N_ELEMENTS(sample_buffer)];
+	long bitRate = 0;
+	unsigned long samplePos = 0;
+	mpc_uint32_t vbrUpdateAcc;
+	mpc_uint32_t vbrUpdateBits;
+	float total_time;
+	struct replay_gain_info *replayGainInfo = NULL;
+	enum decoder_command cmd = DECODE_COMMAND_NONE;
+
+	data.inStream = inStream;
+	data.decoder = mpd_decoder;
+
+	reader.read = mpc_read_cb;
+	reader.seek = mpc_seek_cb;
+	reader.tell = mpc_tell_cb;
+	reader.get_size = mpc_getsize_cb;
+	reader.canseek = mpc_canseek_cb;
+	reader.data = &data;
+
+	mpc_streaminfo_init(&info);
+
+	if ((ret = mpc_streaminfo_read(&info, &reader)) != ERROR_CODE_OK) {
+		if (decoder_get_command(mpd_decoder) != DECODE_COMMAND_STOP)
+			g_warning("Not a valid musepack stream\n");
+		return;
+	}
+
+	mpc_decoder_setup(&decoder, &reader);
+
+	if (!mpc_decoder_initialize(&decoder, &info)) {
+		if (decoder_get_command(mpd_decoder) != DECODE_COMMAND_STOP)
+			g_warning("Not a valid musepack stream\n");
+		return;
+	}
+
+	audio_format.bits = 24;
+	audio_format.channels = info.channels;
+	audio_format.sample_rate = info.sample_freq;
+
+	if (!audio_format_valid(&audio_format)) {
+		g_warning("Invalid audio format: %u:%u:%u\n",
+			  audio_format.sample_rate,
+			  audio_format.bits,
+			  audio_format.channels);
+		return;
+	}
+
+	replayGainInfo = replay_gain_info_new();
+	replayGainInfo->tuples[REPLAY_GAIN_ALBUM].gain = info.gain_album * 0.01;
+	replayGainInfo->tuples[REPLAY_GAIN_ALBUM].peak = info.peak_album / 32767.0;
+	replayGainInfo->tuples[REPLAY_GAIN_TRACK].gain = info.gain_title * 0.01;
+	replayGainInfo->tuples[REPLAY_GAIN_TRACK].peak = info.peak_title / 32767.0;
+
+	decoder_initialized(mpd_decoder, &audio_format,
+			    inStream->seekable,
+			    mpc_streaminfo_get_length(&info));
+
+	do {
+		if (cmd == DECODE_COMMAND_SEEK) {
+			samplePos = decoder_seek_where(mpd_decoder) *
+				audio_format.sample_rate;
+			if (mpc_decoder_seek_sample(&decoder, samplePos))
+				decoder_command_finished(mpd_decoder);
+			else
+				decoder_seek_error(mpd_decoder);
+		}
+
+		vbrUpdateAcc = 0;
+		vbrUpdateBits = 0;
+		ret = mpc_decoder_decode(&decoder, sample_buffer,
+					 &vbrUpdateAcc, &vbrUpdateBits);
+		if (ret == 0 || ret == (mpc_uint32_t)-1)
+			break;
+
+		samplePos += ret;
+
+		ret *= info.channels;
+
+		mpc_to_mpd_buffer(chunk, sample_buffer, ret);
+
+		total_time = ((float)samplePos) / audio_format.sample_rate;
+		bitRate = vbrUpdateBits * audio_format.sample_rate
+			/ 1152 / 1000;
+
+		cmd = decoder_data(mpd_decoder, inStream,
+				   chunk, ret * sizeof(chunk[0]),
+				   total_time,
+				   bitRate, replayGainInfo);
+	} while (cmd != DECODE_COMMAND_STOP);
+
+	replay_gain_info_free(replayGainInfo);
+}
+
+static float mpcGetTime(const char *file)
+{
+	struct input_stream inStream;
+	float total_time = -1;
+
+	mpc_reader reader;
+	mpc_streaminfo info;
+	MpcCallbackData data;
+
+	data.inStream = &inStream;
+	data.decoder = NULL;
+
+	reader.read = mpc_read_cb;
+	reader.seek = mpc_seek_cb;
+	reader.tell = mpc_tell_cb;
+	reader.get_size = mpc_getsize_cb;
+	reader.canseek = mpc_canseek_cb;
+	reader.data = &data;
+
+	mpc_streaminfo_init(&info);
+
+	if (!input_stream_open(&inStream, file))
+		return -1;
+
+	if (mpc_streaminfo_read(&info, &reader) != ERROR_CODE_OK) {
+		input_stream_close(&inStream);
+		return -1;
+	}
+
+	total_time = mpc_streaminfo_get_length(&info);
+
+	input_stream_close(&inStream);
+
+	return total_time;
+}
+
+static struct tag *mpcTagDup(const char *file)
+{
+	float total_time = mpcGetTime(file);
+	struct tag *tag;
+
+	if (total_time < 0) {
+		g_debug("mpcTagDup: Failed to get Songlength of file: %s\n",
+			file);
+		return NULL;
+	}
+
+	tag = tag_new();
+	tag->time = total_time;
+	return tag;
+}
+
+static const char *const mpcSuffixes[] = { "mpc", NULL };
+
+const struct decoder_plugin mpcdec_decoder_plugin = {
+	.name = "mpc",
+	.stream_decode = mpc_decode,
+	.tag_dup = mpcTagDup,
+	.suffixes = mpcSuffixes,
+};