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-rw-r--r--src/decoder/mpcdec_plugin.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/src/decoder/mpcdec_plugin.c b/src/decoder/mpcdec_plugin.c
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+++ b/src/decoder/mpcdec_plugin.c
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+/* 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,
+};