mpd/src/decoder/mpc_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 <mpcdec/mpcdec.h>
#include <glib.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_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];
long ret;
#define MPC_CHUNK_SIZE 4096
int32_t chunk[MPC_CHUNK_SIZE / sizeof(int32_t)];
int chunkpos = 0;
long bitRate = 0;
int32_t *dest = chunk;
unsigned long samplePos = 0;
mpc_uint32_t vbrUpdateAcc;
mpc_uint32_t vbrUpdateBits;
float total_time;
int i;
struct replay_gain_info *replayGainInfo = NULL;
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;
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));
while (true) {
if (decoder_get_command(mpd_decoder) == DECODE_COMMAND_SEEK) {
samplePos = decoder_seek_where(mpd_decoder) *
audio_format.sample_rate;
if (mpc_decoder_seek_sample(&decoder, samplePos)) {
dest = chunk;
chunkpos = 0;
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 || decoder_get_command(mpd_decoder) == DECODE_COMMAND_STOP)
break;
samplePos += ret;
/* ret is in samples, and we have stereo */
ret *= 2;
for (i = 0; i < ret; i++) {
*dest++ = convertSample(sample_buffer[i]);
chunkpos += sizeof(*dest);
if (chunkpos >= MPC_CHUNK_SIZE) {
total_time = ((float)samplePos) /
audio_format.sample_rate;
bitRate = vbrUpdateBits *
audio_format.sample_rate / 1152 / 1000;
decoder_data(mpd_decoder, inStream,
chunk, chunkpos,
total_time,
bitRate, replayGainInfo);
chunkpos = 0;
dest = chunk;
if (decoder_get_command(mpd_decoder) == DECODE_COMMAND_STOP)
break;
}
}
}
if (decoder_get_command(mpd_decoder) != DECODE_COMMAND_STOP &&
chunkpos > 0) {
total_time = ((float)samplePos) / audio_format.sample_rate;
bitRate =
vbrUpdateBits * audio_format.sample_rate / 1152 / 1000;
decoder_data(mpd_decoder, NULL,
chunk, chunkpos, total_time, bitRate,
replayGainInfo);
}
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)
{
struct tag *ret = NULL;
float total_time = mpcGetTime(file);
if (total_time < 0) {
g_debug("mpcTagDup: Failed to get Songlength of file: %s\n",
file);
return NULL;
}
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ret = tag_ape_load(file);
if (!ret)
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ret = tag_id3_load(file);
if (!ret)
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ret = tag_new();
ret->time = total_time;
return ret;
}
static const char *const mpcSuffixes[] = { "mpc", NULL };
const struct decoder_plugin mpcPlugin = {
.name = "mpc",
.stream_decode = mpc_decode,
.tag_dup = mpcTagDup,
.suffixes = mpcSuffixes,
};