/* 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 mpcPlugin = { .name = "mpc", .stream_decode = mpc_decode, .tag_dup = mpcTagDup, .suffixes = mpcSuffixes, };