/* 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 */ #ifndef MPD_PCM_UTILS_H #define MPD_PCM_UTILS_H #include "pcm_resample.h" #include "pcm_dither.h" #include <stdint.h> #include <stddef.h> struct audio_format; enum { /** this value means "100% volume" */ PCM_VOLUME_1 = 1000, }; struct pcm_convert_state { struct pcm_resample_state resample; struct pcm_dither_24 dither; /* Strict C99 doesn't allow empty structs */ int error; }; /** * Converts a float value (0.0 = silence, 1.0 = 100% volume) to an * integer volume value (1000 = 100%). */ static inline int pcm_float_to_volume(float volume) { return volume * PCM_VOLUME_1 + 0.5; } void pcm_volume(char *buffer, int bufferSize, const struct audio_format *format, int volume); void pcm_mix(char *buffer1, const char *buffer2, size_t size, const struct audio_format *format, float portion1); void pcm_convert_init(struct pcm_convert_state *state); size_t pcm_convert(const struct audio_format *inFormat, const char *inBuffer, size_t inSize, const struct audio_format *outFormat, char *outBuffer, struct pcm_convert_state *convState); size_t pcm_convert_size(const struct audio_format *inFormat, size_t inSize, const struct audio_format *outFormat); #endif