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Diffstat (limited to 'src/pcm_volume.h')
-rw-r--r-- | src/pcm_volume.h | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/src/pcm_volume.h b/src/pcm_volume.h deleted file mode 100644 index 64e3c7641..000000000 --- a/src/pcm_volume.h +++ /dev/null @@ -1,81 +0,0 @@ -/* - * Copyright (C) 2003-2011 The Music Player Daemon Project - * 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., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#ifndef PCM_VOLUME_H -#define PCM_VOLUME_H - -#include "pcm_prng.h" -#include "audio_format.h" - -#include <stdint.h> -#include <stdbool.h> - -enum { - /** this value means "100% volume" */ - PCM_VOLUME_1 = 1024, -}; - -struct audio_format; - -/** - * 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; -} - -static inline float -pcm_volume_to_float(int volume) -{ - return (float)volume / (float)PCM_VOLUME_1; -} - -/** - * Returns the next volume dithering number, between -511 and +511. - * This number is taken from a global PRNG, see pcm_prng(). - */ -static inline int -pcm_volume_dither(void) -{ - static unsigned long state; - uint32_t r; - - r = state = pcm_prng(state); - - return (r & 511) - ((r >> 9) & 511); -} - -/** - * Adjust the volume of the specified PCM buffer. - * - * @param buffer the PCM buffer - * @param length the length of the PCM buffer - * @param format the sample format of the PCM buffer - * @param volume the volume between 0 and #PCM_VOLUME_1 - * @return true on success, false if the audio format is not supported - */ -bool -pcm_volume(void *buffer, size_t length, - enum sample_format format, - int volume); - -#endif |