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Diffstat (limited to '')
-rw-r--r-- | src/PcmMix.hxx | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/PcmMix.hxx b/src/PcmMix.hxx new file mode 100644 index 000000000..bb7110d04 --- /dev/null +++ b/src/PcmMix.hxx @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2003-2013 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 MPD_PCM_MIX_HXX +#define MPD_PCM_MIX_HXX + +#include "audio_format.h" +#include "gcc.h" + +#include <stddef.h> + +/* + * Linearly mixes two PCM buffers. Both must have the same length and + * the same audio format. The formula is: + * + * s1 := s1 * portion1 + s2 * (1 - portion1) + * + * @param buffer1 the first PCM buffer, and the destination buffer + * @param buffer2 the second PCM buffer + * @param size the size of both buffers in bytes + * @param format the sample format of both buffers + * @param portion1 a number between 0.0 and 1.0 specifying the portion + * of the first buffer in the mix; portion2 = (1.0 - portion1). The value + * NaN is used by the MixRamp code to specify that simple addition is required. + * + * @return true on success, false if the format is not supported + */ +gcc_warn_unused_result +bool +pcm_mix(void *buffer1, const void *buffer2, size_t size, + enum sample_format format, float portion1); + +#endif |