50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef PCM_MIX_H
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#define PCM_MIX_H
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#include "audio_format.h"
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#include <stdbool.h>
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#include <stddef.h>
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/*
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* Linearly mixes two PCM buffers. Both must have the same length and
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* the same audio format. The formula is:
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*
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* s1 := s1 * portion1 + s2 * (1 - portion1)
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*
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* @param buffer1 the first PCM buffer, and the destination buffer
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* @param buffer2 the second PCM buffer
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* @param size the size of both buffers in bytes
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* @param format the sample format of both buffers
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* @param portion1 a number between 0.0 and 1.0 specifying the portion
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* of the first buffer in the mix; portion2 = (1.0 - portion1). The value
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* NaN is used by the MixRamp code to specify that simple addition is required.
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*
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* @return true on success, false if the format is not supported
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*/
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G_GNUC_WARN_UNUSED_RESULT
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bool
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pcm_mix(void *buffer1, const void *buffer2, size_t size,
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enum sample_format format, float portion1);
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#endif
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