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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef _CRAS_MIX_H
#define _CRAS_MIX_H
#include "cras_types.h"
struct cras_audio_shm;
/* SIMD optimisation flags */
#define CPU_X86_SSE4_2 1
#define CPU_X86_AVX 2
#define CPU_X86_AVX2 4
#define CPU_X86_FMA 8
void cras_mix_init(unsigned int flags);
/* Scale the given buffer with the provided scaler and increment.
* Args:
* fmt - The format (SND_PCM_FORMAT_*)
* buff - Buffer of samples to scale.
* frame - The number of frames to render.
* scaler - Amount to scale samples (0.0 - 1.0).
* increment - The increment(+/-) of scaler at each frame. The scaler after
* increasing/decreasing will be clipped at target.
* target - The value at which to clip the scaler.
* channel - Number of samples in a frame.
*/
void cras_scale_buffer_increment(snd_pcm_format_t fmt, uint8_t *buff,
unsigned int frame, float scaler,
float increment, float target, int channel);
/* Scale the given buffer with the provided scaler.
* Args:
* fmt - The format (SND_PCM_FORMAT_*)
* buff - Buffer of samples to scale.
* scaler - Amount to scale samples (0.0 - 1.0).
* count - The number of samples to render, on return holds the number
* actually mixed.
*/
void cras_scale_buffer(snd_pcm_format_t fmt, uint8_t *buff, unsigned int count,
float scaler);
/* Add src buffer to dst, scaling and setting mute.
* Args:
* fmt - The format (SND_PCM_FORMAT_*)
* dst - Buffer of samples to mix to.
* src - Buffer of samples to mix from.
* count - The number of samples to mix.
* index - If zero this is the first buffer written to dst.
* mute - Is the stream providing the buffer muted.
* mix_vol - Scaler for the buffer to be mixed.
*/
void cras_mix_add(snd_pcm_format_t fmt, uint8_t *dst, uint8_t *src,
unsigned int count, unsigned int index, int mute,
float mix_vol);
/* Add src buffer to dst with independent channel strides.
* Args:
* fmt - The format (SND_PCM_FORMAT_*)
* dst - Buffer of samples to mix to.
* src - Buffer of samples to mix from.
* count - The number of samples to mix.
* dst_stride - Stride between channel samples in dst in bytes.
* src_stride - Stride between channel samples in src in bytes.
* scaler - Amount to scale samples.
*/
void cras_mix_add_scale_stride(snd_pcm_format_t fmt, uint8_t *dst, uint8_t *src,
unsigned int count, unsigned int dst_stride,
unsigned int src_stride, float scaler);
/* Mutes the given buffer.
* Args:
* num_channel - Number of channels in data.
* frame_bytes - number of bytes in a frame.
* count - The number of frames to render.
*/
size_t cras_mix_mute_buffer(uint8_t *dst, size_t frame_bytes, size_t count);
#endif /* _CRAS_MIX_H */
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