cras/src/server/cras_mix_ops.h

/* 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_OPS_H_
#define CRAS_MIX_OPS_H_

#include <stdint.h>

#include "cras_system_state.h"

extern const struct cras_mix_ops mixer_ops;
extern const struct cras_mix_ops mixer_ops_sse42;
extern const struct cras_mix_ops mixer_ops_avx;
extern const struct cras_mix_ops mixer_ops_avx2;
extern const struct cras_mix_ops mixer_ops_fma;

/* Struct containing ops to implement mix/scale on a buffer of samples.
 * Different architecture can provide different implementations and wraps
 * the implementations into cras_mix_ops.
 * Different sample formats will be handled by different implementations.
 * The usage of each operation is explained in cras_mix.h
 *
 * Members:
 *   scale_buffer_increment: See cras_scale_buffer_increment.
 *   scale_buffer: See cras_scale_buffer.
 *   add: See cras_mix_add.
 *   add_scale_stride: See cras_mix_add_scale_stride.
 *   mute_buffer: cras_mix_mute_buffer.
 */
struct cras_mix_ops {
	void (*scale_buffer_increment)(snd_pcm_format_t fmt, uint8_t *buff,
				       unsigned int count, float scaler,
				       float increment, int step);
	void (*scale_buffer)(snd_pcm_format_t fmt, uint8_t *buff,
			unsigned int count, float scaler);
	void (*add)(snd_pcm_format_t fmt, uint8_t *dst, uint8_t *src,
		  unsigned int count, unsigned int index,
		  int mute, float mix_vol);
	void (*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);
	size_t (*mute_buffer)(uint8_t *dst,
			    size_t frame_bytes,
			    size_t count);
};
#endif