// SPDX-License-Identifier: GPL-2.0

//

// mapper.h - an interface of muxer/demuxer between buffer with data frames and

//	      formatted files.

//

// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>

//

// Licensed under the terms of the GNU General Public License, version 2.

#ifndef __ALSA_UTILS_AXFER_MAPPER__H_

#define __ALSA_UTILS_AXFER_MAPPER__H_

#include "container.h"

enum mapper_type {

	MAPPER_TYPE_MUXER = 0,

	MAPPER_TYPE_DEMUXER,

	MAPPER_TYPE_COUNT,

};

enum mapper_target {

	MAPPER_TARGET_SINGLE = 0,

	MAPPER_TARGET_MULTIPLE,

	MAPPER_TARGET_COUNT,

};

struct mapper_ops;

struct mapper_context {

	enum mapper_type type;

	enum mapper_target target;

	const struct mapper_ops *ops;

	unsigned int private_size;

	void *private_data;

	unsigned int cntr_count;

	// A part of parameters of PCM substream.

	snd_pcm_access_t access;

	unsigned int bytes_per_sample;

	unsigned int samples_per_frame;

	snd_pcm_uframes_t frames_per_buffer;

	unsigned int verbose;

};

int mapper_context_init(struct mapper_context *mapper,

			enum mapper_type type, unsigned int cntr_count,

			unsigned int verbose);

int mapper_context_pre_process(struct mapper_context *mapper,

			       snd_pcm_access_t access,

			       unsigned int bytes_per_sample,

			       unsigned int samples_per_frame,

			       unsigned int frames_per_buffer,

			       struct container_context *cntrs);

int mapper_context_process_frames(struct mapper_context *mapper,

				  void *frame_buffer,

				  unsigned int *frame_count,

				  struct container_context *cntrs);

void mapper_context_post_process(struct mapper_context *mapper);

void mapper_context_destroy(struct mapper_context *mapper);

// For internal use in 'mapper' module.

struct mapper_ops {

	int (*pre_process)(struct mapper_context *mapper,

			   struct container_context *cntrs,

			   unsigned int cntr_count);

	int (*process_frames)(struct mapper_context *mapper,

			      void *frame_buffer, unsigned int *frame_count,

			      struct container_context *cntrs,

			      unsigned int cntr_count);

	void (*post_process)(struct mapper_context *mapper);

};

struct mapper_data {

	struct mapper_ops ops;

	unsigned int private_size;

};

extern const struct mapper_data mapper_muxer_single;

extern const struct mapper_data mapper_demuxer_single;

extern const struct mapper_data mapper_muxer_multiple;

extern const struct mapper_data mapper_demuxer_multiple;

#endif