audio.h

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/*
 * Copyright (C) 2006:
 * Ken Prox <kprox@users.sourceforge.net>
 *
 * $Id: audio.h,v 1.30 2009/05/30 00:45:51 kprox Exp $
 * 
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */
#ifndef AUDIO_H
#define AUDIO_H

#include <stdint.h>

#define AUDIO_DEVICE_NAME_LENGTH    20

typedef struct ts_audio_device *p_audio_device;
typedef struct ts_audio_api *p_audio_api;

typedef enum te_audio_segments {
    BUFFER_SEGMENT_1 = 0,
    BUFFER_SEGMENT_2,
    AUDIO_BUFFER_SEGMENTS
} te_audio_segments;

typedef enum te_audio_channels {
    AUDIO_MONO = 0,
    AUDIO_STEREO
} te_audio_channels;

typedef void (*message_handler)(char* message);
typedef void (*audio_error_message_handler)(char* error_message);

typedef enum te_audio_rec_play {
    AUDIO_DEVICE_RECORD = 0,
    AUDIO_DEVICE_PLAY
} te_audio_rec_play;

typedef struct ts_audio_pub {
    te_audio_rec_play play_record;
    char name[AUDIO_DEVICE_NAME_LENGTH];
    int32_t samplesize;
    int32_t sample_frequency;
    int32_t format;
    int32_t handle;
    te_audio_segments buffer_segments;
    int32_t audio_buffer_size;
    int32_t fragsize;
    uint8_t *audio_buffer_raw;
    te_audio_channels dsp_channels;
    int32_t samples;
    audio_error_message_handler error_msg_handler;
} ts_audio_pub, *p_audio_pub;

typedef struct ts_audio_api {
    char*   audio_device_type_name;
    int32_t (*open)(p_audio_pub device);
    int32_t (*init)(p_audio_pub device);
    int32_t (*close)(p_audio_pub device);
    void (*play)(p_audio_pub device, te_audio_segments buffer_segment);
    void (*record)(p_audio_pub device, te_audio_segments buffer_segment);
} ts_audio_api;

#define AUDIO_DEVICE_TEMINATOR {0, NULL, NULL, NULL, NULL, NULL}

p_audio_device audio_create(uint32_t device_type,
                            te_audio_rec_play rec_play
                           );

int32_t audio_open(p_audio_device device, int32_t sample_frequency);

int32_t audio_close(p_audio_device device);

int32_t audio_init(p_audio_device device);

int32_t audio_destroy(p_audio_device *device);

void audio_capture(p_audio_device device, te_audio_segments buffer_segment);

void audio_capture_wait(p_audio_device device, te_audio_segments buffer_segment);

void audio_play(p_audio_device device, te_audio_segments buffer_segment);

void audio_raw2double(p_audio_device device, te_audio_segments buffer_segment, double *audio_data);

void audio_double2raw(p_audio_device device, te_audio_segments buffer_segment, double *audio_data);

void register_error_message_handler(message_handler handler);

uint32_t audio_device_samples_get(p_audio_device device);

int32_t audio_supported_device_types_get(void);

char* audio_device_type_name_get(int32_t audio_device_type_id);

void audio_device_name_set(p_audio_device device, const char *name);

void audio_device_name_get(p_audio_device device, char **name);

void audio_sample_rate_set(p_audio_device device, int32_t Hertz);

int32_t audio_sample_rate_get(p_audio_device device);

#endif /* AUDIO_H */

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