audio HAL 1.0接口是怎样的。给下样例看看

好的，以下是一个简单的 audio HAL 1.0 接口的示例：

#include <hardware/hardware.h>
#include <hardware/audio.h>

// 定义音频硬件抽象层（HAL）接口
struct audio_hw_device {
    struct hw_device_t common;
    int (*set_voice_volume)(struct audio_hw_device* dev, float volume);
    int (*set_master_volume)(struct audio_hw_device* dev, float volume);
    int (*set_mode)(struct audio_hw_device* dev, audio_mode_t mode);
    int (*set_mic_mute)(struct audio_hw_device* dev, bool state);
    int (*set_parameters)(struct audio_hw_device* dev, const char* kvpairs);
    char* (*get_parameters)(struct audio_hw_device* dev, const char* keys);
    int (*set_input_device)(struct audio_hw_device* dev, audio_devices_t device);
    int (*set_output_device)(struct audio_hw_device* dev, audio_devices_t device);
    int (*init_check)(const struct audio_hw_device* dev);
};

// 定义音频硬件抽象层（HAL）模块
struct audio_module {
    struct hw_module_t common;
};

// 定义音频硬件抽象层（HAL）模块方法
struct audio_module_methods {
    int (*open)(const struct hw_module_t* module, const char* name, struct hw_device_t** device);
    int (*close)(struct hw_device_t* device);
};

// 定义音频硬件抽象层（HAL）模块实例
struct audio_module HAL_MODULE_INFO_SYM = {
    .common = {
        .tag = HARDWARE_MODULE_TAG,
        .module_api_version = AUDIO_MODULE_API_VERSION_1_0,
        .hal_api_version = HARDWARE_HAL_API_VERSION,
        .id = "audio.default",
        .name = "Default audio HW HAL",
        .author = "The Android Open Source Project",
        .methods = &audio_module_methods,
    },
};

// 定义音频硬件抽象层（HAL）模块方法实现
static struct audio_hw_device* open_audio_device(const struct hw_module_t* module, const char* name, uint32_t device) {
    struct audio_hw_device* dev;
    dev = (struct audio_hw_device*)calloc(1, sizeof(struct audio_hw_device));
    dev->common.tag = HARDWARE_DEVICE_TAG;
    dev->common.version = AUDIO_DEVICE_API_VERSION_1_0;
    dev->common.module = (struct hw_module_t*)module;
    dev->set_voice_volume = NULL;
    dev->set_master_volume = NULL;
    dev->set_mode = NULL;
    dev->set_mic_mute = NULL;
    dev->set_parameters = NULL;
    dev->get_parameters = NULL;
    dev->set_input_device = NULL;
    dev->set_output_device = NULL;
    dev->init_check = NULL;
    return dev;
}

static int close_audio_device(struct audio_hw_device* dev) {
    free(dev);
    return 0;
}

static struct audio_module_methods audio_module_methods = {
    .open = open_audio_device,
    .close = close_audio_device,
};

这段代码演示了如何定义一个简单的 audio HAL 1.0 接口，包括定义音频硬件抽象层（HAL）接口、音频硬件抽象层（HAL）模块、音频硬件抽象层（HAL）模块方法和音频硬件抽象层（HAL）模块方法实现等。通过这些接口，音频 HAL 驱动程序可以与 Android 系统的其他组件进行通信，并与硬件设备进行交互。