【Android 高性能音频】AAudio 音频流 样本缓冲 相关配置 ( 通道数 | 样本格式 | 帧缓冲 | 采样率 | 每帧样本数 == 通道数 )（一）

#include <AAudio.h>

//创建构建器 , AAudio 音频流通过该构建器创建
    //声明 AAudio 音频流构建器 指针
    AAudioStreamBuilder *builder = nullptr;
    //创建 AAudio 音频流构建器 , 注意传入二维指针
    aaudio_result_t result = AAudio_createStreamBuilder(&builder);

// 设置音频流设备 ID
    AAudioStreamBuilder_setDeviceId(builder, playbackDeviceId_);

// 设置音频流方向
    AAudioStreamBuilder_setDirection(builder, AAUDIO_DIRECTION_OUTPUT);

AAudioStreamBuilder_setSharingMode(builder, AAUDIO_SHARING_MODE_EXCLUSIVE);

AAudioStreamBuilder_setPerformanceMode(builder, AAUDIO_PERFORMANCE_MODE_LOW_LATENCY);

// 设置通道个数
    AAudioStreamBuilder_setChannelCount(builder, sampleChannels_);

// 设置音频格式
    AAudioStreamBuilder_setFormat(builder, sampleFormat_);

// 设置每帧的缓冲区大小 , 可以通过该设置达到尽可能低的延迟
    AAudioStream_setBufferSizeInFrames(playStream_, framesPerBurst_);

AAUDIO_API void AAudioStreamBuilder_setChannelCount(
  AAudioStreamBuilder *builder,
  int32_t channelCount
)

// 设置通道个数
    AAudioStreamBuilder_setChannelCount(builder, sampleChannels_);

AAUDIO_API void AAudioStreamBuilder_setFormat(
  AAudioStreamBuilder *builder,
  aaudio_format_t format
)

// 设置音频格式
    AAudioStreamBuilder_setFormat(builder, sampleFormat_);

num {
    AAUDIO_FORMAT_INVALID = -1,
    AAUDIO_FORMAT_UNSPECIFIED = 0,
    /**
     * This format uses the int16_t data type.
     * The maximum range of the data is -32768 to 32767.
     */
    AAUDIO_FORMAT_PCM_I16,
    /**
     * This format uses the float data type.
     * The nominal range of the data is [-1.0f, 1.0f).
     * Values outside that range may be clipped.
     *
     * See also 'floatData' at
     * https://developer.android.com/reference/android/media/AudioTrack#write(float[],%20int,%20int,%20int)
     */
    AAUDIO_FORMAT_PCM_FLOAT
};
typedef int32_t aaudio_format_t