Data Definition

The output data structure of the AO module consists of the extra stream packet information (extData), packet size, and actual data. The data is specified by the RETURN_AUDIO_DATA command word in the VmiCmdAudio enumeration and returned to developers through callbacks.

Example:

VmiDataType module = AUDIO;
VmiCmd cmd = RETURN_AUDIO_PLAY_DATA;
AudioData audioData;
uint8_t* data = &audioData;
DataCallback(module, cmd, data, sizeof(AudioData));

struct AudioData {
    ExtDataAudio extData;               // Extra information
    uint32_t size;                      // Size
    uint8_t data[0];                    // Data
} __attribute__((packed));

struct ExtDataAudio {
    uint32_t audioType = OPUS;              // Encoding type: OPUS/PCM
    uint8_t channels = 2;                   // Number of audio channels. 1: MONO/2: STEREO (default)
    uint8_t audioBitDepth = 16;             // Sampling depth in bits: 8 or 16 (default)
    uint32_t sampleRate = 48000;            // Sampling rate in Hz: 44100 or 48000 (default)
    uint32_t sampleInterval = 10;           // Sampling interval in ms: 10 (default)
    int64_t timestamp;                      // Audio data timestamp in ms (UTC time)
} __attribute__((packed));