AudioPcmFrame

struct AudioPcmFrame {
                OPTIONAL_ENUM_SIZE_T {
                  kMaxDataSizeSamples = 3840,
                  kMaxDataSizeBytes = kMaxDataSizeSamples * sizeof(int16_t),
                };

                uint32_t capture_timestamp;
                size_t samples_per_channel_;
                int sample_rate_hz_;
                size_t num_channels_;
                rtc::BYTES_PER_SAMPLE bytes_per_sample;
                int16_t data_[kMaxDataSizeSamples];
              };