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| 1 /* |
| 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #ifndef WEBRTC_MODULES_AUDIO_MIXER_FRAME_COMBINER_H_ |
| 12 #define WEBRTC_MODULES_AUDIO_MIXER_FRAME_COMBINER_H_ |
| 13 |
| 14 #include <memory> |
| 15 #include <vector> |
| 16 |
| 17 #include "webrtc/modules/audio_processing/include/audio_processing.h" |
| 18 #include "webrtc/modules/include/module_common_types.h" |
| 19 |
| 20 namespace webrtc { |
| 21 |
| 22 class FrameCombiner { |
| 23 public: |
| 24 explicit FrameCombiner(bool use_apm_limiter); |
| 25 ~FrameCombiner(); |
| 26 |
| 27 // Combine several frames into one. Assumes sample_rate, |
| 28 // samples_per_channel of the input frames match the parameters. The |
| 29 // extra parameters are needed because 'mix_list' can be empty. |
| 30 void Combine(const std::vector<AudioFrame*>& mix_list, |
| 31 size_t number_of_channels, |
| 32 int sample_rate, |
| 33 AudioFrame* audio_frame_for_mixing) const; |
| 34 |
| 35 private: |
| 36 // Lower-level helper function called from Combine(...) when there |
| 37 // are several input frames. |
| 38 // |
| 39 // TODO(aleloi): change interface to ArrayView<int16_t> output_frame |
| 40 // once we have gotten rid of the APM limiter. |
| 41 // |
| 42 // Only the 'data' field of output_frame should be modified. The |
| 43 // rest are used for potentially sending the output to the APM |
| 44 // limiter. |
| 45 void CombineMultipleFrames( |
| 46 const std::vector<rtc::ArrayView<const int16_t>>& input_frames, |
| 47 AudioFrame* audio_frame_for_mixing) const; |
| 48 |
| 49 const bool use_apm_limiter_; |
| 50 std::unique_ptr<AudioProcessing> limiter_; |
| 51 }; |
| 52 } // namespace webrtc |
| 53 |
| 54 #endif // WEBRTC_MODULES_AUDIO_MIXER_FRAME_COMBINER_H_ |
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