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5d3e6805f2
From the new header file: * MonoView<>: A single channel contiguous buffer of samples. * InterleavedView<>: Channel samples are interleaved (side-by-side) in the buffer. A single channel InterleavedView<> is the same thing as a MonoView<> * DeinterleavedView<>: Each channel's samples are contiguous within the buffer. Channels can be enumerated and accessing the individual channel data is done via MonoView<>. There are also a few utility functions that offer a unified way to check the properties regardless of what view type is in use. Bug: chromium:335805780 Change-Id: I28196f8f4ded4fadc72ee32b62af304c62f4fc47 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/349300 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42377}
78 lines
3.2 KiB
C++
78 lines
3.2 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef AUDIO_UTILITY_AUDIO_FRAME_OPERATIONS_H_
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#define AUDIO_UTILITY_AUDIO_FRAME_OPERATIONS_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "absl/base/attributes.h"
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#include "api/array_view.h"
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#include "api/audio/audio_frame.h"
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namespace webrtc {
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// TODO(andrew): consolidate this with utility.h and audio_frame_manipulator.h.
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// Change reference parameters to pointers. Consider using a namespace rather
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// than a class.
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class AudioFrameOperations {
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public:
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// Downmixes 4 channels `src_audio` to stereo `dst_audio`. This is an in-place
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// operation, meaning `src_audio` and `dst_audio` may point to the same
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// buffer.
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static void QuadToStereo(InterleavedView<const int16_t> src_audio,
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InterleavedView<int16_t> dst_audio);
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// `frame.num_channels_` will be updated. This version checks that
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// `num_channels_` is 4 channels.
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static int QuadToStereo(AudioFrame* frame);
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// Downmixes `src_channels` `src_audio` to `dst_channels` `dst_audio`.
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// This is an in-place operation, meaning `src_audio` and `dst_audio`
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// may point to the same buffer. Supported channel combinations are
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// Stereo to Mono, Quad to Mono, and Quad to Stereo.
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static void DownmixChannels(InterleavedView<const int16_t> src_audio,
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InterleavedView<int16_t> dst_audio);
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// `frame.num_channels_` will be updated. This version checks that
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// `num_channels_` and `dst_channels` are valid and performs relevant downmix.
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// Supported channel combinations are N channels to Mono, and Quad to Stereo.
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static void DownmixChannels(size_t dst_channels, AudioFrame* frame);
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// `frame.num_channels_` will be updated. This version checks that
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// `num_channels_` and `dst_channels` are valid and performs relevant
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// downmix. Supported channel combinations are Mono to N
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// channels. The single channel is replicated.
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static void UpmixChannels(size_t target_number_of_channels,
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AudioFrame* frame);
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// Swap the left and right channels of `frame`. Fails silently if `frame` is
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// not stereo.
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static void SwapStereoChannels(AudioFrame* frame);
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// Conditionally zero out contents of `frame` for implementing audio mute:
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// `previous_frame_muted` && `current_frame_muted` - Zero out whole frame.
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// `previous_frame_muted` && !`current_frame_muted` - Fade-in at frame start.
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// !`previous_frame_muted` && `current_frame_muted` - Fade-out at frame end.
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// !`previous_frame_muted` && !`current_frame_muted` - Leave frame untouched.
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static void Mute(AudioFrame* frame,
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bool previous_frame_muted,
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bool current_frame_muted);
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// Zero out contents of frame.
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static void Mute(AudioFrame* frame);
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static int ScaleWithSat(float scale, AudioFrame* frame);
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};
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} // namespace webrtc
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#endif // AUDIO_UTILITY_AUDIO_FRAME_OPERATIONS_H_
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