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Diffstat (limited to 'third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.cc')
-rw-r--r-- | third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.cc | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.cc b/third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.cc new file mode 100644 index 0000000000..0052c429b2 --- /dev/null +++ b/third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.cc @@ -0,0 +1,106 @@ +/* + * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#include "api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.h" + +namespace webrtc { + +namespace { +constexpr int kDefaultComplexity = 9; +} // namespace + +AudioEncoderMultiChannelOpusConfig::AudioEncoderMultiChannelOpusConfig() + : frame_size_ms(kDefaultFrameSizeMs), + num_channels(1), + application(ApplicationMode::kVoip), + bitrate_bps(32000), + fec_enabled(false), + cbr_enabled(false), + dtx_enabled(false), + max_playback_rate_hz(48000), + complexity(kDefaultComplexity), + num_streams(-1), + coupled_streams(-1) {} +AudioEncoderMultiChannelOpusConfig::AudioEncoderMultiChannelOpusConfig( + const AudioEncoderMultiChannelOpusConfig&) = default; +AudioEncoderMultiChannelOpusConfig::~AudioEncoderMultiChannelOpusConfig() = + default; +AudioEncoderMultiChannelOpusConfig& AudioEncoderMultiChannelOpusConfig:: +operator=(const AudioEncoderMultiChannelOpusConfig&) = default; + +bool AudioEncoderMultiChannelOpusConfig::IsOk() const { + if (frame_size_ms <= 0 || frame_size_ms % 10 != 0) + return false; + if (num_channels >= 255) { + return false; + } + if (bitrate_bps < kMinBitrateBps || bitrate_bps > kMaxBitrateBps) + return false; + if (complexity < 0 || complexity > 10) + return false; + + // Check the lengths: + if (num_streams < 0 || coupled_streams < 0) { + return false; + } + if (num_streams < coupled_streams) { + return false; + } + if (channel_mapping.size() != static_cast<size_t>(num_channels)) { + return false; + } + + // Every mono stream codes one channel, every coupled stream codes two. This + // is the total coded channel count: + const int max_coded_channel = num_streams + coupled_streams; + for (const auto& x : channel_mapping) { + // Coded channels >= max_coded_channel don't exist. Except for 255, which + // tells Opus to ignore input channel x. + if (x >= max_coded_channel && x != 255) { + return false; + } + } + + // Inverse mapping. + constexpr int kNotSet = -1; + std::vector<int> coded_channels_to_input_channels(max_coded_channel, kNotSet); + for (size_t i = 0; i < num_channels; ++i) { + if (channel_mapping[i] == 255) { + continue; + } + + // If it's not ignored, put it in the inverted mapping. But first check if + // we've told Opus to use another input channel for this coded channel: + const int coded_channel = channel_mapping[i]; + if (coded_channels_to_input_channels[coded_channel] != kNotSet) { + // Coded channel `coded_channel` comes from both input channels + // `coded_channels_to_input_channels[coded_channel]` and `i`. + return false; + } + + coded_channels_to_input_channels[coded_channel] = i; + } + + // Check that we specified what input the encoder should use to produce + // every coded channel. + for (int i = 0; i < max_coded_channel; ++i) { + if (coded_channels_to_input_channels[i] == kNotSet) { + // Coded channel `i` has unspecified input channel. + return false; + } + } + + if (num_channels > 255 || max_coded_channel >= 255) { + return false; + } + return true; +} + +} // namespace webrtc |