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/*
* 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.
*/
#ifndef API_AUDIO_CODECS_OPUS_AUDIO_DECODER_MULTI_CHANNEL_OPUS_CONFIG_H_
#define API_AUDIO_CODECS_OPUS_AUDIO_DECODER_MULTI_CHANNEL_OPUS_CONFIG_H_
#include <vector>
#include "api/audio_codecs/audio_decoder.h"
namespace webrtc {
struct AudioDecoderMultiChannelOpusConfig {
// The number of channels that the decoder will output.
int num_channels;
// Number of mono or stereo encoded Opus streams.
int num_streams;
// Number of channel pairs coupled together, see RFC 7845 section
// 5.1.1. Has to be less than the number of streams.
int coupled_streams;
// Channel mapping table, defines the mapping from encoded streams to output
// channels. See RFC 7845 section 5.1.1.
std::vector<unsigned char> channel_mapping;
bool IsOk() const {
if (num_channels < 1 || num_channels > AudioDecoder::kMaxNumberOfChannels ||
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 put silence in output channel x.
if (x >= max_coded_channel && x != 255) {
return false;
}
}
if (num_channels > 255 || max_coded_channel >= 255) {
return false;
}
return true;
}
};
} // namespace webrtc
#endif // API_AUDIO_CODECS_OPUS_AUDIO_DECODER_MULTI_CHANNEL_OPUS_CONFIG_H_
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