audio_decoder_g711.cc (2363B)
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 #include "api/audio_codecs/g711/audio_decoder_g711.h" 12 13 #include <initializer_list> 14 #include <memory> 15 #include <optional> 16 #include <vector> 17 18 #include "absl/strings/match.h" 19 #include "api/audio_codecs/audio_codec_pair_id.h" 20 #include "api/audio_codecs/audio_decoder.h" 21 #include "api/audio_codecs/audio_format.h" 22 #include "api/field_trials_view.h" 23 #include "modules/audio_coding/codecs/g711/audio_decoder_pcm.h" 24 #include "rtc_base/checks.h" 25 #include "rtc_base/numerics/safe_conversions.h" 26 27 namespace webrtc { 28 29 std::optional<AudioDecoderG711::Config> AudioDecoderG711::SdpToConfig( 30 const SdpAudioFormat& format) { 31 const bool is_pcmu = absl::EqualsIgnoreCase(format.name, "PCMU"); 32 const bool is_pcma = absl::EqualsIgnoreCase(format.name, "PCMA"); 33 if (format.clockrate_hz == 8000 && format.num_channels >= 1 && 34 (is_pcmu || is_pcma)) { 35 Config config; 36 config.type = is_pcmu ? Config::Type::kPcmU : Config::Type::kPcmA; 37 config.num_channels = dchecked_cast<int>(format.num_channels); 38 if (!config.IsOk()) { 39 RTC_DCHECK_NOTREACHED(); 40 return std::nullopt; 41 } 42 return config; 43 } else { 44 return std::nullopt; 45 } 46 } 47 48 void AudioDecoderG711::AppendSupportedDecoders( 49 std::vector<AudioCodecSpec>* specs) { 50 for (const char* type : {"PCMU", "PCMA"}) { 51 specs->push_back({{type, 8000, 1}, {8000, 1, 64000}}); 52 } 53 } 54 55 std::unique_ptr<AudioDecoder> AudioDecoderG711::MakeAudioDecoder( 56 const Config& config, 57 std::optional<AudioCodecPairId> /*codec_pair_id*/, 58 const FieldTrialsView* /* field_trials */) { 59 if (!config.IsOk()) { 60 RTC_DCHECK_NOTREACHED(); 61 return nullptr; 62 } 63 switch (config.type) { 64 case Config::Type::kPcmU: 65 return std::make_unique<AudioDecoderPcmU>(config.num_channels); 66 case Config::Type::kPcmA: 67 return std::make_unique<AudioDecoderPcmA>(config.num_channels); 68 default: 69 RTC_DCHECK_NOTREACHED(); 70 return nullptr; 71 } 72 } 73 74 } // namespace webrtc