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 <memory>
14 #include <vector>
15
16 #include "absl/strings/match.h"
17 #include "modules/audio_coding/codecs/g711/audio_decoder_pcm.h"
18 #include "rtc_base/numerics/safe_conversions.h"
19
20 namespace webrtc {
21
SdpToConfig(const SdpAudioFormat & format)22 absl::optional<AudioDecoderG711::Config> AudioDecoderG711::SdpToConfig(
23 const SdpAudioFormat& format) {
24 const bool is_pcmu = absl::EqualsIgnoreCase(format.name, "PCMU");
25 const bool is_pcma = absl::EqualsIgnoreCase(format.name, "PCMA");
26 if (format.clockrate_hz == 8000 && format.num_channels >= 1 &&
27 (is_pcmu || is_pcma)) {
28 Config config;
29 config.type = is_pcmu ? Config::Type::kPcmU : Config::Type::kPcmA;
30 config.num_channels = rtc::dchecked_cast<int>(format.num_channels);
31 RTC_DCHECK(config.IsOk());
32 return config;
33 } else {
34 return absl::nullopt;
35 }
36 }
37
AppendSupportedDecoders(std::vector<AudioCodecSpec> * specs)38 void AudioDecoderG711::AppendSupportedDecoders(
39 std::vector<AudioCodecSpec>* specs) {
40 for (const char* type : {"PCMU", "PCMA"}) {
41 specs->push_back({{type, 8000, 1}, {8000, 1, 64000}});
42 }
43 }
44
MakeAudioDecoder(const Config & config,absl::optional<AudioCodecPairId>)45 std::unique_ptr<AudioDecoder> AudioDecoderG711::MakeAudioDecoder(
46 const Config& config,
47 absl::optional<AudioCodecPairId> /*codec_pair_id*/) {
48 RTC_DCHECK(config.IsOk());
49 switch (config.type) {
50 case Config::Type::kPcmU:
51 return std::make_unique<AudioDecoderPcmU>(config.num_channels);
52 case Config::Type::kPcmA:
53 return std::make_unique<AudioDecoderPcmA>(config.num_channels);
54 default:
55 return nullptr;
56 }
57 }
58
59 } // namespace webrtc
60