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 if (!config.IsOk()) {
32 RTC_DCHECK_NOTREACHED();
33 return absl::nullopt;
34 }
35 return config;
36 } else {
37 return absl::nullopt;
38 }
39 }
40
AppendSupportedDecoders(std::vector<AudioCodecSpec> * specs)41 void AudioDecoderG711::AppendSupportedDecoders(
42 std::vector<AudioCodecSpec>* specs) {
43 for (const char* type : {"PCMU", "PCMA"}) {
44 specs->push_back({{type, 8000, 1}, {8000, 1, 64000}});
45 }
46 }
47
MakeAudioDecoder(const Config & config,absl::optional<AudioCodecPairId>,const FieldTrialsView * field_trials)48 std::unique_ptr<AudioDecoder> AudioDecoderG711::MakeAudioDecoder(
49 const Config& config,
50 absl::optional<AudioCodecPairId> /*codec_pair_id*/,
51 const FieldTrialsView* field_trials) {
52 if (!config.IsOk()) {
53 RTC_DCHECK_NOTREACHED();
54 return nullptr;
55 }
56 switch (config.type) {
57 case Config::Type::kPcmU:
58 return std::make_unique<AudioDecoderPcmU>(config.num_channels);
59 case Config::Type::kPcmA:
60 return std::make_unique<AudioDecoderPcmA>(config.num_channels);
61 default:
62 RTC_DCHECK_NOTREACHED();
63 return nullptr;
64 }
65 }
66
67 } // namespace webrtc
68