| /* |
| * Copyright (c) 2015 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 "webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.h" |
| |
| #include "webrtc/base/checks.h" |
| #include "webrtc/modules/audio_coding/codecs/legacy_encoded_audio_frame.h" |
| #include "webrtc/modules/audio_coding/codecs/pcm16b/pcm16b.h" |
| |
| namespace webrtc { |
| |
| AudioDecoderPcm16B::AudioDecoderPcm16B(int sample_rate_hz, size_t num_channels) |
| : sample_rate_hz_(sample_rate_hz), num_channels_(num_channels) { |
| RTC_DCHECK(sample_rate_hz == 8000 || sample_rate_hz == 16000 || |
| sample_rate_hz == 32000 || sample_rate_hz == 48000) |
| << "Unsupported sample rate " << sample_rate_hz; |
| RTC_DCHECK_GE(num_channels, 1u); |
| } |
| |
| void AudioDecoderPcm16B::Reset() {} |
| |
| int AudioDecoderPcm16B::SampleRateHz() const { |
| return sample_rate_hz_; |
| } |
| |
| size_t AudioDecoderPcm16B::Channels() const { |
| return num_channels_; |
| } |
| |
| int AudioDecoderPcm16B::DecodeInternal(const uint8_t* encoded, |
| size_t encoded_len, |
| int sample_rate_hz, |
| int16_t* decoded, |
| SpeechType* speech_type) { |
| RTC_DCHECK_EQ(sample_rate_hz_, sample_rate_hz); |
| size_t ret = WebRtcPcm16b_Decode(encoded, encoded_len, decoded); |
| *speech_type = ConvertSpeechType(1); |
| return static_cast<int>(ret); |
| } |
| |
| std::vector<AudioDecoder::ParseResult> AudioDecoderPcm16B::ParsePayload( |
| rtc::Buffer&& payload, |
| uint32_t timestamp, |
| bool is_primary) { |
| const int samples_per_ms = rtc::CheckedDivExact(sample_rate_hz_, 1000); |
| return LegacyEncodedAudioFrame::SplitBySamples( |
| this, std::move(payload), timestamp, is_primary, |
| samples_per_ms * 2 * num_channels_, samples_per_ms); |
| } |
| |
| int AudioDecoderPcm16B::PacketDuration(const uint8_t* encoded, |
| size_t encoded_len) const { |
| // Two encoded byte per sample per channel. |
| return static_cast<int>(encoded_len / (2 * Channels())); |
| } |
| |
| } // namespace webrtc |