Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2015 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 "webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.h"
      12             : 
      13             : #include "webrtc/base/checks.h"
      14             : #include "webrtc/modules/audio_coding/codecs/legacy_encoded_audio_frame.h"
      15             : #include "webrtc/modules/audio_coding/codecs/pcm16b/pcm16b.h"
      16             : 
      17             : namespace webrtc {
      18             : 
      19           0 : AudioDecoderPcm16B::AudioDecoderPcm16B(int sample_rate_hz, size_t num_channels)
      20           0 :     : sample_rate_hz_(sample_rate_hz), num_channels_(num_channels) {
      21           0 :   RTC_DCHECK(sample_rate_hz == 8000 || sample_rate_hz == 16000 ||
      22             :              sample_rate_hz == 32000 || sample_rate_hz == 48000)
      23           0 :       << "Unsupported sample rate " << sample_rate_hz;
      24           0 :   RTC_DCHECK_GE(num_channels, 1);
      25           0 : }
      26             : 
      27           0 : void AudioDecoderPcm16B::Reset() {}
      28             : 
      29           0 : int AudioDecoderPcm16B::SampleRateHz() const {
      30           0 :   return sample_rate_hz_;
      31             : }
      32             : 
      33           0 : size_t AudioDecoderPcm16B::Channels() const {
      34           0 :   return num_channels_;
      35             : }
      36             : 
      37           0 : int AudioDecoderPcm16B::DecodeInternal(const uint8_t* encoded,
      38             :                                        size_t encoded_len,
      39             :                                        int sample_rate_hz,
      40             :                                        int16_t* decoded,
      41             :                                        SpeechType* speech_type) {
      42           0 :   RTC_DCHECK_EQ(sample_rate_hz_, sample_rate_hz);
      43           0 :   size_t ret = WebRtcPcm16b_Decode(encoded, encoded_len, decoded);
      44           0 :   *speech_type = ConvertSpeechType(1);
      45           0 :   return static_cast<int>(ret);
      46             : }
      47             : 
      48           0 : std::vector<AudioDecoder::ParseResult> AudioDecoderPcm16B::ParsePayload(
      49             :     rtc::Buffer&& payload,
      50             :     uint32_t timestamp) {
      51           0 :   const int samples_per_ms = rtc::CheckedDivExact(sample_rate_hz_, 1000);
      52             :   return LegacyEncodedAudioFrame::SplitBySamples(
      53           0 :       this, std::move(payload), timestamp, samples_per_ms * 2 * num_channels_,
      54           0 :       samples_per_ms);
      55             : }
      56             : 
      57           0 : int AudioDecoderPcm16B::PacketDuration(const uint8_t* encoded,
      58             :                                        size_t encoded_len) const {
      59             :   // Two encoded byte per sample per channel.
      60           0 :   return static_cast<int>(encoded_len / (2 * Channels()));
      61             : }
      62             : 
      63             : }  // namespace webrtc