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/opus/audio_decoder_opus.h" 12 13 #include "webrtc/base/checks.h" 14 15 namespace webrtc { 16 17 AudioDecoderOpus::AudioDecoderOpus(size_t num_channels) 18 : channels_(num_channels) { 19 RTC_DCHECK(num_channels == 1 || num_channels == 2); 20 WebRtcOpus_DecoderCreate(&dec_state_, channels_); 21 WebRtcOpus_DecoderInit(dec_state_); 22 } 23 24 AudioDecoderOpus::~AudioDecoderOpus() { 25 WebRtcOpus_DecoderFree(dec_state_); 26 } 27 28 int AudioDecoderOpus::DecodeInternal(const uint8_t* encoded, 29 size_t encoded_len, 30 int sample_rate_hz, 31 int16_t* decoded, 32 SpeechType* speech_type) { 33 RTC_DCHECK_EQ(sample_rate_hz, 48000); 34 int16_t temp_type = 1; // Default is speech. 35 int ret = 36 WebRtcOpus_Decode(dec_state_, encoded, encoded_len, decoded, &temp_type); 37 if (ret > 0) 38 ret *= static_cast<int>(channels_); // Return total number of samples. 39 *speech_type = ConvertSpeechType(temp_type); 40 return ret; 41 } 42 43 int AudioDecoderOpus::DecodeRedundantInternal(const uint8_t* encoded, 44 size_t encoded_len, 45 int sample_rate_hz, 46 int16_t* decoded, 47 SpeechType* speech_type) { 48 if (!PacketHasFec(encoded, encoded_len)) { 49 // This packet is a RED packet. 50 return DecodeInternal(encoded, encoded_len, sample_rate_hz, decoded, 51 speech_type); 52 } 53 54 RTC_DCHECK_EQ(sample_rate_hz, 48000); 55 int16_t temp_type = 1; // Default is speech. 56 int ret = WebRtcOpus_DecodeFec(dec_state_, encoded, encoded_len, decoded, 57 &temp_type); 58 if (ret > 0) 59 ret *= static_cast<int>(channels_); // Return total number of samples. 60 *speech_type = ConvertSpeechType(temp_type); 61 return ret; 62 } 63 64 void AudioDecoderOpus::Reset() { 65 WebRtcOpus_DecoderInit(dec_state_); 66 } 67 68 int AudioDecoderOpus::PacketDuration(const uint8_t* encoded, 69 size_t encoded_len) const { 70 return WebRtcOpus_DurationEst(dec_state_, encoded, encoded_len); 71 } 72 73 int AudioDecoderOpus::PacketDurationRedundant(const uint8_t* encoded, 74 size_t encoded_len) const { 75 if (!PacketHasFec(encoded, encoded_len)) { 76 // This packet is a RED packet. 77 return PacketDuration(encoded, encoded_len); 78 } 79 80 return WebRtcOpus_FecDurationEst(encoded, encoded_len); 81 } 82 83 bool AudioDecoderOpus::PacketHasFec(const uint8_t* encoded, 84 size_t encoded_len) const { 85 int fec; 86 fec = WebRtcOpus_PacketHasFec(encoded, encoded_len); 87 return (fec == 1); 88 } 89 90 size_t AudioDecoderOpus::Channels() const { 91 return channels_; 92 } 93 94 } // namespace webrtc 95
