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 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_G722_AUDIO_DECODER_G722_H_ 12 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_G722_AUDIO_DECODER_G722_H_ 13 14 #include "webrtc/modules/audio_coding/codecs/audio_decoder.h" 15 16 typedef struct WebRtcG722DecInst G722DecInst; 17 18 namespace webrtc { 19 20 class AudioDecoderG722 final : public AudioDecoder { 21 public: 22 AudioDecoderG722(); 23 ~AudioDecoderG722() override; 24 bool HasDecodePlc() const override; 25 void Reset() override; 26 int PacketDuration(const uint8_t* encoded, size_t encoded_len) const override; 27 size_t Channels() const override; 28 29 protected: 30 int DecodeInternal(const uint8_t* encoded, 31 size_t encoded_len, 32 int sample_rate_hz, 33 int16_t* decoded, 34 SpeechType* speech_type) override; 35 36 private: 37 G722DecInst* dec_state_; 38 RTC_DISALLOW_COPY_AND_ASSIGN(AudioDecoderG722); 39 }; 40 41 class AudioDecoderG722Stereo final : public AudioDecoder { 42 public: 43 AudioDecoderG722Stereo(); 44 ~AudioDecoderG722Stereo() override; 45 void Reset() override; 46 47 protected: 48 int DecodeInternal(const uint8_t* encoded, 49 size_t encoded_len, 50 int sample_rate_hz, 51 int16_t* decoded, 52 SpeechType* speech_type) override; 53 size_t Channels() const override; 54 55 private: 56 // Splits the stereo-interleaved payload in |encoded| into separate payloads 57 // for left and right channels. The separated payloads are written to 58 // |encoded_deinterleaved|, which must hold at least |encoded_len| samples. 59 // The left channel starts at offset 0, while the right channel starts at 60 // offset encoded_len / 2 into |encoded_deinterleaved|. 61 void SplitStereoPacket(const uint8_t* encoded, 62 size_t encoded_len, 63 uint8_t* encoded_deinterleaved); 64 65 G722DecInst* dec_state_left_; 66 G722DecInst* dec_state_right_; 67 RTC_DISALLOW_COPY_AND_ASSIGN(AudioDecoderG722Stereo); 68 }; 69 70 } // namespace webrtc 71 72 #endif // WEBRTC_MODULES_AUDIO_CODING_CODECS_G722_AUDIO_DECODER_G722_H_ 73