1 /* 2 * Copyright (c) 2012 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/main/acm2/acm_g729.h" 12 13 #ifdef WEBRTC_CODEC_G729 14 // NOTE! G.729 is not included in the open-source package. Modify this file 15 // or your codec API to match the function calls and names of used G.729 API 16 // file. 17 #include "webrtc/modules/audio_coding/main/codecs/g729/interface/g729_interface.h" 18 #include "webrtc/modules/audio_coding/main/acm2/acm_common_defs.h" 19 #include "webrtc/modules/audio_coding/main/acm2/acm_receiver.h" 20 #include "webrtc/system_wrappers/interface/trace.h" 21 #endif 22 23 namespace webrtc { 24 25 namespace acm2 { 26 27 #ifndef WEBRTC_CODEC_G729 28 29 ACMG729::ACMG729(int16_t /* codec_id */) : encoder_inst_ptr_(NULL) {} 30 31 ACMG729::~ACMG729() { return; } 32 33 int16_t ACMG729::InternalEncode(uint8_t* /* bitstream */, 34 int16_t* /* bitstream_len_byte */) { 35 return -1; 36 } 37 38 int16_t ACMG729::EnableDTX() { return -1; } 39 40 int16_t ACMG729::DisableDTX() { return -1; } 41 42 int32_t ACMG729::ReplaceInternalDTXSafe(const bool /*replace_internal_dtx */) { 43 return -1; 44 } 45 46 int32_t ACMG729::IsInternalDTXReplacedSafe(bool* /* internal_dtx_replaced */) { 47 return -1; 48 } 49 50 int16_t ACMG729::InternalInitEncoder(WebRtcACMCodecParams* /* codec_params */) { 51 return -1; 52 } 53 54 ACMGenericCodec* ACMG729::CreateInstance(void) { return NULL; } 55 56 int16_t ACMG729::InternalCreateEncoder() { return -1; } 57 58 void ACMG729::DestructEncoderSafe() { return; } 59 60 #else //===================== Actual Implementation ======================= 61 ACMG729::ACMG729(int16_t codec_id) 62 : codec_id_(codec_id), 63 has_internal_dtx_(), 64 encoder_inst_ptr_(NULL) {} 65 66 ACMG729::~ACMG729() { 67 if (encoder_inst_ptr_ != NULL) { 68 // Delete encoder memory 69 WebRtcG729_FreeEnc(encoder_inst_ptr_); 70 encoder_inst_ptr_ = NULL; 71 } 72 return; 73 } 74 75 int16_t ACMG729::InternalEncode(uint8_t* bitstream, 76 int16_t* bitstream_len_byte) { 77 // Initialize before entering the loop 78 int16_t num_encoded_samples = 0; 79 int16_t tmp_len_byte = 0; 80 int16_t vad_decision = 0; 81 *bitstream_len_byte = 0; 82 while (num_encoded_samples < frame_len_smpl_) { 83 // Call G.729 encoder with pointer to encoder memory, input 84 // audio, number of samples and bitsream 85 tmp_len_byte = WebRtcG729_Encode( 86 encoder_inst_ptr_, &in_audio_[in_audio_ix_read_], 80, 87 reinterpret_cast<int16_t*>(&(bitstream[*bitstream_len_byte]))); 88 89 // increment the read index this tell the caller that how far 90 // we have gone forward in reading the audio buffer 91 in_audio_ix_read_ += 80; 92 93 // sanity check 94 if (tmp_len_byte < 0) { 95 // error has happened 96 *bitstream_len_byte = 0; 97 return -1; 98 } 99 100 // increment number of written bytes 101 *bitstream_len_byte += tmp_len_byte; 102 switch (tmp_len_byte) { 103 case 0: { 104 if (0 == num_encoded_samples) { 105 // this is the first 10 ms in this packet and there is 106 // no data generated, perhaps DTX is enabled and the 107 // codec is not generating any bit-stream for this 10 ms. 108 // we do not continue encoding this frame. 109 return 0; 110 } 111 break; 112 } 113 case 2: { 114 // check if G.729 internal DTX is enabled 115 if (has_internal_dtx_ && dtx_enabled_) { 116 vad_decision = 0; 117 for (int16_t n = 0; n < MAX_FRAME_SIZE_10MSEC; n++) { 118 vad_label_[n] = vad_decision; 119 } 120 } 121 // we got a SID and have to send out this packet no matter 122 // how much audio we have encoded 123 return *bitstream_len_byte; 124 } 125 case 10: { 126 vad_decision = 1; 127 // this is a valid length just continue encoding 128 break; 129 } 130 default: { 131 return -1; 132 } 133 } 134 135 // update number of encoded samples 136 num_encoded_samples += 80; 137 } 138 139 // update VAD decision vector 140 if (has_internal_dtx_ && !vad_decision && dtx_enabled_) { 141 for (int16_t n = 0; n < MAX_FRAME_SIZE_10MSEC; n++) { 142 vad_label_[n] = vad_decision; 143 } 144 } 145 146 // done encoding, return number of encoded bytes 147 return *bitstream_len_byte; 148 } 149 150 int16_t ACMG729::EnableDTX() { 151 if (dtx_enabled_) { 152 // DTX already enabled, do nothing 153 return 0; 154 } else if (encoder_exist_) { 155 // Re-init the G.729 encoder to turn on DTX 156 if (WebRtcG729_EncoderInit(encoder_inst_ptr_, 1) < 0) { 157 return -1; 158 } 159 dtx_enabled_ = true; 160 return 0; 161 } else { 162 return -1; 163 } 164 } 165 166 int16_t ACMG729::DisableDTX() { 167 if (!dtx_enabled_) { 168 // DTX already dissabled, do nothing 169 return 0; 170 } else if (encoder_exist_) { 171 // Re-init the G.729 decoder to turn off DTX 172 if (WebRtcG729_EncoderInit(encoder_inst_ptr_, 0) < 0) { 173 return -1; 174 } 175 dtx_enabled_ = false; 176 return 0; 177 } else { 178 // encoder doesn't exists, therefore disabling is harmless 179 return 0; 180 } 181 } 182 183 int32_t ACMG729::ReplaceInternalDTXSafe(const bool replace_internal_dtx) { 184 // This function is used to disable the G.729 built in DTX and use an 185 // external instead. 186 187 if (replace_internal_dtx == has_internal_dtx_) { 188 // Make sure we keep the DTX/VAD setting if possible 189 bool old_enable_dtx = dtx_enabled_; 190 bool old_enable_vad = vad_enabled_; 191 ACMVADMode old_mode = vad_mode_; 192 if (replace_internal_dtx) { 193 // Disable internal DTX before enabling external DTX 194 DisableDTX(); 195 } else { 196 // Disable external DTX before enabling internal 197 ACMGenericCodec::DisableDTX(); 198 } 199 has_internal_dtx_ = !replace_internal_dtx; 200 int16_t status = SetVADSafe(old_enable_dtx, old_enable_vad, old_mode); 201 // Check if VAD status has changed from inactive to active, or if error was 202 // reported 203 if (status == 1) { 204 vad_enabled_ = true; 205 return status; 206 } else if (status < 0) { 207 has_internal_dtx_ = replace_internal_dtx; 208 return -1; 209 } 210 } 211 return 0; 212 } 213 214 int32_t ACMG729::IsInternalDTXReplacedSafe(bool* internal_dtx_replaced) { 215 // Get status of wether DTX is replaced or not 216 *internal_dtx_replaced = !has_internal_dtx_; 217 return 0; 218 } 219 220 int16_t ACMG729::InternalInitEncoder(WebRtcACMCodecParams* codec_params) { 221 // Init G.729 encoder 222 return WebRtcG729_EncoderInit(encoder_inst_ptr_, 223 ((codec_params->enable_dtx) ? 1 : 0)); 224 } 225 226 ACMGenericCodec* ACMG729::CreateInstance(void) { 227 // Function not used 228 return NULL; 229 } 230 231 int16_t ACMG729::InternalCreateEncoder() { 232 // Create encoder memory 233 return WebRtcG729_CreateEnc(&encoder_inst_ptr_); 234 } 235 236 void ACMG729::DestructEncoderSafe() { 237 // Free encoder memory 238 encoder_exist_ = false; 239 encoder_initialized_ = false; 240 if (encoder_inst_ptr_ != NULL) { 241 WebRtcG729_FreeEnc(encoder_inst_ptr_); 242 encoder_inst_ptr_ = NULL; 243 } 244 } 245 246 #endif 247 248 } // namespace acm2 249 250 } // namespace webrtc 251