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_amr.h" 12 13 #ifdef WEBRTC_CODEC_AMR 14 // NOTE! GSM AMR is not included in the open-source package. The following 15 // interface file is needed: 16 #include "webrtc/modules/audio_coding/main/codecs/amr/interface/amr_interface.h" 17 #include "webrtc/modules/audio_coding/main/interface/audio_coding_module_typedefs.h" 18 #include "webrtc/modules/audio_coding/main/acm2/acm_common_defs.h" 19 #include "webrtc/system_wrappers/interface/rw_lock_wrapper.h" 20 #include "webrtc/system_wrappers/interface/trace.h" 21 22 // The API in the header file should match the one below. 23 // 24 // int16_t WebRtcAmr_CreateEnc(AMR_encinst_t_** enc_inst); 25 // int16_t WebRtcAmr_CreateDec(AMR_decinst_t_** dec_inst); 26 // int16_t WebRtcAmr_FreeEnc(AMR_encinst_t_* enc_inst); 27 // int16_t WebRtcAmr_FreeDec(AMR_decinst_t_* dec_inst); 28 // int16_t WebRtcAmr_Encode(AMR_encinst_t_* enc_inst, 29 // int16_t* input, 30 // int16_t len, 31 // int16_t*output, 32 // int16_t mode); 33 // int16_t WebRtcAmr_EncoderInit(AMR_encinst_t_* enc_inst, 34 // int16_t dtx_mode); 35 // int16_t WebRtcAmr_EncodeBitmode(AMR_encinst_t_* enc_inst, 36 // int format); 37 // int16_t WebRtcAmr_Decode(AMR_decinst_t_* dec_inst); 38 // int16_t WebRtcAmr_DecodePlc(AMR_decinst_t_* dec_inst); 39 // int16_t WebRtcAmr_DecoderInit(AMR_decinst_t_* dec_inst); 40 // int16_t WebRtcAmr_DecodeBitmode(AMR_decinst_t_* dec_inst, 41 // int format); 42 #endif 43 44 namespace webrtc { 45 46 namespace acm2 { 47 48 #ifndef WEBRTC_CODEC_AMR 49 ACMAMR::ACMAMR(int16_t /* codec_id */) 50 : encoder_inst_ptr_(NULL), 51 encoding_mode_(-1), // Invalid value. 52 encoding_rate_(0), // Invalid value. 53 encoder_packing_format_(AMRBandwidthEfficient) { 54 return; 55 } 56 57 ACMAMR::~ACMAMR() { return; } 58 59 int16_t ACMAMR::InternalEncode(uint8_t* /* bitstream */, 60 int16_t* /* bitstream_len_byte */) { 61 return -1; 62 } 63 64 int16_t ACMAMR::EnableDTX() { return -1; } 65 66 int16_t ACMAMR::DisableDTX() { return -1; } 67 68 int16_t ACMAMR::InternalInitEncoder(WebRtcACMCodecParams* /* codec_params */) { 69 return -1; 70 } 71 72 ACMGenericCodec* ACMAMR::CreateInstance(void) { return NULL; } 73 74 int16_t ACMAMR::InternalCreateEncoder() { return -1; } 75 76 void ACMAMR::DestructEncoderSafe() { return; } 77 78 int16_t ACMAMR::SetBitRateSafe(const int32_t /* rate */) { return -1; } 79 80 int16_t ACMAMR::SetAMREncoderPackingFormat( 81 ACMAMRPackingFormat /* packing_format */) { 82 return -1; 83 } 84 85 ACMAMRPackingFormat ACMAMR::AMREncoderPackingFormat() const { 86 return AMRUndefined; 87 } 88 89 int16_t ACMAMR::SetAMRDecoderPackingFormat( 90 ACMAMRPackingFormat /* packing_format */) { 91 return -1; 92 } 93 94 ACMAMRPackingFormat ACMAMR::AMRDecoderPackingFormat() const { 95 return AMRUndefined; 96 } 97 98 #else //===================== Actual Implementation ======================= 99 100 #define WEBRTC_AMR_MR475 0 101 #define WEBRTC_AMR_MR515 1 102 #define WEBRTC_AMR_MR59 2 103 #define WEBRTC_AMR_MR67 3 104 #define WEBRTC_AMR_MR74 4 105 #define WEBRTC_AMR_MR795 5 106 #define WEBRTC_AMR_MR102 6 107 #define WEBRTC_AMR_MR122 7 108 109 ACMAMR::ACMAMR(int16_t codec_id) 110 : encoder_inst_ptr_(NULL), 111 encoding_mode_(-1), // invalid value 112 encoding_rate_(0) { // invalid value 113 codec_id_ = codec_id; 114 has_internal_dtx_ = true; 115 encoder_packing_format_ = AMRBandwidthEfficient; 116 return; 117 } 118 119 ACMAMR::~ACMAMR() { 120 if (encoder_inst_ptr_ != NULL) { 121 WebRtcAmr_FreeEnc(encoder_inst_ptr_); 122 encoder_inst_ptr_ = NULL; 123 } 124 return; 125 } 126 127 int16_t ACMAMR::InternalEncode(uint8_t* bitstream, 128 int16_t* bitstream_len_byte) { 129 int16_t vad_decision = 1; 130 // sanity check, if the rate is set correctly. we might skip this 131 // sanity check. if rate is not set correctly, initialization flag 132 // should be false and should not be here. 133 if ((encoding_mode_ < WEBRTC_AMR_MR475) || 134 (encoding_mode_ > WEBRTC_AMR_MR122)) { 135 *bitstream_len_byte = 0; 136 return -1; 137 } 138 *bitstream_len_byte = WebRtcAmr_Encode(encoder_inst_ptr_, 139 &in_audio_[in_audio_ix_read_], 140 frame_len_smpl_, 141 reinterpret_cast<int16_t*>(bitstream), 142 encoding_mode_); 143 144 // Update VAD, if internal DTX is used 145 if (has_internal_dtx_ && dtx_enabled_) { 146 if (*bitstream_len_byte <= (7 * frame_len_smpl_ / 160)) { 147 vad_decision = 0; 148 } 149 for (int16_t n = 0; n < MAX_FRAME_SIZE_10MSEC; n++) { 150 vad_label_[n] = vad_decision; 151 } 152 } 153 // increment the read index 154 in_audio_ix_read_ += frame_len_smpl_; 155 return *bitstream_len_byte; 156 } 157 158 int16_t ACMAMR::EnableDTX() { 159 if (dtx_enabled_) { 160 return 0; 161 } else if (encoder_exist_) { // check if encoder exist 162 // enable DTX 163 if (WebRtcAmr_EncoderInit(encoder_inst_ptr_, 1) < 0) { 164 return -1; 165 } 166 dtx_enabled_ = true; 167 return 0; 168 } else { 169 return -1; 170 } 171 } 172 173 int16_t ACMAMR::DisableDTX() { 174 if (!dtx_enabled_) { 175 return 0; 176 } else if (encoder_exist_) { // check if encoder exist 177 // disable DTX 178 if (WebRtcAmr_EncoderInit(encoder_inst_ptr_, 0) < 0) { 179 return -1; 180 } 181 dtx_enabled_ = false; 182 return 0; 183 } else { 184 // encoder doesn't exists, therefore disabling is harmless 185 return 0; 186 } 187 } 188 189 int16_t ACMAMR::InternalInitEncoder(WebRtcACMCodecParams* codec_params) { 190 int16_t status = SetBitRateSafe((codec_params->codec_inst).rate); 191 status += (WebRtcAmr_EncoderInit(encoder_inst_ptr_, 192 ((codec_params->enable_dtx) ? 1 : 0)) < 0) 193 ? -1 194 : 0; 195 status += 196 (WebRtcAmr_EncodeBitmode(encoder_inst_ptr_, encoder_packing_format_) < 0) 197 ? -1 198 : 0; 199 return (status < 0) ? -1 : 0; 200 } 201 202 ACMGenericCodec* ACMAMR::CreateInstance(void) { return NULL; } 203 204 int16_t ACMAMR::InternalCreateEncoder() { 205 return WebRtcAmr_CreateEnc(&encoder_inst_ptr_); 206 } 207 208 void ACMAMR::DestructEncoderSafe() { 209 if (encoder_inst_ptr_ != NULL) { 210 WebRtcAmr_FreeEnc(encoder_inst_ptr_); 211 encoder_inst_ptr_ = NULL; 212 } 213 // there is no encoder set the following 214 encoder_exist_ = false; 215 encoder_initialized_ = false; 216 encoding_mode_ = -1; // invalid value 217 encoding_rate_ = 0; // invalid value 218 } 219 220 int16_t ACMAMR::SetBitRateSafe(const int32_t rate) { 221 switch (rate) { 222 case 4750: { 223 encoding_mode_ = WEBRTC_AMR_MR475; 224 encoding_rate_ = 4750; 225 break; 226 } 227 case 5150: { 228 encoding_mode_ = WEBRTC_AMR_MR515; 229 encoding_rate_ = 5150; 230 break; 231 } 232 case 5900: { 233 encoding_mode_ = WEBRTC_AMR_MR59; 234 encoding_rate_ = 5900; 235 break; 236 } 237 case 6700: { 238 encoding_mode_ = WEBRTC_AMR_MR67; 239 encoding_rate_ = 6700; 240 break; 241 } 242 case 7400: { 243 encoding_mode_ = WEBRTC_AMR_MR74; 244 encoding_rate_ = 7400; 245 break; 246 } 247 case 7950: { 248 encoding_mode_ = WEBRTC_AMR_MR795; 249 encoding_rate_ = 7950; 250 break; 251 } 252 case 10200: { 253 encoding_mode_ = WEBRTC_AMR_MR102; 254 encoding_rate_ = 10200; 255 break; 256 } 257 case 12200: { 258 encoding_mode_ = WEBRTC_AMR_MR122; 259 encoding_rate_ = 12200; 260 break; 261 } 262 default: { 263 return -1; 264 } 265 } 266 return 0; 267 } 268 269 int16_t ACMAMR::SetAMREncoderPackingFormat(ACMAMRPackingFormat packing_format) { 270 if ((packing_format != AMRBandwidthEfficient) && 271 (packing_format != AMROctetAlligned) && 272 (packing_format != AMRFileStorage)) { 273 WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, unique_id_, 274 "Invalid AMR Encoder packing-format."); 275 return -1; 276 } else { 277 if (WebRtcAmr_EncodeBitmode(encoder_inst_ptr_, packing_format) < 0) { 278 return -1; 279 } else { 280 encoder_packing_format_ = packing_format; 281 return 0; 282 } 283 } 284 } 285 286 ACMAMRPackingFormat ACMAMR::AMREncoderPackingFormat() const { 287 return encoder_packing_format_; 288 } 289 290 int16_t ACMAMR::SetAMRDecoderPackingFormat( 291 ACMAMRPackingFormat /* packing_format */) { 292 // Not implemented. 293 return -1; 294 } 295 296 ACMAMRPackingFormat ACMAMR::AMRDecoderPackingFormat() const { 297 // Not implemented. 298 return AMRUndefined; 299 } 300 301 #endif 302 } // namespace acm2 303 304 } // namespace webrtc 305
