1 /* 2 * Copyright (c) 2011 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 "structs.h" 12 #include "bandwidth_estimator.h" 13 #include "entropy_coding.h" 14 #include "codec.h" 15 16 17 int 18 WebRtcIsac_EstimateBandwidth( 19 BwEstimatorstr* bwest_str, 20 Bitstr* streamdata, 21 WebRtc_Word32 packet_size, 22 WebRtc_UWord16 rtp_seq_number, 23 WebRtc_UWord32 send_ts, 24 WebRtc_UWord32 arr_ts, 25 enum IsacSamplingRate encoderSampRate, 26 enum IsacSamplingRate decoderSampRate) 27 { 28 WebRtc_Word16 index; 29 WebRtc_Word16 frame_samples; 30 WebRtc_UWord32 sendTimestampIn16kHz; 31 WebRtc_UWord32 arrivalTimestampIn16kHz; 32 WebRtc_UWord32 diffSendTime; 33 WebRtc_UWord32 diffArrivalTime; 34 int err; 35 36 /* decode framelength and BW estimation */ 37 err = WebRtcIsac_DecodeFrameLen(streamdata, &frame_samples); 38 if(err < 0) // error check 39 { 40 return err; 41 } 42 err = WebRtcIsac_DecodeSendBW(streamdata, &index); 43 if(err < 0) // error check 44 { 45 return err; 46 } 47 48 /* UPDATE ESTIMATES FROM OTHER SIDE */ 49 err = WebRtcIsac_UpdateUplinkBwImpl(bwest_str, index, encoderSampRate); 50 if(err < 0) 51 { 52 return err; 53 } 54 55 // We like BWE to work at 16 kHz sampling rate, 56 // therefore, we have to change the timestamps accordingly. 57 // translate the send timestamp if required 58 diffSendTime = (WebRtc_UWord32)((WebRtc_UWord32)send_ts - 59 (WebRtc_UWord32)bwest_str->senderTimestamp); 60 bwest_str->senderTimestamp = send_ts; 61 62 diffArrivalTime = (WebRtc_UWord32)((WebRtc_UWord32)arr_ts - 63 (WebRtc_UWord32)bwest_str->receiverTimestamp); 64 bwest_str->receiverTimestamp = arr_ts; 65 66 if(decoderSampRate == kIsacSuperWideband) 67 { 68 diffArrivalTime = (WebRtc_UWord32)diffArrivalTime >> 1; 69 diffSendTime = (WebRtc_UWord32)diffSendTime >> 1; 70 } 71 // arrival timestamp in 16 kHz 72 arrivalTimestampIn16kHz = (WebRtc_UWord32)((WebRtc_UWord32) 73 bwest_str->prev_rec_arr_ts + (WebRtc_UWord32)diffArrivalTime); 74 // send timestamp in 16 kHz 75 sendTimestampIn16kHz = (WebRtc_UWord32)((WebRtc_UWord32) 76 bwest_str->prev_rec_send_ts + (WebRtc_UWord32)diffSendTime); 77 78 err = WebRtcIsac_UpdateBandwidthEstimator(bwest_str, rtp_seq_number, 79 (frame_samples * 1000) / FS, sendTimestampIn16kHz, 80 arrivalTimestampIn16kHz, packet_size); 81 // error check 82 if(err < 0) 83 { 84 return err; 85 } 86 87 return 0; 88 } 89
