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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "structs.h"
#include "bandwidth_estimator.h"
#include "entropy_coding.h"
#include "codec.h"
int
WebRtcIsac_EstimateBandwidth(
BwEstimatorstr* bwest_str,
Bitstr* streamdata,
size_t packet_size,
uint16_t rtp_seq_number,
uint32_t send_ts,
uint32_t arr_ts,
enum IsacSamplingRate encoderSampRate,
enum IsacSamplingRate decoderSampRate)
{
int16_t index;
int16_t frame_samples;
uint32_t sendTimestampIn16kHz;
uint32_t arrivalTimestampIn16kHz;
uint32_t diffSendTime;
uint32_t diffArrivalTime;
int err;
/* decode framelength and BW estimation */
err = WebRtcIsac_DecodeFrameLen(streamdata, &frame_samples);
if(err < 0) // error check
{
return err;
}
err = WebRtcIsac_DecodeSendBW(streamdata, &index);
if(err < 0) // error check
{
return err;
}
/* UPDATE ESTIMATES FROM OTHER SIDE */
err = WebRtcIsac_UpdateUplinkBwImpl(bwest_str, index, encoderSampRate);
if(err < 0)
{
return err;
}
// We like BWE to work at 16 kHz sampling rate,
// therefore, we have to change the timestamps accordingly.
// translate the send timestamp if required
diffSendTime = (uint32_t)((uint32_t)send_ts -
(uint32_t)bwest_str->senderTimestamp);
bwest_str->senderTimestamp = send_ts;
diffArrivalTime = (uint32_t)((uint32_t)arr_ts -
(uint32_t)bwest_str->receiverTimestamp);
bwest_str->receiverTimestamp = arr_ts;
if(decoderSampRate == kIsacSuperWideband)
{
diffArrivalTime = (uint32_t)diffArrivalTime >> 1;
diffSendTime = (uint32_t)diffSendTime >> 1;
}
// arrival timestamp in 16 kHz
arrivalTimestampIn16kHz = (uint32_t)((uint32_t)
bwest_str->prev_rec_arr_ts + (uint32_t)diffArrivalTime);
// send timestamp in 16 kHz
sendTimestampIn16kHz = (uint32_t)((uint32_t)
bwest_str->prev_rec_send_ts + (uint32_t)diffSendTime);
err = WebRtcIsac_UpdateBandwidthEstimator(bwest_str, rtp_seq_number,
(frame_samples * 1000) / FS, sendTimestampIn16kHz,
arrivalTimestampIn16kHz, packet_size);
// error check
if(err < 0)
{
return err;
}
return 0;
}
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