mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-22 19:00:01 +08:00
137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include "AACRtp.h"
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#define AAC_MAX_FRAME_SIZE (2 * 1024)
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namespace mediakit{
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AACRtpEncoder::AACRtpEncoder(uint32_t ui32Ssrc,
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uint32_t ui32MtuSize,
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uint32_t ui32SampleRate,
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uint8_t ui8PayloadType,
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uint8_t ui8Interleaved) :
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RtpInfo(ui32Ssrc,
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ui32MtuSize,
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ui32SampleRate,
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ui8PayloadType,
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ui8Interleaved){
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}
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void AACRtpEncoder::inputFrame(const Frame::Ptr &frame) {
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GET_CONFIG(uint32_t, cycleMS, Rtp::kCycleMS);
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auto uiStamp = frame->dts();
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auto pcData = frame->data() + frame->prefixSize();
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auto iLen = frame->size() - frame->prefixSize();
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uiStamp %= cycleMS;
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char *ptr = (char *) pcData;
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int iSize = iLen;
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while (iSize > 0) {
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if (iSize <= _ui32MtuSize - 20) {
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_aucSectionBuf[0] = 0;
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_aucSectionBuf[1] = 16;
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_aucSectionBuf[2] = iLen >> 5;
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_aucSectionBuf[3] = (iLen & 0x1F) << 3;
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memcpy(_aucSectionBuf + 4, ptr, iSize);
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makeAACRtp(_aucSectionBuf, iSize + 4, true, uiStamp);
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break;
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}
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_aucSectionBuf[0] = 0;
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_aucSectionBuf[1] = 16;
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_aucSectionBuf[2] = (iLen) >> 5;
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_aucSectionBuf[3] = (iLen & 0x1F) << 3;
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memcpy(_aucSectionBuf + 4, ptr, _ui32MtuSize - 20);
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makeAACRtp(_aucSectionBuf, _ui32MtuSize - 16, false, uiStamp);
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ptr += (_ui32MtuSize - 20);
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iSize -= (_ui32MtuSize - 20);
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}
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}
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void AACRtpEncoder::makeAACRtp(const void *data, unsigned int len, bool mark, uint32_t uiStamp) {
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RtpCodec::inputRtp(makeRtp(getTrackType(),data,len,mark,uiStamp), false);
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}
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/////////////////////////////////////////////////////////////////////////////////////
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AACRtpDecoder::AACRtpDecoder(const Track::Ptr &track){
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auto aacTrack = dynamic_pointer_cast<AACTrack>(track);
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if(!aacTrack || !aacTrack->ready()){
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WarnL << "该aac track无效!";
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}else{
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_aac_cfg = aacTrack->getAacCfg();
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}
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_adts = obtainFrame();
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}
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AACRtpDecoder::AACRtpDecoder() {
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_adts = obtainFrame();
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}
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AACFrame::Ptr AACRtpDecoder::obtainFrame() {
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//从缓存池重新申请对象，防止覆盖已经写入环形缓存的对象
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auto frame = ResourcePoolHelper<AACFrame>::obtainObj();
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frame->_prefix_size = ADTS_HEADER_LEN;
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//预留7个字节的空位以便后续覆盖
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frame->_buffer.assign(ADTS_HEADER_LEN,(char)0);
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return frame;
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}
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bool AACRtpDecoder::inputRtp(const RtpPacket::Ptr &rtppack, bool key_pos) {
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//rtp数据开始部分
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uint8_t *ptr = (uint8_t *) rtppack->data() + rtppack->offset;
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//rtp数据末尾
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const uint8_t *end = (uint8_t *) rtppack->data() + rtppack->size();
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//首2字节表示Au-Header的个数，单位bit，所以除以16得到Au-Header个数
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const uint16_t au_header_count = ((ptr[0] << 8) | ptr[1]) >> 4;
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//忽略Au-Header区
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ptr += 2 + au_header_count * 2;
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static const uint32_t max_size = AAC_MAX_FRAME_SIZE - ADTS_HEADER_LEN;
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while (ptr < end) {
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auto size = (uint32_t) (end - ptr);
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if(size > max_size){
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size = max_size;
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}
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if (_adts->size() + size > AAC_MAX_FRAME_SIZE) {
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//数据太多了，先清空
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flushData();
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}
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//追加aac数据
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_adts->_buffer.append((char *)ptr, size);
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_adts->_dts = rtppack->timeStamp;
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ptr += size;
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}
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if (rtppack->mark) {
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//最后一个rtp分片
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flushData();
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}
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return false;
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}
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void AACRtpDecoder::flushData() {
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if (_adts->size() == ADTS_HEADER_LEN) {
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//没有有效数据
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return;
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}
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//覆盖adts头
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dumpAacConfig(_aac_cfg, _adts->size(), (uint8_t *) _adts->data());
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RtpCodec::inputFrame(_adts);
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_adts = obtainFrame();
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}
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}//namespace mediakit
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