mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-10-06 12:13:49 +08:00
135 lines
3.7 KiB
C++
135 lines
3.7 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/xia-chu/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 "AACRtmp.h"
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#include "Rtmp/Rtmp.h"
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namespace mediakit{
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static string getAacCfg(const RtmpPacket &thiz) {
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string ret;
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if (thiz.getMediaType() != FLV_CODEC_AAC) {
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return ret;
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}
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if (!thiz.isCfgFrame()) {
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return ret;
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}
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if (thiz.buffer.size() < 4) {
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WarnL << "bad aac cfg!";
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return ret;
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}
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ret = thiz.buffer.substr(2);
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return ret;
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}
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void AACRtmpDecoder::inputRtmp(const RtmpPacket::Ptr &pkt) {
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if (pkt->isCfgFrame()) {
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_aac_cfg = getAacCfg(*pkt);
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onGetAAC(nullptr, 0, 0);
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return;
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}
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if (!_aac_cfg.empty()) {
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onGetAAC(pkt->buffer.data() + 2, pkt->buffer.size() - 2, pkt->time_stamp);
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}
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}
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void AACRtmpDecoder::onGetAAC(const char* data, size_t len, uint32_t stamp) {
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auto frame = ResourcePoolHelper<FrameImp>::obtainObj();
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frame->_codec_id = CodecAAC;
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//生成adts头
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char adts_header[32] = {0};
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auto size = dumpAacConfig(_aac_cfg, len, (uint8_t *) adts_header, sizeof(adts_header));
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if (size > 0) {
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frame->_buffer.assign(adts_header, size);
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frame->_prefix_size = size;
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} else {
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frame->_buffer.clear();
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frame->_prefix_size = 0;
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}
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if(len > 0){
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//追加负载数据
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frame->_buffer.append(data, len);
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frame->_dts = stamp;
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}
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if(size > 0 || len > 0){
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//有adts头或者实际aac负载
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RtmpCodec::inputFrame(frame);
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}
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}
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/////////////////////////////////////////////////////////////////////////////////////
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AACRtmpEncoder::AACRtmpEncoder(const Track::Ptr &track) {
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_track = dynamic_pointer_cast<AACTrack>(track);
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}
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void AACRtmpEncoder::makeConfigPacket() {
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if (_track && _track->ready()) {
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//从track中和获取aac配置信息
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_aac_cfg = _track->getAacCfg();
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}
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if (!_aac_cfg.empty()) {
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makeAudioConfigPkt();
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}
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}
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void AACRtmpEncoder::inputFrame(const Frame::Ptr &frame) {
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if (_aac_cfg.empty()) {
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if (frame->prefixSize()) {
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//包含adts头,从adts头获取aac配置信息
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_aac_cfg = makeAacConfig((uint8_t *) (frame->data()), frame->prefixSize());
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}
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makeConfigPacket();
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}
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if(!_aac_cfg.empty()){
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auto rtmpPkt = RtmpPacket::create();
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//header
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uint8_t is_config = false;
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rtmpPkt->buffer.push_back(_audio_flv_flags);
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rtmpPkt->buffer.push_back(!is_config);
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//aac data
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rtmpPkt->buffer.append(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize());
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rtmpPkt->body_size = rtmpPkt->buffer.size();
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rtmpPkt->chunk_id = CHUNK_AUDIO;
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rtmpPkt->stream_index = STREAM_MEDIA;
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rtmpPkt->time_stamp = frame->dts();
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rtmpPkt->type_id = MSG_AUDIO;
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RtmpCodec::inputRtmp(rtmpPkt);
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}
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}
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void AACRtmpEncoder::makeAudioConfigPkt() {
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_audio_flv_flags = getAudioRtmpFlags(std::make_shared<AACTrack>(_aac_cfg));
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auto rtmpPkt = RtmpPacket::create();
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//header
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uint8_t is_config = true;
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rtmpPkt->buffer.push_back(_audio_flv_flags);
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rtmpPkt->buffer.push_back(!is_config);
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//aac config
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rtmpPkt->buffer.append(_aac_cfg);
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rtmpPkt->body_size = rtmpPkt->buffer.size();
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rtmpPkt->chunk_id = CHUNK_AUDIO;
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rtmpPkt->stream_index = STREAM_MEDIA;
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rtmpPkt->time_stamp = 0;
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rtmpPkt->type_id = MSG_AUDIO;
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RtmpCodec::inputRtmp(rtmpPkt);
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}
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}//namespace mediakit
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