完成AAC RTMP编解码类

src/RtmpCodec/AACRtmpCodec.cpp

@@ -0,0 +1,122 @@
+//
+// Created by xzl on 2018/10/24.
+//
+
+#include <Player/Player.h>
+#include "AACRtmpCodec.h"
+
+namespace ZL{
+namespace Rtmp {
+
+AACRtmpDecoder::AACRtmpDecoder() {
+    _adts = obtainFrame();
+}
+
+AACFrame::Ptr AACRtmpDecoder::obtainFrame() {
+    //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
+    auto frame = ResourcePoolHelper<AACFrame>::obtainObj();
+    frame->aac_frame_length = 7;
+    frame->iPrefixSize = 7;
+    return frame;
+}
+
+bool AACRtmpDecoder::inputRtmp(const RtmpPacket::Ptr &pkt, bool key_pos) {
+    RtmpCodec::inputRtmp(pkt, false);
+
+    if (pkt->isCfgFrame()) {
+        _aac_cfg = pkt->getAacCfg();
+        return false;
+    }
+    if (!_aac_cfg.empty()) {
+        onGetAAC(pkt->strBuf.data() + 2, pkt->strBuf.size() - 2, pkt->timeStamp);
+    }
+    return false;
+}
+
+void AACRtmpDecoder::onGetAAC(const char* pcData, int iLen, uint32_t ui32TimeStamp) {
+    if(iLen + 7 > sizeof(_adts->buffer)){
+        WarnL << "Illegal adts data, exceeding the length limit.";
+        return;
+    }
+    //写adts结构头
+    makeAdtsHeader(_aac_cfg,*_adts);
+
+    //拷贝aac负载
+    memcpy(_adts->buffer + 7, pcData, iLen);
+    _adts->aac_frame_length = 7 + iLen;
+    _adts->timeStamp = ui32TimeStamp;
+
+    //adts结构头转成头7个字节
+    writeAdtsHeader(*_adts, _adts->buffer);
+
+    //写入环形缓存
+    RtmpCodec::inputFrame(_adts);
+    _adts = obtainFrame();
+}
+/////////////////////////////////////////////////////////////////////////////////////
+
+void AACRtmpEncoder::inputFrame(const Frame::Ptr &frame) {
+    RtmpCodec::inputFrame(frame);
+    if(frame->prefixSize() == 7 && _aac_cfg.empty()){
+        //包含adts头
+        _aac_cfg = makeAdtsConfig(reinterpret_cast<const uint8_t *>(frame->data()));
+        makeAudioConfigPkt();
+    }
+}
+
+void AACRtmpEncoder::makeAudioConfigPkt() {
+    makeAdtsHeader(_aac_cfg,*_adts);
+    int iSampleRate , iChannel , iSampleBit = 16;
+    getAACInfo(*_adts,iSampleRate,iChannel);
+
+    uint8_t flvStereoOrMono = (iChannel > 1);
+    uint8_t flvSampleRate;
+    switch (iSampleRate) {
+        case 48000:
+        case 44100:
+            flvSampleRate = 3;
+            break;
+        case 24000:
+        case 22050:
+            flvSampleRate = 2;
+            break;
+        case 12000:
+        case 11025:
+            flvSampleRate = 1;
+            break;
+        default:
+            flvSampleRate = 0;
+            break;
+    }
+    uint8_t flvSampleBit = iSampleBit == 16;
+    uint8_t flvAudioType = 10; //aac
+
+    uint8_t m_ui8AudioFlags = (flvAudioType << 4) | (flvSampleRate << 2) | (flvSampleBit << 1) | flvStereoOrMono;
+
+    RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
+    //////////header
+    uint8_t is_config = true;
+    rtmpPkt->strBuf.push_back(m_ui8AudioFlags);
+    rtmpPkt->strBuf.push_back(!is_config);
+    rtmpPkt->strBuf.append(_aac_cfg);
+
+    rtmpPkt->bodySize = rtmpPkt->strBuf.size();
+    rtmpPkt->chunkId = CHUNK_AUDIO;
+    rtmpPkt->streamId = STREAM_MEDIA;
+    rtmpPkt->timeStamp = 0;
+    rtmpPkt->typeId = MSG_AUDIO;
+    inputRtmp(rtmpPkt, true);
+}
+
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+}//namespace Rtmp
+}//namespace ZL