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• Play mp3 data with audiotrack with ffmpeg

  1er février 2014, par Ichigo Kurosaki

  I am designing an android app where i receive live mp3 data as stream from Red5 server and i need to play it.

  I cant play it using media player class as i don't have any url for the stream, nor i cant use files. Another option is to use Audio track class, but requires PCM data only. So need to convert mp3 to pcm, so using ffmpeg.

  My code for conversion is

  AVCodec *codec;
  
  AVCodecContext *c= NULL;
  
  int out_size, len;
  
  uint8_t *outbuf;
  
  
  
  int iplen=(*env)->GetArrayLength(env, mp3buf);
  
  int16_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
  
  AVPacket avpkt;
  
  av_init_packet(&avpkt);
  
  av_register_all();
  
  avcodec_register_all();
  
  
  
  codec = avcodec_find_decoder(CODEC_ID_MP3);
  
  if(!codec){
  
      __android_log_print(ANDROID_LOG_DEBUG, "logfromjni", "Codec not found");
  
  }
  
  c = avcodec_alloc_context();
  
  outbuf = malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
  
  avpkt.data = (*env)->GetByteArrayElements(env,mp3buf,NULL);
  
  
  
  avpkt.size = (*env)->GetArrayLength(env, mp3buf);
  
  out_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
  
  int ao=avcodec_open(c, codec);
  
      if (ao < 0) {
  
          __android_log_print(ANDROID_LOG_DEBUG, "logfromjni", "avcodec not open");
  
      }
  
      len = avcodec_decode_audio3(c, (short *)outbuf, &out_size, &avpkt);

  The Problem is avcodec_decode_audio3(c, (short *)outbuf, &out_size, &avpkt); returns -1 always.

  Cant figure out whats wrong.

  Any help appreciated.

• How to pass data cuvidParseVideoData

  28 avril 2022, par Serhan Erkovan

  I try to develop streaming program,I have 4k videos that 5 fps and 20 seconds, I encode frames with cuda encoder successfully, i send encoded data over rtp successfully but when i try to decode that data, i got 0 frame from cuvidParseVideoData. Should i do something before the cuvidParseVideoData for example use ffmpeg demuxer ?

  


  RecvDec.cpp

  


  Server* server = new Server(8890 + thread_no);
server->recv_packets();
totBuf* totBuf = server->getTotalBuf();
            if (totBuf->perBuf == nullptr) {
                
                std::cout << prompt << "perBuf null!" << std::endl;
                nVideoBytes = 1;
                continue;
            }

pVideo = new uint8_t[totBuf->totSize];
memcpy(pVideo, totBuf->perBuf->perBuf, totBuf->totSize);
nVideoBytes = totBuf->perBuf->size;
int nFrameReturned = 0;
nFrameReturned = dec.Decode(pVideo, nVideoBytes);




  


  NvDecoder.cpp

  


  int NvDecoder::Decode(const uint8_t *pData, int nSize, int nFlags, int64_t nTimestamp)
{
    m_nDecodedFrame = 0;
    m_nDecodedFrameReturned = 0;
    CUVIDSOURCEDATAPACKET packet = { 0 };
    packet.payload = pData;
    packet.payload_size = nSize;
    packet.flags = nFlags | CUVID_PKT_TIMESTAMP;
    packet.timestamp = nTimestamp;
    if (!pData || nSize == 0) {
        packet.flags |= CUVID_PKT_ENDOFSTREAM;
    }
    NVDEC_API_CALL(cuvidParseVideoData(m_hParser, &packet));
    m_cuvidStream = 0;

    return m_nDecodedFrame;
}



  


  Decode function always returns 0.
If i have to pass my datas from Ffmpeg demuxer, how can i pass type of uint8_t* data to demuxer ?
My data always starts with 0x00 0x00 0x00 0x01. This is start frame tag.

  


• mpeg12dec : Export GOP timecodes as side data

  31 janvier 2016, par Derek Buitenhuis

  mpeg12dec : Export GOP timecodes as side data
  The codec context field was rightly deprecated, and the data
  
  may change per-frame.
  Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  

  • [DH] libavcodec/mpeg12dec.c