Question

我使用libx264通过RTP传输视频捕获。现在，我只是流到本地主机。为了观看流，我使用ffmpeg库。当我将GOP大小设置为大于1（仅I帧）时，我会在接收方上收到伪像。奇怪的是，当我使用ffplay时，图像是完美的。我在做什么错了？

编码设置

output_codec_ctx->bit_rate = 5000000;
output_codec_ctx->width = 1920;
output_codec_ctx->height = 1080;
output_codec_ctx->time_base.den = 30; // frames per second
output_codec_ctx->time_base.num = 1;
output_codec_ctx->gop_size = 10; // gop size
output_codec_ctx->max_b_frames = 0; // B frames
output_codec_ctx->pix_fmt = AV_PIX_FMT_YUV420P; // output pixel format
output_codec_ctx->codec_type = AVMEDIA_TYPE_VIDEO;

av_opt_set(output_codec_ctx->priv_data, "preset", "ultrafast", 0);
av_opt_set(output_codec_ctx->priv_data, "tune", "zerolatency", 0);

解码代码

AVFormatContext *pFormatCtx;
AVCodecContext *input_codec_ctx;
AVCode *pCodec;
avdevice_register_all(); // for device
avformat_network_init();
pFormatCtx = avformat_alloc_context();
input_codec_ctx = avcodec_alloc_context3(nullptr);
AVDictionary *options = nullptr;
av_dict_set(&options, "protocol_whitelist", "file,udp,rtp", 0);
av_dict_set(&options, "fflags", "nobuffer",0);

avformat_open_input(&pFormatCtx, "rtp://127.0.0.1:49990", nullptr, &options);

avformat_find_stream_info(pFormatCtx, nullptr);
for (uint i = 0; i < pFormatCtx->nb_streams; i++)
 {
   if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
   {
     videoStream = static_cast<int>(i);
     break;
   }

 }

av_read_play(pFormatCtx);    //play stream
pCodec = avcodec_find_decoder(pFormatCtx->streams[videoStream]->codecpar->codec_id);
AVCodecParameters *codec_param = pFormatCtx->streams[videoStream]->codecpar;
avcodec_parameters_to_context(input_codec_ctx, codec_param);
avcodec_open2(input_codec_ctx, pCodec, nullptr);

AVPacket packet;
AVPacket *pkt  = &packet;
AVFrame *frame;
frame = av_frame_alloc();

av_init_packet(pkt);
pkt->data = nullptr;    // packet data will be allocated by the encoder
pkt->size = 0;

while(true){
    av_read_frame(pFormatCtx,pkt);
    avcodec_send_packet(input_codec_ctx,pkt);
    avcodec_receive_frame(input_codec_ctx,frame);
}

初始化和其他东西省略。用于自定义解码的控制台输出：

NULL @ 0x1fb7b80] Opening 'stream.sdp' for reading
[sdp @ 0x1fb7b80] Format sdp probed with size=2048 and score=50
[sdp @ 0x1fb7b80] video codec set to: h264
[sdp @ 0x1fb7b80] RTP Packetization Mode: 1
[udp @ 0x1f34140] end receive buffer size reported is 131072
[udp @ 0x1fb8e40] end receive buffer size reported is 131072
[sdp @ 0x1fb7b80] setting jitter buffer size to 500

 Success !
[sdp @ 0x1fb7b80] Before avformat_find_stream_info() pos: 181 bytes read:181 seeks:0 nb_streams:1
[AVBSFContext @ 0x1fa5880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[AVBSFContext @ 0x1fa5880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] Format yuv420p chosen by get_format().
[h264 @ 0x1fa51c0] Reinit context to 1920x1088, pix_fmt: yuv420p
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 57 packets
[h264 @ 0x1fa51c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] Invalid level prefix
[h264 @ 0x1fa51c0] error while decoding MB 2 36
[h264 @ 0x1fa51c0] concealing 3887 DC, 3887 AC, 3887 MV errors in I frame
[h264 @ 0x1fa51c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 155 packets
[h264 @ 0x1fa51c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] corrupted macroblock 32 41 (total_coeff=-1)
[h264 @ 0x1fa51c0] error while decoding MB 32 41
[h264 @ 0x1fa51c0] concealing 3257 DC, 3257 AC, 3257 MV errors in I frame
[h264 @ 0x1fa51c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1fa51c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 52 packets
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 51 packets
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 10 packets
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 50 packets
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 52 packets
[sdp @ 0x1fb7b80] All info found
[sdp @ 0x1fb7b80] After avformat_find_stream_info() pos: 181 bytes read:181 seeks:0 frames:28
found video stream 

The number of elements in stream is  1 

[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] Format yuv420p chosen by get_format().
[h264 @ 0x1ee3880] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 256 packets
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] Invalid level prefix
[h264 @ 0x1ee3880] error while decoding MB 119 41
[h264 @ 0x1ee3880] concealing 3170 DC, 3170 AC, 3170 MV errors in I frame
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 5 packets
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 4 packets
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] out of range intra chroma pred mode
[h264 @ 0x1ee3880] error while decoding MB 100 56
[h264 @ 0x1ee3880] corrupted macroblock 84 65 (total_coeff=-1)
[h264 @ 0x1ee3880] error while decoding MB 84 65
[h264 @ 0x1ee3880] concealing 754 DC, 754 AC, 754 MV errors in I frame
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 160 packets
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] corrupted macroblock 17 36 (total_coeff=-1)
[h264 @ 0x1ee3880] error while decoding MB 17 36
[h264 @ 0x1ee3880] concealing 3872 DC, 3872 AC, 3872 MV errors in I frame
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[sdp @ 0x1fb7b80] max delay reached. need to consume packet
[sdp @ 0x1fb7b80] RTP: missed 53 packets
[h264 @ 0x1ee3880] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x1ee3880] corrupted macroblock 62 39 (total_coeff=-1)
[h264 @ 0x1ee3880] error while decoding MB 62 39
[h264 @ 0x1ee3880] concealing 3467 DC, 3467 AC, 3467 MV errors in I frame

Answer 1

最后，我通过使用ffplay相同的方式来实现它来解决：一个线程执行av_read_frame（）并将接收到的数据包推送到一个数据包队列，另一个线程对这些数据包进行解码。

不知道为什么它不能在一个线程中工作。

您可能会从以下摘录中获得示例：

PacketReceiver：

[Fact]
    public async Task SendNotificationTest()
    {

        var clientId = "xxxx";
        var clientSecret = "yyyy";

        var alexaClient = clientId;
        var alexaSecret = clientSecret;

        var accessToken = new Alexa.NET.AccessTokenClient(Alexa.NET.AccessTokenClient.ApiDomainBaseAddress);
        var token = await accessToken.Send(alexaClient, alexaSecret);

        var reminder = new Reminder
        {
            RequestTime = DateTime.UtcNow,
            Trigger = new RelativeTrigger(12 * 60 * 60),
            AlertInformation = new AlertInformation(new[] { new SpokenContent("test", "en-GB") }),
            PushNotification = PushNotification.Disabled
        };

        var total = JsonConvert.SerializeObject(reminder);
        var client = new RemindersClient("https://api.eu.amazonalexa.com", token.Token);

        var alertList = await client.Get();

        foreach (var alertInformation in alertList.Alerts)
        {
            Console.WriteLine(alertInformation.ToString());
        }

        try
        {
            var response = await client.Create(reminder);
        }
        catch (Exception ex)
        {
            var x = ex.Message;
        }
    }

PacketQueue：

must_abort = false; // class member, externally set to true if abort requested
AVPacket packet;
AVPacket *pkt  = &packet;
int ret;

while (must_abort == false){
    ret = av_read_frame(pFormatCtx,pkt);
    if (ret>=0 && !must_abort){
        queue->putPacket(pkt);
    }
    else{
        qDebug("no packet received");
    }
    QApplication::processEvents();
}

解码器：

class PacketQueue{
public:
void init(){
    abort_request = false;
}
void putPacket(AVPacket *pkt) {

    mutex.lock();
    queue.enqueue(*pkt);
    waitForNewPacket.wakeAll();
    mutex.unlock();
}

int getPacket(AVPacket *pkt){
    int ret;
    mutex.lock();
    forever {
        if (abort_request) {
            ret = -1;
            break;
        }
        if (queue.size() == 0){
            if (waitForNewPacket.wait(&mutex, 1000)){
            }else{
                qDebug("PacketQueue timeout, try again...");
            }
            continue;
        }
        *pkt= queue.dequeue();
        ret = 1;
        break;
    }

    mutex.unlock();
    return ret;
}

void abort(){
    mutex.lock();
    abort_request = true;
    mutex.unlock();
}

bool abort_request;
QQueue<AVPacket> queue;
QMutex mutex;
QWaitCondition waitForNewPacket;
};

ffmpeg流解码-不使用ffplay时的伪像

1 个答案: