我在avcodec_send_packet中收到无效的参数错误

Question

在以下代码中：

int CplayerDlg::play()
{
    FILE *fp = fopen("video_files/1010.brf", "rb");
    ASSERT(fp);

    RecordFrame rf;
    RecordHeader hdr;
    ASSERT(fread(&rf, sizeof(rf), 1, fp) == 1);
    ASSERT(rf.frameType == FRAME_TYPE_HEADER);
    ASSERT(fread(&hdr, sizeof(hdr), 1, fp) == 1);
    GetDlgItem(IDC_DIM)->SetWindowText(format("%dx%d", hdr.width, hdr.height));
    GetDlgItem(IDC_CODEC_ID)->SetWindowText(format("%d", hdr.codecId));
    GetDlgItem(IDC_PIXEL_FORMAT)->SetWindowText(format("%d", hdr.pixelFormat));
    GetDlgItem(IDC_TIMEBASE)->SetWindowText(format("%d/%d", hdr.timebaseNum, hdr.timebaseDen));

    AVHWDeviceType type = av_hwdevice_find_type_by_name("dxva2");
    ASSERT(type != AV_HWDEVICE_TYPE_NONE);
    AVCodec *decoder = avcodec_find_decoder(AV_CODEC_ID_H264);
    ASSERT(decoder);
    for (int i = 0;; i++)
    {
        const AVCodecHWConfig *config = avcodec_get_hw_config(decoder, i);
        ASSERT(config);
        if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX &&
            config->device_type == type)
        {
            hw_pix_fmt = config->pix_fmt;
            break;
        }
    }
    AVCodecContext *decoder_ctx = avcodec_alloc_context3(decoder);
    ASSERT(decoder_ctx);
    decoder_ctx->get_format = get_hw_format;
    ASSERT(!av_hwdevice_ctx_create(&hw_device_ctx, type, NULL, NULL, 0));
    decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
    ASSERT(!avcodec_open2(decoder_ctx, decoder, NULL));
    AVPacket packet;
    av_init_packet(&packet);
    char buf[100000];
    AVFrame *frame = av_frame_alloc();
    ASSERT(frame);
    while (true)
    {
        ASSERT(fread(&rf, sizeof(rf), 1, fp) == 1);
        ASSERT(rf.frameType == FRAME_TYPE_STREAM);
        ASSERT(fread(buf, rf.frameSize, 1, fp) == 1);
        packet.data = (uint8_t *) buf;
        packet.size = rf.frameSize;
        packet.flags = rf.flags;
        packet.dts = packet.pts = rf.timestamp;
        ASSERT(!avcodec_send_packet(decoder_ctx, &packet));
        ASSERT(!avcodec_receive_frame(decoder_ctx, frame));
    }
    fclose(fp);
    av_frame_free(&frame);
    return 0;
}

我在avcodec_send_packet中收到错误-22。该文件的格式是自定义的，但是帧的格式与我以前从IP摄像机（H264）获得的格式相同。我从ffmpeg来源的hw_decode.c中启发了代码。我错过了什么？