2016-06-05 21:58 GMT+03:00 Timo Rothenpieler <t...@rothenpieler.org>:
> + /* check if the decoder supports CUVID and the output only goes to
> this stream */
> + if (ist->nb_filters || ist->hwaccel_id != HWACCEL_CUVID || !ist->dec
> || !ist->dec->pix_fmts)
> + goto cancel;
> + for (pix_fmt = ist->dec->pix_fmts; *pix_fmt != AV_PIX_FMT_NONE;
> pix_fmt++)
> + if (*pix_fmt == AV_PIX_FMT_CUDA)
> + break;
> + if (*pix_fmt == AV_PIX_FMT_NONE)
> + goto cancel;
> +
> + for (i = 0; i < nb_output_streams; i++)
> + if (output_streams[i] != ost && output_streams[i]->source_index
> == ost->source_index)
> + goto cancel;
>
Is it possible to enhance this to support 1-to-N transcoding (usecase
solved by NVidia's patch with nvresize)? One can do the same with complex
filtergraph with several scale_npp instances. This seems like a bit of
over-restriction.
+ err = cuInit(0);
> + if (err != CUDA_SUCCESS) {
> + av_log(NULL, AV_LOG_ERROR, "Could not initialize the CUDA driver
> API\n");
> + ret = AVERROR_UNKNOWN;
> + goto error;
> + }
> +
> + err = cuDeviceGet(&device, 0); ///TODO: Make device index configurable
> + if (err != CUDA_SUCCESS) {
> + av_log(NULL, AV_LOG_ERROR, "Could not get the device number
> %d\n", 0);
> + ret = AVERROR_UNKNOWN;
> + goto error;
> + }
> +
> + err = cuCtxCreate(&cuda_ctx, CU_CTX_SCHED_BLOCKING_SYNC, device);
> + if (err != CUDA_SUCCESS) {
> + av_log(NULL, AV_LOG_ERROR, "Error creating a CUDA context\n");
> + ret = AVERROR_UNKNOWN;
> + goto error;
> + }
> +
> + device_ctx = (AVHWDeviceContext*)hw_device_ctx->data;
> + device_ctx->free = cuvid_ctx_free;
> +
> + device_hwctx = device_ctx->hwctx;
> + device_hwctx->cuda_ctx = cuda_ctx;
> +
> + err = cuCtxPopCurrent(&dummy);
> + if (err != CUDA_SUCCESS) {
> + av_log(NULL, AV_LOG_ERROR, "cuCtxPopCurrent failed\n");
> + ret = AVERROR_UNKNOWN;
> + goto error;
> + }
> +
It begs to merge in device_create functionality from libav
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