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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/hwcontext.h"
#include "ffmpeg.h"
typedef struct CUVIDContext {
AVBufferRef *hw_frames_ctx;
} CUVIDContext;
static void cuvid_uninit(AVCodecContext *avctx)
{
InputStream *ist = avctx->opaque;
CUVIDContext *ctx = ist->hwaccel_ctx;
if (ctx) {
av_buffer_unref(&ctx->hw_frames_ctx);
av_freep(&ctx);
}
av_buffer_unref(&ist->hw_frames_ctx);
ist->hwaccel_ctx = 0;
ist->hwaccel_uninit = 0;
}
int cuvid_init(AVCodecContext *avctx)
{
InputStream *ist = avctx->opaque;
CUVIDContext *ctx = ist->hwaccel_ctx;
av_log(NULL, AV_LOG_TRACE, "Initializing cuvid hwaccel\n");
if (!ctx) {
av_log(NULL, AV_LOG_ERROR, "CUVID transcoding is not initialized. "
"-hwaccel cuvid should only be used for one-to-one CUVID transcoding "
"with no (software) filters.\n");
return AVERROR(EINVAL);
}
return 0;
}
int cuvid_transcode_init(OutputStream *ost)
{
InputStream *ist;
const enum AVPixelFormat *pix_fmt;
AVHWFramesContext *hwframe_ctx;
AVBufferRef *device_ref = NULL;
CUVIDContext *ctx = NULL;
int ret = 0;
av_log(NULL, AV_LOG_TRACE, "Initializing cuvid transcoding\n");
if (ost->source_index < 0)
return 0;
ist = input_streams[ost->source_index];
/* check if the encoder supports CUVID */
if (!ost->enc->pix_fmts)
goto cancel;
for (pix_fmt = ost->enc->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;
/* check if the decoder supports CUVID */
if (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;
av_log(NULL, AV_LOG_VERBOSE, "Setting up CUVID transcoding\n");
if (ist->hwaccel_ctx) {
ctx = ist->hwaccel_ctx;
} else {
ctx = av_mallocz(sizeof(*ctx));
if (!ctx) {
ret = AVERROR(ENOMEM);
goto error;
}
}
if (!ctx->hw_frames_ctx) {
ret = av_hwdevice_ctx_create(&device_ref, AV_HWDEVICE_TYPE_CUDA,
ist->hwaccel_device, NULL, 0);
if (ret < 0)
goto error;
ctx->hw_frames_ctx = av_hwframe_ctx_alloc(device_ref);
if (!ctx->hw_frames_ctx) {
av_log(NULL, AV_LOG_ERROR, "av_hwframe_ctx_alloc failed\n");
ret = AVERROR(ENOMEM);
goto error;
}
av_buffer_unref(&device_ref);
ist->hw_frames_ctx = av_buffer_ref(ctx->hw_frames_ctx);
if (!ist->hw_frames_ctx) {
av_log(NULL, AV_LOG_ERROR, "av_buffer_ref failed\n");
ret = AVERROR(ENOMEM);
goto error;
}
ist->hwaccel_ctx = ctx;
ist->resample_pix_fmt = AV_PIX_FMT_CUDA;
ist->hwaccel_uninit = cuvid_uninit;
/* This is a bit hacky, av_hwframe_ctx_init is called by the cuvid decoder
* once it has probed the necessary format information. But as filters/nvenc
* need to know the format/sw_format, set them here so they are happy.
* This is fine as long as CUVID doesn't add another supported pix_fmt.
*/
hwframe_ctx = (AVHWFramesContext*)ctx->hw_frames_ctx->data;
hwframe_ctx->format = AV_PIX_FMT_CUDA;
hwframe_ctx->sw_format = AV_PIX_FMT_NV12;
}
return 0;
error:
av_freep(&ctx);
av_buffer_unref(&device_ref);
return ret;
cancel:
if (ist->hwaccel_id == HWACCEL_CUVID) {
av_log(NULL, AV_LOG_ERROR, "CUVID hwaccel requested, but impossible to achieve.\n");
return AVERROR(EINVAL);
}
return 0;
}
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