FFmpeg
ffmpeg_cuvid.c
Go to the documentation of this file.
1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/hwcontext.h"
20 #include "libavutil/pixdesc.h"
21 
22 #include "ffmpeg.h"
23 
24 static void cuvid_uninit(AVCodecContext *avctx)
25 {
26  InputStream *ist = avctx->opaque;
28 }
29 
31 {
32  InputStream *ist = avctx->opaque;
33  AVHWFramesContext *frames_ctx;
34  int ret;
35 
36  av_log(avctx, AV_LOG_VERBOSE, "Initializing cuvid hwaccel\n");
37 
38  if (!hw_device_ctx) {
40  ist->hwaccel_device, NULL, 0);
41  if (ret < 0) {
42  av_log(avctx, AV_LOG_ERROR, "Error creating a CUDA device\n");
43  return ret;
44  }
45  }
46 
49  if (!ist->hw_frames_ctx) {
50  av_log(avctx, AV_LOG_ERROR, "Error creating a CUDA frames context\n");
51  return AVERROR(ENOMEM);
52  }
53 
54  frames_ctx = (AVHWFramesContext*)ist->hw_frames_ctx->data;
55 
56  frames_ctx->format = AV_PIX_FMT_CUDA;
57  frames_ctx->sw_format = avctx->sw_pix_fmt;
58  frames_ctx->width = avctx->width;
59  frames_ctx->height = avctx->height;
60 
61  av_log(avctx, AV_LOG_DEBUG, "Initializing CUDA frames context: sw_format = %s, width = %d, height = %d\n",
62  av_get_pix_fmt_name(frames_ctx->sw_format), frames_ctx->width, frames_ctx->height);
63 
65  if (ret < 0) {
66  av_log(avctx, AV_LOG_ERROR, "Error initializing a CUDA frame pool\n");
67  return ret;
68  }
69 
71 
72  return 0;
73 }
#define NULL
Definition: coverity.c:32
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:125
AVBufferRef * hw_frames_ctx
Definition: ffmpeg.h:376
int width
The allocated dimensions of the frames in this pool.
Definition: hwcontext.h:228
void(* hwaccel_uninit)(AVCodecContext *s)
Definition: ffmpeg.h:371
enum AVPixelFormat format
The pixel format identifying the underlying HW surface type.
Definition: hwcontext.h:208
int av_hwdevice_ctx_create(AVBufferRef **pdevice_ref, enum AVHWDeviceType type, const char *device, AVDictionary *opts, int flags)
Open a device of the specified type and create an AVHWDeviceContext for it.
Definition: hwcontext.c:571
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static AVBufferRef * hw_device_ctx
Definition: hw_decode.c:45
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int av_hwframe_ctx_init(AVBufferRef *ref)
Finalize the context before use.
Definition: hwcontext.c:329
int width
picture width / height.
Definition: avcodec.h:1738
HW acceleration through CUDA.
Definition: pixfmt.h:235
main external API structure.
Definition: avcodec.h:1565
uint8_t * data
The data buffer.
Definition: buffer.h:89
This struct describes a set or pool of "hardware" frames (i.e.
Definition: hwcontext.h:123
int cuvid_init(AVCodecContext *avctx)
Definition: ffmpeg_cuvid.c:30
AVBufferRef * av_hwframe_ctx_alloc(AVBufferRef *device_ref_in)
Allocate an AVHWFramesContext tied to a given device context.
Definition: hwcontext.c:243
char * hwaccel_device
Definition: ffmpeg.h:366
static void cuvid_uninit(AVCodecContext *avctx)
Definition: ffmpeg_cuvid.c:24
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2438
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
enum AVPixelFormat sw_format
The pixel format identifying the actual data layout of the hardware frames.
Definition: hwcontext.h:221
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:3112
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:1607