90124e1139
Probe all media devices and its linked video devices to locate a video device that support stateless decoding of the specific codec using the V4L2 Request API. When AVV4L2RequestDeviceContext.media_fd is a valid file descriptor only video devices for the opened media device is probed. E.g. using a -init_hw_device v4l2request:/dev/media1 parameter. A video device is deemed capable when all tests pass, e.g. kernel driver support the codec, FFmpeg v4l2-request code know about the buffer format and kernel driver report that the frame size is supported. A codec specific hook, post_probe, is supported to e.g. test for codec specific limitations, PROFILE and LEVEL controls. Basic flow for initialization follow the kernel Memory-to-memory Stateless Video Decoder Interface > Initialization [1]. [1] https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-stateless-decoder.html#initialization Co-developed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com> Co-developed-by: Alex Bee <knaerzche@gmail.com> Signed-off-by: Alex Bee <knaerzche@gmail.com> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_V4L2_REQUEST_INTERNAL_H
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#define AVCODEC_V4L2_REQUEST_INTERNAL_H
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#include <linux/media.h>
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#include "internal.h"
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#include "v4l2_request.h"
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typedef struct V4L2RequestFrameDescriptor {
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AVDRMFrameDescriptor base;
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V4L2RequestBuffer capture;
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} V4L2RequestFrameDescriptor;
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static inline V4L2RequestContext *v4l2_request_context(AVCodecContext *avctx)
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{
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return (V4L2RequestContext *)avctx->internal->hwaccel_priv_data;
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}
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static inline V4L2RequestFrameDescriptor *v4l2_request_framedesc(AVFrame *frame)
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{
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return (V4L2RequestFrameDescriptor *)frame->data[0];
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}
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enum AVPixelFormat ff_v4l2_request_get_sw_format(struct v4l2_format *format);
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int ff_v4l2_request_set_drm_descriptor(V4L2RequestFrameDescriptor *framedesc,
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struct v4l2_format *format);
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int ff_v4l2_request_probe(AVCodecContext *avctx, uint32_t pixelformat,
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uint32_t buffersize, struct v4l2_ext_control *control,
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int count);
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#endif /* AVCODEC_V4L2_REQUEST_INTERNAL_H */
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