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https://github.com/FFmpeg/FFmpeg.git
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f18de5bc4a
Avoids allocations and therefore error checks; also avoids indirections and allows to remove the boilerplate code for creating an object with a dedicated free function. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* V4L2 buffer helper functions.
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*
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* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
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* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
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*
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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_BUFFERS_H
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#define AVCODEC_V4L2_BUFFERS_H
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#include <stdatomic.h>
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#include <stddef.h>
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#include <linux/videodev2.h>
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#include "libavutil/frame.h"
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#include "packet.h"
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enum V4L2Buffer_status {
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V4L2BUF_AVAILABLE,
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V4L2BUF_IN_DRIVER,
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V4L2BUF_RET_USER,
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};
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/**
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* V4L2Buffer (wrapper for v4l2_buffer management)
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*/
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typedef struct V4L2Buffer {
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/* each buffer needs to have a reference to its context */
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struct V4L2Context *context;
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/* This object is refcounted per-plane, so we need to keep track
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* of how many context-refs we are holding.
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* This pointer is a RefStruct reference. */
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const struct V4L2m2mContext *context_ref;
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atomic_uint context_refcount;
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/* keep track of the mmap address and mmap length */
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struct V4L2Plane_info {
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int bytesperline;
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void * mm_addr;
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size_t length;
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} plane_info[VIDEO_MAX_PLANES];
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int num_planes;
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/* the v4l2_buffer buf.m.planes pointer uses the planes[] mem */
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struct v4l2_buffer buf;
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struct v4l2_plane planes[VIDEO_MAX_PLANES];
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int flags;
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enum V4L2Buffer_status status;
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} V4L2Buffer;
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/**
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* Extracts the data from a V4L2Buffer to an AVFrame
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*
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* @param[in] frame The AVFRame to push the information to
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* @param[in] buf The V4L2Buffer to get the information from
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*
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* @returns 0 in case of success, AVERROR(EINVAL) if the number of planes is incorrect,
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* AVERROR(ENOMEM) if the AVBufferRef can't be created.
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*/
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int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *buf);
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/**
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* Extracts the data from a V4L2Buffer to an AVPacket
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*
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* @param[in] pkt The AVPacket to push the information to
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* @param[in] buf The V4L2Buffer to get the information from
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*
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* @returns 0 in case of success, AVERROR(EINVAL) if the number of planes is incorrect,
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* AVERROR(ENOMEM) if the AVBufferRef can't be created.
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*
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*/
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int ff_v4l2_buffer_buf_to_avpkt(AVPacket *pkt, V4L2Buffer *buf);
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/**
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* Extracts the data from an AVPacket to a V4L2Buffer
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*
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* @param[in] frame AVPacket to get the data from
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* @param[in] avbuf V4L2Bfuffer to push the information to
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*
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* @returns 0 in case of success, a negative AVERROR code otherwise
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*/
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int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt, V4L2Buffer *out);
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/**
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* Extracts the data from an AVFrame to a V4L2Buffer
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*
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* @param[in] frame AVFrame to get the data from
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* @param[in] avbuf V4L2Bfuffer to push the information to
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*
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* @returns 0 in case of success, a negative AVERROR code otherwise
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*/
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int ff_v4l2_buffer_avframe_to_buf(const AVFrame *frame, V4L2Buffer *out);
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/**
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* Initializes a V4L2Buffer
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*
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* @param[in] avbuf V4L2Bfuffer to initialize
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* @param[in] index v4l2 buffer id
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*
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* @returns 0 in case of success, a negative AVERROR code otherwise
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*/
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int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index);
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/**
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* Enqueues a V4L2Buffer
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*
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* @param[in] avbuf V4L2Bfuffer to push to the driver
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*
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* @returns 0 in case of success, a negative AVERROR code otherwise
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*/
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int ff_v4l2_buffer_enqueue(V4L2Buffer* avbuf);
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#endif // AVCODEC_V4L2_BUFFERS_H
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