132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/*
|
|
* V4L2 buffer helper functions.
|
|
*
|
|
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
|
|
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef AVCODEC_V4L2_BUFFERS_H
|
|
#define AVCODEC_V4L2_BUFFERS_H
|
|
|
|
#include <stdatomic.h>
|
|
#include <linux/videodev2.h>
|
|
|
|
#include "avcodec.h"
|
|
|
|
enum V4L2Buffer_status {
|
|
V4L2BUF_AVAILABLE,
|
|
V4L2BUF_IN_DRIVER,
|
|
V4L2BUF_RET_USER,
|
|
};
|
|
|
|
/**
|
|
* V4L2Buffer (wrapper for v4l2_buffer management)
|
|
*/
|
|
typedef struct V4L2Buffer {
|
|
/* each buffer needs to have a reference to its context */
|
|
struct V4L2Context *context;
|
|
|
|
/* This object is refcounted per-plane, so we need to keep track
|
|
* of how many context-refs we are holding. */
|
|
AVBufferRef *context_ref;
|
|
atomic_uint context_refcount;
|
|
|
|
/* keep track of the mmap address and mmap length */
|
|
struct V4L2Plane_info {
|
|
int bytesperline;
|
|
void * mm_addr;
|
|
size_t length;
|
|
} plane_info[VIDEO_MAX_PLANES];
|
|
|
|
int num_planes;
|
|
|
|
/* the v4l2_buffer buf.m.planes pointer uses the planes[] mem */
|
|
struct v4l2_buffer buf;
|
|
struct v4l2_plane planes[VIDEO_MAX_PLANES];
|
|
|
|
int flags;
|
|
enum V4L2Buffer_status status;
|
|
|
|
} V4L2Buffer;
|
|
|
|
/**
|
|
* Extracts the data from a V4L2Buffer to an AVFrame
|
|
*
|
|
* @param[in] frame The AVFRame to push the information to
|
|
* @param[in] buf The V4L2Buffer to get the information from
|
|
*
|
|
* @returns 0 in case of success, AVERROR(EINVAL) if the number of planes is incorrect,
|
|
* AVERROR(ENOMEM) if the AVBufferRef can't be created.
|
|
*/
|
|
int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *buf);
|
|
|
|
/**
|
|
* Extracts the data from a V4L2Buffer to an AVPacket
|
|
*
|
|
* @param[in] pkt The AVPacket to push the information to
|
|
* @param[in] buf The V4L2Buffer to get the information from
|
|
*
|
|
* @returns 0 in case of success, AVERROR(EINVAL) if the number of planes is incorrect,
|
|
* AVERROR(ENOMEM) if the AVBufferRef can't be created.
|
|
*
|
|
*/
|
|
int ff_v4l2_buffer_buf_to_avpkt(AVPacket *pkt, V4L2Buffer *buf);
|
|
|
|
/**
|
|
* Extracts the data from an AVPacket to a V4L2Buffer
|
|
*
|
|
* @param[in] frame AVPacket to get the data from
|
|
* @param[in] avbuf V4L2Bfuffer to push the information to
|
|
*
|
|
* @returns 0 in case of success, a negative AVERROR code otherwise
|
|
*/
|
|
int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt, V4L2Buffer *out);
|
|
|
|
/**
|
|
* Extracts the data from an AVFrame to a V4L2Buffer
|
|
*
|
|
* @param[in] frame AVFrame to get the data from
|
|
* @param[in] avbuf V4L2Bfuffer to push the information to
|
|
*
|
|
* @returns 0 in case of success, a negative AVERROR code otherwise
|
|
*/
|
|
int ff_v4l2_buffer_avframe_to_buf(const AVFrame *frame, V4L2Buffer *out);
|
|
|
|
/**
|
|
* Initializes a V4L2Buffer
|
|
*
|
|
* @param[in] avbuf V4L2Bfuffer to initialize
|
|
* @param[in] index v4l2 buffer id
|
|
*
|
|
* @returns 0 in case of success, a negative AVERROR code otherwise
|
|
*/
|
|
int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index);
|
|
|
|
/**
|
|
* Enqueues a V4L2Buffer
|
|
*
|
|
* @param[in] avbuf V4L2Bfuffer to push to the driver
|
|
*
|
|
* @returns 0 in case of success, a negative AVERROR code otherwise
|
|
*/
|
|
int ff_v4l2_buffer_enqueue(V4L2Buffer* avbuf);
|
|
|
|
|
|
#endif // AVCODEC_V4L2_BUFFERS_H
|