mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 01:42:20 +00:00
a0c624e299
Refcount all of the context information. This also fixes a potential segmentation fault when accessing freed memory (buffer returned after the codec has been closed). Tested-by: Jorge Ramirez-Ortiz <jorge.ramirez.ortiz@gmail.com>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
|
|
* V4L2 mem2mem 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_M2M_H
|
|
#define AVCODEC_V4L2_M2M_H
|
|
|
|
#include <semaphore.h>
|
|
#include <unistd.h>
|
|
#include <dirent.h>
|
|
#include <linux/videodev2.h>
|
|
|
|
#include "libavcodec/avcodec.h"
|
|
#include "v4l2_context.h"
|
|
|
|
#define container_of(ptr, type, member) ({ \
|
|
const __typeof__(((type *)0)->member ) *__mptr = (ptr); \
|
|
(type *)((char *)__mptr - offsetof(type,member) );})
|
|
|
|
#define V4L_M2M_DEFAULT_OPTS \
|
|
{ "num_output_buffers", "Number of buffers in the output context",\
|
|
OFFSET(num_output_buffers), AV_OPT_TYPE_INT, { .i64 = 16 }, 6, INT_MAX, FLAGS }
|
|
|
|
typedef struct V4L2m2mContext {
|
|
char devname[PATH_MAX];
|
|
int fd;
|
|
|
|
/* the codec context queues */
|
|
V4L2Context capture;
|
|
V4L2Context output;
|
|
|
|
/* dynamic stream reconfig */
|
|
AVCodecContext *avctx;
|
|
sem_t refsync;
|
|
atomic_uint refcount;
|
|
int reinit;
|
|
|
|
/* null frame/packet received */
|
|
int draining;
|
|
|
|
/* Reference to self; only valid while codec is active. */
|
|
AVBufferRef *self_ref;
|
|
} V4L2m2mContext;
|
|
|
|
typedef struct V4L2m2mPriv
|
|
{
|
|
AVClass *class;
|
|
|
|
V4L2m2mContext *context;
|
|
AVBufferRef *context_ref;
|
|
|
|
int num_output_buffers;
|
|
int num_capture_buffers;
|
|
} V4L2m2mPriv;
|
|
|
|
/**
|
|
* Allocate a new context and references for a V4L2 M2M instance.
|
|
*
|
|
* @param[in] ctx The AVCodecContext instantiated by the encoder/decoder.
|
|
* @param[out] ctx The V4L2m2mContext.
|
|
*
|
|
* @returns 0 in success, a negative error code otherwise.
|
|
*/
|
|
int ff_v4l2_m2m_create_context(AVCodecContext *avctx, V4L2m2mContext **s);
|
|
|
|
|
|
/**
|
|
* Probes the video nodes looking for the required codec capabilities.
|
|
*
|
|
* @param[in] ctx The AVCodecContext instantiated by the encoder/decoder.
|
|
*
|
|
* @returns 0 if a driver is found, a negative number otherwise.
|
|
*/
|
|
int ff_v4l2_m2m_codec_init(AVCodecContext *avctx);
|
|
|
|
/**
|
|
* Releases all the codec resources if all AVBufferRefs have been returned to the
|
|
* ctx. Otherwise keep the driver open.
|
|
*
|
|
* @param[in] The AVCodecContext instantiated by the encoder/decoder.
|
|
*
|
|
* @returns 0
|
|
*
|
|
*/
|
|
int ff_v4l2_m2m_codec_end(AVCodecContext *avctx);
|
|
|
|
/**
|
|
* Reinitializes the V4L2m2mContext when the driver cant continue processing
|
|
* with the capture parameters.
|
|
*
|
|
* @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
|
|
*
|
|
* @returns 0 in case of success, negative number otherwise
|
|
*/
|
|
int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *ctx);
|
|
|
|
/**
|
|
* Reinitializes the V4L2m2mContext when the driver cant continue processing
|
|
* with the any of the current V4L2Contexts (ie, changes in output and capture).
|
|
*
|
|
* @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
|
|
*
|
|
* @returns 0 in case of success, negative number otherwise
|
|
*/
|
|
int ff_v4l2_m2m_codec_full_reinit(V4L2m2mContext *ctx);
|
|
|
|
#endif /* AVCODEC_V4L2_M2M_H */
|