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0d7c452d84
There is no reason to enforce a high minimum. In the context of streaming only a few output buffers and capture buffers are even needed for continuous playback. This also helps alleviate memory pressure when decoding 4K media. Signed-off-by: Aman Karmani <aman@tmm1.net>
133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/*
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* V4L2 mem2mem 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_M2M_H
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#define AVCODEC_V4L2_M2M_H
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#include <semaphore.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <linux/videodev2.h>
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#include "libavcodec/avcodec.h"
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#include "v4l2_context.h"
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#define container_of(ptr, type, member) ({ \
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const __typeof__(((type *)0)->member ) *__mptr = (ptr); \
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(type *)((char *)__mptr - offsetof(type,member) );})
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#define V4L_M2M_DEFAULT_OPTS \
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{ "num_output_buffers", "Number of buffers in the output context",\
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OFFSET(num_output_buffers), AV_OPT_TYPE_INT, { .i64 = 16 }, 2, INT_MAX, FLAGS }
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typedef struct V4L2m2mContext {
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char devname[PATH_MAX];
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int fd;
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/* the codec context queues */
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V4L2Context capture;
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V4L2Context output;
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/* dynamic stream reconfig */
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AVCodecContext *avctx;
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sem_t refsync;
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atomic_uint refcount;
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int reinit;
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/* null frame/packet received */
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int draining;
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AVPacket buf_pkt;
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/* Reference to a frame. Only used during encoding */
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AVFrame *frame;
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/* Reference to self; only valid while codec is active. */
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AVBufferRef *self_ref;
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/* reference back to V4L2m2mPriv */
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void *priv;
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} V4L2m2mContext;
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typedef struct V4L2m2mPriv {
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AVClass *class;
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V4L2m2mContext *context;
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AVBufferRef *context_ref;
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int num_output_buffers;
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int num_capture_buffers;
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} V4L2m2mPriv;
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/**
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* Allocate a new context and references for a V4L2 M2M instance.
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*
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* @param[in] ctx The V4L2m2mPriv instantiated by the encoder/decoder.
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* @param[out] ctx The V4L2m2mContext.
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*
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* @returns 0 in success, a negative error code otherwise.
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*/
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int ff_v4l2_m2m_create_context(V4L2m2mPriv *priv, V4L2m2mContext **s);
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/**
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* Probes the video nodes looking for the required codec capabilities.
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*
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* @param[in] ctx The V4L2m2mPriv instantiated by the encoder/decoder.
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*
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* @returns 0 if a driver is found, a negative number otherwise.
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*/
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int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv);
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/**
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* Releases all the codec resources if all AVBufferRefs have been returned to the
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* ctx. Otherwise keep the driver open.
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*
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* @param[in] The V4L2m2mPriv instantiated by the encoder/decoder.
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*
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* @returns 0
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*
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*/
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int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv);
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/**
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* Reinitializes the V4L2m2mContext when the driver cannot continue processing
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* with the capture parameters.
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*
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* @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
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*
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* @returns 0 in case of success, negative number otherwise
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*/
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int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *ctx);
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/**
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* Reinitializes the V4L2m2mContext when the driver cannot continue processing
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* with the any of the current V4L2Contexts (ie, changes in output and capture).
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*
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* @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
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*
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* @returns 0 in case of success, negative number otherwise
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*/
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int ff_v4l2_m2m_codec_full_reinit(V4L2m2mContext *ctx);
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#endif /* AVCODEC_V4L2_M2M_H */
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