2 * V4L2 buffer helper functions.
4 * Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
5 * Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #ifndef AVCODEC_V4L2_BUFFERS_H
25 #define AVCODEC_V4L2_BUFFERS_H
27 #include <linux/videodev2.h>
29 enum V4L2Buffer_status {
36 * V4L2Buffer (wrapper for v4l2_buffer management)
38 typedef struct V4L2Buffer {
39 /* each buffer needs to have a reference to its context */
40 struct V4L2Context *context;
42 /* keep track of the mmap address and mmap length */
43 struct V4L2Plane_info {
47 } plane_info[VIDEO_MAX_PLANES];
51 /* the v4l2_buffer buf.m.planes pointer uses the planes[] mem */
52 struct v4l2_buffer buf;
53 struct v4l2_plane planes[VIDEO_MAX_PLANES];
56 enum V4L2Buffer_status status;
61 * Extracts the data from a V4L2Buffer to an AVFrame
63 * @param[in] frame The AVFRame to push the information to
64 * @param[in] buf The V4L2Buffer to get the information from
66 * @returns 0 in case of success, EINVAL if the number of planes is incorrect,
67 * ENOMEM if the AVBufferRef cant be created.
69 int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *buf);
72 * Extracts the data from a V4L2Buffer to an AVPacket
74 * @param[in] pkt The AVPacket to push the information to
75 * @param[in] buf The V4L2Buffer to get the information from
77 * @returns 0 in case of success, EINVAL if the number of planes is incorrect,
78 * ENOMEM if the AVBufferRef cant be created.
81 int ff_v4l2_buffer_buf_to_avpkt(AVPacket *pkt, V4L2Buffer *buf);
84 * Extracts the data from an AVPacket to a V4L2Buffer
86 * @param[in] frame AVPacket to get the data from
87 * @param[in] avbuf V4L2Bfuffer to push the information to
89 * @returns 0 in case of success, negative otherwise
91 int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt, V4L2Buffer *out);
94 * Extracts the data from an AVFrame to a V4L2Buffer
96 * @param[in] frame AVFrame to get the data from
97 * @param[in] avbuf V4L2Bfuffer to push the information to
99 * @returns 0 in case of success, negative otherwise
101 int ff_v4l2_buffer_avframe_to_buf(const AVFrame *frame, V4L2Buffer* out);
104 * Initializes a V4L2Buffer
106 * @param[in] avbuf V4L2Bfuffer to initialize
107 * @param[in] index v4l2 buffer id
109 * @returns 0 in case of success, negative otherwise
111 int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index);
114 * Enqueues a V4L2Buffer
116 * @param[in] avbuf V4L2Bfuffer to push to the driver
118 * @returns 0 in case of success, negative otherwise
120 int ff_v4l2_buffer_enqueue(V4L2Buffer* avbuf);
123 #endif // AVCODEC_V4L2_BUFFERS_H