1 |
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/* |
2 |
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* V4L mem2mem |
3 |
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* |
4 |
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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. |
8 |
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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 |
11 |
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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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#include <linux/videodev2.h> |
25 |
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#include <sys/ioctl.h> |
26 |
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#include <sys/mman.h> |
27 |
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#include <unistd.h> |
28 |
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#include <dirent.h> |
29 |
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#include <fcntl.h> |
30 |
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#include "libavcodec/avcodec.h" |
31 |
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#include "libavcodec/internal.h" |
32 |
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#include "libavutil/pixdesc.h" |
33 |
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#include "libavutil/imgutils.h" |
34 |
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#include "libavutil/pixfmt.h" |
35 |
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#include "v4l2_context.h" |
36 |
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#include "v4l2_fmt.h" |
37 |
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#include "v4l2_m2m.h" |
38 |
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39 |
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static inline int v4l2_splane_video(struct v4l2_capability *cap) |
40 |
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{ |
41 |
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if (cap->capabilities & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT) && |
42 |
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cap->capabilities & V4L2_CAP_STREAMING) |
43 |
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return 1; |
44 |
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45 |
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if (cap->capabilities & V4L2_CAP_VIDEO_M2M) |
46 |
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return 1; |
47 |
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48 |
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return 0; |
49 |
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} |
50 |
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51 |
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static inline int v4l2_mplane_video(struct v4l2_capability *cap) |
52 |
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{ |
53 |
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if (cap->capabilities & (V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_OUTPUT_MPLANE) && |
54 |
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cap->capabilities & V4L2_CAP_STREAMING) |
55 |
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return 1; |
56 |
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57 |
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if (cap->capabilities & V4L2_CAP_VIDEO_M2M_MPLANE) |
58 |
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return 1; |
59 |
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60 |
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return 0; |
61 |
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} |
62 |
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63 |
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static int v4l2_prepare_contexts(V4L2m2mContext *s, int probe) |
64 |
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{ |
65 |
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struct v4l2_capability cap; |
66 |
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void *log_ctx = s->avctx; |
67 |
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int ret; |
68 |
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69 |
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s->capture.done = s->output.done = 0; |
70 |
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s->capture.name = "capture"; |
71 |
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s->output.name = "output"; |
72 |
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atomic_init(&s->refcount, 0); |
73 |
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sem_init(&s->refsync, 0, 0); |
74 |
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75 |
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memset(&cap, 0, sizeof(cap)); |
76 |
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ret = ioctl(s->fd, VIDIOC_QUERYCAP, &cap); |
77 |
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if (ret < 0) |
78 |
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return ret; |
79 |
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80 |
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av_log(log_ctx, probe ? AV_LOG_DEBUG : AV_LOG_INFO, |
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"driver '%s' on card '%s' in %s mode\n", cap.driver, cap.card, |
82 |
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v4l2_mplane_video(&cap) ? "mplane" : |
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v4l2_splane_video(&cap) ? "splane" : "unknown"); |
84 |
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85 |
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if (v4l2_mplane_video(&cap)) { |
86 |
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s->capture.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; |
87 |
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s->output.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE; |
88 |
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return 0; |
89 |
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} |
90 |
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91 |
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if (v4l2_splane_video(&cap)) { |
92 |
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s->capture.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
93 |
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s->output.type = V4L2_BUF_TYPE_VIDEO_OUTPUT; |
94 |
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return 0; |
95 |
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} |
96 |
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97 |
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return AVERROR(EINVAL); |
98 |
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} |
99 |
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100 |
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static int v4l2_probe_driver(V4L2m2mContext *s) |
101 |
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{ |
102 |
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void *log_ctx = s->avctx; |
103 |
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int ret; |
104 |
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105 |
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s->fd = open(s->devname, O_RDWR | O_NONBLOCK, 0); |
106 |
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if (s->fd < 0) |
107 |
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return AVERROR(errno); |
108 |
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109 |
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ret = v4l2_prepare_contexts(s, 1); |
110 |
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if (ret < 0) |
111 |
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goto done; |
112 |
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113 |
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ret = ff_v4l2_context_get_format(&s->output, 1); |
114 |
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if (ret) { |
115 |
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av_log(log_ctx, AV_LOG_DEBUG, "v4l2 output format not supported\n"); |
116 |
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goto done; |
117 |
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} |
118 |
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119 |
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ret = ff_v4l2_context_get_format(&s->capture, 1); |
120 |
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if (ret) { |
121 |
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av_log(log_ctx, AV_LOG_DEBUG, "v4l2 capture format not supported\n"); |
122 |
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goto done; |
123 |
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} |
124 |
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125 |
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done: |
126 |
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if (close(s->fd) < 0) { |
127 |
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ret = AVERROR(errno); |
128 |
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av_log(log_ctx, AV_LOG_ERROR, "failure closing %s (%s)\n", s->devname, av_err2str(AVERROR(errno))); |
129 |
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} |
130 |
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131 |
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s->fd = -1; |
132 |
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133 |
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return ret; |
134 |
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} |
135 |
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136 |
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static int v4l2_configure_contexts(V4L2m2mContext *s) |
137 |
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{ |
138 |
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void *log_ctx = s->avctx; |
139 |
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int ret; |
140 |
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struct v4l2_format ofmt, cfmt; |
141 |
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142 |
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s->fd = open(s->devname, O_RDWR | O_NONBLOCK, 0); |
143 |
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if (s->fd < 0) |
144 |
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return AVERROR(errno); |
145 |
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146 |
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ret = v4l2_prepare_contexts(s, 0); |
147 |
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if (ret < 0) |
148 |
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goto error; |
149 |
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150 |
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ofmt = s->output.format; |
151 |
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cfmt = s->capture.format; |
152 |
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av_log(log_ctx, AV_LOG_INFO, "requesting formats: output=%s capture=%s\n", |
153 |
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av_fourcc2str(V4L2_TYPE_IS_MULTIPLANAR(ofmt.type) ? |
154 |
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ofmt.fmt.pix_mp.pixelformat : |
155 |
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ofmt.fmt.pix.pixelformat), |
156 |
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av_fourcc2str(V4L2_TYPE_IS_MULTIPLANAR(cfmt.type) ? |
157 |
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cfmt.fmt.pix_mp.pixelformat : |
158 |
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cfmt.fmt.pix.pixelformat)); |
159 |
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160 |
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ret = ff_v4l2_context_set_format(&s->output); |
161 |
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if (ret) { |
162 |
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av_log(log_ctx, AV_LOG_ERROR, "can't set v4l2 output format\n"); |
163 |
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goto error; |
164 |
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} |
165 |
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166 |
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ret = ff_v4l2_context_set_format(&s->capture); |
167 |
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if (ret) { |
168 |
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av_log(log_ctx, AV_LOG_ERROR, "can't to set v4l2 capture format\n"); |
169 |
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goto error; |
170 |
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} |
171 |
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172 |
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ret = ff_v4l2_context_init(&s->output); |
173 |
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if (ret) { |
174 |
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av_log(log_ctx, AV_LOG_ERROR, "no v4l2 output context's buffers\n"); |
175 |
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goto error; |
176 |
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} |
177 |
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178 |
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/* decoder's buffers need to be updated at a later stage */ |
179 |
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if (s->avctx && !av_codec_is_decoder(s->avctx->codec)) { |
180 |
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ret = ff_v4l2_context_init(&s->capture); |
181 |
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if (ret) { |
182 |
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av_log(log_ctx, AV_LOG_ERROR, "no v4l2 capture context's buffers\n"); |
183 |
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goto error; |
184 |
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} |
185 |
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} |
186 |
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187 |
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return 0; |
188 |
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189 |
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error: |
190 |
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if (close(s->fd) < 0) { |
191 |
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ret = AVERROR(errno); |
192 |
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av_log(log_ctx, AV_LOG_ERROR, "error closing %s (%s)\n", |
193 |
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s->devname, av_err2str(AVERROR(errno))); |
194 |
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} |
195 |
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s->fd = -1; |
196 |
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197 |
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return ret; |
198 |
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} |
199 |
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200 |
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/****************************************************************************** |
201 |
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* |
202 |
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* V4L2 M2M Interface |
203 |
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* |
204 |
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******************************************************************************/ |
205 |
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int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *s) |
206 |
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{ |
207 |
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void *log_ctx = s->avctx; |
208 |
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int ret; |
209 |
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|
210 |
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av_log(log_ctx, AV_LOG_DEBUG, "reinit context\n"); |
211 |
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212 |
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/* 1. streamoff */ |
213 |
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ret = ff_v4l2_context_set_status(&s->capture, VIDIOC_STREAMOFF); |
214 |
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if (ret) |
215 |
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av_log(log_ctx, AV_LOG_ERROR, "capture VIDIOC_STREAMOFF\n"); |
216 |
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|
217 |
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/* 2. unmap the capture buffers (v4l2 and ffmpeg): |
218 |
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* we must wait for all references to be released before being allowed |
219 |
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* to queue new buffers. |
220 |
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*/ |
221 |
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av_log(log_ctx, AV_LOG_DEBUG, "waiting for user to release AVBufferRefs\n"); |
222 |
|
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if (atomic_load(&s->refcount)) |
223 |
|
|
while(sem_wait(&s->refsync) == -1 && errno == EINTR); |
224 |
|
|
|
225 |
|
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ff_v4l2_context_release(&s->capture); |
226 |
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|
227 |
|
|
/* 3. get the new capture format */ |
228 |
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ret = ff_v4l2_context_get_format(&s->capture, 0); |
229 |
|
|
if (ret) { |
230 |
|
|
av_log(log_ctx, AV_LOG_ERROR, "query the new capture format\n"); |
231 |
|
|
return ret; |
232 |
|
|
} |
233 |
|
|
|
234 |
|
|
/* 4. set the capture format */ |
235 |
|
|
ret = ff_v4l2_context_set_format(&s->capture); |
236 |
|
|
if (ret) { |
237 |
|
|
av_log(log_ctx, AV_LOG_ERROR, "setting capture format\n"); |
238 |
|
|
return ret; |
239 |
|
|
} |
240 |
|
|
|
241 |
|
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/* 5. complete reinit */ |
242 |
|
|
s->draining = 0; |
243 |
|
|
s->reinit = 0; |
244 |
|
|
|
245 |
|
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return 0; |
246 |
|
|
} |
247 |
|
|
|
248 |
|
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int ff_v4l2_m2m_codec_full_reinit(V4L2m2mContext *s) |
249 |
|
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{ |
250 |
|
|
void *log_ctx = s->avctx; |
251 |
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int ret; |
252 |
|
|
|
253 |
|
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av_log(log_ctx, AV_LOG_DEBUG, "%s full reinit\n", s->devname); |
254 |
|
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|
255 |
|
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/* wait for pending buffer references */ |
256 |
|
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if (atomic_load(&s->refcount)) |
257 |
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while(sem_wait(&s->refsync) == -1 && errno == EINTR); |
258 |
|
|
|
259 |
|
|
ret = ff_v4l2_context_set_status(&s->output, VIDIOC_STREAMOFF); |
260 |
|
|
if (ret) { |
261 |
|
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av_log(log_ctx, AV_LOG_ERROR, "output VIDIOC_STREAMOFF\n"); |
262 |
|
|
goto error; |
263 |
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|
} |
264 |
|
|
|
265 |
|
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ret = ff_v4l2_context_set_status(&s->capture, VIDIOC_STREAMOFF); |
266 |
|
|
if (ret) { |
267 |
|
|
av_log(log_ctx, AV_LOG_ERROR, "capture VIDIOC_STREAMOFF\n"); |
268 |
|
|
goto error; |
269 |
|
|
} |
270 |
|
|
|
271 |
|
|
/* release and unmmap the buffers */ |
272 |
|
|
ff_v4l2_context_release(&s->output); |
273 |
|
|
ff_v4l2_context_release(&s->capture); |
274 |
|
|
|
275 |
|
|
/* start again now that we know the stream dimensions */ |
276 |
|
|
s->draining = 0; |
277 |
|
|
s->reinit = 0; |
278 |
|
|
|
279 |
|
|
ret = ff_v4l2_context_get_format(&s->output, 0); |
280 |
|
|
if (ret) { |
281 |
|
|
av_log(log_ctx, AV_LOG_DEBUG, "v4l2 output format not supported\n"); |
282 |
|
|
goto error; |
283 |
|
|
} |
284 |
|
|
|
285 |
|
|
ret = ff_v4l2_context_get_format(&s->capture, 0); |
286 |
|
|
if (ret) { |
287 |
|
|
av_log(log_ctx, AV_LOG_DEBUG, "v4l2 capture format not supported\n"); |
288 |
|
|
goto error; |
289 |
|
|
} |
290 |
|
|
|
291 |
|
|
ret = ff_v4l2_context_set_format(&s->output); |
292 |
|
|
if (ret) { |
293 |
|
|
av_log(log_ctx, AV_LOG_ERROR, "can't set v4l2 output format\n"); |
294 |
|
|
goto error; |
295 |
|
|
} |
296 |
|
|
|
297 |
|
|
ret = ff_v4l2_context_set_format(&s->capture); |
298 |
|
|
if (ret) { |
299 |
|
|
av_log(log_ctx, AV_LOG_ERROR, "can't to set v4l2 capture format\n"); |
300 |
|
|
goto error; |
301 |
|
|
} |
302 |
|
|
|
303 |
|
|
ret = ff_v4l2_context_init(&s->output); |
304 |
|
|
if (ret) { |
305 |
|
|
av_log(log_ctx, AV_LOG_ERROR, "no v4l2 output context's buffers\n"); |
306 |
|
|
goto error; |
307 |
|
|
} |
308 |
|
|
|
309 |
|
|
/* decoder's buffers need to be updated at a later stage */ |
310 |
|
|
if (s->avctx && !av_codec_is_decoder(s->avctx->codec)) { |
311 |
|
|
ret = ff_v4l2_context_init(&s->capture); |
312 |
|
|
if (ret) { |
313 |
|
|
av_log(log_ctx, AV_LOG_ERROR, "no v4l2 capture context's buffers\n"); |
314 |
|
|
goto error; |
315 |
|
|
} |
316 |
|
|
} |
317 |
|
|
|
318 |
|
|
return 0; |
319 |
|
|
|
320 |
|
|
error: |
321 |
|
|
return ret; |
322 |
|
|
} |
323 |
|
|
|
324 |
|
|
static void v4l2_m2m_destroy_context(void *opaque, uint8_t *context) |
325 |
|
|
{ |
326 |
|
|
V4L2m2mContext *s = (V4L2m2mContext*)context; |
327 |
|
|
|
328 |
|
|
ff_v4l2_context_release(&s->capture); |
329 |
|
|
sem_destroy(&s->refsync); |
330 |
|
|
|
331 |
|
|
close(s->fd); |
332 |
|
|
av_frame_unref(s->frame); |
333 |
|
|
av_frame_free(&s->frame); |
334 |
|
|
av_packet_unref(&s->buf_pkt); |
335 |
|
|
|
336 |
|
|
av_free(s); |
337 |
|
|
} |
338 |
|
|
|
339 |
|
|
int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv) |
340 |
|
|
{ |
341 |
|
|
V4L2m2mContext *s = priv->context; |
342 |
|
|
int ret; |
343 |
|
|
|
344 |
|
|
if (!s) |
345 |
|
|
return 0; |
346 |
|
|
|
347 |
|
|
if (s->fd >= 0) { |
348 |
|
|
ret = ff_v4l2_context_set_status(&s->output, VIDIOC_STREAMOFF); |
349 |
|
|
if (ret) |
350 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->output.name); |
351 |
|
|
|
352 |
|
|
ret = ff_v4l2_context_set_status(&s->capture, VIDIOC_STREAMOFF); |
353 |
|
|
if (ret) |
354 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->capture.name); |
355 |
|
|
} |
356 |
|
|
|
357 |
|
|
ff_v4l2_context_release(&s->output); |
358 |
|
|
|
359 |
|
|
s->self_ref = NULL; |
360 |
|
|
av_buffer_unref(&priv->context_ref); |
361 |
|
|
|
362 |
|
|
return 0; |
363 |
|
|
} |
364 |
|
|
|
365 |
|
|
int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv) |
366 |
|
|
{ |
367 |
|
|
int ret = AVERROR(EINVAL); |
368 |
|
|
struct dirent *entry; |
369 |
|
|
DIR *dirp; |
370 |
|
|
|
371 |
|
|
V4L2m2mContext *s = priv->context; |
372 |
|
|
|
373 |
|
|
dirp = opendir("/dev"); |
374 |
|
|
if (!dirp) |
375 |
|
|
return AVERROR(errno); |
376 |
|
|
|
377 |
|
|
for (entry = readdir(dirp); entry; entry = readdir(dirp)) { |
378 |
|
|
|
379 |
|
|
if (strncmp(entry->d_name, "video", 5)) |
380 |
|
|
continue; |
381 |
|
|
|
382 |
|
|
snprintf(s->devname, sizeof(s->devname), "/dev/%s", entry->d_name); |
383 |
|
|
av_log(s->avctx, AV_LOG_DEBUG, "probing device %s\n", s->devname); |
384 |
|
|
ret = v4l2_probe_driver(s); |
385 |
|
|
if (!ret) |
386 |
|
|
break; |
387 |
|
|
} |
388 |
|
|
|
389 |
|
|
closedir(dirp); |
390 |
|
|
|
391 |
|
|
if (ret) { |
392 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "Could not find a valid device\n"); |
393 |
|
|
memset(s->devname, 0, sizeof(s->devname)); |
394 |
|
|
|
395 |
|
|
return ret; |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
av_log(s->avctx, AV_LOG_INFO, "Using device %s\n", s->devname); |
399 |
|
|
|
400 |
|
|
return v4l2_configure_contexts(s); |
401 |
|
|
} |
402 |
|
|
|
403 |
|
|
int ff_v4l2_m2m_create_context(V4L2m2mPriv *priv, V4L2m2mContext **s) |
404 |
|
|
{ |
405 |
|
|
*s = av_mallocz(sizeof(V4L2m2mContext)); |
406 |
|
|
if (!*s) |
407 |
|
|
return AVERROR(ENOMEM); |
408 |
|
|
|
409 |
|
|
priv->context_ref = av_buffer_create((uint8_t *) *s, sizeof(V4L2m2mContext), |
410 |
|
|
&v4l2_m2m_destroy_context, NULL, 0); |
411 |
|
|
if (!priv->context_ref) { |
412 |
|
|
av_freep(s); |
413 |
|
|
return AVERROR(ENOMEM); |
414 |
|
|
} |
415 |
|
|
|
416 |
|
|
/* assign the context */ |
417 |
|
|
priv->context = *s; |
418 |
|
|
(*s)->priv = priv; |
419 |
|
|
|
420 |
|
|
/* populate it */ |
421 |
|
|
priv->context->capture.num_buffers = priv->num_capture_buffers; |
422 |
|
|
priv->context->output.num_buffers = priv->num_output_buffers; |
423 |
|
|
priv->context->self_ref = priv->context_ref; |
424 |
|
|
priv->context->fd = -1; |
425 |
|
|
|
426 |
|
|
priv->context->frame = av_frame_alloc(); |
427 |
|
|
if (!priv->context->frame) { |
428 |
|
|
av_buffer_unref(&priv->context_ref); |
429 |
|
|
*s = NULL; /* freed when unreferencing context_ref */ |
430 |
|
|
return AVERROR(ENOMEM); |
431 |
|
|
} |
432 |
|
|
|
433 |
|
|
return 0; |
434 |
|
|
} |