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xv.c
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1 /*
2  * Copyright (c) 2013 Jeff Moguillansky
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * XVideo output device
24  *
25  * TODO:
26  * - add support to more formats
27  * - add support to window id specification
28  */
29 
30 #include <X11/Xlib.h>
31 #include <X11/extensions/Xv.h>
32 #include <X11/extensions/Xvlib.h>
33 #include <X11/extensions/XShm.h>
34 #include <sys/shm.h>
35 
36 #include "libavutil/opt.h"
37 #include "libavutil/pixdesc.h"
38 #include "avdevice.h"
39 
40 typedef struct {
41  AVClass *class;
42  GC gc;
43 
44  Window window;
45  char *window_title;
46  int window_width, window_height;
47  int window_x, window_y;
48 
49  Display* display;
50  char *display_name;
51 
52  XvImage* yuv_image;
53  int image_width, image_height;
54  XShmSegmentInfo yuv_shminfo;
55  int xv_port;
56 } XVContext;
57 
59 {
60  XVContext *xv = s->priv_data;
61  unsigned int num_adaptors;
62  XvAdaptorInfo *ai;
63  XvImageFormatValues *fv;
64  int num_formats = 0, j;
65  AVCodecContext *encctx = s->streams[0]->codec;
66 
67  if ( s->nb_streams > 1
68  || encctx->codec_type != AVMEDIA_TYPE_VIDEO
69  || encctx->codec_id != AV_CODEC_ID_RAWVIDEO) {
70  av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
71  return AVERROR(EINVAL);
72  }
73 
74  xv->display = XOpenDisplay(xv->display_name);
75  if (!xv->display) {
76  av_log(s, AV_LOG_ERROR, "Could not open the X11 display '%s'\n", xv->display_name);
77  return AVERROR(EINVAL);
78  }
79 
80  xv->image_width = encctx->width;
81  xv->image_height = encctx->height;
82  if (!xv->window_width && !xv->window_height) {
83  xv->window_width = encctx->width;
84  xv->window_height = encctx->height;
85  }
86  xv->window = XCreateSimpleWindow(xv->display, DefaultRootWindow(xv->display),
87  xv->window_x, xv->window_y,
88  xv->window_width, xv->window_height,
89  0, 0, 0);
90  if (!xv->window_title) {
91  if (!(xv->window_title = av_strdup(s->filename)))
92  return AVERROR(ENOMEM);
93  }
94  XStoreName(xv->display, xv->window, xv->window_title);
95  XMapWindow(xv->display, xv->window);
96 
97  if (XvQueryAdaptors(xv->display, DefaultRootWindow(xv->display), &num_adaptors, &ai) != Success)
98  return AVERROR_EXTERNAL;
99  xv->xv_port = ai[0].base_id;
100 
101  if (encctx->pix_fmt != AV_PIX_FMT_YUV420P) {
102  av_log(s, AV_LOG_ERROR,
103  "Unsupported pixel format '%s', only yuv420p is currently supported\n",
104  av_get_pix_fmt_name(encctx->pix_fmt));
105  return AVERROR_PATCHWELCOME;
106  }
107 
108  fv = XvListImageFormats(xv->display, xv->xv_port, &num_formats);
109  if (!fv)
110  return AVERROR_EXTERNAL;
111  for (j = 0; j < num_formats; j++) {
112  if (fv[j].id == MKTAG('I','4','2','0')) {
113  break;
114  }
115  }
116  XFree(fv);
117 
118  if (j >= num_formats) {
119  av_log(s, AV_LOG_ERROR,
120  "Device does not support pixel format yuv420p, aborting\n");
121  return AVERROR(EINVAL);
122  }
123 
124  xv->gc = XCreateGC(xv->display, xv->window, 0, 0);
125  xv->image_width = encctx->width;
126  xv->image_height = encctx->height;
127  xv->yuv_image = XvShmCreateImage(xv->display, xv->xv_port,
128  MKTAG('I','4','2','0'), 0,
129  xv->image_width, xv->image_height, &xv->yuv_shminfo);
130  xv->yuv_shminfo.shmid = shmget(IPC_PRIVATE, xv->yuv_image->data_size,
131  IPC_CREAT | 0777);
132  xv->yuv_shminfo.shmaddr = (char *)shmat(xv->yuv_shminfo.shmid, 0, 0);
133  xv->yuv_image->data = xv->yuv_shminfo.shmaddr;
134  xv->yuv_shminfo.readOnly = False;
135 
136  XShmAttach(xv->display, &xv->yuv_shminfo);
137  XSync(xv->display, False);
138  shmctl(xv->yuv_shminfo.shmid, IPC_RMID, 0);
139 
140  return 0;
141 }
142 
144 {
145  XVContext *xv = s->priv_data;
146  XvImage *img = xv->yuv_image;
147  XWindowAttributes window_attrs;
148  AVPicture pict;
149  AVCodecContext *ctx = s->streams[0]->codec;
150  int y, h;
151 
152  h = img->height / 2;
153 
154  avpicture_fill(&pict, pkt->data, ctx->pix_fmt, ctx->width, ctx->height);
155  for (y = 0; y < img->height; y++) {
156  memcpy(&img->data[img->offsets[0] + (y * img->pitches[0])],
157  &pict.data[0][y * pict.linesize[0]], img->pitches[0]);
158  }
159 
160  for (y = 0; y < h; ++y) {
161  memcpy(&img->data[img->offsets[1] + (y * img->pitches[1])],
162  &pict.data[1][y * pict.linesize[1]], img->pitches[1]);
163  memcpy(&img->data[img->offsets[2] + (y * img->pitches[2])],
164  &pict.data[2][y * pict.linesize[2]], img->pitches[2]);
165  }
166 
167  XGetWindowAttributes(xv->display, xv->window, &window_attrs);
168  if (XvShmPutImage(xv->display, xv->xv_port, xv->window, xv->gc,
169  xv->yuv_image, 0, 0, xv->image_width, xv->image_height, 0, 0,
170  window_attrs.width, window_attrs.height, True) != Success) {
171  av_log(s, AV_LOG_ERROR, "Could not copy image to XV shared memory buffer\n");
172  return AVERROR_EXTERNAL;
173  }
174  return 0;
175 }
176 
178 {
179  XVContext *xv = s->priv_data;
180 
181  XShmDetach(xv->display, &xv->yuv_shminfo);
182  shmdt(xv->yuv_image->data);
183  XFree(xv->yuv_image);
184  XCloseDisplay(xv->display);
185  return 0;
186 }
187 
188 #define OFFSET(x) offsetof(XVContext, x)
189 static const AVOption options[] = {
190  { "display_name", "set display name", OFFSET(display_name), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
191  { "window_size", "set window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
192  { "window_title", "set window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
193  { "window_x", "set window x offset", OFFSET(window_x), AV_OPT_TYPE_INT, {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
194  { "window_y", "set window y offset", OFFSET(window_y), AV_OPT_TYPE_INT, {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
195  { NULL }
196 
197 };
198 
199 static const AVClass xv_class = {
200  .class_name = "xvideo outdev",
201  .item_name = av_default_item_name,
202  .option = options,
203  .version = LIBAVUTIL_VERSION_INT,
204 };
205 
207  .name = "xv",
208  .long_name = NULL_IF_CONFIG_SMALL("XV (XVideo) output device"),
209  .priv_data_size = sizeof(XVContext),
210  .audio_codec = AV_CODEC_ID_NONE,
211  .video_codec = AV_CODEC_ID_RAWVIDEO,
216  .priv_class = &xv_class,
217 };