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path: root/libavdevice/xv.c (plain)
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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 */
28
29#include <X11/Xlib.h>
30#include <X11/extensions/Xv.h>
31#include <X11/extensions/XShm.h>
32#include <X11/extensions/Xvlib.h>
33#include <sys/shm.h>
34
35#include "libavutil/opt.h"
36#include "libavutil/pixdesc.h"
37#include "libavutil/imgutils.h"
38#include "libavformat/internal.h"
39#include "avdevice.h"
40
41typedef struct {
42 AVClass *class;
43 GC gc;
44
45 Window window;
46 int64_t window_id;
47 char *window_title;
48 int window_width, window_height;
49 int window_x, window_y;
50 int dest_x, dest_y; /**< display area position */
51 unsigned int dest_w, dest_h; /**< display area dimensions */
52
53 Display* display;
54 char *display_name;
55
56 XvImage* yuv_image;
57 enum AVPixelFormat image_format;
58 int image_width, image_height;
59 XShmSegmentInfo yuv_shminfo;
60 int xv_port;
61 Atom wm_delete_message;
62} XVContext;
63
64typedef struct XVTagFormatMap
65{
66 int tag;
67 enum AVPixelFormat format;
68} XVTagFormatMap;
69
70static const XVTagFormatMap tag_codec_map[] = {
71 { MKTAG('I','4','2','0'), AV_PIX_FMT_YUV420P },
72 { MKTAG('U','Y','V','Y'), AV_PIX_FMT_UYVY422 },
73 { MKTAG('Y','U','Y','2'), AV_PIX_FMT_YUYV422 },
74 { 0, AV_PIX_FMT_NONE }
75};
76
77static int xv_get_tag_from_format(enum AVPixelFormat format)
78{
79 const XVTagFormatMap *m = tag_codec_map;
80 int i;
81 for (i = 0; m->tag; m = &tag_codec_map[++i]) {
82 if (m->format == format)
83 return m->tag;
84 }
85 return 0;
86}
87
88static int xv_write_trailer(AVFormatContext *s)
89{
90 XVContext *xv = s->priv_data;
91 if (xv->display) {
92 XShmDetach(xv->display, &xv->yuv_shminfo);
93 if (xv->yuv_image)
94 shmdt(xv->yuv_image->data);
95 XFree(xv->yuv_image);
96 if (xv->gc)
97 XFreeGC(xv->display, xv->gc);
98 XCloseDisplay(xv->display);
99 }
100 return 0;
101}
102
103static int xv_write_header(AVFormatContext *s)
104{
105 XVContext *xv = s->priv_data;
106 unsigned int num_adaptors;
107 XvAdaptorInfo *ai;
108 XvImageFormatValues *fv;
109 XColor fgcolor;
110 XWindowAttributes window_attrs;
111 int num_formats = 0, j, tag, ret;
112 AVCodecParameters *par = s->streams[0]->codecpar;
113
114 if ( s->nb_streams > 1
115 || par->codec_type != AVMEDIA_TYPE_VIDEO
116 || par->codec_id != AV_CODEC_ID_RAWVIDEO) {
117 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
118 return AVERROR(EINVAL);
119 }
120
121 if (!(tag = xv_get_tag_from_format(par->format))) {
122 av_log(s, AV_LOG_ERROR,
123 "Unsupported pixel format '%s', only yuv420p, uyvy422, yuyv422 are currently supported\n",
124 av_get_pix_fmt_name(par->format));
125 return AVERROR_PATCHWELCOME;
126 }
127 xv->image_format = par->format;
128
129 xv->display = XOpenDisplay(xv->display_name);
130 if (!xv->display) {
131 av_log(s, AV_LOG_ERROR, "Could not open the X11 display '%s'\n", xv->display_name);
132 return AVERROR(EINVAL);
133 }
134
135 xv->image_width = par->width;
136 xv->image_height = par->height;
137 if (!xv->window_width && !xv->window_height) {
138 AVRational sar = par->sample_aspect_ratio;
139 xv->window_width = par->width;
140 xv->window_height = par->height;
141 if (sar.num) {
142 if (sar.num > sar.den)
143 xv->window_width = av_rescale(xv->window_width, sar.num, sar.den);
144 if (sar.num < sar.den)
145 xv->window_height = av_rescale(xv->window_height, sar.den, sar.num);
146 }
147 }
148 if (!xv->window_id) {
149 xv->window = XCreateSimpleWindow(xv->display, DefaultRootWindow(xv->display),
150 xv->window_x, xv->window_y,
151 xv->window_width, xv->window_height,
152 0, 0, 0);
153 if (!xv->window_title) {
154 if (!(xv->window_title = av_strdup(s->filename))) {
155 ret = AVERROR(ENOMEM);
156 goto fail;
157 }
158 }
159 XStoreName(xv->display, xv->window, xv->window_title);
160 xv->wm_delete_message = XInternAtom(xv->display, "WM_DELETE_WINDOW", False);
161 XSetWMProtocols(xv->display, xv->window, &xv->wm_delete_message, 1);
162 XMapWindow(xv->display, xv->window);
163 } else
164 xv->window = xv->window_id;
165
166 if (XvQueryAdaptors(xv->display, DefaultRootWindow(xv->display), &num_adaptors, &ai) != Success) {
167 ret = AVERROR_EXTERNAL;
168 goto fail;
169 }
170 if (!num_adaptors) {
171 av_log(s, AV_LOG_ERROR, "No X-Video adaptors present\n");
172 return AVERROR(ENODEV);
173 }
174 xv->xv_port = ai[0].base_id;
175 XvFreeAdaptorInfo(ai);
176
177 fv = XvListImageFormats(xv->display, xv->xv_port, &num_formats);
178 if (!fv) {
179 ret = AVERROR_EXTERNAL;
180 goto fail;
181 }
182 for (j = 0; j < num_formats; j++) {
183 if (fv[j].id == tag) {
184 break;
185 }
186 }
187 XFree(fv);
188
189 if (j >= num_formats) {
190 av_log(s, AV_LOG_ERROR,
191 "Device does not support pixel format %s, aborting\n",
192 av_get_pix_fmt_name(par->format));
193 ret = AVERROR(EINVAL);
194 goto fail;
195 }
196
197 xv->gc = XCreateGC(xv->display, xv->window, 0, 0);
198 xv->image_width = par->width;
199 xv->image_height = par->height;
200 xv->yuv_image = XvShmCreateImage(xv->display, xv->xv_port, tag, 0,
201 xv->image_width, xv->image_height, &xv->yuv_shminfo);
202 xv->yuv_shminfo.shmid = shmget(IPC_PRIVATE, xv->yuv_image->data_size,
203 IPC_CREAT | 0777);
204 xv->yuv_shminfo.shmaddr = (char *)shmat(xv->yuv_shminfo.shmid, 0, 0);
205 xv->yuv_image->data = xv->yuv_shminfo.shmaddr;
206 xv->yuv_shminfo.readOnly = False;
207
208 XShmAttach(xv->display, &xv->yuv_shminfo);
209 XSync(xv->display, False);
210 shmctl(xv->yuv_shminfo.shmid, IPC_RMID, 0);
211
212 XGetWindowAttributes(xv->display, xv->window, &window_attrs);
213 fgcolor.red = fgcolor.green = fgcolor.blue = 0;
214 fgcolor.flags = DoRed | DoGreen | DoBlue;
215 XAllocColor(xv->display, window_attrs.colormap, &fgcolor);
216 XSetForeground(xv->display, xv->gc, fgcolor.pixel);
217 //force display area recalculation at first frame
218 xv->window_width = xv->window_height = 0;
219
220 return 0;
221 fail:
222 xv_write_trailer(s);
223 return ret;
224}
225
226static void compute_display_area(AVFormatContext *s)
227{
228 XVContext *xv = s->priv_data;
229 AVRational sar, dar; /* sample and display aspect ratios */
230 AVStream *st = s->streams[0];
231 AVCodecParameters *par = st->codecpar;
232
233 /* compute overlay width and height from the codec context information */
234 sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
235 dar = av_mul_q(sar, (AVRational){ par->width, par->height });
236
237 /* we suppose the screen has a 1/1 sample aspect ratio */
238 /* fit in the window */
239 if (av_cmp_q(dar, (AVRational){ xv->dest_w, xv->dest_h }) > 0) {
240 /* fit in width */
241 xv->dest_y = xv->dest_h;
242 xv->dest_x = 0;
243 xv->dest_h = av_rescale(xv->dest_w, dar.den, dar.num);
244 xv->dest_y -= xv->dest_h;
245 xv->dest_y /= 2;
246 } else {
247 /* fit in height */
248 xv->dest_x = xv->dest_w;
249 xv->dest_y = 0;
250 xv->dest_w = av_rescale(xv->dest_h, dar.num, dar.den);
251 xv->dest_x -= xv->dest_w;
252 xv->dest_x /= 2;
253 }
254}
255
256static int xv_repaint(AVFormatContext *s)
257{
258 XVContext *xv = s->priv_data;
259 XWindowAttributes window_attrs;
260
261 XGetWindowAttributes(xv->display, xv->window, &window_attrs);
262 if (window_attrs.width != xv->window_width || window_attrs.height != xv->window_height) {
263 XRectangle rect[2];
264 xv->dest_w = window_attrs.width;
265 xv->dest_h = window_attrs.height;
266 compute_display_area(s);
267 if (xv->dest_x) {
268 rect[0].width = rect[1].width = xv->dest_x;
269 rect[0].height = rect[1].height = window_attrs.height;
270 rect[0].y = rect[1].y = 0;
271 rect[0].x = 0;
272 rect[1].x = xv->dest_w + xv->dest_x;
273 XFillRectangles(xv->display, xv->window, xv->gc, rect, 2);
274 }
275 if (xv->dest_y) {
276 rect[0].width = rect[1].width = window_attrs.width;
277 rect[0].height = rect[1].height = xv->dest_y;
278 rect[0].x = rect[1].x = 0;
279 rect[0].y = 0;
280 rect[1].y = xv->dest_h + xv->dest_y;
281 XFillRectangles(xv->display, xv->window, xv->gc, rect, 2);
282 }
283 }
284
285 if (XvShmPutImage(xv->display, xv->xv_port, xv->window, xv->gc,
286 xv->yuv_image, 0, 0, xv->image_width, xv->image_height,
287 xv->dest_x, xv->dest_y, xv->dest_w, xv->dest_h, True) != Success) {
288 av_log(s, AV_LOG_ERROR, "Could not copy image to XV shared memory buffer\n");
289 return AVERROR_EXTERNAL;
290 }
291 return 0;
292}
293
294static int write_picture(AVFormatContext *s, uint8_t *input_data[4],
295 int linesize[4])
296{
297 XVContext *xv = s->priv_data;
298 XvImage *img = xv->yuv_image;
299 uint8_t *data[3] = {
300 img->data + img->offsets[0],
301 img->data + img->offsets[1],
302 img->data + img->offsets[2]
303 };
304
305 /* Check messages. Window might get closed. */
306 if (!xv->window_id) {
307 XEvent event;
308 while (XPending(xv->display)) {
309 XNextEvent(xv->display, &event);
310 if (event.type == ClientMessage && event.xclient.data.l[0] == xv->wm_delete_message) {
311 av_log(xv, AV_LOG_DEBUG, "Window close event.\n");
312 return AVERROR(EPIPE);
313 }
314 }
315 }
316
317 av_image_copy(data, img->pitches, (const uint8_t **)input_data, linesize,
318 xv->image_format, img->width, img->height);
319 return xv_repaint(s);
320}
321
322static int xv_write_packet(AVFormatContext *s, AVPacket *pkt)
323{
324 AVCodecParameters *par = s->streams[0]->codecpar;
325 uint8_t *data[4];
326 int linesize[4];
327
328 av_image_fill_arrays(data, linesize, pkt->data, par->format,
329 par->width, par->height, 1);
330 return write_picture(s, data, linesize);
331}
332
333static int xv_write_frame(AVFormatContext *s, int stream_index, AVFrame **frame,
334 unsigned flags)
335{
336 /* xv_write_header() should have accepted only supported formats */
337 if ((flags & AV_WRITE_UNCODED_FRAME_QUERY))
338 return 0;
339 return write_picture(s, (*frame)->data, (*frame)->linesize);
340}
341
342static int xv_control_message(AVFormatContext *s, int type, void *data, size_t data_size)
343{
344 switch(type) {
345 case AV_APP_TO_DEV_WINDOW_REPAINT:
346 return xv_repaint(s);
347 default:
348 break;
349 }
350 return AVERROR(ENOSYS);
351}
352
353#define OFFSET(x) offsetof(XVContext, x)
354static const AVOption options[] = {
355 { "display_name", "set display name", OFFSET(display_name), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
356 { "window_id", "set existing window id", OFFSET(window_id), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM },
357 { "window_size", "set window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
358 { "window_title", "set window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
359 { "window_x", "set window x offset", OFFSET(window_x), AV_OPT_TYPE_INT, {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
360 { "window_y", "set window y offset", OFFSET(window_y), AV_OPT_TYPE_INT, {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
361 { NULL }
362
363};
364
365static const AVClass xv_class = {
366 .class_name = "xvideo outdev",
367 .item_name = av_default_item_name,
368 .option = options,
369 .version = LIBAVUTIL_VERSION_INT,
370 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
371};
372
373AVOutputFormat ff_xv_muxer = {
374 .name = "xv",
375 .long_name = NULL_IF_CONFIG_SMALL("XV (XVideo) output device"),
376 .priv_data_size = sizeof(XVContext),
377 .audio_codec = AV_CODEC_ID_NONE,
378 .video_codec = AV_CODEC_ID_RAWVIDEO,
379 .write_header = xv_write_header,
380 .write_packet = xv_write_packet,
381 .write_uncoded_frame = xv_write_frame,
382 .write_trailer = xv_write_trailer,
383 .control_message = xv_control_message,
384 .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
385 .priv_class = &xv_class,
386};
387
generated by cgit at 2024-05-17 04:42:23 (GMT)