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[ffmpeg.git] / libavdevice / xv.c
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
58 static int xv_write_header(AVFormatContext *s)
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
143 static int xv_write_packet(AVFormatContext *s, AVPacket *pkt)
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
177 static int xv_write_trailer(AVFormatContext *s)
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
206 AVOutputFormat ff_xv_muxer = {
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,
212     .write_header   = xv_write_header,
213     .write_packet   = xv_write_packet,
214     .write_trailer  = xv_write_trailer,
215     .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
216     .priv_class     = &xv_class,
217 };