FFmpeg: libavdevice/xv.c Source File

FFmpeg
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  */
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 
41  typedef 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 
64  typedef struct XVTagFormatMap
65 {
66   int tag;
67   enum AVPixelFormat format;
68 } XVTagFormatMap;
69 
70  static 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 
77  static 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 
88  static 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 
103  static 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  AVCodecContext *encctx = s->streams[0]->codec;
113 
114  if ( s->nb_streams > 1
115  || encctx->codec_type != AVMEDIA_TYPE_VIDEO
116  || encctx->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(encctx->pix_fmt))) {
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(encctx->pix_fmt));
125  return AVERROR_PATCHWELCOME;
126  }
127  xv->image_format = encctx->pix_fmt;
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 = encctx->width;
136  xv->image_height = encctx->height;
137  if (!xv->window_width && !xv->window_height) {
138  AVRational sar = encctx->sample_aspect_ratio;
139  xv->window_width = encctx->width;
140  xv->window_height = encctx->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(encctx->pix_fmt));
193  ret = AVERROR(EINVAL);
194  goto fail;
195  }
196 
197  xv->gc = XCreateGC(xv->display, xv->window, 0, 0);
198  xv->image_width = encctx->width;
199  xv->image_height = encctx->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 
226  static 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  AVCodecContext *encctx = st->codec;
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){ encctx->width, encctx->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 
256  static 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 
294  static 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 
322  static int xv_write_packet(AVFormatContext *s, AVPacket *pkt)
323 {
324  AVCodecContext *ctx = s->streams[0]->codec;
325  uint8_t *data[4];
326  int linesize[4];
327 
328  av_image_fill_arrays(data, linesize, pkt->data, ctx->pix_fmt,
329  ctx->width, ctx->height, 1);
330  return write_picture(s, data, linesize);
331 }
332 
333  static 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 
342  static 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)
354  static 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 
365  static 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 
373  AVOutputFormat 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 };
AV_PIX_FMT_UYVY422
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:83
NULL
#define NULL
Definition: coverity.c:32
AV_OPT_TYPE_INT64
Definition: opt.h:224
s
const char * s
Definition: avisynth_c.h:631
AV_CODEC_ID_NONE
Definition: avcodec.h:102
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:181
compute_display_area
static void compute_display_area(AVFormatContext *s)
Definition: xv.c:226
AVOption
AVOption.
Definition: opt.h:245
data
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
ctx
AVFormatContext * ctx
Definition: movenc-test.c:48
options
static const AVOption options[]
Definition: xv.c:354
imgutils.h
misc image utilities
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
AV_OPT_TYPE_INT
Definition: opt.h:223
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:949
AVRational::num
int num
numerator
Definition: rational.h:44
av_image_fill_arrays
int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], const uint8_t *src, enum AVPixelFormat pix_fmt, int width, int height, int align)
Setup the data pointers and linesizes based on the specified image parameters and the provided array...
Definition: imgutils.c:341
XVContext::dest_h
unsigned int dest_h
display area dimensions
Definition: xv.c:51
AVCodecContext::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1935
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1752
AV_APP_TO_DEV_WINDOW_REPAINT
Repaint request message.
Definition: avdevice.h:143
av_cmp_q
static int av_cmp_q(AVRational a, AVRational b)
Compare two rationals.
Definition: rational.h:66
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
xv_write_header
static int xv_write_header(AVFormatContext *s)
Definition: xv.c:103
xv_repaint
static int xv_repaint(AVFormatContext *s)
Definition: xv.c:256
AVFormatContext
Format I/O context.
Definition: avformat.h:1314
img
#define img
Definition: vf_colormatrix.c:121
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
xv_write_frame
static int xv_write_frame(AVFormatContext *s, int stream_index, AVFrame **frame, unsigned flags)
Definition: xv.c:333
uint8_t
uint8_t
Definition: audio_convert.c:194
XVContext::yuv_shminfo
XShmSegmentInfo yuv_shminfo
Definition: xv.c:59
opt.h
AVOptions.
AV_WRITE_UNCODED_FRAME_QUERY
Query whether the feature is possible on this stream.
Definition: internal.h:528
XVContext::dest_y
int dest_y
display area position
Definition: xv.c:50
xv_get_tag_from_format
static int xv_get_tag_from_format(enum AVPixelFormat format)
Definition: xv.c:77
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1382
frame
static AVFrame * frame
Definition: demuxing_decoding.c:53
XVTagFormatMap::format
enum AVPixelFormat format
Definition: xv.c:67
XVContext::window_x
int window_x
Definition: xv.c:49
AV_OPT_TYPE_STRING
Definition: opt.h:227
AVPacket::data
uint8_t * data
Definition: avcodec.h:1467
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
tag
uint32_t tag
Definition: movenc.c:1348
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AV_OPT_FLAG_ENCODING_PARAM
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:275
m
unsigned m
Definition: audioconvert.c:187
XVContext::window_width
int window_width
Definition: xv.c:48
XVContext::display
Display * display
Definition: xv.c:53
avdevice.h
Main libavdevice API header.
xv_class
static const AVClass xv_class
Definition: xv.c:365
XVContext::window_id
int64_t window_id
Definition: xv.c:46
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
XVContext::image_format
enum AVPixelFormat image_format
Definition: xv.c:57
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:68
AVERROR
#define AVERROR(e)
Definition: error.h:43
xv_write_packet
static int xv_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: xv.c:322
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
XVTagFormatMap
Definition: xv.c:64
XVContext::window
Window window
Definition: xv.c:45
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
XVContext::yuv_image
XvImage * yuv_image
Definition: xv.c:56
Atom
Definition: r3d.c:36
fail
#define fail()
Definition: checkasm.h:80
av_image_copy
void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], const uint8_t *src_data[4], const int src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)
Copy image in src_data to dst_data.
Definition: imgutils.c:302
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1370
XVContext::xv_port
int xv_port
Definition: xv.c:60
AVFormatContext::filename
char filename[1024]
input or output filename
Definition: avformat.h:1390
av_rescale
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1711
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
AVOutputFormat::name
const char * name
Definition: avformat.h:523
xv_write_trailer
static int xv_write_trailer(AVFormatContext *s)
Definition: xv.c:88
XVTagFormatMap::tag
int tag
Definition: xv.c:66
XVContext::image_height
int image_height
Definition: xv.c:58
AVCodecContext::height
int height
Definition: avcodec.h:1711
AVStream
Stream structure.
Definition: avformat.h:877
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:485
XVContext
Definition: xv.c:41
XVContext::gc
GC gc
Definition: xv.c:43
XVContext::display_name
char * display_name
Definition: xv.c:54
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:1540
XVContext::dest_x
int dest_x
Definition: xv.c:50
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1549
XVContext::image_width
int image_width
Definition: xv.c:58
av_strdup
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:267
XVContext::wm_delete_message
Atom wm_delete_message
Definition: xv.c:61
AVCodecContext
main external API structure.
Definition: avcodec.h:1532
format
static const char * format
Definition: movenc-test.c:47
AV_PIX_FMT_YUYV422
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:64
XVContext::window_y
int window_y
Definition: xv.c:49
tag_codec_map
static const XVTagFormatMap tag_codec_map[]
Definition: xv.c:70
type
GLint GLenum type
Definition: opengl_enc.c:105
window_title
static const char * window_title
Definition: ffplay.c:315
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
xv_control_message
static int xv_control_message(AVFormatContext *s, int type, void *data, size_t data_size)
Definition: xv.c:342
rect
Definition: f_ebur128.c:90
XVContext::dest_w
unsigned int dest_w
Definition: xv.c:51
AVRational
rational number numerator/denominator
Definition: rational.h:43
XVContext::window_height
int window_height
Definition: xv.c:48
AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:232
flags
static int flags
Definition: cpu.c:47
OFFSET
#define OFFSET(x)
Definition: xv.c:353
ff_xv_muxer
AVOutputFormat ff_xv_muxer
Definition: xv.c:373
AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:63
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:477
AVRational::den
int den
denominator
Definition: rational.h:45
AVFMT_VARIABLE_FPS
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:488
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1342
write_picture
static int write_picture(AVFormatContext *s, uint8_t *input_data[4], int linesize[4])
Definition: xv.c:294
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:497
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
AV_CODEC_ID_RAWVIDEO
Definition: avcodec.h:120
av_get_pix_fmt_name
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2078
XVContext::window_title
char * window_title
Definition: xv.c:47
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:342
AVERROR_EXTERNAL
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1444
write_packet
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:86
Generated on Mon Feb 15 2016 15:20:43 for FFmpeg by   doxygen 1.8.6

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