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opengl_enc.c
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1 /*
2  * Copyright (c) 2014 Lukasz Marek
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 //TODO: support for more formats
22 //TODO: support for more systems.
23 //TODO: implement X11, Windows, Mac OS native default window. SDL 1.2 doesn't allow to render to custom thread.
24 
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <unistd.h>
29 #include <stddef.h>
30 
31 #include "config.h"
32 
33 #if HAVE_WINDOWS_H
34 #include <windows.h>
35 #endif
36 #if HAVE_OPENGL_GL3_H
37 #include <OpenGL/gl3.h>
38 #elif HAVE_ES2_GL_H
39 #include <ES2/gl.h>
40 #else
41 #include <GL/gl.h>
42 #include <GL/glext.h>
43 #endif
44 #if HAVE_GLXGETPROCADDRESS
45 #include <GL/glx.h>
46 #endif
47 
48 #if HAVE_SDL
49 #include <SDL.h>
50 #endif
51 
52 #include "libavutil/common.h"
53 #include "libavutil/pixdesc.h"
54 #include "libavutil/log.h"
55 #include "libavutil/opt.h"
56 #include "libavutil/avassert.h"
57 #include "libavutil/avstring.h"
58 #include "libavformat/avformat.h"
59 #include "libavformat/internal.h"
60 #include "libavdevice/avdevice.h"
61 #include "opengl_enc_shaders.h"
62 
63 #ifndef APIENTRY
64 #define APIENTRY
65 #endif
66 
67 /* FF_GL_RED_COMPONENT is used for plannar pixel types.
68  * Only red component is sampled in shaders.
69  * On some platforms GL_RED is not available and GL_LUMINANCE have to be used,
70  * but since OpenGL 3.0 GL_LUMINANCE is deprecated.
71  * GL_RED produces RGBA = value, 0, 0, 1.
72  * GL_LUMINANCE produces RGBA = value, value, value, 1.
73  * Note: GL_INTENSITY may also be used which produce RGBA = value, value, value, value. */
74 #if defined(GL_RED)
75 #define FF_GL_RED_COMPONENT GL_RED
76 #elif defined(GL_LUMINANCE)
77 #define FF_GL_RED_COMPONENT GL_LUMINANCE
78 #else
79 #define FF_GL_RED_COMPONENT 0x1903; //GL_RED
80 #endif
81 
82 /* Constants not defined for iOS */
83 #define FF_GL_UNSIGNED_BYTE_3_3_2 0x8032
84 #define FF_GL_UNSIGNED_BYTE_2_3_3_REV 0x8362
85 #define FF_GL_UNSIGNED_SHORT_1_5_5_5_REV 0x8366
86 #define FF_GL_UNPACK_ROW_LENGTH 0x0CF2
87 
88 /* MinGW exposes only OpenGL 1.1 API */
89 #define FF_GL_ARRAY_BUFFER 0x8892
90 #define FF_GL_ELEMENT_ARRAY_BUFFER 0x8893
91 #define FF_GL_STATIC_DRAW 0x88E4
92 #define FF_GL_FRAGMENT_SHADER 0x8B30
93 #define FF_GL_VERTEX_SHADER 0x8B31
94 #define FF_GL_COMPILE_STATUS 0x8B81
95 #define FF_GL_LINK_STATUS 0x8B82
96 #define FF_GL_INFO_LOG_LENGTH 0x8B84
97 typedef void (APIENTRY *FF_PFNGLACTIVETEXTUREPROC) (GLenum texture);
98 typedef void (APIENTRY *FF_PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
99 typedef void (APIENTRY *FF_PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);
100 typedef void (APIENTRY *FF_PFNGLBUFFERDATAPROC) (GLenum target, ptrdiff_t size, const GLvoid *data, GLenum usage);
101 typedef void (APIENTRY *FF_PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
102 typedef GLint (APIENTRY *FF_PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const char *name);
103 typedef void (APIENTRY *FF_PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
104 typedef void (APIENTRY *FF_PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, uintptr_t pointer);
105 typedef GLint (APIENTRY *FF_PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const char *name);
106 typedef void (APIENTRY *FF_PFNGLUNIFORM1FPROC) (GLint location, GLfloat v0);
107 typedef void (APIENTRY *FF_PFNGLUNIFORM1IPROC) (GLint location, GLint v0);
108 typedef void (APIENTRY *FF_PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
109 typedef GLuint (APIENTRY *FF_PFNGLCREATEPROGRAMPROC) (void);
110 typedef void (APIENTRY *FF_PFNGLDELETEPROGRAMPROC) (GLuint program);
111 typedef void (APIENTRY *FF_PFNGLUSEPROGRAMPROC) (GLuint program);
112 typedef void (APIENTRY *FF_PFNGLLINKPROGRAMPROC) (GLuint program);
113 typedef void (APIENTRY *FF_PFNGLGETPROGRAMIVPROC) (GLuint program, GLenum pname, GLint *params);
114 typedef void (APIENTRY *FF_PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, char *infoLog);
115 typedef void (APIENTRY *FF_PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader);
116 typedef GLuint (APIENTRY *FF_PFNGLCREATESHADERPROC) (GLenum type);
117 typedef void (APIENTRY *FF_PFNGLDELETESHADERPROC) (GLuint shader);
118 typedef void (APIENTRY *FF_PFNGLCOMPILESHADERPROC) (GLuint shader);
119 typedef void (APIENTRY *FF_PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const char* *string, const GLint *length);
120 typedef void (APIENTRY *FF_PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);
121 typedef void (APIENTRY *FF_PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, char *infoLog);
122 
123 typedef struct FFOpenGLFunctions {
124  FF_PFNGLACTIVETEXTUREPROC glActiveTexture; //Require GL ARB multitexture
125  FF_PFNGLGENBUFFERSPROC glGenBuffers; //Require GL_ARB_vertex_buffer_object
126  FF_PFNGLDELETEBUFFERSPROC glDeleteBuffers; //Require GL_ARB_vertex_buffer_object
127  FF_PFNGLBUFFERDATAPROC glBufferData; //Require GL_ARB_vertex_buffer_object
128  FF_PFNGLBINDBUFFERPROC glBindBuffer; //Require GL_ARB_vertex_buffer_object
129  FF_PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation; //Require GL_ARB_vertex_shader
130  FF_PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray; //Require GL_ARB_vertex_shader
131  FF_PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer; //Require GL_ARB_vertex_shader
132  FF_PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation; //Require GL_ARB_shader_objects
133  FF_PFNGLUNIFORM1FPROC glUniform1f; //Require GL_ARB_shader_objects
134  FF_PFNGLUNIFORM1IPROC glUniform1i; //Require GL_ARB_shader_objects
135  FF_PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv; //Require GL_ARB_shader_objects
136  FF_PFNGLCREATEPROGRAMPROC glCreateProgram; //Require GL_ARB_shader_objects
137  FF_PFNGLDELETEPROGRAMPROC glDeleteProgram; //Require GL_ARB_shader_objects
138  FF_PFNGLUSEPROGRAMPROC glUseProgram; //Require GL_ARB_shader_objects
139  FF_PFNGLLINKPROGRAMPROC glLinkProgram; //Require GL_ARB_shader_objects
140  FF_PFNGLGETPROGRAMIVPROC glGetProgramiv; //Require GL_ARB_shader_objects
141  FF_PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog; //Require GL_ARB_shader_objects
142  FF_PFNGLATTACHSHADERPROC glAttachShader; //Require GL_ARB_shader_objects
143  FF_PFNGLCREATESHADERPROC glCreateShader; //Require GL_ARB_shader_objects
144  FF_PFNGLDELETESHADERPROC glDeleteShader; //Require GL_ARB_shader_objects
145  FF_PFNGLCOMPILESHADERPROC glCompileShader; //Require GL_ARB_shader_objects
146  FF_PFNGLSHADERSOURCEPROC glShaderSource; //Require GL_ARB_shader_objects
147  FF_PFNGLGETSHADERIVPROC glGetShaderiv; //Require GL_ARB_shader_objects
148  FF_PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog; //Require GL_ARB_shader_objects
149 } FFOpenGLFunctions;
150 
151 #define OPENGL_ERROR_CHECK(ctx) \
152 {\
153  GLenum err_code; \
154  if ((err_code = glGetError()) != GL_NO_ERROR) { \
155  av_log(ctx, AV_LOG_ERROR, "OpenGL error occurred in '%s', line %d: %d\n", __FUNCTION__, __LINE__, err_code); \
156  goto fail; \
157  } \
158 }\
159 
160 typedef struct OpenGLVertexInfo
161 {
162  float x, y, z; ///<Position
163  float s0, t0; ///<Texture coords
164 } OpenGLVertexInfo;
165 
166 /* defines 2 triangles to display */
167 static GLushort g_index[6] =
168 {
169  0, 1, 2,
170  0, 3, 2,
171 };
172 
173 typedef struct OpenGLContext {
174  AVClass *class; ///< class for private options
175 
176 #if HAVE_SDL
177  SDL_Surface *surface;
178 #endif
179  FFOpenGLFunctions glprocs;
180 
181  int inited; ///< Set to 1 when write_header was successfully called.
182  uint8_t background[4]; ///< Background color
183  int no_window; ///< 0 for create default window
184  char *window_title; ///< Title of the window
185 
186  /* OpenGL implementation limits */
187  GLint max_texture_size; ///< Maximum texture size
188  GLint max_viewport_width; ///< Maximum viewport size
189  GLint max_viewport_height; ///< Maximum viewport size
190  int non_pow_2_textures; ///< 1 when non power of 2 textures are supported
191  int unpack_subimage; ///< 1 when GL_EXT_unpack_subimage is available
192 
193  /* Current OpenGL configuration */
194  GLuint program; ///< Shader program
195  GLuint vertex_shader; ///< Vertex shader
196  GLuint fragment_shader; ///< Fragment shader for current pix_pmt
197  GLuint texture_name[4]; ///< Textures' IDs
198  GLuint index_buffer; ///< Index buffer
199  GLuint vertex_buffer; ///< Vertex buffer
200  OpenGLVertexInfo vertex[4]; ///< VBO
201  GLint projection_matrix_location; ///< Uniforms' locations
202  GLint model_view_matrix_location;
203  GLint color_map_location;
204  GLint chroma_div_w_location;
205  GLint chroma_div_h_location;
206  GLint texture_location[4];
207  GLint position_attrib; ///< Attibutes' locations
208  GLint texture_coords_attrib;
209 
210  GLfloat projection_matrix[16]; ///< Projection matrix
211  GLfloat model_view_matrix[16]; ///< Modev view matrix
212  GLfloat color_map[16]; ///< RGBA color map matrix
213  GLfloat chroma_div_w; ///< Chroma subsampling w ratio
214  GLfloat chroma_div_h; ///< Chroma subsampling h ratio
215 
216  /* Stream information */
217  GLenum format;
218  GLenum type;
219  int width; ///< Stream width
220  int height; ///< Stream height
221  enum AVPixelFormat pix_fmt; ///< Stream pixel format
222  int picture_width; ///< Rendered width
223  int picture_height; ///< Rendered height
224  int window_width;
225  int window_height;
226 } OpenGLContext;
227 
228 static const struct OpenGLFormatDesc {
229  enum AVPixelFormat fixel_format;
230  const char * const * fragment_shader;
231  GLenum format;
232  GLenum type;
233 } opengl_format_desc[] = {
234  { AV_PIX_FMT_YUV420P, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
235  { AV_PIX_FMT_YUV444P, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
236  { AV_PIX_FMT_YUV422P, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
237  { AV_PIX_FMT_YUV410P, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
238  { AV_PIX_FMT_YUV411P, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
239  { AV_PIX_FMT_YUV440P, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
240  { AV_PIX_FMT_YUV420P16, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
241  { AV_PIX_FMT_YUV422P16, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
242  { AV_PIX_FMT_YUV444P16, &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
243  { AV_PIX_FMT_YUVA420P, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
244  { AV_PIX_FMT_YUVA444P, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
245  { AV_PIX_FMT_YUVA422P, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
246  { AV_PIX_FMT_YUVA420P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
247  { AV_PIX_FMT_YUVA422P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
248  { AV_PIX_FMT_YUVA444P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
249  { AV_PIX_FMT_RGB24, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGB, GL_UNSIGNED_BYTE },
250  { AV_PIX_FMT_BGR24, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGB, GL_UNSIGNED_BYTE },
251  { AV_PIX_FMT_0RGB, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
252  { AV_PIX_FMT_RGB0, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
253  { AV_PIX_FMT_0BGR, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
254  { AV_PIX_FMT_BGR0, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
255  { AV_PIX_FMT_RGB565, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGB, GL_UNSIGNED_SHORT_5_6_5 },
256  { AV_PIX_FMT_BGR565, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGB, GL_UNSIGNED_SHORT_5_6_5 },
257  { AV_PIX_FMT_RGB555, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGBA, FF_GL_UNSIGNED_SHORT_1_5_5_5_REV },
258  { AV_PIX_FMT_BGR555, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGBA, FF_GL_UNSIGNED_SHORT_1_5_5_5_REV },
259  { AV_PIX_FMT_RGB8, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGB, FF_GL_UNSIGNED_BYTE_3_3_2 },
260  { AV_PIX_FMT_BGR8, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGB, FF_GL_UNSIGNED_BYTE_2_3_3_REV },
261  { AV_PIX_FMT_RGB48, &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET, GL_RGB, GL_UNSIGNED_SHORT },
262  { AV_PIX_FMT_ARGB, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
263  { AV_PIX_FMT_RGBA, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
264  { AV_PIX_FMT_ABGR, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
265  { AV_PIX_FMT_BGRA, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
266  { AV_PIX_FMT_RGBA64, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_SHORT },
267  { AV_PIX_FMT_BGRA64, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_SHORT },
268  { AV_PIX_FMT_GBRP, &FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
269  { AV_PIX_FMT_GBRP16, &FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
270  { AV_PIX_FMT_GBRAP, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
271  { AV_PIX_FMT_GBRAP16, &FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
272  { AV_PIX_FMT_GRAY8, &FF_OPENGL_FRAGMENT_SHADER_GRAY, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
273  { AV_PIX_FMT_GRAY16, &FF_OPENGL_FRAGMENT_SHADER_GRAY, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
274  { AV_PIX_FMT_NONE, NULL }
275 };
276 
277 static av_cold int opengl_prepare_vertex(AVFormatContext *s);
278 static int opengl_draw(AVFormatContext *h, void *intput, int repaint, int is_pkt);
279 static av_cold int opengl_init_context(OpenGLContext *opengl);
280 
281 static av_cold void opengl_deinit_context(OpenGLContext *opengl)
282 {
283  glDeleteTextures(4, opengl->texture_name);
284  opengl->texture_name[0] = opengl->texture_name[1] =
285  opengl->texture_name[2] = opengl->texture_name[3] = 0;
286  if (opengl->glprocs.glUseProgram)
287  opengl->glprocs.glUseProgram(0);
288  if (opengl->glprocs.glDeleteProgram) {
289  opengl->glprocs.glDeleteProgram(opengl->program);
290  opengl->program = 0;
291  }
292  if (opengl->glprocs.glDeleteShader) {
293  opengl->glprocs.glDeleteShader(opengl->vertex_shader);
294  opengl->glprocs.glDeleteShader(opengl->fragment_shader);
295  opengl->vertex_shader = opengl->fragment_shader = 0;
296  }
297  if (opengl->glprocs.glBindBuffer) {
298  opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, 0);
299  opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, 0);
300  }
301  if (opengl->glprocs.glDeleteBuffers) {
302  opengl->glprocs.glDeleteBuffers(2, &opengl->index_buffer);
303  opengl->vertex_buffer = opengl->index_buffer = 0;
304  }
305 }
306 
307 static int opengl_resize(AVFormatContext *h, int width, int height)
308 {
309  int ret = 0;
310  OpenGLContext *opengl = h->priv_data;
311  opengl->window_width = width;
312  opengl->window_height = height;
313  if (opengl->inited) {
314  if (opengl->no_window &&
315  (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {
316  av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
317  goto end;
318  }
319  if ((ret = opengl_prepare_vertex(h)) < 0)
320  goto end;
321  ret = opengl_draw(h, NULL, 1, 0);
322  }
323  end:
324  return ret;
325 }
326 
327 static int opengl_control_message(AVFormatContext *h, int type, void *data, size_t data_size)
328 {
329  OpenGLContext *opengl = h->priv_data;
330  switch(type) {
331  case AV_APP_TO_DEV_WINDOW_SIZE:
332  if (data) {
333  AVDeviceRect *message = data;
334  return opengl_resize(h, message->width, message->height);
335  }
336  return AVERROR(EINVAL);
337  case AV_APP_TO_DEV_WINDOW_REPAINT:
338  return opengl_resize(h, opengl->window_width, opengl->window_height);
339  }
340  return AVERROR(ENOSYS);
341 }
342 
343 #if HAVE_SDL
344 static int opengl_sdl_recreate_window(OpenGLContext *opengl, int width, int height)
345 {
346  opengl->surface = SDL_SetVideoMode(width, height,
347  32, SDL_OPENGL | SDL_RESIZABLE);
348  if (!opengl->surface) {
349  av_log(opengl, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
350  return AVERROR_EXTERNAL;
351  }
352  SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
353  SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
354  SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
355  SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
356  SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
357  return 0;
358 }
359 
360 static int opengl_sdl_process_events(AVFormatContext *h)
361 {
362  int ret;
363  OpenGLContext *opengl = h->priv_data;
364  SDL_Event event;
365  SDL_PumpEvents();
366  while (SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_ALLEVENTS) > 0) {
367  switch (event.type) {
368  case SDL_QUIT:
369  return AVERROR(EIO);
370  case SDL_KEYDOWN:
371  switch (event.key.keysym.sym) {
372  case SDLK_ESCAPE:
373  case SDLK_q:
374  return AVERROR(EIO);
375  }
376  return 0;
377  case SDL_VIDEORESIZE: {
378  char buffer[100];
379  int reinit;
380  AVDeviceRect message;
381  /* clean up old context because SDL_SetVideoMode may lose its state. */
382  SDL_VideoDriverName(buffer, sizeof(buffer));
383  reinit = !av_strncasecmp(buffer, "quartz", sizeof(buffer));
384  if (reinit) {
385  opengl_deinit_context(opengl);
386  }
387  if ((ret = opengl_sdl_recreate_window(opengl, event.resize.w, event.resize.h)) < 0)
388  return ret;
389  if (reinit && (ret = opengl_init_context(opengl)) < 0)
390  return ret;
391  message.width = opengl->surface->w;
392  message.height = opengl->surface->h;
393  return opengl_control_message(h, AV_APP_TO_DEV_WINDOW_SIZE, &message, sizeof(AVDeviceRect));
394  }
395  }
396  }
397  return 0;
398 }
399 
400 static int av_cold opengl_sdl_create_window(AVFormatContext *h)
401 {
402  int ret;
403  char buffer[100];
404  OpenGLContext *opengl = h->priv_data;
405  AVDeviceRect message;
406  if (SDL_Init(SDL_INIT_VIDEO)) {
407  av_log(opengl, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
408  return AVERROR_EXTERNAL;
409  }
410  if ((ret = opengl_sdl_recreate_window(opengl, opengl->window_width,
411  opengl->window_height)) < 0)
412  return ret;
413  av_log(opengl, AV_LOG_INFO, "SDL driver: '%s'.\n", SDL_VideoDriverName(buffer, sizeof(buffer)));
414  message.width = opengl->surface->w;
415  message.height = opengl->surface->h;
416  SDL_WM_SetCaption(opengl->window_title, NULL);
417  opengl_control_message(h, AV_APP_TO_DEV_WINDOW_SIZE, &message, sizeof(AVDeviceRect));
418  return 0;
419 }
420 
421 static int av_cold opengl_sdl_load_procedures(OpenGLContext *opengl)
422 {
423  FFOpenGLFunctions *procs = &opengl->glprocs;
424 
425 #define LOAD_OPENGL_FUN(name, type) \
426  procs->name = (type)SDL_GL_GetProcAddress(#name); \
427  if (!procs->name) { \
428  av_log(opengl, AV_LOG_ERROR, "Cannot load OpenGL function: '%s'\n", #name); \
429  return AVERROR(ENOSYS); \
430  }
431 
432  LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)
433  LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)
434  LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)
435  LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)
436  LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)
437  LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)
438  LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)
439  LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)
440  LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)
441  LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)
442  LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)
443  LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)
444  LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)
445  LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)
446  LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)
447  LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)
448  LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)
449  LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)
450  LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)
451  LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)
452  LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)
453  LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)
454  LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)
455  LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)
456  LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)
457 
458  return 0;
459 
460 #undef LOAD_OPENGL_FUN
461 }
462 #endif /* HAVE_SDL */
463 
464 #if defined(__APPLE__)
465 static int av_cold opengl_load_procedures(OpenGLContext *opengl)
466 {
467  FFOpenGLFunctions *procs = &opengl->glprocs;
468 
469 #if HAVE_SDL
470  if (!opengl->no_window)
471  return opengl_sdl_load_procedures(opengl);
472 #endif
473 
474  procs->glActiveTexture = glActiveTexture;
475  procs->glGenBuffers = glGenBuffers;
476  procs->glDeleteBuffers = glDeleteBuffers;
477  procs->glBufferData = glBufferData;
478  procs->glBindBuffer = glBindBuffer;
479  procs->glGetAttribLocation = glGetAttribLocation;
480  procs->glGetUniformLocation = glGetUniformLocation;
481  procs->glUniform1f = glUniform1f;
482  procs->glUniform1i = glUniform1i;
483  procs->glUniformMatrix4fv = glUniformMatrix4fv;
484  procs->glCreateProgram = glCreateProgram;
485  procs->glDeleteProgram = glDeleteProgram;
486  procs->glUseProgram = glUseProgram;
487  procs->glLinkProgram = glLinkProgram;
488  procs->glGetProgramiv = glGetProgramiv;
489  procs->glGetProgramInfoLog = glGetProgramInfoLog;
490  procs->glAttachShader = glAttachShader;
491  procs->glCreateShader = glCreateShader;
492  procs->glDeleteShader = glDeleteShader;
493  procs->glCompileShader = glCompileShader;
494  procs->glShaderSource = glShaderSource;
495  procs->glGetShaderiv = glGetShaderiv;
496  procs->glGetShaderInfoLog = glGetShaderInfoLog;
497  procs->glEnableVertexAttribArray = glEnableVertexAttribArray;
498  procs->glVertexAttribPointer = (FF_PFNGLVERTEXATTRIBPOINTERPROC) glVertexAttribPointer;
499  return 0;
500 }
501 #else
502 static int av_cold opengl_load_procedures(OpenGLContext *opengl)
503 {
504  FFOpenGLFunctions *procs = &opengl->glprocs;
505 
506 #if HAVE_GLXGETPROCADDRESS
507 #define SelectedGetProcAddress glXGetProcAddress
508 #elif HAVE_WGLGETPROCADDRESS
509 #define SelectedGetProcAddress wglGetProcAddress
510 #endif
511 
512 #define LOAD_OPENGL_FUN(name, type) \
513  procs->name = (type)SelectedGetProcAddress(#name); \
514  if (!procs->name) { \
515  av_log(opengl, AV_LOG_ERROR, "Cannot load OpenGL function: '%s'\n", #name); \
516  return AVERROR(ENOSYS); \
517  }
518 
519 #if HAVE_SDL
520  if (!opengl->no_window)
521  return opengl_sdl_load_procedures(opengl);
522 #endif
523 
524  LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)
525  LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)
526  LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)
527  LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)
528  LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)
529  LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)
530  LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)
531  LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)
532  LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)
533  LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)
534  LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)
535  LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)
536  LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)
537  LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)
538  LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)
539  LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)
540  LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)
541  LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)
542  LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)
543  LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)
544  LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)
545  LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)
546  LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)
547  LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)
548  LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)
549 
550  return 0;
551 
552 #undef SelectedGetProcAddress
553 #undef LOAD_OPENGL_FUN
554 }
555 #endif
556 
557 static void opengl_make_identity(float matrix[16])
558 {
559  memset(matrix, 0, 16 * sizeof(float));
560  matrix[0] = matrix[5] = matrix[10] = matrix[15] = 1.0f;
561 }
562 
563 static void opengl_make_ortho(float matrix[16], float left, float right,
564  float bottom, float top, float nearZ, float farZ)
565 {
566  float ral = right + left;
567  float rsl = right - left;
568  float tab = top + bottom;
569  float tsb = top - bottom;
570  float fan = farZ + nearZ;
571  float fsn = farZ - nearZ;
572 
573  memset(matrix, 0, 16 * sizeof(float));
574  matrix[0] = 2.0f / rsl;
575  matrix[5] = 2.0f / tsb;
576  matrix[10] = -2.0f / fsn;
577  matrix[12] = -ral / rsl;
578  matrix[13] = -tab / tsb;
579  matrix[14] = -fan / fsn;
580  matrix[15] = 1.0f;
581 }
582 
583 static av_cold int opengl_read_limits(OpenGLContext *opengl)
584 {
585  static const struct{
586  const char *extension;
587  int major;
588  int minor;
589  } required_extensions[] = {
590  { "GL_ARB_multitexture", 1, 3 },
591  { "GL_ARB_vertex_buffer_object", 1, 5 }, //GLX_ARB_vertex_buffer_object
592  { "GL_ARB_vertex_shader", 2, 0 },
593  { "GL_ARB_fragment_shader", 2, 0 },
594  { "GL_ARB_shader_objects", 2, 0 },
595  { NULL, 0, 0 }
596  };
597  int i, major, minor;
598  const char *extensions, *version;
599 
600  version = glGetString(GL_VERSION);
601  extensions = glGetString(GL_EXTENSIONS);
602 
603  av_log(opengl, AV_LOG_DEBUG, "OpenGL version: %s\n", version);
604  sscanf(version, "%d.%d", &major, &minor);
605 
606  for (i = 0; required_extensions[i].extension; i++) {
607  if (major < required_extensions[i].major &&
608  (major == required_extensions[i].major && minor < required_extensions[i].minor) &&
609  !strstr(extensions, required_extensions[i].extension)) {
610  av_log(opengl, AV_LOG_ERROR, "Required extension %s is not supported.\n",
611  required_extensions[i].extension);
612  av_log(opengl, AV_LOG_DEBUG, "Supported extensions are: %s\n", extensions);
613  return AVERROR(ENOSYS);
614  }
615  }
616  glGetIntegerv(GL_MAX_TEXTURE_SIZE, &opengl->max_texture_size);
617  glGetIntegerv(GL_MAX_VIEWPORT_DIMS, &opengl->max_viewport_width);
618  opengl->non_pow_2_textures = major >= 2 || strstr(extensions, "GL_ARB_texture_non_power_of_two");
619 #if defined(GL_ES_VERSION_2_0)
620  opengl->unpack_subimage = !!strstr(extensions, "GL_EXT_unpack_subimage");
621 #else
622  opengl->unpack_subimage = 1;
623 #endif
624 
625  av_log(opengl, AV_LOG_DEBUG, "Non Power of 2 textures support: %s\n", opengl->non_pow_2_textures ? "Yes" : "No");
626  av_log(opengl, AV_LOG_DEBUG, "Unpack Subimage extension support: %s\n", opengl->unpack_subimage ? "Yes" : "No");
627  av_log(opengl, AV_LOG_DEBUG, "Max texture size: %dx%d\n", opengl->max_texture_size, opengl->max_texture_size);
628  av_log(opengl, AV_LOG_DEBUG, "Max viewport size: %dx%d\n",
629  opengl->max_viewport_width, opengl->max_viewport_height);
630 
631  OPENGL_ERROR_CHECK(opengl);
632  return 0;
633  fail:
634  return AVERROR_EXTERNAL;
635 }
636 
637 static const char* opengl_get_fragment_shader_code(enum AVPixelFormat format)
638 {
639  int i;
640  for (i = 0; i < FF_ARRAY_ELEMS(opengl_format_desc); i++) {
641  if (opengl_format_desc[i].fixel_format == format)
642  return *opengl_format_desc[i].fragment_shader;
643  }
644  return NULL;
645 }
646 
647 static int opengl_type_size(GLenum type)
648 {
649  switch(type) {
650  case GL_UNSIGNED_SHORT:
651  case FF_GL_UNSIGNED_SHORT_1_5_5_5_REV:
652  case GL_UNSIGNED_SHORT_5_6_5:
653  return 2;
654  case GL_UNSIGNED_BYTE:
655  case FF_GL_UNSIGNED_BYTE_3_3_2:
656  case FF_GL_UNSIGNED_BYTE_2_3_3_REV:
657  default:
658  break;
659  }
660  return 1;
661 }
662 
663 static av_cold void opengl_get_texture_params(OpenGLContext *opengl)
664 {
665  int i;
666  for (i = 0; i < FF_ARRAY_ELEMS(opengl_format_desc); i++) {
667  if (opengl_format_desc[i].fixel_format == opengl->pix_fmt) {
668  opengl->format = opengl_format_desc[i].format;
669  opengl->type = opengl_format_desc[i].type;
670  break;
671  }
672  }
673 }
674 
675 static void opengl_compute_display_area(AVFormatContext *s)
676 {
677  AVRational sar, dar; /* sample and display aspect ratios */
678  OpenGLContext *opengl = s->priv_data;
679  AVStream *st = s->streams[0];
680  AVCodecContext *encctx = st->codec;
681 
682  /* compute overlay width and height from the codec context information */
683  sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
684  dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });
685 
686  /* we suppose the screen has a 1/1 sample aspect ratio */
687  /* fit in the window */
688  if (av_cmp_q(dar, (AVRational){ opengl->window_width, opengl->window_height }) > 0) {
689  /* fit in width */
690  opengl->picture_width = opengl->window_width;
691  opengl->picture_height = av_rescale(opengl->picture_width, dar.den, dar.num);
692  } else {
693  /* fit in height */
694  opengl->picture_height = opengl->window_height;
695  opengl->picture_width = av_rescale(opengl->picture_height, dar.num, dar.den);
696  }
697 }
698 
699 static av_cold void opengl_get_texture_size(OpenGLContext *opengl, int in_width, int in_height,
700  int *out_width, int *out_height)
701 {
702  if (opengl->non_pow_2_textures) {
703  *out_width = in_width;
704  *out_height = in_height;
705  } else {
706  int max = FFMIN(FFMAX(in_width, in_height), opengl->max_texture_size);
707  unsigned power_of_2 = 1;
708  while (power_of_2 < max)
709  power_of_2 *= 2;
710  *out_height = power_of_2;
711  *out_width = power_of_2;
712  av_log(opengl, AV_LOG_DEBUG, "Texture size calculated from %dx%d into %dx%d\n",
713  in_width, in_height, *out_width, *out_height);
714  }
715 }
716 
717 static av_cold void opengl_fill_color_map(OpenGLContext *opengl)
718 {
719  const AVPixFmtDescriptor *desc;
720  int shift;
721  enum AVPixelFormat pix_fmt = opengl->pix_fmt;
722 
723  /* We need order of components, not exact position, some minor HACKs here */
724  if (pix_fmt == AV_PIX_FMT_RGB565 || pix_fmt == AV_PIX_FMT_BGR555 ||
725  pix_fmt == AV_PIX_FMT_BGR8 || pix_fmt == AV_PIX_FMT_RGB8)
726  pix_fmt = AV_PIX_FMT_RGB24;
727  else if (pix_fmt == AV_PIX_FMT_BGR565 || pix_fmt == AV_PIX_FMT_RGB555)
728  pix_fmt = AV_PIX_FMT_BGR24;
729 
730  desc = av_pix_fmt_desc_get(pix_fmt);
731  if (!(desc->flags & AV_PIX_FMT_FLAG_RGB))
732  return;
733 
734 #define FILL_COMPONENT(i) { \
735  shift = desc->comp[i].depth_minus1 >> 3; \
736  opengl->color_map[(i << 2) + ((desc->comp[i].offset_plus1 - 1) >> shift)] = 1.0; \
737  }
738 
739  memset(opengl->color_map, 0, sizeof(opengl->color_map));
740  FILL_COMPONENT(0);
741  FILL_COMPONENT(1);
742  FILL_COMPONENT(2);
743  if (desc->flags & AV_PIX_FMT_FLAG_ALPHA)
744  FILL_COMPONENT(3);
745 
746 #undef FILL_COMPONENT
747 }
748 
749 static av_cold GLuint opengl_load_shader(OpenGLContext *opengl, GLenum type, const char *source)
750 {
751  GLuint shader = opengl->glprocs.glCreateShader(type);
752  GLint result;
753  if (!shader) {
754  av_log(opengl, AV_LOG_ERROR, "glCreateShader() failed\n");
755  return 0;
756  }
757  opengl->glprocs.glShaderSource(shader, 1, &source, NULL);
758  opengl->glprocs.glCompileShader(shader);
759 
760  opengl->glprocs.glGetShaderiv(shader, FF_GL_COMPILE_STATUS, &result);
761  if (!result) {
762  char *log;
763  opengl->glprocs.glGetShaderiv(shader, FF_GL_INFO_LOG_LENGTH, &result);
764  if (result) {
765  if ((log = av_malloc(result))) {
766  opengl->glprocs.glGetShaderInfoLog(shader, result, NULL, log);
767  av_log(opengl, AV_LOG_ERROR, "Compile error: %s\n", log);
768  av_free(log);
769  }
770  }
771  goto fail;
772  }
773  OPENGL_ERROR_CHECK(opengl);
774  return shader;
775  fail:
776  opengl->glprocs.glDeleteShader(shader);
777  return 0;
778 }
779 
780 static av_cold int opengl_compile_shaders(OpenGLContext *opengl, enum AVPixelFormat pix_fmt)
781 {
782  GLint result;
783  const char *fragment_shader_code = opengl_get_fragment_shader_code(pix_fmt);
784 
785  if (!fragment_shader_code) {
786  av_log(opengl, AV_LOG_ERROR, "Provided pixel format '%s' is not supported\n",
787  av_get_pix_fmt_name(pix_fmt));
788  return AVERROR(EINVAL);
789  }
790 
791  opengl->vertex_shader = opengl_load_shader(opengl, FF_GL_VERTEX_SHADER,
792  FF_OPENGL_VERTEX_SHADER);
793  if (!opengl->vertex_shader) {
794  av_log(opengl, AV_LOG_ERROR, "Vertex shader loading failed.\n");
795  goto fail;
796  }
797  opengl->fragment_shader = opengl_load_shader(opengl, FF_GL_FRAGMENT_SHADER,
798  fragment_shader_code);
799  if (!opengl->fragment_shader) {
800  av_log(opengl, AV_LOG_ERROR, "Fragment shader loading failed.\n");
801  goto fail;
802  }
803 
804  opengl->program = opengl->glprocs.glCreateProgram();
805  if (!opengl->program)
806  goto fail;
807 
808  opengl->glprocs.glAttachShader(opengl->program, opengl->vertex_shader);
809  opengl->glprocs.glAttachShader(opengl->program, opengl->fragment_shader);
810  opengl->glprocs.glLinkProgram(opengl->program);
811 
812  opengl->glprocs.glGetProgramiv(opengl->program, FF_GL_LINK_STATUS, &result);
813  if (!result) {
814  char *log;
815  opengl->glprocs.glGetProgramiv(opengl->program, FF_GL_INFO_LOG_LENGTH, &result);
816  if (result) {
817  log = av_malloc(result);
818  if (!log)
819  goto fail;
820  opengl->glprocs.glGetProgramInfoLog(opengl->program, result, NULL, log);
821  av_log(opengl, AV_LOG_ERROR, "Link error: %s\n", log);
822  av_free(log);
823  }
824  goto fail;
825  }
826 
827  opengl->position_attrib = opengl->glprocs.glGetAttribLocation(opengl->program, "a_position");
828  opengl->texture_coords_attrib = opengl->glprocs.glGetAttribLocation(opengl->program, "a_textureCoords");
829  opengl->projection_matrix_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_projectionMatrix");
830  opengl->model_view_matrix_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_modelViewMatrix");
831  opengl->color_map_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_colorMap");
832  opengl->texture_location[0] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture0");
833  opengl->texture_location[1] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture1");
834  opengl->texture_location[2] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture2");
835  opengl->texture_location[3] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture3");
836  opengl->chroma_div_w_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_chroma_div_w");
837  opengl->chroma_div_h_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_chroma_div_h");
838 
839  OPENGL_ERROR_CHECK(opengl);
840  return 0;
841  fail:
842  opengl->glprocs.glDeleteShader(opengl->vertex_shader);
843  opengl->glprocs.glDeleteShader(opengl->fragment_shader);
844  opengl->glprocs.glDeleteProgram(opengl->program);
845  opengl->fragment_shader = opengl->vertex_shader = opengl->program = 0;
846  return AVERROR_EXTERNAL;
847 }
848 
849 static av_cold int opengl_configure_texture(OpenGLContext *opengl, GLuint texture,
850  GLsizei width, GLsizei height)
851 {
852  if (texture) {
853  int new_width, new_height;
854  opengl_get_texture_size(opengl, width, height, &new_width, &new_height);
855  glBindTexture(GL_TEXTURE_2D, texture);
856  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
857  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
858  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
859  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
860  glTexImage2D(GL_TEXTURE_2D, 0, opengl->format, new_width, new_height, 0,
861  opengl->format, opengl->type, NULL);
862  OPENGL_ERROR_CHECK(NULL);
863  }
864  return 0;
865  fail:
866  return AVERROR_EXTERNAL;
867 }
868 
869 static av_cold int opengl_prepare_vertex(AVFormatContext *s)
870 {
871  OpenGLContext *opengl = s->priv_data;
872  int tex_w, tex_h;
873 
874  if (opengl->window_width > opengl->max_viewport_width || opengl->window_height > opengl->max_viewport_height) {
875  opengl->window_width = FFMIN(opengl->window_width, opengl->max_viewport_width);
876  opengl->window_height = FFMIN(opengl->window_height, opengl->max_viewport_height);
877  av_log(opengl, AV_LOG_WARNING, "Too big viewport requested, limited to %dx%d", opengl->window_width, opengl->window_height);
878  }
879  glViewport(0, 0, opengl->window_width, opengl->window_height);
880  opengl_make_ortho(opengl->projection_matrix,
881  - (float)opengl->window_width / 2.0f, (float)opengl->window_width / 2.0f,
882  - (float)opengl->window_height / 2.0f, (float)opengl->window_height / 2.0f,
883  1.0f, -1.0f);
884  opengl_make_identity(opengl->model_view_matrix);
885 
886  opengl_compute_display_area(s);
887 
888  opengl->vertex[0].z = opengl->vertex[1].z = opengl->vertex[2].z = opengl->vertex[3].z = 0.0f;
889  opengl->vertex[0].x = opengl->vertex[1].x = - (float)opengl->picture_width / 2.0f;
890  opengl->vertex[2].x = opengl->vertex[3].x = (float)opengl->picture_width / 2.0f;
891  opengl->vertex[1].y = opengl->vertex[2].y = - (float)opengl->picture_height / 2.0f;
892  opengl->vertex[0].y = opengl->vertex[3].y = (float)opengl->picture_height / 2.0f;
893 
894  opengl_get_texture_size(opengl, opengl->width, opengl->height, &tex_w, &tex_h);
895 
896  opengl->vertex[0].s0 = 0.0f;
897  opengl->vertex[0].t0 = 0.0f;
898  opengl->vertex[1].s0 = 0.0f;
899  opengl->vertex[1].t0 = (float)opengl->height / (float)tex_h;
900  opengl->vertex[2].s0 = (float)opengl->width / (float)tex_w;
901  opengl->vertex[2].t0 = (float)opengl->height / (float)tex_h;
902  opengl->vertex[3].s0 = (float)opengl->width / (float)tex_w;
903  opengl->vertex[3].t0 = 0.0f;
904 
905  opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);
906  opengl->glprocs.glBufferData(FF_GL_ARRAY_BUFFER, sizeof(opengl->vertex), opengl->vertex, FF_GL_STATIC_DRAW);
907  opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, 0);
908  OPENGL_ERROR_CHECK(opengl);
909  return 0;
910  fail:
911  return AVERROR_EXTERNAL;
912 }
913 
914 static int opengl_prepare(OpenGLContext *opengl)
915 {
916  int i;
917  opengl->glprocs.glUseProgram(opengl->program);
918  opengl->glprocs.glUniformMatrix4fv(opengl->projection_matrix_location, 1, GL_FALSE, opengl->projection_matrix);
919  opengl->glprocs.glUniformMatrix4fv(opengl->model_view_matrix_location, 1, GL_FALSE, opengl->model_view_matrix);
920  for (i = 0; i < 4; i++)
921  if (opengl->texture_location[i] != -1) {
922  opengl->glprocs.glActiveTexture(GL_TEXTURE0 + i);
923  glBindTexture(GL_TEXTURE_2D, opengl->texture_name[i]);
924  opengl->glprocs.glUniform1i(opengl->texture_location[i], i);
925  }
926  if (opengl->color_map_location != -1)
927  opengl->glprocs.glUniformMatrix4fv(opengl->color_map_location, 1, GL_FALSE, opengl->color_map);
928  if (opengl->chroma_div_h_location != -1)
929  opengl->glprocs.glUniform1f(opengl->chroma_div_h_location, opengl->chroma_div_h);
930  if (opengl->chroma_div_w_location != -1)
931  opengl->glprocs.glUniform1f(opengl->chroma_div_w_location, opengl->chroma_div_w);
932 
933  OPENGL_ERROR_CHECK(opengl);
934  return 0;
935  fail:
936  return AVERROR_EXTERNAL;
937 }
938 
939 static int opengl_create_window(AVFormatContext *h)
940 {
941  OpenGLContext *opengl = h->priv_data;
942  int ret;
943 
944  if (!opengl->no_window) {
945 #if HAVE_SDL
946  if ((ret = opengl_sdl_create_window(h)) < 0) {
947  av_log(opengl, AV_LOG_ERROR, "Cannot create default SDL window.\n");
948  return ret;
949  }
950 #else
951  av_log(opengl, AV_LOG_ERROR, "FFmpeg is compiled without SDL. Cannot create default window.\n");
952  return AVERROR(ENOSYS);
953 #endif
954  } else {
955  AVDeviceRect message;
956  message.x = message.y = 0;
957  message.width = opengl->window_width;
958  message.height = opengl->window_height;
959  if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_CREATE_WINDOW_BUFFER,
960  &message , sizeof(message))) < 0) {
961  av_log(opengl, AV_LOG_ERROR, "Application failed to create window buffer.\n");
962  return ret;
963  }
964  if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {
965  av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
966  return ret;
967  }
968  }
969  return 0;
970 }
971 
972 static int opengl_release_window(AVFormatContext *h)
973 {
974  int ret;
975  OpenGLContext *opengl = h->priv_data;
976  if (!opengl->no_window) {
977 #if HAVE_SDL
978  SDL_Quit();
979 #endif
980  } else if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER, NULL , 0)) < 0) {
981  av_log(opengl, AV_LOG_ERROR, "Application failed to release window buffer.\n");
982  return ret;
983  }
984  return 0;
985 }
986 
987 static av_cold int opengl_write_trailer(AVFormatContext *h)
988 {
989  OpenGLContext *opengl = h->priv_data;
990 
991  if (opengl->no_window &&
992  avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0) < 0)
993  av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
994 
995  opengl_deinit_context(opengl);
996  opengl_release_window(h);
997 
998  return 0;
999 }
1000 
1001 static av_cold int opengl_init_context(OpenGLContext *opengl)
1002 {
1003  int i, ret;
1004  const AVPixFmtDescriptor *desc;
1005 
1006  if ((ret = opengl_compile_shaders(opengl, opengl->pix_fmt)) < 0)
1007  goto fail;
1008 
1009  desc = av_pix_fmt_desc_get(opengl->pix_fmt);
1010  av_assert0(desc->nb_components > 0 && desc->nb_components <= 4);
1011  glGenTextures(desc->nb_components, opengl->texture_name);
1012 
1013  opengl->glprocs.glGenBuffers(2, &opengl->index_buffer);
1014  if (!opengl->index_buffer || !opengl->vertex_buffer) {
1015  av_log(opengl, AV_LOG_ERROR, "Buffer generation failed.\n");
1016  ret = AVERROR_EXTERNAL;
1017  goto fail;
1018  }
1019 
1020  opengl_configure_texture(opengl, opengl->texture_name[0], opengl->width, opengl->height);
1021  if (desc->nb_components > 1) {
1022  int has_alpha = desc->flags & AV_PIX_FMT_FLAG_ALPHA;
1023  int num_planes = desc->nb_components - (has_alpha ? 1 : 0);
1024  if (opengl->non_pow_2_textures) {
1025  opengl->chroma_div_w = 1.0f;
1026  opengl->chroma_div_h = 1.0f;
1027  } else {
1028  opengl->chroma_div_w = 1 << desc->log2_chroma_w;
1029  opengl->chroma_div_h = 1 << desc->log2_chroma_h;
1030  }
1031  for (i = 1; i < num_planes; i++)
1032  if (opengl->non_pow_2_textures)
1033  opengl_configure_texture(opengl, opengl->texture_name[i],
1034  FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w),
1035  FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h));
1036  else
1037  opengl_configure_texture(opengl, opengl->texture_name[i], opengl->width, opengl->height);
1038  if (has_alpha)
1039  opengl_configure_texture(opengl, opengl->texture_name[3], opengl->width, opengl->height);
1040  }
1041 
1042  opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);
1043  opengl->glprocs.glBufferData(FF_GL_ELEMENT_ARRAY_BUFFER, sizeof(g_index), g_index, FF_GL_STATIC_DRAW);
1044  opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, 0);
1045 
1046  glEnable(GL_BLEND);
1047  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1048 
1049  glClearColor((float)opengl->background[0] / 255.0f, (float)opengl->background[1] / 255.0f,
1050  (float)opengl->background[2] / 255.0f, 1.0f);
1051 
1052  ret = AVERROR_EXTERNAL;
1053  OPENGL_ERROR_CHECK(opengl);
1054 
1055  return 0;
1056  fail:
1057  return ret;
1058 }
1059 
1060 static av_cold int opengl_write_header(AVFormatContext *h)
1061 {
1062  OpenGLContext *opengl = h->priv_data;
1063  AVStream *st;
1064  int ret;
1065 
1066  if (h->nb_streams != 1 ||
1067  h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO ||
1068  h->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
1069  av_log(opengl, AV_LOG_ERROR, "Only a single video stream is supported.\n");
1070  return AVERROR(EINVAL);
1071  }
1072  st = h->streams[0];
1073  opengl->width = st->codec->width;
1074  opengl->height = st->codec->height;
1075  opengl->pix_fmt = st->codec->pix_fmt;
1076  if (!opengl->window_width)
1077  opengl->window_width = opengl->width;
1078  if (!opengl->window_height)
1079  opengl->window_height = opengl->height;
1080 
1081  if (!opengl->window_title && !opengl->no_window)
1082  opengl->window_title = av_strdup(h->filename);
1083 
1084  if ((ret = opengl_create_window(h)))
1085  goto fail;
1086 
1087  if ((ret = opengl_read_limits(opengl)) < 0)
1088  goto fail;
1089 
1090  if (opengl->width > opengl->max_texture_size || opengl->height > opengl->max_texture_size) {
1091  av_log(opengl, AV_LOG_ERROR, "Too big picture %dx%d, max supported size is %dx%d\n",
1092  opengl->width, opengl->height, opengl->max_texture_size, opengl->max_texture_size);
1093  ret = AVERROR(EINVAL);
1094  goto fail;
1095  }
1096 
1097  if ((ret = opengl_load_procedures(opengl)) < 0)
1098  goto fail;
1099 
1100  opengl_fill_color_map(opengl);
1101  opengl_get_texture_params(opengl);
1102 
1103  if ((ret = opengl_init_context(opengl)) < 0)
1104  goto fail;
1105 
1106  if ((ret = opengl_prepare_vertex(h)) < 0)
1107  goto fail;
1108 
1109  glClear(GL_COLOR_BUFFER_BIT);
1110 
1111 #if HAVE_SDL
1112  if (!opengl->no_window)
1113  SDL_GL_SwapBuffers();
1114 #endif
1115  if (opengl->no_window &&
1116  (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {
1117  av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");
1118  goto fail;
1119  }
1120 
1121  ret = AVERROR_EXTERNAL;
1122  OPENGL_ERROR_CHECK(opengl);
1123 
1124  opengl->inited = 1;
1125  return 0;
1126 
1127  fail:
1128  opengl_write_trailer(h);
1129  return ret;
1130 }
1131 
1132 static uint8_t* opengl_get_plane_pointer(OpenGLContext *opengl, AVPacket *pkt, int comp_index,
1133  const AVPixFmtDescriptor *desc)
1134 {
1135  uint8_t *data = pkt->data;
1136  int wordsize = opengl_type_size(opengl->type);
1137  int width_chroma = FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);
1138  int height_chroma = FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);
1139  int plane = desc->comp[comp_index].plane;
1140 
1141  switch(plane) {
1142  case 0:
1143  break;
1144  case 1:
1145  data += opengl->width * opengl->height * wordsize;
1146  break;
1147  case 2:
1148  data += opengl->width * opengl->height * wordsize;
1149  data += width_chroma * height_chroma * wordsize;
1150  break;
1151  case 3:
1152  data += opengl->width * opengl->height * wordsize;
1153  data += 2 * width_chroma * height_chroma * wordsize;
1154  break;
1155  default:
1156  return NULL;
1157  }
1158  return data;
1159 }
1160 
1161 #define LOAD_TEXTURE_DATA(comp_index, sub) \
1162 { \
1163  int width = sub ? FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w) : opengl->width; \
1164  int height = sub ? FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h): opengl->height; \
1165  uint8_t *data; \
1166  int plane = desc->comp[comp_index].plane; \
1167  \
1168  glBindTexture(GL_TEXTURE_2D, opengl->texture_name[comp_index]); \
1169  if (!is_pkt) { \
1170  GLint length = ((AVFrame *)input)->linesize[plane]; \
1171  int bytes_per_pixel = opengl_type_size(opengl->type); \
1172  if (!(desc->flags & AV_PIX_FMT_FLAG_PLANAR)) \
1173  bytes_per_pixel *= desc->nb_components; \
1174  data = ((AVFrame *)input)->data[plane]; \
1175  if (!(length % bytes_per_pixel) && \
1176  (opengl->unpack_subimage || ((length / bytes_per_pixel) == width))) { \
1177  length /= bytes_per_pixel; \
1178  if (length != width) \
1179  glPixelStorei(FF_GL_UNPACK_ROW_LENGTH, length); \
1180  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, \
1181  opengl->format, opengl->type, data); \
1182  if (length != width) \
1183  glPixelStorei(FF_GL_UNPACK_ROW_LENGTH, 0); \
1184  } else { \
1185  int h; \
1186  for (h = 0; h < height; h++) { \
1187  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, h, width, 1, \
1188  opengl->format, opengl->type, data); \
1189  data += length; \
1190  } \
1191  } \
1192  } else { \
1193  data = opengl_get_plane_pointer(opengl, input, comp_index, desc); \
1194  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, \
1195  opengl->format, opengl->type, data); \
1196  } \
1197 }
1198 
1199 static int opengl_draw(AVFormatContext *h, void *input, int repaint, int is_pkt)
1200 {
1201  OpenGLContext *opengl = h->priv_data;
1202  enum AVPixelFormat pix_fmt = h->streams[0]->codec->pix_fmt;
1203  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
1204  int ret;
1205 
1206 #if HAVE_SDL
1207  if (!opengl->no_window && (ret = opengl_sdl_process_events(h)) < 0)
1208  goto fail;
1209 #endif
1210  if (opengl->no_window &&
1211  (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {
1212  av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
1213  goto fail;
1214  }
1215 
1216  glClear(GL_COLOR_BUFFER_BIT);
1217 
1218  if (!repaint) {
1219  if (is_pkt)
1220  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
1221  LOAD_TEXTURE_DATA(0, 0)
1222  if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {
1223  LOAD_TEXTURE_DATA(1, 1)
1224  LOAD_TEXTURE_DATA(2, 1)
1225  if (desc->flags & AV_PIX_FMT_FLAG_ALPHA)
1226  LOAD_TEXTURE_DATA(3, 0)
1227  }
1228  }
1229  ret = AVERROR_EXTERNAL;
1230  OPENGL_ERROR_CHECK(opengl);
1231 
1232  if ((ret = opengl_prepare(opengl)) < 0)
1233  goto fail;
1234 
1235  opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);
1236  opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);
1237  opengl->glprocs.glVertexAttribPointer(opengl->position_attrib, 3, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 0);
1238  opengl->glprocs.glEnableVertexAttribArray(opengl->position_attrib);
1239  opengl->glprocs.glVertexAttribPointer(opengl->texture_coords_attrib, 2, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 12);
1240  opengl->glprocs.glEnableVertexAttribArray(opengl->texture_coords_attrib);
1241 
1242  glDrawElements(GL_TRIANGLES, FF_ARRAY_ELEMS(g_index), GL_UNSIGNED_SHORT, 0);
1243 
1244  ret = AVERROR_EXTERNAL;
1245  OPENGL_ERROR_CHECK(opengl);
1246 
1247 #if HAVE_SDL
1248  if (!opengl->no_window)
1249  SDL_GL_SwapBuffers();
1250 #endif
1251  if (opengl->no_window &&
1252  (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {
1253  av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");
1254  goto fail;
1255  }
1256 
1257  return 0;
1258  fail:
1259  return ret;
1260 }
1261 
1262 static int opengl_write_packet(AVFormatContext *h, AVPacket *pkt)
1263 {
1264  return opengl_draw(h, pkt, 0, 1);
1265 }
1266 
1267 static int opengl_write_frame(AVFormatContext *h, int stream_index,
1268  AVFrame **frame, unsigned flags)
1269 {
1270  if ((flags & AV_WRITE_UNCODED_FRAME_QUERY))
1271  return 0;
1272  return opengl_draw(h, *frame, 0, 0);
1273 }
1274 
1275 #define OFFSET(x) offsetof(OpenGLContext, x)
1276 #define ENC AV_OPT_FLAG_ENCODING_PARAM
1277 static const AVOption options[] = {
1278  { "background", "set background color", OFFSET(background), AV_OPT_TYPE_COLOR, {.str = "black"}, CHAR_MIN, CHAR_MAX, ENC },
1279  { "no_window", "disable default window", OFFSET(no_window), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
1280  { "window_title", "set window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, ENC },
1281  { "window_size", "set window size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, ENC },
1282  { NULL }
1283 };
1284 
1285 static const AVClass opengl_class = {
1286  .class_name = "opengl outdev",
1287  .item_name = av_default_item_name,
1288  .option = options,
1289  .version = LIBAVUTIL_VERSION_INT,
1290  .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
1291 };
1292 
1293 AVOutputFormat ff_opengl_muxer = {
1294  .name = "opengl",
1295  .long_name = NULL_IF_CONFIG_SMALL("OpenGL output"),
1296  .priv_data_size = sizeof(OpenGLContext),
1297  .audio_codec = AV_CODEC_ID_NONE,
1298  .video_codec = AV_CODEC_ID_RAWVIDEO,
1299  .write_header = opengl_write_header,
1300  .write_packet = opengl_write_packet,
1301  .write_uncoded_frame = opengl_write_frame,
1302  .write_trailer = opengl_write_trailer,
1303  .control_message = opengl_control_message,
1304  .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
1305  .priv_class = &opengl_class,
1306 };
Generated on Sun Jul 20 2014 23:05:59 for FFmpeg by   doxygen 1.8.2