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FFmpeg/libavdevice/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_OPENGL_GL3_H

  34. #include <OpenGL/gl3.h>

  35. #elif HAVE_ES2_GL_H

  36. #include <ES2/gl.h>

  37. #else

  38. #include <GL/gl.h>

  39. #include <GL/glext.h>

  40. #endif

  41. #if HAVE_GLXGETPROCADDRESS

  42. #include <GL/glx.h>

  43. #endif

  44. #if HAVE_WINDOWS_H

  45. #include <windows.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 "libavdevice/avdevice.h"

  60. #include "opengl_enc_shaders.h"

  61. 

  62. #ifndef APIENTRY

  63. #define APIENTRY

  64. #endif

  65. 

  66. /* FF_GL_RED_COMPONENT is used for plannar pixel types.

  67.  * Only red component is sampled in shaders.

  68.  * On some platforms GL_RED is not availabe and GL_LUMINANCE have to be used,

  69.  * but since OpenGL 3.0 GL_LUMINANCE is deprecated.

  70.  * GL_RED produces RGBA = value, 0, 0, 1.

  71.  * GL_LUMINANCE produces RGBA = value, value, value, 1.

  72.  * Note: GL_INTENSITY may also be used which produce RGBA = value, value, value, value. */

  73. #if defined(GL_RED)

  74. #define FF_GL_RED_COMPONENT GL_RED

  75. #elif defined(GL_LUMINANCE)

  76. #define FF_GL_RED_COMPONENT GL_LUMINANCE

  77. #else

  78. #define FF_GL_RED_COMPONENT 0x1903; //GL_RED

  79. #endif

  80. 

  81. /* Constants not defined for iOS */

  82. #define FF_GL_UNSIGNED_BYTE_3_3_2 0x8032

  83. #define FF_GL_UNSIGNED_BYTE_2_3_3_REV 0x8362

  84. #define FF_GL_UNSIGNED_SHORT_1_5_5_5_REV 0x8366

  85. 

  86. /* MinGW exposes only OpenGL 1.1 API */

  87. #define FF_GL_ARRAY_BUFFER                0x8892

  88. #define FF_GL_ELEMENT_ARRAY_BUFFER        0x8893

  89. #define FF_GL_STATIC_DRAW                 0x88E4

  90. #define FF_GL_FRAGMENT_SHADER             0x8B30

  91. #define FF_GL_VERTEX_SHADER               0x8B31

  92. #define FF_GL_COMPILE_STATUS              0x8B81

  93. #define FF_GL_LINK_STATUS                 0x8B82

  94. #define FF_GL_INFO_LOG_LENGTH             0x8B84

  95. typedef void   (APIENTRY *FF_PFNGLACTIVETEXTUREPROC) (GLenum texture);

  96. typedef void   (APIENTRY *FF_PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);

  97. typedef void   (APIENTRY *FF_PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);

  98. typedef void   (APIENTRY *FF_PFNGLBUFFERDATAPROC) (GLenum target, ptrdiff_t size, const GLvoid *data, GLenum usage);

  99. typedef void   (APIENTRY *FF_PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);

  100. typedef GLint  (APIENTRY *FF_PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const char *name);

  101. typedef void   (APIENTRY *FF_PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);

  102. typedef void   (APIENTRY *FF_PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, uintptr_t pointer);

  103. typedef GLint  (APIENTRY *FF_PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const char *name);

  104. typedef void   (APIENTRY *FF_PFNGLUNIFORM1FPROC) (GLint location, GLfloat v0);

  105. typedef void   (APIENTRY *FF_PFNGLUNIFORM1IPROC) (GLint location, GLint v0);

  106. typedef void   (APIENTRY *FF_PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);

  107. typedef GLuint (APIENTRY *FF_PFNGLCREATEPROGRAMPROC) (void);

  108. typedef void   (APIENTRY *FF_PFNGLDELETEPROGRAMPROC) (GLuint program);

  109. typedef void   (APIENTRY *FF_PFNGLUSEPROGRAMPROC) (GLuint program);

  110. typedef void   (APIENTRY *FF_PFNGLLINKPROGRAMPROC) (GLuint program);

  111. typedef void   (APIENTRY *FF_PFNGLGETPROGRAMIVPROC) (GLuint program, GLenum pname, GLint *params);

  112. typedef void   (APIENTRY *FF_PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, char *infoLog);

  113. typedef void   (APIENTRY *FF_PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader);

  114. typedef GLuint (APIENTRY *FF_PFNGLCREATESHADERPROC) (GLenum type);

  115. typedef void   (APIENTRY *FF_PFNGLDELETESHADERPROC) (GLuint shader);

  116. typedef void   (APIENTRY *FF_PFNGLCOMPILESHADERPROC) (GLuint shader);

  117. typedef void   (APIENTRY *FF_PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const char* *string, const GLint *length);

  118. typedef void   (APIENTRY *FF_PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);

  119. typedef void   (APIENTRY *FF_PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, char *infoLog);

  120. 

  121. typedef struct FFOpenGLFunctions {

  122.     FF_PFNGLACTIVETEXTUREPROC glActiveTexture;                     //Require GL ARB multitexture

  123.     FF_PFNGLGENBUFFERSPROC glGenBuffers;                           //Require GL_ARB_vertex_buffer_object

  124.     FF_PFNGLDELETEBUFFERSPROC glDeleteBuffers;                     //Require GL_ARB_vertex_buffer_object

  125.     FF_PFNGLBUFFERDATAPROC glBufferData;                           //Require GL_ARB_vertex_buffer_object

  126.     FF_PFNGLBINDBUFFERPROC glBindBuffer;                           //Require GL_ARB_vertex_buffer_object

  127.     FF_PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation;             //Require GL_ARB_vertex_shader

  128.     FF_PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray; //Require GL_ARB_vertex_shader

  129.     FF_PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer;         //Require GL_ARB_vertex_shader

  130.     FF_PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;           //Require GL_ARB_shader_objects

  131.     FF_PFNGLUNIFORM1FPROC glUniform1f;                             //Require GL_ARB_shader_objects

  132.     FF_PFNGLUNIFORM1IPROC glUniform1i;                             //Require GL_ARB_shader_objects

  133.     FF_PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv;               //Require GL_ARB_shader_objects

  134.     FF_PFNGLCREATEPROGRAMPROC glCreateProgram;                     //Require GL_ARB_shader_objects

  135.     FF_PFNGLDELETEPROGRAMPROC glDeleteProgram;                     //Require GL_ARB_shader_objects

  136.     FF_PFNGLUSEPROGRAMPROC glUseProgram;                           //Require GL_ARB_shader_objects

  137.     FF_PFNGLLINKPROGRAMPROC glLinkProgram;                         //Require GL_ARB_shader_objects

  138.     FF_PFNGLGETPROGRAMIVPROC glGetProgramiv;                       //Require GL_ARB_shader_objects

  139.     FF_PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;             //Require GL_ARB_shader_objects

  140.     FF_PFNGLATTACHSHADERPROC glAttachShader;                       //Require GL_ARB_shader_objects

  141.     FF_PFNGLCREATESHADERPROC glCreateShader;                       //Require GL_ARB_shader_objects

  142.     FF_PFNGLDELETESHADERPROC glDeleteShader;                       //Require GL_ARB_shader_objects

  143.     FF_PFNGLCOMPILESHADERPROC glCompileShader;                     //Require GL_ARB_shader_objects

  144.     FF_PFNGLSHADERSOURCEPROC glShaderSource;                       //Require GL_ARB_shader_objects

  145.     FF_PFNGLGETSHADERIVPROC glGetShaderiv;                         //Require GL_ARB_shader_objects

  146.     FF_PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;               //Require GL_ARB_shader_objects

  147. } FFOpenGLFunctions;

  148. 

  149. #define OPENGL_ERROR_CHECK(ctx) \

  150. {\

  151.     GLenum err_code; \

  152.     if ((err_code = glGetError()) != GL_NO_ERROR) { \

  153.         av_log(ctx, AV_LOG_ERROR, "OpenGL error occurred in '%s', line %d: %d\n", __FUNCTION__, __LINE__, err_code); \

  154.         goto fail; \

  155.     } \

  156. }\

  157. 

  158. typedef struct OpenGLVertexInfo

  159. {

  160.     float x, y, z;    ///<Position

  161.     float s0, t0;     ///<Texture coords

  162. } OpenGLVertexInfo;

  163. 

  164. /* defines 2 triangles to display */

  165. static GLushort g_index[6] =

  166. {

  167.     0, 1, 2,

  168.     0, 3, 2,

  169. };

  170. 

  171. typedef struct OpenGLContext {

  172.     AVClass *class;                    ///< class for private options

  173. 

  174. #if HAVE_SDL

  175.     SDL_Surface *surface;

  176. #endif

  177.     FFOpenGLFunctions glprocs;

  178. 

  179.     uint8_t background[4];             ///< Background color

  180.     int no_window;                     ///< 0 for create default window

  181.     char *window_title;                ///< Title of the window

  182. 

  183.     /* OpenGL implementation limits */

  184.     GLint max_texture_size;            ///< Maximum texture size

  185.     GLint max_viewport_width;          ///< Maximum viewport size

  186.     GLint max_viewport_height;         ///< Maximum viewport size

  187.     int non_pow_2_textures;            ///< 1 when non power of 2 textures are supported

  188. 

  189.     /* Current OpenGL configuration */

  190.     GLuint program;                    ///< Shader program

  191.     GLuint texture_name[4];            ///< Textures' IDs

  192.     GLuint index_buffer;               ///< Index buffer

  193.     GLuint vertex_buffer;              ///< Vertex buffer

  194.     OpenGLVertexInfo vertex[4];        ///< VBO

  195.     GLint projection_matrix_location;  ///< Uniforms' locations

  196.     GLint model_view_matrix_location;

  197.     GLint color_map_location;

  198.     GLint chroma_div_w_location;

  199.     GLint chroma_div_h_location;

  200.     GLint texture_location[4];

  201.     GLint position_attrib;             ///< Attibutes' locations

  202.     GLint texture_coords_attrib;

  203. 

  204.     GLfloat projection_matrix[16];     ///< Projection matrix

  205.     GLfloat model_view_matrix[16];     ///< Modev view matrix

  206.     GLfloat color_map[16];             ///< RGBA color map matrix

  207.     GLfloat chroma_div_w;              ///< Chroma subsampling w ratio

  208.     GLfloat chroma_div_h;              ///< Chroma subsampling h ratio

  209. 

  210.     /* Stream information */

  211.     GLenum format;

  212.     GLenum type;

  213.     int width;                         ///< Stream width

  214.     int height;                        ///< Stream height

  215.     enum AVPixelFormat pix_fmt;        ///< Stream pixel format

  216.     int picture_width;                 ///< Rendered width

  217.     int picture_height;                ///< Rendered height

  218.     int window_width;

  219.     int window_height;

  220. } OpenGLContext;

  221. 

  222. static const struct OpenGLFormatDesc {

  223.     enum AVPixelFormat fixel_format;

  224.     const char * const * fragment_shader;

  225.     GLenum format;

  226.     GLenum type;

  227. } opengl_format_desc[] = {

  228.     { AV_PIX_FMT_YUV420P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  229.     { AV_PIX_FMT_YUV444P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  230.     { AV_PIX_FMT_YUV422P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  231.     { AV_PIX_FMT_YUV410P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  232.     { AV_PIX_FMT_YUV411P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  233.     { AV_PIX_FMT_YUV440P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  234.     { AV_PIX_FMT_YUV420P16,  &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  235.     { AV_PIX_FMT_YUV422P16,  &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  236.     { AV_PIX_FMT_YUV444P16,  &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  237.     { AV_PIX_FMT_YUVA420P,   &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  238.     { AV_PIX_FMT_YUVA444P,   &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  239.     { AV_PIX_FMT_YUVA422P,   &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  240.     { AV_PIX_FMT_YUVA420P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  241.     { AV_PIX_FMT_YUVA422P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  242.     { AV_PIX_FMT_YUVA444P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  243.     { AV_PIX_FMT_RGB24,      &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_BYTE },

  244.     { AV_PIX_FMT_BGR24,      &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_BYTE },

  245.     { AV_PIX_FMT_0RGB,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },

  246.     { AV_PIX_FMT_RGB0,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },

  247.     { AV_PIX_FMT_0BGR,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },

  248.     { AV_PIX_FMT_BGR0,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },

  249.     { AV_PIX_FMT_RGB565,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_SHORT_5_6_5 },

  250.     { AV_PIX_FMT_BGR565,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_SHORT_5_6_5 },

  251.     { AV_PIX_FMT_RGB555,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, FF_GL_UNSIGNED_SHORT_1_5_5_5_REV },

  252.     { AV_PIX_FMT_BGR555,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, FF_GL_UNSIGNED_SHORT_1_5_5_5_REV },

  253.     { AV_PIX_FMT_RGB8,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, FF_GL_UNSIGNED_BYTE_3_3_2 },

  254.     { AV_PIX_FMT_BGR8,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, FF_GL_UNSIGNED_BYTE_2_3_3_REV },

  255.     { AV_PIX_FMT_RGB48,      &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_SHORT },

  256.     { AV_PIX_FMT_ARGB,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },

  257.     { AV_PIX_FMT_RGBA,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },

  258.     { AV_PIX_FMT_ABGR,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },

  259.     { AV_PIX_FMT_BGRA,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },

  260.     { AV_PIX_FMT_RGBA64,     &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_SHORT },

  261.     { AV_PIX_FMT_BGRA64,     &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_SHORT },

  262.     { AV_PIX_FMT_GBRP,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  263.     { AV_PIX_FMT_GBRP16,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  264.     { AV_PIX_FMT_GBRAP,      &FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },

  265.     { AV_PIX_FMT_GBRAP16,    &FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },

  266.     { AV_PIX_FMT_NONE,       NULL }

  267. };

  268. 

  269. static av_cold int opengl_prepare_vertex(AVFormatContext *s);

  270. static int opengl_draw(AVFormatContext *h, AVPacket *pkt, int repaint);

  271. static av_cold int opengl_init_context(OpenGLContext *opengl);

  272. 

  273. static int opengl_resize(AVFormatContext *h, int width, int height)

  274. {

  275.     int ret = 0;

  276.     OpenGLContext *opengl = h->priv_data;

  277.     opengl->window_width = width;

  278.     opengl->window_height = height;

  279.     /* max_viewport_width == 0 means write_header was not called yet. */

  280.     if (opengl->max_viewport_width) {

  281.         if (opengl->no_window &&

  282.             (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {

  283.             av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");

  284.             goto end;

  285.         }

  286.         if ((ret = opengl_prepare_vertex(h)) < 0)

  287.             goto end;

  288.         ret = opengl_draw(h, NULL, 1);

  289.     }

  290.   end:

  291.     return ret;

  292. }

  293. 

  294. static int opengl_control_message(AVFormatContext *h, int type, void *data, size_t data_size)

  295. {

  296.     OpenGLContext *opengl = h->priv_data;

  297.     switch(type) {

  298.     case AV_APP_TO_DEV_WINDOW_SIZE:

  299.         if (data) {

  300.             AVDeviceRect *message = data;

  301.             return opengl_resize(h, message->width, message->height);

  302.         }

  303.         return AVERROR(EINVAL);

  304.     case AV_APP_TO_DEV_WINDOW_REPAINT:

  305.         return opengl_resize(h, opengl->window_width, opengl->window_height);

  306.     }

  307.     return AVERROR(ENOSYS);

  308. }

  309. 

  310. #if HAVE_SDL

  311. static int opengl_sdl_recreate_window(OpenGLContext *opengl, int width, int height)

  312. {

  313.     opengl->surface = SDL_SetVideoMode(width, height,

  314.                                        32, SDL_OPENGL | SDL_RESIZABLE);

  315.     if (!opengl->surface) {

  316.         av_log(opengl, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());

  317.         return AVERROR_EXTERNAL;

  318.     }

  319.     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);

  320.     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);

  321.     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);

  322.     SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);

  323.     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

  324.     return 0;

  325. }

  326. 

  327. static int opengl_sdl_process_events(AVFormatContext *h)

  328. {

  329.     int ret;

  330.     OpenGLContext *opengl = h->priv_data;

  331.     SDL_Event event;

  332.     SDL_PumpEvents();

  333.     while (SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_ALLEVENTS) > 0) {

  334.         switch (event.type) {

  335.         case SDL_QUIT:

  336.             return AVERROR(EIO);

  337.         case SDL_KEYDOWN:

  338.             switch (event.key.keysym.sym) {

  339.             case SDLK_ESCAPE:

  340.             case SDLK_q:

  341.                 return AVERROR(EIO);

  342.             }

  343.             return 0;

  344.         case SDL_VIDEORESIZE: {

  345.             char buffer[100];

  346.             int reinit;

  347.             AVDeviceRect message;

  348.             /* clean up old context because SDL_SetVideoMode may lose its state. */

  349.             SDL_VideoDriverName(buffer, sizeof(buffer));

  350.             reinit = !av_strncasecmp(buffer, "quartz", sizeof(buffer));

  351.             if (reinit) {

  352.                 glDeleteTextures(4, opengl->texture_name);

  353.                 opengl->glprocs.glDeleteBuffers(2, &opengl->index_buffer);

  354.             }

  355.             if ((ret = opengl_sdl_recreate_window(opengl, event.resize.w, event.resize.h)) < 0)

  356.                 return ret;

  357.             if (reinit && (ret = opengl_init_context(opengl)) < 0)

  358.                 return ret;

  359.             message.width = opengl->surface->w;

  360.             message.height = opengl->surface->h;

  361.             return opengl_control_message(h, AV_APP_TO_DEV_WINDOW_SIZE, &message, sizeof(AVDeviceRect));

  362.             }

  363.         }

  364.     }

  365.     return 0;

  366. }

  367. 

  368. static int av_cold opengl_sdl_create_window(AVFormatContext *h)

  369. {

  370.     int ret;

  371.     char buffer[100];

  372.     OpenGLContext *opengl = h->priv_data;

  373.     AVDeviceRect message;

  374.     if (SDL_Init(SDL_INIT_VIDEO)) {

  375.         av_log(opengl, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());

  376.         return AVERROR_EXTERNAL;

  377.     }

  378.     if ((ret = opengl_sdl_recreate_window(opengl, opengl->width, opengl->height)) < 0)

  379.         return ret;

  380.     av_log(opengl, AV_LOG_INFO, "SDL driver: '%s'.\n", SDL_VideoDriverName(buffer, sizeof(buffer)));

  381.     message.width = opengl->surface->w;

  382.     message.height = opengl->surface->h;

  383.     opengl_control_message(h, AV_APP_TO_DEV_WINDOW_SIZE, &message, sizeof(AVDeviceRect));

  384.     return 0;

  385. }

  386. 

  387. static int av_cold opengl_sdl_load_procedures(OpenGLContext *opengl)

  388. {

  389.     FFOpenGLFunctions *procs = &opengl->glprocs;

  390. 

  391. #define LOAD_OPENGL_FUN(name, type) \

  392.     procs->name = (type)SDL_GL_GetProcAddress(#name); \

  393.     if (!procs->name) { \

  394.         av_log(opengl, AV_LOG_ERROR, "Cannot load OpenGL function: '%s'\n", #name); \

  395.         return AVERROR(ENOSYS); \

  396.     }

  397. 

  398.     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)

  399.     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)

  400.     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)

  401.     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)

  402.     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)

  403.     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)

  404.     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)

  405.     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)

  406.     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)

  407.     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)

  408.     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)

  409.     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)

  410.     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)

  411.     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)

  412.     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)

  413.     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)

  414.     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)

  415.     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)

  416.     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)

  417.     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)

  418.     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)

  419.     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)

  420.     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)

  421.     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)

  422.     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)

  423. 

  424.     return 0;

  425. 

  426. #undef LOAD_OPENGL_FUN

  427. }

  428. #endif /* HAVE_SDL */

  429. 

  430. #if defined(__APPLE__)

  431. static int av_cold opengl_load_procedures(OpenGLContext *opengl)

  432. {

  433.     FFOpenGLFunctions *procs = &opengl->glprocs;

  434. 

  435.     procs->glActiveTexture = glActiveTexture;

  436.     procs->glGenBuffers = glGenBuffers;

  437.     procs->glDeleteBuffers = glDeleteBuffers;

  438.     procs->glBufferData = glBufferData;

  439.     procs->glBindBuffer = glBindBuffer;

  440.     procs->glGetAttribLocation = glGetAttribLocation;

  441.     procs->glGetUniformLocation = glGetUniformLocation;

  442.     procs->glUniform1f = glUniform1f;

  443.     procs->glUniform1i = glUniform1i;

  444.     procs->glUniformMatrix4fv = glUniformMatrix4fv;

  445.     procs->glCreateProgram = glCreateProgram;

  446.     procs->glDeleteProgram = glDeleteProgram;

  447.     procs->glUseProgram = glUseProgram;

  448.     procs->glLinkProgram = glLinkProgram;

  449.     procs->glGetProgramiv = glGetProgramiv;

  450.     procs->glGetProgramInfoLog = glGetProgramInfoLog;

  451.     procs->glAttachShader = glAttachShader;

  452.     procs->glCreateShader = glCreateShader;

  453.     procs->glDeleteShader = glDeleteShader;

  454.     procs->glCompileShader = glCompileShader;

  455.     procs->glShaderSource = glShaderSource;

  456.     procs->glGetShaderiv = glGetShaderiv;

  457.     procs->glGetShaderInfoLog = glGetShaderInfoLog;

  458.     procs->glEnableVertexAttribArray = glEnableVertexAttribArray;

  459.     procs->glVertexAttribPointer = (FF_PFNGLVERTEXATTRIBPOINTERPROC) glVertexAttribPointer;

  460.     return 0;

  461. }

  462. #else

  463. static int av_cold opengl_load_procedures(OpenGLContext *opengl)

  464. {

  465.     FFOpenGLFunctions *procs = &opengl->glprocs;

  466. 

  467. #if HAVE_GLXGETPROCADDRESS

  468. #define SelectedGetProcAddress glXGetProcAddress

  469. #elif HAVE_WGLGETPROCADDRESS

  470. #define SelectedGetProcAddress wglGetProcAddress

  471. #endif

  472. 

  473. #define LOAD_OPENGL_FUN(name, type) \

  474.     procs->name = (type)SelectedGetProcAddress(#name); \

  475.     if (!procs->name) { \

  476.         av_log(opengl, AV_LOG_ERROR, "Cannot load OpenGL function: '%s'\n", #name); \

  477.         return AVERROR(ENOSYS); \

  478.     }

  479. 

  480.     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)

  481.     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)

  482.     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)

  483.     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)

  484.     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)

  485.     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)

  486.     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)

  487.     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)

  488.     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)

  489.     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)

  490.     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)

  491.     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)

  492.     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)

  493.     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)

  494.     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)

  495.     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)

  496.     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)

  497.     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)

  498.     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)

  499.     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)

  500.     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)

  501.     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)

  502.     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)

  503.     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)

  504.     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)

  505. 

  506.     return 0;

  507. 

  508. #undef SelectedGetProcAddress

  509. #undef LOAD_OPENGL_FUN

  510. }

  511. #endif

  512. 

  513. static av_always_inline void opengl_make_identity(float matrix[16])

  514. {

  515.     memset(matrix, 0, 16 * sizeof(float));

  516.     matrix[0] = matrix[5] = matrix[10] = matrix[15] = 1.0f;

  517. }

  518. 

  519. static av_always_inline void opengl_make_ortho(float matrix[16],

  520.                                                float left,   float right,

  521.                                                float bottom, float top,

  522.                                                float nearZ,  float farZ)

  523. {

  524.     float ral = right + left;

  525.     float rsl = right - left;

  526.     float tab = top + bottom;

  527.     float tsb = top - bottom;

  528.     float fan = farZ + nearZ;

  529.     float fsn = farZ - nearZ;

  530. 

  531.     memset(matrix, 0, 16 * sizeof(float));

  532.     matrix[0] = 2.0f / rsl;

  533.     matrix[5] = 2.0f / tsb;

  534.     matrix[10] = -2.0f / fsn;

  535.     matrix[12] = -ral / rsl;

  536.     matrix[13] = -tab / tsb;

  537.     matrix[14] = -fan / fsn;

  538.     matrix[15] = 1.0f;

  539. }

  540. 

  541. static av_cold int opengl_read_limits(OpenGLContext *opengl)

  542. {

  543.     static const struct{

  544.         const char *extention;

  545.         int major;

  546.         int minor;

  547.     } required_extensions[] = {

  548.         { "GL_ARB_multitexture",         1, 3 },

  549.         { "GL_ARB_vertex_buffer_object", 1, 5 }, //GLX_ARB_vertex_buffer_object

  550.         { "GL_ARB_vertex_shader",        2, 0 },

  551.         { "GL_ARB_fragment_shader",      2, 0 },

  552.         { "GL_ARB_shader_objects",       2, 0 },

  553.         { NULL,                          0, 0 }

  554.     };

  555.     int i, major, minor;

  556.     const char *extensions, *version;

  557. 

  558.     version = glGetString(GL_VERSION);

  559.     extensions = glGetString(GL_EXTENSIONS);

  560. 

  561.     av_log(opengl, AV_LOG_DEBUG, "OpenGL version: %s\n", version);

  562.     sscanf(version, "%d.%d", &major, &minor);

  563. 

  564.     for (i = 0; required_extensions[i].extention; i++) {

  565.         if (major < required_extensions[i].major &&

  566.             (major == required_extensions[i].major && minor < required_extensions[i].minor) &&

  567.             !strstr(extensions, required_extensions[i].extention)) {

  568.             av_log(opengl, AV_LOG_ERROR, "Required extension %s is not supported.\n",

  569.                    required_extensions[i].extention);

  570.             av_log(opengl, AV_LOG_DEBUG, "Supported extensions are: %s\n", extensions);

  571.             return AVERROR(ENOSYS);

  572.         }

  573.     }

  574.     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &opengl->max_texture_size);

  575.     glGetIntegerv(GL_MAX_VIEWPORT_DIMS, &opengl->max_viewport_width);

  576.     opengl->non_pow_2_textures = major >= 2 || strstr(extensions, "GL_ARB_texture_non_power_of_two");

  577. 

  578.     av_log(opengl, AV_LOG_DEBUG, "Non Power of 2 textures support: %s\n", opengl->non_pow_2_textures ? "Yes" : "No");

  579.     av_log(opengl, AV_LOG_DEBUG, "Max texture size: %dx%d\n", opengl->max_texture_size, opengl->max_texture_size);

  580.     av_log(opengl, AV_LOG_DEBUG, "Max viewport size: %dx%d\n",

  581.            opengl->max_viewport_width, opengl->max_viewport_height);

  582. 

  583.     OPENGL_ERROR_CHECK(opengl);

  584.     return 0;

  585.   fail:

  586.     return AVERROR_EXTERNAL;

  587. }

  588. 

  589. static const char* opengl_get_fragment_shader_code(enum AVPixelFormat format)

  590. {

  591.     int i;

  592.     for (i = 0; i < FF_ARRAY_ELEMS(opengl_format_desc); i++) {

  593.         if (opengl_format_desc[i].fixel_format == format)

  594.             return *opengl_format_desc[i].fragment_shader;

  595.     }

  596.     return NULL;

  597. }

  598. 

  599. static av_always_inline int opengl_type_size(GLenum type)

  600. {

  601.     switch(type) {

  602.     case GL_UNSIGNED_SHORT:

  603.     case FF_GL_UNSIGNED_SHORT_1_5_5_5_REV:

  604.     case GL_UNSIGNED_SHORT_5_6_5:

  605.         return 2;

  606.     case GL_UNSIGNED_BYTE:

  607.     case FF_GL_UNSIGNED_BYTE_3_3_2:

  608.     case FF_GL_UNSIGNED_BYTE_2_3_3_REV:

  609.     default:

  610.         break;

  611.     }

  612.     return 1;

  613. }

  614. 

  615. static av_cold void opengl_get_texture_params(OpenGLContext *opengl)

  616. {

  617.     int i;

  618.     for (i = 0; i < FF_ARRAY_ELEMS(opengl_format_desc); i++) {

  619.         if (opengl_format_desc[i].fixel_format == opengl->pix_fmt) {

  620.             opengl->format = opengl_format_desc[i].format;

  621.             opengl->type = opengl_format_desc[i].type;

  622.             break;

  623.         }

  624.     }

  625. }

  626. 

  627. static void opengl_compute_display_area(AVFormatContext *s)

  628. {

  629.     AVRational sar, dar; /* sample and display aspect ratios */

  630.     OpenGLContext *opengl = s->priv_data;

  631.     AVStream *st = s->streams[0];

  632.     AVCodecContext *encctx = st->codec;

  633. 

  634.     /* compute overlay width and height from the codec context information */

  635.     sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };

  636.     dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });

  637. 

  638.     /* we suppose the screen has a 1/1 sample aspect ratio */

  639.     /* fit in the window */

  640.     if (av_cmp_q(dar, (AVRational){ opengl->window_width, opengl->window_height }) > 0) {

  641.         /* fit in width */

  642.         opengl->picture_width = opengl->window_width;

  643.         opengl->picture_height = av_rescale(opengl->picture_width, dar.den, dar.num);

  644.     } else {

  645.         /* fit in height */

  646.         opengl->picture_height = opengl->window_height;

  647.         opengl->picture_width = av_rescale(opengl->picture_height, dar.num, dar.den);

  648.     }

  649. }

  650. 

  651. static av_cold void opengl_get_texture_size(OpenGLContext *opengl, int in_width, int in_height,

  652.                                             int *out_width, int *out_height)

  653. {

  654.     if (opengl->non_pow_2_textures) {

  655.         *out_width = in_width;

  656.         *out_height = in_height;

  657.     } else {

  658.         int max = FFMIN(FFMAX(in_width, in_height), opengl->max_texture_size);

  659.         unsigned power_of_2 = 1;

  660.         while (power_of_2 < max)

  661.             power_of_2 *= 2;

  662.         *out_height = power_of_2;

  663.         *out_width = power_of_2;

  664.         av_log(opengl, AV_LOG_DEBUG, "Texture size calculated from %dx%d into %dx%d\n",

  665.                in_width, in_height, *out_width, *out_height);

  666.     }

  667. }

  668. 

  669. static av_cold void opengl_fill_color_map(OpenGLContext *opengl)

  670. {

  671.     const AVPixFmtDescriptor *desc;

  672.     int shift;

  673.     enum AVPixelFormat pix_fmt = opengl->pix_fmt;

  674. 

  675.     /* We need order of components, not exact position, some minor HACKs here */

  676.     if (pix_fmt == AV_PIX_FMT_RGB565 || pix_fmt == AV_PIX_FMT_BGR555 ||

  677.         pix_fmt == AV_PIX_FMT_BGR8   || pix_fmt == AV_PIX_FMT_RGB8)

  678.         pix_fmt = AV_PIX_FMT_RGB24;

  679.     else if (pix_fmt == AV_PIX_FMT_BGR565 || pix_fmt == AV_PIX_FMT_RGB555)

  680.         pix_fmt = AV_PIX_FMT_BGR24;

  681. 

  682.     desc = av_pix_fmt_desc_get(pix_fmt);

  683.     if (!(desc->flags & AV_PIX_FMT_FLAG_RGB))

  684.         return;

  685. 

  686. #define FILL_COMPONENT(i) { \

  687.         shift = desc->comp[i].depth_minus1 >> 3; \

  688.         opengl->color_map[(i << 2) + ((desc->comp[i].offset_plus1 - 1) >> shift)] = 1.0; \

  689.     }

  690. 

  691.     memset(opengl->color_map, 0, sizeof(opengl->color_map));

  692.     FILL_COMPONENT(0);

  693.     FILL_COMPONENT(1);

  694.     FILL_COMPONENT(2);

  695.     if (desc->flags & AV_PIX_FMT_FLAG_ALPHA)

  696.         FILL_COMPONENT(3);

  697. 

  698. #undef FILL_COMPONENT

  699. }

  700. 

  701. static av_cold GLuint opengl_load_shader(OpenGLContext *opengl, GLenum type, const char *source)

  702. {

  703.     GLuint shader = opengl->glprocs.glCreateShader(type);

  704.     GLint result;

  705.     if (!shader) {

  706.         av_log(opengl, AV_LOG_ERROR, "glCreateShader() failed\n");

  707.         return 0;

  708.     }

  709.     opengl->glprocs.glShaderSource(shader, 1, &source, NULL);

  710.     opengl->glprocs.glCompileShader(shader);

  711. 

  712.     opengl->glprocs.glGetShaderiv(shader, FF_GL_COMPILE_STATUS, &result);

  713.     if (!result) {

  714.         char *log;

  715.         opengl->glprocs.glGetShaderiv(shader, FF_GL_INFO_LOG_LENGTH, &result);

  716.         if (result) {

  717.             if ((log = av_malloc(result))) {

  718.                 opengl->glprocs.glGetShaderInfoLog(shader, result, NULL, log);

  719.                 av_log(opengl, AV_LOG_ERROR, "Compile error: %s\n", log);

  720.                 av_free(log);

  721.             }

  722.         }

  723.         goto fail;

  724.     }

  725.     OPENGL_ERROR_CHECK(opengl);

  726.     return shader;

  727.   fail:

  728.     opengl->glprocs.glDeleteShader(shader);

  729.     return 0;

  730. }

  731. 

  732. static av_cold int opengl_compile_shaders(OpenGLContext *opengl, enum AVPixelFormat pix_fmt)

  733. {

  734.     GLuint vertex_shader = 0, fragment_shader = 0;

  735.     GLint result;

  736.     const char *fragment_shader_code = opengl_get_fragment_shader_code(pix_fmt);

  737. 

  738.     if (!fragment_shader_code) {

  739.         av_log(opengl, AV_LOG_ERROR, "Provided pixel format '%s' is not supported\n",

  740.                av_get_pix_fmt_name(pix_fmt));

  741.         return AVERROR(EINVAL);

  742.     }

  743. 

  744.     vertex_shader = opengl_load_shader(opengl, FF_GL_VERTEX_SHADER,

  745.                                        FF_OPENGL_VERTEX_SHADER);

  746.     if (!vertex_shader) {

  747.         av_log(opengl, AV_LOG_ERROR, "Vertex shader loading failed.\n");

  748.         goto fail;

  749.     }

  750.     fragment_shader = opengl_load_shader(opengl, FF_GL_FRAGMENT_SHADER,

  751.                                          fragment_shader_code);

  752.     if (!fragment_shader) {

  753.         av_log(opengl, AV_LOG_ERROR, "Fragment shader loading failed.\n");

  754.         goto fail;

  755.     }

  756. 

  757.     opengl->program = opengl->glprocs.glCreateProgram();

  758.     if (!opengl->program)

  759.         goto fail;

  760. 

  761.     opengl->glprocs.glAttachShader(opengl->program, vertex_shader);

  762.     opengl->glprocs.glAttachShader(opengl->program, fragment_shader);

  763.     opengl->glprocs.glLinkProgram(opengl->program);

  764. 

  765.     opengl->glprocs.glGetProgramiv(opengl->program, FF_GL_LINK_STATUS, &result);

  766.     if (!result) {

  767.         char *log;

  768.         opengl->glprocs.glGetProgramiv(opengl->program, FF_GL_INFO_LOG_LENGTH, &result);

  769.         if (result) {

  770.             log = av_malloc(result);

  771.             if (!log)

  772.                 goto fail;

  773.             opengl->glprocs.glGetProgramInfoLog(opengl->program, result, NULL, log);

  774.             av_log(opengl, AV_LOG_ERROR, "Link error: %s\n", log);

  775.             av_free(log);

  776.         }

  777.         goto fail;

  778.     }

  779. 

  780.     opengl->position_attrib = opengl->glprocs.glGetAttribLocation(opengl->program, "a_position");

  781.     opengl->texture_coords_attrib = opengl->glprocs.glGetAttribLocation(opengl->program, "a_textureCoords");

  782.     opengl->projection_matrix_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_projectionMatrix");

  783.     opengl->model_view_matrix_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_modelViewMatrix");

  784.     opengl->color_map_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_colorMap");

  785.     opengl->texture_location[0] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture0");

  786.     opengl->texture_location[1] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture1");

  787.     opengl->texture_location[2] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture2");

  788.     opengl->texture_location[3] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture3");

  789.     opengl->chroma_div_w_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_chroma_div_w");

  790.     opengl->chroma_div_h_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_chroma_div_h");

  791. 

  792.     OPENGL_ERROR_CHECK(opengl);

  793.     return 0;

  794.   fail:

  795.     opengl->glprocs.glDeleteShader(vertex_shader);

  796.     opengl->glprocs.glDeleteShader(fragment_shader);

  797.     opengl->glprocs.glDeleteProgram(opengl->program);

  798.     opengl->program = 0;

  799.     return AVERROR_EXTERNAL;

  800. }

  801. 

  802. static av_cold int opengl_configure_texture(OpenGLContext *opengl, GLuint texture,

  803.                                             GLsizei width, GLsizei height)

  804. {

  805.     if (texture) {

  806.         int new_width, new_height;

  807.         opengl_get_texture_size(opengl, width, height, &new_width, &new_height);

  808.         glBindTexture(GL_TEXTURE_2D, texture);

  809.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

  810.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  811.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

  812.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

  813.         glTexImage2D(GL_TEXTURE_2D, 0, opengl->format, new_width, new_height, 0,

  814.                      opengl->format, opengl->type, NULL);

  815.         OPENGL_ERROR_CHECK(NULL);

  816.     }

  817.     return 0;

  818.   fail:

  819.     return AVERROR_EXTERNAL;

  820. }

  821. 

  822. static av_cold int opengl_prepare_vertex(AVFormatContext *s)

  823. {

  824.     OpenGLContext *opengl = s->priv_data;

  825.     int tex_w, tex_h;

  826. 

  827.     if (opengl->window_width > opengl->max_viewport_width || opengl->window_height > opengl->max_viewport_height) {

  828.         opengl->window_width = FFMAX(opengl->window_width, opengl->max_viewport_width);

  829.         opengl->window_height = FFMAX(opengl->window_height, opengl->max_viewport_height);

  830.         av_log(opengl, AV_LOG_WARNING, "Too big viewport requested, limited to %dx%d", opengl->window_width, opengl->window_height);

  831.     }

  832.     glViewport(0, 0, opengl->window_width, opengl->window_height);

  833.     opengl_make_ortho(opengl->projection_matrix,

  834.                       - (float)opengl->window_width  / 2.0f, (float)opengl->window_width  / 2.0f,

  835.                       - (float)opengl->window_height / 2.0f, (float)opengl->window_height / 2.0f,

  836.                       1.0f, -1.0f);

  837.     opengl_make_identity(opengl->model_view_matrix);

  838. 

  839.     opengl_compute_display_area(s);

  840. 

  841.     opengl->vertex[0].z = opengl->vertex[1].z = opengl->vertex[2].z = opengl->vertex[3].z = 0.0f;

  842.     opengl->vertex[0].x = opengl->vertex[1].x = - (float)opengl->picture_width / 2.0f;

  843.     opengl->vertex[2].x = opengl->vertex[3].x =   (float)opengl->picture_width / 2.0f;

  844.     opengl->vertex[1].y = opengl->vertex[2].y = - (float)opengl->picture_height / 2.0f;

  845.     opengl->vertex[0].y = opengl->vertex[3].y =   (float)opengl->picture_height / 2.0f;

  846. 

  847.     opengl_get_texture_size(opengl, opengl->width, opengl->height, &tex_w, &tex_h);

  848. 

  849.     opengl->vertex[0].s0 = 0.0f;

  850.     opengl->vertex[0].t0 = 0.0f;

  851.     opengl->vertex[1].s0 = 0.0f;

  852.     opengl->vertex[1].t0 = (float)opengl->height / (float)tex_h;

  853.     opengl->vertex[2].s0 = (float)opengl->width  / (float)tex_w;

  854.     opengl->vertex[2].t0 = (float)opengl->height / (float)tex_h;

  855.     opengl->vertex[3].s0 = (float)opengl->width  / (float)tex_w;

  856.     opengl->vertex[3].t0 = 0.0f;

  857. 

  858.     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);

  859.     opengl->glprocs.glBufferData(FF_GL_ARRAY_BUFFER, sizeof(opengl->vertex), opengl->vertex, FF_GL_STATIC_DRAW);

  860.     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, 0);

  861.     OPENGL_ERROR_CHECK(opengl);

  862.     return 0;

  863.   fail:

  864.     return AVERROR_EXTERNAL;

  865. }

  866. 

  867. static int opengl_prepare(OpenGLContext *opengl)

  868. {

  869.     int i;

  870.     opengl->glprocs.glUseProgram(opengl->program);

  871.     opengl->glprocs.glUniformMatrix4fv(opengl->projection_matrix_location, 1, GL_FALSE, opengl->projection_matrix);

  872.     opengl->glprocs.glUniformMatrix4fv(opengl->model_view_matrix_location, 1, GL_FALSE, opengl->model_view_matrix);

  873.     for (i = 0; i < 4; i++)

  874.         if (opengl->texture_location[i] != -1) {

  875.             opengl->glprocs.glActiveTexture(GL_TEXTURE0 + i);

  876.             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[i]);

  877.             opengl->glprocs.glUniform1i(opengl->texture_location[i], i);

  878.         }

  879.     if (opengl->color_map_location != -1)

  880.         opengl->glprocs.glUniformMatrix4fv(opengl->color_map_location, 1, GL_FALSE, opengl->color_map);

  881.     if (opengl->chroma_div_h_location != -1)

  882.         opengl->glprocs.glUniform1f(opengl->chroma_div_h_location, opengl->chroma_div_h);

  883.     if (opengl->chroma_div_w_location != -1)

  884.         opengl->glprocs.glUniform1f(opengl->chroma_div_w_location, opengl->chroma_div_w);

  885. 

  886.     OPENGL_ERROR_CHECK(opengl);

  887.     return 0;

  888.   fail:

  889.     return AVERROR_EXTERNAL;

  890. }

  891. 

  892. static av_cold int opengl_write_trailer(AVFormatContext *h)

  893. {

  894.     OpenGLContext *opengl = h->priv_data;

  895. 

  896.     if (opengl->no_window &&

  897.         avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0) < 0)

  898.         av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");

  899. 

  900.     glDeleteTextures(4, opengl->texture_name);

  901.     if (opengl && opengl->glprocs.glDeleteBuffers)

  902.         opengl->glprocs.glDeleteBuffers(2, &opengl->index_buffer);

  903. 

  904. #if HAVE_SDL

  905.     if (!opengl->no_window)

  906.         SDL_Quit();

  907. #endif

  908.     if (opengl->no_window &&

  909.         avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER, NULL , 0) < 0)

  910.         av_log(opengl, AV_LOG_ERROR, "Application failed to release window buffer.\n");

  911. 

  912.     return 0;

  913. }

  914. 

  915. static av_cold int opengl_init_context(OpenGLContext *opengl)

  916. {

  917.     int i, ret;

  918.     const AVPixFmtDescriptor *desc;

  919. 

  920.     if ((ret = opengl_compile_shaders(opengl, opengl->pix_fmt)) < 0)

  921.         goto fail;

  922. 

  923.     desc = av_pix_fmt_desc_get(opengl->pix_fmt);

  924.     av_assert0(desc->nb_components > 0 && desc->nb_components <= 4);

  925.     glGenTextures(desc->nb_components, opengl->texture_name);

  926. 

  927.     opengl->glprocs.glGenBuffers(2, &opengl->index_buffer);

  928.     if (!opengl->index_buffer || !opengl->vertex_buffer) {

  929.         av_log(opengl, AV_LOG_ERROR, "Buffer generation failed.\n");

  930.         ret = AVERROR_EXTERNAL;

  931.         goto fail;

  932.     }

  933. 

  934.     opengl_configure_texture(opengl, opengl->texture_name[0], opengl->width, opengl->height);

  935.     if (desc->nb_components > 1) {

  936.         int has_alpha = desc->flags & AV_PIX_FMT_FLAG_ALPHA;

  937.         int num_planes = desc->nb_components - (has_alpha ? 1 : 0);

  938.         if (opengl->non_pow_2_textures) {

  939.             opengl->chroma_div_w = 1.0f;

  940.             opengl->chroma_div_h = 1.0f;

  941.         } else {

  942.             opengl->chroma_div_w = 1 << desc->log2_chroma_w;

  943.             opengl->chroma_div_h = 1 << desc->log2_chroma_h;

  944.         }

  945.         for (i = 1; i < num_planes; i++)

  946.             if (opengl->non_pow_2_textures)

  947.                 opengl_configure_texture(opengl, opengl->texture_name[i],

  948.                         FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w),

  949.                         FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h));

  950.             else

  951.                 opengl_configure_texture(opengl, opengl->texture_name[i], opengl->width, opengl->height);

  952.         if (has_alpha)

  953.             opengl_configure_texture(opengl, opengl->texture_name[3], opengl->width, opengl->height);

  954.     }

  955. 

  956.     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);

  957.     opengl->glprocs.glBufferData(FF_GL_ELEMENT_ARRAY_BUFFER, sizeof(g_index), g_index, FF_GL_STATIC_DRAW);

  958.     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, 0);

  959. 

  960.     glEnable(GL_BLEND);

  961.     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  962. 

  963.     glClearColor((float)opengl->background[0] / 255.0f, (float)opengl->background[1] / 255.0f,

  964.                  (float)opengl->background[2] / 255.0f, 1.0f);

  965. 

  966.     ret = AVERROR_EXTERNAL;

  967.     OPENGL_ERROR_CHECK(opengl);

  968. 

  969.     return 0;

  970.   fail:

  971.     return ret;

  972. }

  973. 

  974. static av_cold int opengl_write_header(AVFormatContext *h)

  975. {

  976.     OpenGLContext *opengl = h->priv_data;

  977.     AVStream *st;

  978.     int ret;

  979. 

  980.     if (h->nb_streams != 1 ||

  981.         h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO ||

  982.         h->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {

  983.         av_log(opengl, AV_LOG_ERROR, "Only a single video stream is supported.\n");

  984.         return AVERROR(EINVAL);

  985.     }

  986.     st = h->streams[0];

  987.     opengl->width = st->codec->width;

  988.     opengl->height = st->codec->height;

  989.     opengl->pix_fmt = st->codec->pix_fmt;

  990. 

  991.     if (!opengl->window_title && !opengl->no_window)

  992.         opengl->window_title = av_strdup(h->filename);

  993. 

  994.     if (!opengl->no_window) {

  995. #if HAVE_SDL

  996.         if ((ret = opengl_sdl_create_window(h)) < 0)

  997.             goto fail;

  998. #else

  999.         av_log(opengl, AV_LOG_ERROR, "FFmpeg is compiled without SDL. Cannot create default window.\n");

  1000.         ret = AVERROR(ENOSYS);

  1001.         goto fail;

  1002. #endif

  1003.     } else {

  1004.         if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_CREATE_WINDOW_BUFFER, NULL , 0)) < 0) {

  1005.             av_log(opengl, AV_LOG_ERROR, "Application failed to create window buffer.\n");

  1006.             goto fail;

  1007.         }

  1008.         if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {

  1009.             av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");

  1010.             goto fail;

  1011.         }

  1012.     }

  1013. 

  1014.     if ((ret = opengl_read_limits(opengl)) < 0)

  1015.         goto fail;

  1016. 

  1017.     if (opengl->width > opengl->max_texture_size || opengl->height > opengl->max_texture_size) {

  1018.         av_log(opengl, AV_LOG_ERROR, "Too big picture %dx%d, max supported size is %dx%d\n",

  1019.                opengl->width, opengl->height, opengl->max_texture_size, opengl->max_texture_size);

  1020.         ret = AVERROR(EINVAL);

  1021.         goto fail;

  1022.     }

  1023. 

  1024.     if (!opengl->no_window) {

  1025. #if HAVE_SDL

  1026.         if ((ret = opengl_sdl_load_procedures(opengl)) < 0)

  1027.             goto fail;

  1028. #endif

  1029.     } else if ((ret = opengl_load_procedures(opengl)) < 0)

  1030.         goto fail;

  1031. 

  1032.     opengl_fill_color_map(opengl);

  1033.     opengl_get_texture_params(opengl);

  1034. 

  1035.     if ((ret = opengl_init_context(opengl)) < 0)

  1036.         goto fail;

  1037. 

  1038.     if ((ret = opengl_prepare_vertex(h)) < 0)

  1039.         goto fail;

  1040. 

  1041.     glClear(GL_COLOR_BUFFER_BIT);

  1042. 

  1043. #if HAVE_SDL

  1044.     if (!opengl->no_window)

  1045.         SDL_GL_SwapBuffers();

  1046. #endif

  1047.     if (opengl->no_window &&

  1048.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {

  1049.         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");

  1050.         goto fail;

  1051.     }

  1052. 

  1053.     ret = AVERROR_EXTERNAL;

  1054.     OPENGL_ERROR_CHECK(opengl);

  1055.     return 0;

  1056. 

  1057.   fail:

  1058.     opengl_write_trailer(h);

  1059.     return ret;

  1060. }

  1061. 

  1062. static uint8_t* opengl_get_plane_pointer(OpenGLContext *opengl, AVPacket *pkt, int comp_index,

  1063.                                          const AVPixFmtDescriptor *desc)

  1064. {

  1065.     uint8_t *data = pkt->data;

  1066.     int wordsize = opengl_type_size(opengl->type);

  1067.     int width_chroma = FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);

  1068.     int height_chroma = FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);

  1069.     int plane = desc->comp[comp_index].plane;

  1070. 

  1071.     switch(plane) {

  1072.     case 0:

  1073.         break;

  1074.     case 1:

  1075.         data += opengl->width * opengl->height * wordsize;

  1076.         break;

  1077.     case 2:

  1078.         data += opengl->width * opengl->height * wordsize;

  1079.         data += width_chroma * height_chroma * wordsize;

  1080.         break;

  1081.     case 3:

  1082.         data += opengl->width * opengl->height * wordsize;

  1083.         data += 2 * width_chroma * height_chroma * wordsize;

  1084.         break;

  1085.     default:

  1086.         return NULL;

  1087.     }

  1088.     return data;

  1089. }

  1090. 

  1091. static int opengl_draw(AVFormatContext *h, AVPacket *pkt, int repaint)

  1092. {

  1093.     OpenGLContext *opengl = h->priv_data;

  1094.     enum AVPixelFormat pix_fmt = h->streams[0]->codec->pix_fmt;

  1095.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

  1096.     int ret;

  1097. 

  1098. #if HAVE_SDL

  1099.     if (!opengl->no_window && (ret = opengl_sdl_process_events(h)) < 0)

  1100.         goto fail;

  1101. #endif

  1102.     if (opengl->no_window &&

  1103.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {

  1104.         av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");

  1105.         goto fail;

  1106.     }

  1107. 

  1108.     glClear(GL_COLOR_BUFFER_BIT);

  1109. 

  1110.     if (!repaint) {

  1111.         glBindTexture(GL_TEXTURE_2D, opengl->texture_name[0]);

  1112.         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, opengl->width, opengl->height, opengl->format, opengl->type,

  1113.                         opengl_get_plane_pointer(opengl, pkt, 0, desc));

  1114.         if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {

  1115.             int width_chroma = FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);

  1116.             int height_chroma = FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);

  1117.             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[1]);

  1118.             glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_chroma, height_chroma, opengl->format, opengl->type,

  1119.                             opengl_get_plane_pointer(opengl, pkt, 1, desc));

  1120.             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[2]);

  1121.             glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_chroma, height_chroma, opengl->format, opengl->type,

  1122.                             opengl_get_plane_pointer(opengl, pkt, 2, desc));

  1123.             if (desc->flags & AV_PIX_FMT_FLAG_ALPHA) {

  1124.                 glBindTexture(GL_TEXTURE_2D, opengl->texture_name[3]);

  1125.                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, opengl->width, opengl->height, opengl->format, opengl->type,

  1126.                                 opengl_get_plane_pointer(opengl, pkt, 3, desc));

  1127.             }

  1128.         }

  1129.     }

  1130.     ret = AVERROR_EXTERNAL;

  1131.     OPENGL_ERROR_CHECK(opengl);

  1132. 

  1133.     if ((ret = opengl_prepare(opengl)) < 0)

  1134.         goto fail;

  1135. 

  1136.     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);

  1137.     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);

  1138.     opengl->glprocs.glVertexAttribPointer(opengl->position_attrib, 3, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 0);

  1139.     opengl->glprocs.glEnableVertexAttribArray(opengl->position_attrib);

  1140.     opengl->glprocs.glVertexAttribPointer(opengl->texture_coords_attrib, 2, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 12);

  1141.     opengl->glprocs.glEnableVertexAttribArray(opengl->texture_coords_attrib);

  1142. 

  1143.     glDrawElements(GL_TRIANGLES, FF_ARRAY_ELEMS(g_index), GL_UNSIGNED_SHORT, 0);

  1144. 

  1145.     ret = AVERROR_EXTERNAL;

  1146.     OPENGL_ERROR_CHECK(opengl);

  1147. 

  1148. #if HAVE_SDL

  1149.     if (!opengl->no_window)

  1150.         SDL_GL_SwapBuffers();

  1151. #endif

  1152.     if (opengl->no_window &&

  1153.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {

  1154.         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");

  1155.         goto fail;

  1156.     }

  1157. 

  1158.     return 0;

  1159.   fail:

  1160.     return ret;

  1161. }

  1162. 

  1163. static int opengl_write_packet(AVFormatContext *h, AVPacket *pkt)

  1164. {

  1165.     return opengl_draw(h, pkt, 0);

  1166. }

  1167. 

  1168. #define OFFSET(x) offsetof(OpenGLContext, x)

  1169. #define ENC AV_OPT_FLAG_ENCODING_PARAM

  1170. static const AVOption options[] = {

  1171.     { "background",   "set background color",   OFFSET(background),   AV_OPT_TYPE_COLOR,  {.str = "black"}, CHAR_MIN, CHAR_MAX, ENC },

  1172.     { "no_window",    "disable default window", OFFSET(no_window),    AV_OPT_TYPE_INT,    {.i64 = 0}, INT_MIN, INT_MAX, ENC },

  1173.     { "window_title", "set window title",       OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, ENC },

  1174.     { NULL }

  1175. };

  1176. 

  1177. static const AVClass opengl_class = {

  1178.     .class_name = "opengl outdev",

  1179.     .item_name  = av_default_item_name,

  1180.     .option     = options,

  1181.     .version    = LIBAVUTIL_VERSION_INT,

  1182. };

  1183. 

  1184. AVOutputFormat ff_opengl_muxer = {

  1185.     .name           = "opengl",

  1186.     .long_name      = NULL_IF_CONFIG_SMALL("OpenGL output"),

  1187.     .priv_data_size = sizeof(OpenGLContext),

  1188.     .audio_codec    = AV_CODEC_ID_NONE,

  1189.     .video_codec    = AV_CODEC_ID_RAWVIDEO,

  1190.     .write_header   = opengl_write_header,

  1191.     .write_packet   = opengl_write_packet,

  1192.     .write_trailer  = opengl_write_trailer,

  1193.     .control_message = opengl_control_message,

  1194.     .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,

  1195.     .priv_class     = &opengl_class,

  1196. };