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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. /* 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 GL_RED_COMPONENT GL_RED

  75. #elif defined(GL_LUMINANCE)

  76. #define GL_RED_COMPONENT GL_LUMINANCE

  77. #else

  78. #define 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 av_cold int opengl_prepare_vertex(AVFormatContext *s);

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

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

  225. 

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

  227. {

  228.     int ret = 0;

  229.     OpenGLContext *opengl = h->priv_data;

  230.     opengl->window_width = width;

  231.     opengl->window_height = height;

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

  233.     if (opengl->max_viewport_width) {

  234.         if (opengl->no_window &&

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

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

  237.             goto end;

  238.         }

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

  240.             goto end;

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

  242.     }

  243.   end:

  244.     return ret;

  245. }

  246. 

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

  248. {

  249.     OpenGLContext *opengl = h->priv_data;

  250.     switch(type) {

  251.     case AV_APP_TO_DEV_WINDOW_SIZE:

  252.         if (data) {

  253.             AVDeviceRect *message = data;

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

  255.         }

  256.         return AVERROR(EINVAL);

  257.     case AV_APP_TO_DEV_WINDOW_REPAINT:

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

  259.     }

  260.     return AVERROR(ENOSYS);

  261. }

  262. 

  263. #if HAVE_SDL

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

  265. {

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

  267.                                        32, SDL_OPENGL | SDL_RESIZABLE);

  268.     if (!opengl->surface) {

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

  270.         return AVERROR_EXTERNAL;

  271.     }

  272.     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);

  273.     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);

  274.     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);

  275.     SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);

  276.     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

  277.     return 0;

  278. }

  279. 

  280. static int opengl_sdl_process_events(AVFormatContext *h)

  281. {

  282.     int ret;

  283.     OpenGLContext *opengl = h->priv_data;

  284.     SDL_Event event;

  285.     SDL_PumpEvents();

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

  287.         switch (event.type) {

  288.         case SDL_QUIT:

  289.             return AVERROR(EIO);

  290.         case SDL_KEYDOWN:

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

  292.             case SDLK_ESCAPE:

  293.             case SDLK_q:

  294.                 return AVERROR(EIO);

  295.             }

  296.             return 0;

  297.         case SDL_VIDEORESIZE: {

  298.             char buffer[100];

  299.             int reinit;

  300.             AVDeviceRect message;

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

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

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

  304.             if (reinit) {

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

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

  307.             }

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

  309.                 return ret;

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

  311.                 return ret;

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

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

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

  315.             }

  316.         }

  317.     }

  318.     return 0;

  319. }

  320. 

  321. static int av_cold opengl_sdl_create_window(AVFormatContext *h)

  322. {

  323.     int ret;

  324.     char buffer[100];

  325.     OpenGLContext *opengl = h->priv_data;

  326.     AVDeviceRect message;

  327.     if (SDL_Init(SDL_INIT_VIDEO)) {

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

  329.         return AVERROR_EXTERNAL;

  330.     }

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

  332.         return ret;

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

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

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

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

  337.     return 0;

  338. }

  339. 

  340. static int av_cold opengl_sdl_load_procedures(OpenGLContext *opengl)

  341. {

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

  343. 

  344. #define LOAD_OPENGL_FUN(name, type) \

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

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

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

  348.         return AVERROR(ENOSYS); \

  349.     }

  350. 

  351.     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)

  352.     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)

  353.     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)

  354.     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)

  355.     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)

  356.     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)

  357.     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)

  358.     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)

  359.     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)

  360.     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)

  361.     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)

  362.     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)

  363.     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)

  364.     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)

  365.     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)

  366.     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)

  367.     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)

  368.     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)

  369.     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)

  370.     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)

  371.     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)

  372.     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)

  373.     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)

  374.     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)

  375.     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)

  376. 

  377.     return 0;

  378. 

  379. #undef LOAD_OPENGL_FUN

  380. }

  381. #endif /* HAVE_SDL */

  382. 

  383. #if defined(__APPLE__)

  384. static int av_cold opengl_load_procedures(OpenGLContext *opengl)

  385. {

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

  387. 

  388.     procs->glActiveTexture = glActiveTexture;

  389.     procs->glGenBuffers = glGenBuffers;

  390.     procs->glDeleteBuffers = glDeleteBuffers;

  391.     procs->glBufferData = glBufferData;

  392.     procs->glBindBuffer = glBindBuffer;

  393.     procs->glGetAttribLocation = glGetAttribLocation;

  394.     procs->glGetUniformLocation = glGetUniformLocation;

  395.     procs->glUniform1f = glUniform1f;

  396.     procs->glUniform1i = glUniform1i;

  397.     procs->glUniformMatrix4fv = glUniformMatrix4fv;

  398.     procs->glCreateProgram = glCreateProgram;

  399.     procs->glDeleteProgram = glDeleteProgram;

  400.     procs->glUseProgram = glUseProgram;

  401.     procs->glLinkProgram = glLinkProgram;

  402.     procs->glGetProgramiv = glGetProgramiv;

  403.     procs->glGetProgramInfoLog = glGetProgramInfoLog;

  404.     procs->glAttachShader = glAttachShader;

  405.     procs->glCreateShader = glCreateShader;

  406.     procs->glDeleteShader = glDeleteShader;

  407.     procs->glCompileShader = glCompileShader;

  408.     procs->glShaderSource = glShaderSource;

  409.     procs->glGetShaderiv = glGetShaderiv;

  410.     procs->glGetShaderInfoLog = glGetShaderInfoLog;

  411.     procs->glEnableVertexAttribArray = glEnableVertexAttribArray;

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

  413.     return 0;

  414. }

  415. #else

  416. static int av_cold opengl_load_procedures(OpenGLContext *opengl)

  417. {

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

  419. 

  420. #if HAVE_GLXGETPROCADDRESS

  421. #define SelectedGetProcAddress glXGetProcAddress

  422. #elif HAVE_WGLGETPROCADDRESS

  423. #define SelectedGetProcAddress wglGetProcAddress

  424. #endif

  425. 

  426. #define LOAD_OPENGL_FUN(name, type) \

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

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

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

  430.         return AVERROR(ENOSYS); \

  431.     }

  432. 

  433.     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)

  434.     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)

  435.     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)

  436.     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)

  437.     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)

  438.     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)

  439.     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)

  440.     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)

  441.     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)

  442.     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)

  443.     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)

  444.     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)

  445.     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)

  446.     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)

  447.     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)

  448.     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)

  449.     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)

  450.     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)

  451.     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)

  452.     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)

  453.     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)

  454.     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)

  455.     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)

  456.     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)

  457.     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)

  458. 

  459.     return 0;

  460. 

  461. #undef SelectedGetProcAddress

  462. #undef LOAD_OPENGL_FUN

  463. }

  464. #endif

  465. 

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

  467. {

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

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

  470. }

  471. 

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

  473.                                                float left,   float right,

  474.                                                float bottom, float top,

  475.                                                float nearZ,  float farZ)

  476. {

  477.     float ral = right + left;

  478.     float rsl = right - left;

  479.     float tab = top + bottom;

  480.     float tsb = top - bottom;

  481.     float fan = farZ + nearZ;

  482.     float fsn = farZ - nearZ;

  483. 

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

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

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

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

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

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

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

  491.     matrix[15] = 1.0f;

  492. }

  493. 

  494. static av_cold int opengl_read_limits(OpenGLContext *opengl)

  495. {

  496.     static const struct{

  497.         const char *extention;

  498.         int major;

  499.         int minor;

  500.     } required_extensions[] = {

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

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

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

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

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

  506.         { NULL,                          0, 0 }

  507.     };

  508.     int i, major, minor;

  509.     const char *extensions, *version;

  510. 

  511.     version = glGetString(GL_VERSION);

  512.     extensions = glGetString(GL_EXTENSIONS);

  513. 

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

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

  516. 

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

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

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

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

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

  522.                    required_extensions[i].extention);

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

  524.             return AVERROR(ENOSYS);

  525.         }

  526.     }

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

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

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

  530. 

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

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

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

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

  535. 

  536.     OPENGL_ERROR_CHECK(opengl);

  537.     return 0;

  538.   fail:

  539.     return AVERROR_EXTERNAL;

  540. }

  541. 

  542. static av_always_inline const char * opengl_get_fragment_shader_code(enum AVPixelFormat format)

  543. {

  544.     switch (format) {

  545.     case AV_PIX_FMT_YUV420P:    case AV_PIX_FMT_YUV444P:

  546.     case AV_PIX_FMT_YUV422P:    case AV_PIX_FMT_YUV410P:

  547.     case AV_PIX_FMT_YUV411P:    case AV_PIX_FMT_YUV440P:

  548.     case AV_PIX_FMT_YUV420P16:  case AV_PIX_FMT_YUV422P16:

  549.     case AV_PIX_FMT_YUV444P16:

  550.         return FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR;

  551.     case AV_PIX_FMT_YUVA420P:   case AV_PIX_FMT_YUVA444P:

  552.     case AV_PIX_FMT_YUVA422P:

  553.     case AV_PIX_FMT_YUVA420P16: case AV_PIX_FMT_YUVA422P16:

  554.     case AV_PIX_FMT_YUVA444P16:

  555.         return FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR;

  556.     case AV_PIX_FMT_RGB24:      case AV_PIX_FMT_BGR24:

  557.     case AV_PIX_FMT_0RGB:       case AV_PIX_FMT_RGB0:

  558.     case AV_PIX_FMT_0BGR:       case AV_PIX_FMT_BGR0:

  559.     case AV_PIX_FMT_RGB565:     case AV_PIX_FMT_BGR565:

  560.     case AV_PIX_FMT_RGB555:     case AV_PIX_FMT_BGR555:

  561.     case AV_PIX_FMT_RGB8:       case AV_PIX_FMT_BGR8:

  562.     case AV_PIX_FMT_RGB48:

  563.         return FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET;

  564.     case AV_PIX_FMT_ARGB:       case AV_PIX_FMT_RGBA:

  565.     case AV_PIX_FMT_ABGR:       case AV_PIX_FMT_BGRA:

  566.     case AV_PIX_FMT_RGBA64:     case AV_PIX_FMT_BGRA64:

  567.         return FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET;

  568.     case AV_PIX_FMT_GBRP:       case AV_PIX_FMT_GBRP16:

  569.         return FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR;

  570.     case AV_PIX_FMT_GBRAP: case AV_PIX_FMT_GBRAP16:

  571.         return FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR;

  572.     default:

  573.         break;

  574.     }

  575.     return NULL;

  576. }

  577. 

  578. static av_always_inline int opengl_type_size(GLenum type)

  579. {

  580.     switch(type) {

  581.     case GL_UNSIGNED_SHORT:

  582.     case FF_GL_UNSIGNED_SHORT_1_5_5_5_REV:

  583.     case GL_UNSIGNED_SHORT_5_6_5:

  584.         return 2;

  585.     case GL_UNSIGNED_BYTE:

  586.     case FF_GL_UNSIGNED_BYTE_3_3_2:

  587.     case FF_GL_UNSIGNED_BYTE_2_3_3_REV:

  588.     default:

  589.         break;

  590.     }

  591.     return 1;

  592. }

  593. 

  594. static av_cold void opengl_get_texture_params(OpenGLContext *opengl)

  595. {

  596.     switch(opengl->pix_fmt) {

  597.     case AV_PIX_FMT_YUV420P:    case AV_PIX_FMT_YUV444P:

  598.     case AV_PIX_FMT_YUV422P:    case AV_PIX_FMT_YUV410P:

  599.     case AV_PIX_FMT_YUV411P:    case AV_PIX_FMT_YUV440P:

  600.     case AV_PIX_FMT_YUVA420P:   case AV_PIX_FMT_YUVA444P:

  601.     case AV_PIX_FMT_YUVA422P:

  602.     case AV_PIX_FMT_GBRP:       case AV_PIX_FMT_GBRAP:

  603.         opengl->format = GL_RED_COMPONENT;

  604.         opengl->type   = GL_UNSIGNED_BYTE;

  605.         break;

  606.     case AV_PIX_FMT_YUV420P16:  case AV_PIX_FMT_YUV422P16:

  607.     case AV_PIX_FMT_YUV444P16:

  608.     case AV_PIX_FMT_YUVA420P16: case AV_PIX_FMT_YUVA422P16:

  609.     case AV_PIX_FMT_YUVA444P16:

  610.     case AV_PIX_FMT_GBRP16:     case AV_PIX_FMT_GBRAP16:

  611.         opengl->format = GL_RED_COMPONENT;

  612.         opengl->type   = GL_UNSIGNED_SHORT;

  613.         break;

  614.     case AV_PIX_FMT_RGB24:      case AV_PIX_FMT_BGR24:

  615.         opengl->format = GL_RGB;

  616.         opengl->type   = GL_UNSIGNED_BYTE;

  617.         break;

  618.     case AV_PIX_FMT_ARGB:       case AV_PIX_FMT_RGBA:

  619.     case AV_PIX_FMT_ABGR:       case AV_PIX_FMT_BGRA:

  620.     case AV_PIX_FMT_0RGB:       case AV_PIX_FMT_RGB0:

  621.     case AV_PIX_FMT_0BGR:       case AV_PIX_FMT_BGR0:

  622.         opengl->format = GL_RGBA;

  623.         opengl->type   = GL_UNSIGNED_BYTE;

  624.         break;

  625.     case AV_PIX_FMT_RGB8:

  626.         opengl->format = GL_RGB;

  627.         opengl->type   = FF_GL_UNSIGNED_BYTE_3_3_2;

  628.         break;

  629.     case AV_PIX_FMT_BGR8:

  630.         opengl->format = GL_RGB;

  631.         opengl->type   = FF_GL_UNSIGNED_BYTE_2_3_3_REV;

  632.         break;

  633.     case AV_PIX_FMT_RGB555:     case AV_PIX_FMT_BGR555:

  634.         opengl->format = GL_RGBA;

  635.         opengl->type   = FF_GL_UNSIGNED_SHORT_1_5_5_5_REV;

  636.         break;

  637.     case AV_PIX_FMT_RGB565:     case AV_PIX_FMT_BGR565:

  638.         opengl->format = GL_RGB;

  639.         opengl->type   = GL_UNSIGNED_SHORT_5_6_5;

  640.         break;

  641.     case AV_PIX_FMT_RGB48:

  642.         opengl->format = GL_RGB;

  643.         opengl->type   = GL_UNSIGNED_SHORT;

  644.         break;

  645.     case AV_PIX_FMT_RGBA64:     case AV_PIX_FMT_BGRA64:

  646.         opengl->format = GL_RGBA;

  647.         opengl->type   = GL_UNSIGNED_SHORT;

  648.         break;

  649.     }

  650. }

  651. 

  652. static void opengl_compute_display_area(AVFormatContext *s)

  653. {

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

  655.     OpenGLContext *opengl = s->priv_data;

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

  657.     AVCodecContext *encctx = st->codec;

  658. 

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

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

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

  662. 

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

  664.     /* fit in the window */

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

  666.         /* fit in width */

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

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

  669.     } else {

  670.         /* fit in height */

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

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

  673.     }

  674. }

  675. 

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

  677.                                             int *out_width, int *out_height)

  678. {

  679.     if (opengl->non_pow_2_textures) {

  680.         *out_width = in_width;

  681.         *out_height = in_height;

  682.     } else {

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

  684.         unsigned power_of_2 = 1;

  685.         while (power_of_2 < max)

  686.             power_of_2 *= 2;

  687.         *out_height = power_of_2;

  688.         *out_width = power_of_2;

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

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

  691.     }

  692. }

  693. 

  694. static av_cold void opengl_fill_color_map(OpenGLContext *opengl)

  695. {

  696.     const AVPixFmtDescriptor *desc;

  697.     int shift;

  698.     enum AVPixelFormat pix_fmt = opengl->pix_fmt;

  699. 

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

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

  702.         pix_fmt == AV_PIX_FMT_BGR8   || pix_fmt == AV_PIX_FMT_RGB8)

  703.         pix_fmt = AV_PIX_FMT_RGB24;

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

  705.         pix_fmt = AV_PIX_FMT_BGR24;

  706. 

  707.     desc = av_pix_fmt_desc_get(pix_fmt);

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

  709.         return;

  710. 

  711. #define FILL_COMPONENT(i) { \

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

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

  714.     }

  715. 

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

  717.     FILL_COMPONENT(0);

  718.     FILL_COMPONENT(1);

  719.     FILL_COMPONENT(2);

  720.     if (desc->flags & AV_PIX_FMT_FLAG_ALPHA)

  721.         FILL_COMPONENT(3);

  722. 

  723. #undef FILL_COMPONENT

  724. }

  725. 

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

  727. {

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

  729.     GLint result;

  730.     if (!shader) {

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

  732.         return 0;

  733.     }

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

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

  736. 

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

  738.     if (!result) {

  739.         char *log;

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

  741.         if (result) {

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

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

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

  745.                 av_free(log);

  746.             }

  747.         }

  748.         goto fail;

  749.     }

  750.     OPENGL_ERROR_CHECK(opengl);

  751.     return shader;

  752.   fail:

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

  754.     return 0;

  755. }

  756. 

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

  758. {

  759.     GLuint vertex_shader = 0, fragment_shader = 0;

  760.     GLint result;

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

  762. 

  763.     if (!fragment_shader_code) {

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

  765.                av_get_pix_fmt_name(pix_fmt));

  766.         return AVERROR(EINVAL);

  767.     }

  768. 

  769.     vertex_shader = opengl_load_shader(opengl, FF_GL_VERTEX_SHADER,

  770.                                        FF_OPENGL_VERTEX_SHADER);

  771.     if (!vertex_shader) {

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

  773.         goto fail;

  774.     }

  775.     fragment_shader = opengl_load_shader(opengl, FF_GL_FRAGMENT_SHADER,

  776.                                          fragment_shader_code);

  777.     if (!fragment_shader) {

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

  779.         goto fail;

  780.     }

  781. 

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

  783.     if (!opengl->program)

  784.         goto fail;

  785. 

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

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

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

  789. 

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

  791.     if (!result) {

  792.         char *log;

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

  794.         if (result) {

  795.             log = av_malloc(result);

  796.             if (!log)

  797.                 goto fail;

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

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

  800.             av_free(log);

  801.         }

  802.         goto fail;

  803.     }

  804. 

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

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

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

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

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

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

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

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

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

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

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

  816. 

  817.     OPENGL_ERROR_CHECK(opengl);

  818.     return 0;

  819.   fail:

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

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

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

  823.     opengl->program = 0;

  824.     return AVERROR_EXTERNAL;

  825. }

  826. 

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

  828.                                             GLsizei width, GLsizei height)

  829. {

  830.     if (texture) {

  831.         int new_width, new_height;

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

  833.         glBindTexture(GL_TEXTURE_2D, texture);

  834.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

  835.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  836.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

  837.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

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

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

  840.         OPENGL_ERROR_CHECK(NULL);

  841.     }

  842.     return 0;

  843.   fail:

  844.     return AVERROR_EXTERNAL;

  845. }

  846. 

  847. static av_cold int opengl_prepare_vertex(AVFormatContext *s)

  848. {

  849.     OpenGLContext *opengl = s->priv_data;

  850.     int tex_w, tex_h;

  851. 

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

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

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

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

  856.     }

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

  858.     opengl_make_ortho(opengl->projection_matrix,

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

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

  861.                       1.0f, -1.0f);

  862.     opengl_make_identity(opengl->model_view_matrix);

  863. 

  864.     opengl_compute_display_area(s);

  865. 

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

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

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

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

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

  871. 

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

  873. 

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

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

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

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

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

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

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

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

  882. 

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

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

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

  886.     OPENGL_ERROR_CHECK(opengl);

  887.     return 0;

  888.   fail:

  889.     return AVERROR_EXTERNAL;

  890. }

  891. 

  892. static int opengl_prepare(OpenGLContext *opengl)

  893. {

  894.     int i;

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

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

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

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

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

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

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

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

  903.         }

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

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

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

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

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

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

  910. 

  911.     OPENGL_ERROR_CHECK(opengl);

  912.     return 0;

  913.   fail:

  914.     return AVERROR_EXTERNAL;

  915. }

  916. 

  917. static av_cold int opengl_write_trailer(AVFormatContext *h)

  918. {

  919.     OpenGLContext *opengl = h->priv_data;

  920. 

  921.     if (opengl->no_window &&

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

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

  924. 

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

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

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

  928. 

  929. #if HAVE_SDL

  930.     if (!opengl->no_window)

  931.         SDL_Quit();

  932. #endif

  933.     if (opengl->no_window &&

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

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

  936. 

  937.     return 0;

  938. }

  939. 

  940. static av_cold int opengl_init_context(OpenGLContext *opengl)

  941. {

  942.     int i, ret;

  943.     const AVPixFmtDescriptor *desc;

  944. 

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

  946.         goto fail;

  947. 

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

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

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

  951. 

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

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

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

  955.         ret = AVERROR_EXTERNAL;

  956.         goto fail;

  957.     }

  958. 

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

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

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

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

  963.         if (opengl->non_pow_2_textures) {

  964.             opengl->chroma_div_w = 1.0f;

  965.             opengl->chroma_div_h = 1.0f;

  966.         } else {

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

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

  969.         }

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

  971.             if (opengl->non_pow_2_textures)

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

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

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

  975.             else

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

  977.         if (has_alpha)

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

  979.     }

  980. 

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

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

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

  984. 

  985.     glEnable(GL_BLEND);

  986.     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  987. 

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

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

  990. 

  991.     ret = AVERROR_EXTERNAL;

  992.     OPENGL_ERROR_CHECK(opengl);

  993. 

  994.     return 0;

  995.   fail:

  996.     return ret;

  997. }

  998. 

  999. static av_cold int opengl_write_header(AVFormatContext *h)

  1000. {

  1001.     OpenGLContext *opengl = h->priv_data;

  1002.     AVStream *st;

  1003.     int ret;

  1004. 

  1005.     if (h->nb_streams != 1 ||

  1006.         h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO ||

  1007.         h->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {

  1008.         av_log(opengl, AV_LOG_ERROR, "Only a single video stream is supported.\n");

  1009.         return AVERROR(EINVAL);

  1010.     }

  1011.     st = h->streams[0];

  1012.     opengl->width = st->codec->width;

  1013.     opengl->height = st->codec->height;

  1014.     opengl->pix_fmt = st->codec->pix_fmt;

  1015. 

  1016.     if (!opengl->window_title && !opengl->no_window)

  1017.         opengl->window_title = av_strdup(h->filename);

  1018. 

  1019.     if (!opengl->no_window) {

  1020. #if HAVE_SDL

  1021.         if ((ret = opengl_sdl_create_window(h)) < 0)

  1022.             goto fail;

  1023. #else

  1024.         av_log(opengl, AV_LOG_ERROR, "FFmpeg is compiled without SDL. Cannot create default window.\n");

  1025.         ret = AVERROR(ENOSYS);

  1026.         goto fail;

  1027. #endif

  1028.     } else {

  1029.         if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_CREATE_WINDOW_BUFFER, NULL , 0)) < 0) {

  1030.             av_log(opengl, AV_LOG_ERROR, "Application failed to create window buffer.\n");

  1031.             goto fail;

  1032.         }

  1033.         if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {

  1034.             av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");

  1035.             goto fail;

  1036.         }

  1037.     }

  1038. 

  1039.     if ((ret = opengl_read_limits(opengl)) < 0)

  1040.         goto fail;

  1041. 

  1042.     if (opengl->width > opengl->max_texture_size || opengl->height > opengl->max_texture_size) {

  1043.         av_log(opengl, AV_LOG_ERROR, "Too big picture %dx%d, max supported size is %dx%d\n",

  1044.                opengl->width, opengl->height, opengl->max_texture_size, opengl->max_texture_size);

  1045.         ret = AVERROR(EINVAL);

  1046.         goto fail;

  1047.     }

  1048. 

  1049.     if (!opengl->no_window) {

  1050. #if HAVE_SDL

  1051.         if ((ret = opengl_sdl_load_procedures(opengl)) < 0)

  1052.             goto fail;

  1053. #endif

  1054.     } else if ((ret = opengl_load_procedures(opengl)) < 0)

  1055.         goto fail;

  1056. 

  1057.     opengl_fill_color_map(opengl);

  1058.     opengl_get_texture_params(opengl);

  1059. 

  1060.     if ((ret = opengl_init_context(opengl)) < 0)

  1061.         goto fail;

  1062. 

  1063.     if ((ret = opengl_prepare_vertex(h)) < 0)

  1064.         goto fail;

  1065. 

  1066.     glClear(GL_COLOR_BUFFER_BIT);

  1067. 

  1068. #if HAVE_SDL

  1069.     if (!opengl->no_window)

  1070.         SDL_GL_SwapBuffers();

  1071. #endif

  1072.     if (opengl->no_window &&

  1073.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {

  1074.         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");

  1075.         goto fail;

  1076.     }

  1077. 

  1078.     ret = AVERROR_EXTERNAL;

  1079.     OPENGL_ERROR_CHECK(opengl);

  1080.     return 0;

  1081. 

  1082.   fail:

  1083.     opengl_write_trailer(h);

  1084.     return ret;

  1085. }

  1086. 

  1087. static uint8_t* opengl_get_plane_pointer(OpenGLContext *opengl, AVPacket *pkt, int comp_index,

  1088.                                          const AVPixFmtDescriptor *desc)

  1089. {

  1090.     uint8_t *data = pkt->data;

  1091.     int wordsize = opengl_type_size(opengl->type);

  1092.     int width_chroma = FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);

  1093.     int height_chroma = FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);

  1094.     int plane = desc->comp[comp_index].plane;

  1095. 

  1096.     switch(plane) {

  1097.     case 0:

  1098.         break;

  1099.     case 1:

  1100.         data += opengl->width * opengl->height * wordsize;

  1101.         break;

  1102.     case 2:

  1103.         data += opengl->width * opengl->height * wordsize;

  1104.         data += width_chroma * height_chroma * wordsize;

  1105.         break;

  1106.     case 3:

  1107.         data += opengl->width * opengl->height * wordsize;

  1108.         data += 2 * width_chroma * height_chroma * wordsize;

  1109.         break;

  1110.     default:

  1111.         return NULL;

  1112.     }

  1113.     return data;

  1114. }

  1115. 

  1116. static int opengl_draw(AVFormatContext *h, AVPacket *pkt, int repaint)

  1117. {

  1118.     OpenGLContext *opengl = h->priv_data;

  1119.     enum AVPixelFormat pix_fmt = h->streams[0]->codec->pix_fmt;

  1120.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

  1121.     int ret;

  1122. 

  1123. #if HAVE_SDL

  1124.     if (!opengl->no_window && (ret = opengl_sdl_process_events(h)) < 0)

  1125.         goto fail;

  1126. #endif

  1127.     if (opengl->no_window &&

  1128.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {

  1129.         av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");

  1130.         goto fail;

  1131.     }

  1132. 

  1133.     glClear(GL_COLOR_BUFFER_BIT);

  1134. 

  1135.     if (!repaint) {

  1136.         glBindTexture(GL_TEXTURE_2D, opengl->texture_name[0]);

  1137.         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, opengl->width, opengl->height, opengl->format, opengl->type,

  1138.                         opengl_get_plane_pointer(opengl, pkt, 0, desc));

  1139.         if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {

  1140.             int width_chroma = FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);

  1141.             int height_chroma = FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);

  1142.             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[1]);

  1143.             glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_chroma, height_chroma, opengl->format, opengl->type,

  1144.                             opengl_get_plane_pointer(opengl, pkt, 1, desc));

  1145.             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[2]);

  1146.             glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_chroma, height_chroma, opengl->format, opengl->type,

  1147.                             opengl_get_plane_pointer(opengl, pkt, 2, desc));

  1148.             if (desc->flags & AV_PIX_FMT_FLAG_ALPHA) {

  1149.                 glBindTexture(GL_TEXTURE_2D, opengl->texture_name[3]);

  1150.                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, opengl->width, opengl->height, opengl->format, opengl->type,

  1151.                                 opengl_get_plane_pointer(opengl, pkt, 3, desc));

  1152.             }

  1153.         }

  1154.     }

  1155.     ret = AVERROR_EXTERNAL;

  1156.     OPENGL_ERROR_CHECK(opengl);

  1157. 

  1158.     if ((ret = opengl_prepare(opengl)) < 0)

  1159.         goto fail;

  1160. 

  1161.     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);

  1162.     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);

  1163.     opengl->glprocs.glVertexAttribPointer(opengl->position_attrib, 3, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 0);

  1164.     opengl->glprocs.glEnableVertexAttribArray(opengl->position_attrib);

  1165.     opengl->glprocs.glVertexAttribPointer(opengl->texture_coords_attrib, 2, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 12);

  1166.     opengl->glprocs.glEnableVertexAttribArray(opengl->texture_coords_attrib);

  1167. 

  1168.     glDrawElements(GL_TRIANGLES, FF_ARRAY_ELEMS(g_index), GL_UNSIGNED_SHORT, 0);

  1169. 

  1170.     ret = AVERROR_EXTERNAL;

  1171.     OPENGL_ERROR_CHECK(opengl);

  1172. 

  1173. #if HAVE_SDL

  1174.     if (!opengl->no_window)

  1175.         SDL_GL_SwapBuffers();

  1176. #endif

  1177.     if (opengl->no_window &&

  1178.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {

  1179.         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");

  1180.         goto fail;

  1181.     }

  1182. 

  1183.     return 0;

  1184.   fail:

  1185.     return ret;

  1186. }

  1187. 

  1188. static int opengl_write_packet(AVFormatContext *h, AVPacket *pkt)

  1189. {

  1190.     return opengl_draw(h, pkt, 0);

  1191. }

  1192. 

  1193. #define OFFSET(x) offsetof(OpenGLContext, x)

  1194. #define ENC AV_OPT_FLAG_ENCODING_PARAM

  1195. static const AVOption options[] = {

  1196.     { "background",   "set background color",   OFFSET(background),   AV_OPT_TYPE_COLOR,  {.str = "black"}, CHAR_MIN, CHAR_MAX, ENC },

  1197.     { "no_window",    "disable default window", OFFSET(no_window),    AV_OPT_TYPE_INT,    {.i64 = 0}, INT_MIN, INT_MAX, ENC },

  1198.     { "window_title", "set window title",       OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, ENC },

  1199.     { NULL }

  1200. };

  1201. 

  1202. static const AVClass opengl_class = {

  1203.     .class_name = "opengl outdev",

  1204.     .item_name  = av_default_item_name,

  1205.     .option     = options,

  1206.     .version    = LIBAVUTIL_VERSION_INT,

  1207. };

  1208. 

  1209. AVOutputFormat ff_opengl_muxer = {

  1210.     .name           = "opengl",

  1211.     .long_name      = NULL_IF_CONFIG_SMALL("OpenGL output"),

  1212.     .priv_data_size = sizeof(OpenGLContext),

  1213.     .audio_codec    = AV_CODEC_ID_NONE,

  1214.     .video_codec    = AV_CODEC_ID_RAWVIDEO,

  1215.     .write_header   = opengl_write_header,

  1216.     .write_packet   = opengl_write_packet,

  1217.     .write_trailer  = opengl_write_trailer,

  1218.     .control_message = opengl_control_message,

  1219.     .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,

  1220.     .priv_class     = &opengl_class,

  1221. };