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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 vertex_shader;              ///< Vertex shader

  192.     GLuint fragment_shader;            ///< Fragment shader for current pix_pmt

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

  194.     GLuint index_buffer;               ///< Index buffer

  195.     GLuint vertex_buffer;              ///< Vertex buffer

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

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

  198.     GLint model_view_matrix_location;

  199.     GLint color_map_location;

  200.     GLint chroma_div_w_location;

  201.     GLint chroma_div_h_location;

  202.     GLint texture_location[4];

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

  204.     GLint texture_coords_attrib;

  205. 

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

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

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

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

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

  211. 

  212.     /* Stream information */

  213.     GLenum format;

  214.     GLenum type;

  215.     int width;                         ///< Stream width

  216.     int height;                        ///< Stream height

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

  218.     int picture_width;                 ///< Rendered width

  219.     int picture_height;                ///< Rendered height

  220.     int window_width;

  221.     int window_height;

  222. } OpenGLContext;

  223. 

  224. static const struct OpenGLFormatDesc {

  225.     enum AVPixelFormat fixel_format;

  226.     const char * const * fragment_shader;

  227.     GLenum format;

  228.     GLenum type;

  229. } opengl_format_desc[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  268.     { AV_PIX_FMT_NONE,       NULL }

  269. };

  270. 

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

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

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

  274. 

  275. static av_cold void opengl_deinit_context(OpenGLContext *opengl)

  276. {

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

  278.     opengl->texture_name[0] = opengl->texture_name[1] =

  279.     opengl->texture_name[2] = opengl->texture_name[3] = 0;

  280.     if (opengl->glprocs.glUseProgram)

  281.         opengl->glprocs.glUseProgram(0);

  282.     if (opengl->glprocs.glDeleteProgram) {

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

  284.         opengl->program = 0;

  285.     }

  286.     if (opengl->glprocs.glDeleteShader) {

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

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

  289.         opengl->vertex_shader = opengl->fragment_shader = 0;

  290.     }

  291.     if (opengl->glprocs.glBindBuffer) {

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

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

  294.     }

  295.     if (opengl->glprocs.glDeleteBuffers) {

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

  297.         opengl->vertex_buffer = opengl->index_buffer = 0;

  298.     }

  299. }

  300. 

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

  302. {

  303.     int ret = 0;

  304.     OpenGLContext *opengl = h->priv_data;

  305.     opengl->window_width = width;

  306.     opengl->window_height = height;

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

  308.     if (opengl->max_viewport_width) {

  309.         if (opengl->no_window &&

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

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

  312.             goto end;

  313.         }

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

  315.             goto end;

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

  317.     }

  318.   end:

  319.     return ret;

  320. }

  321. 

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

  323. {

  324.     OpenGLContext *opengl = h->priv_data;

  325.     switch(type) {

  326.     case AV_APP_TO_DEV_WINDOW_SIZE:

  327.         if (data) {

  328.             AVDeviceRect *message = data;

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

  330.         }

  331.         return AVERROR(EINVAL);

  332.     case AV_APP_TO_DEV_WINDOW_REPAINT:

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

  334.     }

  335.     return AVERROR(ENOSYS);

  336. }

  337. 

  338. #if HAVE_SDL

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

  340. {

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

  342.                                        32, SDL_OPENGL | SDL_RESIZABLE);

  343.     if (!opengl->surface) {

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

  345.         return AVERROR_EXTERNAL;

  346.     }

  347.     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);

  348.     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);

  349.     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);

  350.     SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);

  351.     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

  352.     return 0;

  353. }

  354. 

  355. static int opengl_sdl_process_events(AVFormatContext *h)

  356. {

  357.     int ret;

  358.     OpenGLContext *opengl = h->priv_data;

  359.     SDL_Event event;

  360.     SDL_PumpEvents();

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

  362.         switch (event.type) {

  363.         case SDL_QUIT:

  364.             return AVERROR(EIO);

  365.         case SDL_KEYDOWN:

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

  367.             case SDLK_ESCAPE:

  368.             case SDLK_q:

  369.                 return AVERROR(EIO);

  370.             }

  371.             return 0;

  372.         case SDL_VIDEORESIZE: {

  373.             char buffer[100];

  374.             int reinit;

  375.             AVDeviceRect message;

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

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

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

  379.             if (reinit) {

  380.                 opengl_deinit_context(opengl);

  381.             }

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

  383.                 return ret;

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

  385.                 return ret;

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

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

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

  389.             }

  390.         }

  391.     }

  392.     return 0;

  393. }

  394. 

  395. static int av_cold opengl_sdl_create_window(AVFormatContext *h)

  396. {

  397.     int ret;

  398.     char buffer[100];

  399.     OpenGLContext *opengl = h->priv_data;

  400.     AVDeviceRect message;

  401.     if (SDL_Init(SDL_INIT_VIDEO)) {

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

  403.         return AVERROR_EXTERNAL;

  404.     }

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

  406.         return ret;

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

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

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

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

  411.     return 0;

  412. }

  413. 

  414. static int av_cold opengl_sdl_load_procedures(OpenGLContext *opengl)

  415. {

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

  417. 

  418. #define LOAD_OPENGL_FUN(name, type) \

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

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

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

  422.         return AVERROR(ENOSYS); \

  423.     }

  424. 

  425.     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)

  426.     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)

  427.     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)

  428.     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)

  429.     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)

  430.     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)

  431.     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)

  432.     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)

  433.     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)

  434.     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)

  435.     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)

  436.     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)

  437.     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)

  438.     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)

  439.     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)

  440.     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)

  441.     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)

  442.     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)

  443.     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)

  444.     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)

  445.     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)

  446.     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)

  447.     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)

  448.     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)

  449.     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)

  450. 

  451.     return 0;

  452. 

  453. #undef LOAD_OPENGL_FUN

  454. }

  455. #endif /* HAVE_SDL */

  456. 

  457. #if defined(__APPLE__)

  458. static int av_cold opengl_load_procedures(OpenGLContext *opengl)

  459. {

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

  461. 

  462.     procs->glActiveTexture = glActiveTexture;

  463.     procs->glGenBuffers = glGenBuffers;

  464.     procs->glDeleteBuffers = glDeleteBuffers;

  465.     procs->glBufferData = glBufferData;

  466.     procs->glBindBuffer = glBindBuffer;

  467.     procs->glGetAttribLocation = glGetAttribLocation;

  468.     procs->glGetUniformLocation = glGetUniformLocation;

  469.     procs->glUniform1f = glUniform1f;

  470.     procs->glUniform1i = glUniform1i;

  471.     procs->glUniformMatrix4fv = glUniformMatrix4fv;

  472.     procs->glCreateProgram = glCreateProgram;

  473.     procs->glDeleteProgram = glDeleteProgram;

  474.     procs->glUseProgram = glUseProgram;

  475.     procs->glLinkProgram = glLinkProgram;

  476.     procs->glGetProgramiv = glGetProgramiv;

  477.     procs->glGetProgramInfoLog = glGetProgramInfoLog;

  478.     procs->glAttachShader = glAttachShader;

  479.     procs->glCreateShader = glCreateShader;

  480.     procs->glDeleteShader = glDeleteShader;

  481.     procs->glCompileShader = glCompileShader;

  482.     procs->glShaderSource = glShaderSource;

  483.     procs->glGetShaderiv = glGetShaderiv;

  484.     procs->glGetShaderInfoLog = glGetShaderInfoLog;

  485.     procs->glEnableVertexAttribArray = glEnableVertexAttribArray;

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

  487.     return 0;

  488. }

  489. #else

  490. static int av_cold opengl_load_procedures(OpenGLContext *opengl)

  491. {

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

  493. 

  494. #if HAVE_GLXGETPROCADDRESS

  495. #define SelectedGetProcAddress glXGetProcAddress

  496. #elif HAVE_WGLGETPROCADDRESS

  497. #define SelectedGetProcAddress wglGetProcAddress

  498. #endif

  499. 

  500. #define LOAD_OPENGL_FUN(name, type) \

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

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

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

  504.         return AVERROR(ENOSYS); \

  505.     }

  506. 

  507.     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)

  508.     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)

  509.     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)

  510.     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)

  511.     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)

  512.     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)

  513.     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)

  514.     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)

  515.     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)

  516.     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)

  517.     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)

  518.     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)

  519.     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)

  520.     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)

  521.     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)

  522.     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)

  523.     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)

  524.     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)

  525.     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)

  526.     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)

  527.     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)

  528.     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)

  529.     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)

  530.     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)

  531.     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)

  532. 

  533.     return 0;

  534. 

  535. #undef SelectedGetProcAddress

  536. #undef LOAD_OPENGL_FUN

  537. }

  538. #endif

  539. 

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

  541. {

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

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

  544. }

  545. 

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

  547.                                                float left,   float right,

  548.                                                float bottom, float top,

  549.                                                float nearZ,  float farZ)

  550. {

  551.     float ral = right + left;

  552.     float rsl = right - left;

  553.     float tab = top + bottom;

  554.     float tsb = top - bottom;

  555.     float fan = farZ + nearZ;

  556.     float fsn = farZ - nearZ;

  557. 

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

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

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

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

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

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

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

  565.     matrix[15] = 1.0f;

  566. }

  567. 

  568. static av_cold int opengl_read_limits(OpenGLContext *opengl)

  569. {

  570.     static const struct{

  571.         const char *extention;

  572.         int major;

  573.         int minor;

  574.     } required_extensions[] = {

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

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

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

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

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

  580.         { NULL,                          0, 0 }

  581.     };

  582.     int i, major, minor;

  583.     const char *extensions, *version;

  584. 

  585.     version = glGetString(GL_VERSION);

  586.     extensions = glGetString(GL_EXTENSIONS);

  587. 

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

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

  590. 

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

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

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

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

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

  596.                    required_extensions[i].extention);

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

  598.             return AVERROR(ENOSYS);

  599.         }

  600.     }

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

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

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

  604. 

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

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

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

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

  609. 

  610.     OPENGL_ERROR_CHECK(opengl);

  611.     return 0;

  612.   fail:

  613.     return AVERROR_EXTERNAL;

  614. }

  615. 

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

  617. {

  618.     int i;

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

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

  621.             return *opengl_format_desc[i].fragment_shader;

  622.     }

  623.     return NULL;

  624. }

  625. 

  626. static av_always_inline int opengl_type_size(GLenum type)

  627. {

  628.     switch(type) {

  629.     case GL_UNSIGNED_SHORT:

  630.     case FF_GL_UNSIGNED_SHORT_1_5_5_5_REV:

  631.     case GL_UNSIGNED_SHORT_5_6_5:

  632.         return 2;

  633.     case GL_UNSIGNED_BYTE:

  634.     case FF_GL_UNSIGNED_BYTE_3_3_2:

  635.     case FF_GL_UNSIGNED_BYTE_2_3_3_REV:

  636.     default:

  637.         break;

  638.     }

  639.     return 1;

  640. }

  641. 

  642. static av_cold void opengl_get_texture_params(OpenGLContext *opengl)

  643. {

  644.     int i;

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

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

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

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

  649.             break;

  650.         }

  651.     }

  652. }

  653. 

  654. static void opengl_compute_display_area(AVFormatContext *s)

  655. {

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

  657.     OpenGLContext *opengl = s->priv_data;

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

  659.     AVCodecContext *encctx = st->codec;

  660. 

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

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

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

  664. 

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

  666.     /* fit in the window */

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

  668.         /* fit in width */

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

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

  671.     } else {

  672.         /* fit in height */

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

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

  675.     }

  676. }

  677. 

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

  679.                                             int *out_width, int *out_height)

  680. {

  681.     if (opengl->non_pow_2_textures) {

  682.         *out_width = in_width;

  683.         *out_height = in_height;

  684.     } else {

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

  686.         unsigned power_of_2 = 1;

  687.         while (power_of_2 < max)

  688.             power_of_2 *= 2;

  689.         *out_height = power_of_2;

  690.         *out_width = power_of_2;

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

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

  693.     }

  694. }

  695. 

  696. static av_cold void opengl_fill_color_map(OpenGLContext *opengl)

  697. {

  698.     const AVPixFmtDescriptor *desc;

  699.     int shift;

  700.     enum AVPixelFormat pix_fmt = opengl->pix_fmt;

  701. 

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

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

  704.         pix_fmt == AV_PIX_FMT_BGR8   || pix_fmt == AV_PIX_FMT_RGB8)

  705.         pix_fmt = AV_PIX_FMT_RGB24;

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

  707.         pix_fmt = AV_PIX_FMT_BGR24;

  708. 

  709.     desc = av_pix_fmt_desc_get(pix_fmt);

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

  711.         return;

  712. 

  713. #define FILL_COMPONENT(i) { \

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

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

  716.     }

  717. 

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

  719.     FILL_COMPONENT(0);

  720.     FILL_COMPONENT(1);

  721.     FILL_COMPONENT(2);

  722.     if (desc->flags & AV_PIX_FMT_FLAG_ALPHA)

  723.         FILL_COMPONENT(3);

  724. 

  725. #undef FILL_COMPONENT

  726. }

  727. 

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

  729. {

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

  731.     GLint result;

  732.     if (!shader) {

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

  734.         return 0;

  735.     }

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

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

  738. 

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

  740.     if (!result) {

  741.         char *log;

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

  743.         if (result) {

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

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

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

  747.                 av_free(log);

  748.             }

  749.         }

  750.         goto fail;

  751.     }

  752.     OPENGL_ERROR_CHECK(opengl);

  753.     return shader;

  754.   fail:

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

  756.     return 0;

  757. }

  758. 

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

  760. {

  761.     GLint result;

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

  763. 

  764.     if (!fragment_shader_code) {

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

  766.                av_get_pix_fmt_name(pix_fmt));

  767.         return AVERROR(EINVAL);

  768.     }

  769. 

  770.     opengl->vertex_shader = opengl_load_shader(opengl, FF_GL_VERTEX_SHADER,

  771.                                                FF_OPENGL_VERTEX_SHADER);

  772.     if (!opengl->vertex_shader) {

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

  774.         goto fail;

  775.     }

  776.     opengl->fragment_shader = opengl_load_shader(opengl, FF_GL_FRAGMENT_SHADER,

  777.                                                  fragment_shader_code);

  778.     if (!opengl->fragment_shader) {

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

  780.         goto fail;

  781.     }

  782. 

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

  784.     if (!opengl->program)

  785.         goto fail;

  786. 

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

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

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

  790. 

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

  792.     if (!result) {

  793.         char *log;

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

  795.         if (result) {

  796.             log = av_malloc(result);

  797.             if (!log)

  798.                 goto fail;

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

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

  801.             av_free(log);

  802.         }

  803.         goto fail;

  804.     }

  805. 

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

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

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

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

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

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

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

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

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

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

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

  817. 

  818.     OPENGL_ERROR_CHECK(opengl);

  819.     return 0;

  820.   fail:

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

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

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

  824.     opengl->fragment_shader = opengl->vertex_shader = opengl->program = 0;

  825.     return AVERROR_EXTERNAL;

  826. }

  827. 

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

  829.                                             GLsizei width, GLsizei height)

  830. {

  831.     if (texture) {

  832.         int new_width, new_height;

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

  834.         glBindTexture(GL_TEXTURE_2D, texture);

  835.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

  836.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  837.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

  838.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

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

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

  841.         OPENGL_ERROR_CHECK(NULL);

  842.     }

  843.     return 0;

  844.   fail:

  845.     return AVERROR_EXTERNAL;

  846. }

  847. 

  848. static av_cold int opengl_prepare_vertex(AVFormatContext *s)

  849. {

  850.     OpenGLContext *opengl = s->priv_data;

  851.     int tex_w, tex_h;

  852. 

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

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

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

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

  857.     }

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

  859.     opengl_make_ortho(opengl->projection_matrix,

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

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

  862.                       1.0f, -1.0f);

  863.     opengl_make_identity(opengl->model_view_matrix);

  864. 

  865.     opengl_compute_display_area(s);

  866. 

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

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

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

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

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

  872. 

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

  874. 

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

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

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

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

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

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

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

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

  883. 

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

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

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

  887.     OPENGL_ERROR_CHECK(opengl);

  888.     return 0;

  889.   fail:

  890.     return AVERROR_EXTERNAL;

  891. }

  892. 

  893. static int opengl_prepare(OpenGLContext *opengl)

  894. {

  895.     int i;

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

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

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

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

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

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

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

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

  904.         }

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

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

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

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

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

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

  911. 

  912.     OPENGL_ERROR_CHECK(opengl);

  913.     return 0;

  914.   fail:

  915.     return AVERROR_EXTERNAL;

  916. }

  917. 

  918. static int opengl_create_window(AVFormatContext *h)

  919. {

  920.     OpenGLContext *opengl = h->priv_data;

  921.     int ret;

  922. 

  923.     if (!opengl->no_window) {

  924. #if HAVE_SDL

  925.         if ((ret = opengl_sdl_create_window(h)) < 0) {

  926.             av_log(opengl, AV_LOG_ERROR, "Cannot create default SDL window.\n");

  927.             return ret;

  928.         }

  929. #else

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

  931.         return AVERROR(ENOSYS);

  932. #endif

  933.     } else {

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

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

  936.             return ret;

  937.         }

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

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

  940.             return ret;

  941.         }

  942.     }

  943.     return 0;

  944. }

  945. 

  946. static int opengl_release_window(AVFormatContext *h)

  947. {

  948.     int ret;

  949.     OpenGLContext *opengl = h->priv_data;

  950.     if (!opengl->no_window) {

  951. #if HAVE_SDL

  952.         SDL_Quit();

  953. #endif

  954.     } else if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER, NULL , 0) < 0)) {

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

  956.         return ret;

  957.     }

  958.     return 0;

  959. }

  960. 

  961. static av_cold int opengl_write_trailer(AVFormatContext *h)

  962. {

  963.     OpenGLContext *opengl = h->priv_data;

  964. 

  965.     if (opengl->no_window &&

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

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

  968. 

  969.     opengl_deinit_context(opengl);

  970.     opengl_release_window(h);

  971. 

  972.     return 0;

  973. }

  974. 

  975. static av_cold int opengl_init_context(OpenGLContext *opengl)

  976. {

  977.     int i, ret;

  978.     const AVPixFmtDescriptor *desc;

  979. 

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

  981.         goto fail;

  982. 

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

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

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

  986. 

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

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

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

  990.         ret = AVERROR_EXTERNAL;

  991.         goto fail;

  992.     }

  993. 

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

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

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

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

  998.         if (opengl->non_pow_2_textures) {

  999.             opengl->chroma_div_w = 1.0f;

  1000.             opengl->chroma_div_h = 1.0f;

  1001.         } else {

  1002.             opengl->chroma_div_w = 1 << desc->log2_chroma_w;

  1003.             opengl->chroma_div_h = 1 << desc->log2_chroma_h;

  1004.         }

  1005.         for (i = 1; i < num_planes; i++)

  1006.             if (opengl->non_pow_2_textures)

  1007.                 opengl_configure_texture(opengl, opengl->texture_name[i],

  1008.                         FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w),

  1009.                         FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h));

  1010.             else

  1011.                 opengl_configure_texture(opengl, opengl->texture_name[i], opengl->width, opengl->height);

  1012.         if (has_alpha)

  1013.             opengl_configure_texture(opengl, opengl->texture_name[3], opengl->width, opengl->height);

  1014.     }

  1015. 

  1016.     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);

  1017.     opengl->glprocs.glBufferData(FF_GL_ELEMENT_ARRAY_BUFFER, sizeof(g_index), g_index, FF_GL_STATIC_DRAW);

  1018.     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, 0);

  1019. 

  1020.     glEnable(GL_BLEND);

  1021.     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  1022. 

  1023.     glClearColor((float)opengl->background[0] / 255.0f, (float)opengl->background[1] / 255.0f,

  1024.                  (float)opengl->background[2] / 255.0f, 1.0f);

  1025. 

  1026.     ret = AVERROR_EXTERNAL;

  1027.     OPENGL_ERROR_CHECK(opengl);

  1028. 

  1029.     return 0;

  1030.   fail:

  1031.     return ret;

  1032. }

  1033. 

  1034. static av_cold int opengl_write_header(AVFormatContext *h)

  1035. {

  1036.     OpenGLContext *opengl = h->priv_data;

  1037.     AVStream *st;

  1038.     int ret;

  1039. 

  1040.     if (h->nb_streams != 1 ||

  1041.         h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO ||

  1042.         h->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {

  1043.         av_log(opengl, AV_LOG_ERROR, "Only a single video stream is supported.\n");

  1044.         return AVERROR(EINVAL);

  1045.     }

  1046.     st = h->streams[0];

  1047.     opengl->width = st->codec->width;

  1048.     opengl->height = st->codec->height;

  1049.     opengl->pix_fmt = st->codec->pix_fmt;

  1050. 

  1051.     if (!opengl->window_title && !opengl->no_window)

  1052.         opengl->window_title = av_strdup(h->filename);

  1053. 

  1054.     if ((ret = opengl_create_window(h)))

  1055.         goto fail;

  1056. 

  1057.     if ((ret = opengl_read_limits(opengl)) < 0)

  1058.         goto fail;

  1059. 

  1060.     if (opengl->width > opengl->max_texture_size || opengl->height > opengl->max_texture_size) {

  1061.         av_log(opengl, AV_LOG_ERROR, "Too big picture %dx%d, max supported size is %dx%d\n",

  1062.                opengl->width, opengl->height, opengl->max_texture_size, opengl->max_texture_size);

  1063.         ret = AVERROR(EINVAL);

  1064.         goto fail;

  1065.     }

  1066. 

  1067.     if (!opengl->no_window) {

  1068. #if HAVE_SDL

  1069.         if ((ret = opengl_sdl_load_procedures(opengl)) < 0)

  1070.             goto fail;

  1071. #endif

  1072.     } else if ((ret = opengl_load_procedures(opengl)) < 0)

  1073.         goto fail;

  1074. 

  1075.     opengl_fill_color_map(opengl);

  1076.     opengl_get_texture_params(opengl);

  1077. 

  1078.     if ((ret = opengl_init_context(opengl)) < 0)

  1079.         goto fail;

  1080. 

  1081.     if ((ret = opengl_prepare_vertex(h)) < 0)

  1082.         goto fail;

  1083. 

  1084.     glClear(GL_COLOR_BUFFER_BIT);

  1085. 

  1086. #if HAVE_SDL

  1087.     if (!opengl->no_window)

  1088.         SDL_GL_SwapBuffers();

  1089. #endif

  1090.     if (opengl->no_window &&

  1091.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {

  1092.         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");

  1093.         goto fail;

  1094.     }

  1095. 

  1096.     ret = AVERROR_EXTERNAL;

  1097.     OPENGL_ERROR_CHECK(opengl);

  1098.     return 0;

  1099. 

  1100.   fail:

  1101.     opengl_write_trailer(h);

  1102.     return ret;

  1103. }

  1104. 

  1105. static uint8_t* opengl_get_plane_pointer(OpenGLContext *opengl, AVPacket *pkt, int comp_index,

  1106.                                          const AVPixFmtDescriptor *desc)

  1107. {

  1108.     uint8_t *data = pkt->data;

  1109.     int wordsize = opengl_type_size(opengl->type);

  1110.     int width_chroma = FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);

  1111.     int height_chroma = FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);

  1112.     int plane = desc->comp[comp_index].plane;

  1113. 

  1114.     switch(plane) {

  1115.     case 0:

  1116.         break;

  1117.     case 1:

  1118.         data += opengl->width * opengl->height * wordsize;

  1119.         break;

  1120.     case 2:

  1121.         data += opengl->width * opengl->height * wordsize;

  1122.         data += width_chroma * height_chroma * wordsize;

  1123.         break;

  1124.     case 3:

  1125.         data += opengl->width * opengl->height * wordsize;

  1126.         data += 2 * width_chroma * height_chroma * wordsize;

  1127.         break;

  1128.     default:

  1129.         return NULL;

  1130.     }

  1131.     return data;

  1132. }

  1133. 

  1134. static int opengl_draw(AVFormatContext *h, AVPacket *pkt, int repaint)

  1135. {

  1136.     OpenGLContext *opengl = h->priv_data;

  1137.     enum AVPixelFormat pix_fmt = h->streams[0]->codec->pix_fmt;

  1138.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

  1139.     int ret;

  1140. 

  1141. #if HAVE_SDL

  1142.     if (!opengl->no_window && (ret = opengl_sdl_process_events(h)) < 0)

  1143.         goto fail;

  1144. #endif

  1145.     if (opengl->no_window &&

  1146.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {

  1147.         av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");

  1148.         goto fail;

  1149.     }

  1150. 

  1151.     glClear(GL_COLOR_BUFFER_BIT);

  1152. 

  1153.     if (!repaint) {

  1154.         glBindTexture(GL_TEXTURE_2D, opengl->texture_name[0]);

  1155.         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, opengl->width, opengl->height, opengl->format, opengl->type,

  1156.                         opengl_get_plane_pointer(opengl, pkt, 0, desc));

  1157.         if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {

  1158.             int width_chroma = FF_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);

  1159.             int height_chroma = FF_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);

  1160.             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[1]);

  1161.             glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_chroma, height_chroma, opengl->format, opengl->type,

  1162.                             opengl_get_plane_pointer(opengl, pkt, 1, desc));

  1163.             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[2]);

  1164.             glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_chroma, height_chroma, opengl->format, opengl->type,

  1165.                             opengl_get_plane_pointer(opengl, pkt, 2, desc));

  1166.             if (desc->flags & AV_PIX_FMT_FLAG_ALPHA) {

  1167.                 glBindTexture(GL_TEXTURE_2D, opengl->texture_name[3]);

  1168.                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, opengl->width, opengl->height, opengl->format, opengl->type,

  1169.                                 opengl_get_plane_pointer(opengl, pkt, 3, desc));

  1170.             }

  1171.         }

  1172.     }

  1173.     ret = AVERROR_EXTERNAL;

  1174.     OPENGL_ERROR_CHECK(opengl);

  1175. 

  1176.     if ((ret = opengl_prepare(opengl)) < 0)

  1177.         goto fail;

  1178. 

  1179.     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);

  1180.     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);

  1181.     opengl->glprocs.glVertexAttribPointer(opengl->position_attrib, 3, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 0);

  1182.     opengl->glprocs.glEnableVertexAttribArray(opengl->position_attrib);

  1183.     opengl->glprocs.glVertexAttribPointer(opengl->texture_coords_attrib, 2, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 12);

  1184.     opengl->glprocs.glEnableVertexAttribArray(opengl->texture_coords_attrib);

  1185. 

  1186.     glDrawElements(GL_TRIANGLES, FF_ARRAY_ELEMS(g_index), GL_UNSIGNED_SHORT, 0);

  1187. 

  1188.     ret = AVERROR_EXTERNAL;

  1189.     OPENGL_ERROR_CHECK(opengl);

  1190. 

  1191. #if HAVE_SDL

  1192.     if (!opengl->no_window)

  1193.         SDL_GL_SwapBuffers();

  1194. #endif

  1195.     if (opengl->no_window &&

  1196.         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {

  1197.         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");

  1198.         goto fail;

  1199.     }

  1200. 

  1201.     return 0;

  1202.   fail:

  1203.     return ret;

  1204. }

  1205. 

  1206. static int opengl_write_packet(AVFormatContext *h, AVPacket *pkt)

  1207. {

  1208.     return opengl_draw(h, pkt, 0);

  1209. }

  1210. 

  1211. #define OFFSET(x) offsetof(OpenGLContext, x)

  1212. #define ENC AV_OPT_FLAG_ENCODING_PARAM

  1213. static const AVOption options[] = {

  1214.     { "background",   "set background color",   OFFSET(background),   AV_OPT_TYPE_COLOR,  {.str = "black"}, CHAR_MIN, CHAR_MAX, ENC },

  1215.     { "no_window",    "disable default window", OFFSET(no_window),    AV_OPT_TYPE_INT,    {.i64 = 0}, INT_MIN, INT_MAX, ENC },

  1216.     { "window_title", "set window title",       OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, ENC },

  1217.     { NULL }

  1218. };

  1219. 

  1220. static const AVClass opengl_class = {

  1221.     .class_name = "opengl outdev",

  1222.     .item_name  = av_default_item_name,

  1223.     .option     = options,

  1224.     .version    = LIBAVUTIL_VERSION_INT,

  1225. };

  1226. 

  1227. AVOutputFormat ff_opengl_muxer = {

  1228.     .name           = "opengl",

  1229.     .long_name      = NULL_IF_CONFIG_SMALL("OpenGL output"),

  1230.     .priv_data_size = sizeof(OpenGLContext),

  1231.     .audio_codec    = AV_CODEC_ID_NONE,

  1232.     .video_codec    = AV_CODEC_ID_RAWVIDEO,

  1233.     .write_header   = opengl_write_header,

  1234.     .write_packet   = opengl_write_packet,

  1235.     .write_trailer  = opengl_write_trailer,

  1236.     .control_message = opengl_control_message,

  1237.     .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,

  1238.     .priv_class     = &opengl_class,

  1239. };