git.sesse.net Git - ffmpeg/blob - libavdevice/opengl_enc.c

   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 <stddef.h>
  29
  30 #include "config.h"
  31
  32 #if HAVE_WINDOWS_H
  33 #define WIN32_LEAN_AND_MEAN
  34 #include <windows.h>
  35 #endif
  36 #if HAVE_OPENGL_GL3_H
  37 #include <OpenGL/gl3.h>
  38 #elif HAVE_ES2_GL_H
  39 #include <ES2/gl.h>
  40 #else
  41 #include <GL/gl.h>
  42 #include <GL/glext.h>
  43 #endif
  44 #if HAVE_GLXGETPROCADDRESS
  45 #include <GL/glx.h>
  46 #endif
  47
  48 #if CONFIG_SDL2
  49 #include <SDL.h>
  50 #endif
  51
  52 #include "libavutil/common.h"
  53 #include "libavutil/pixdesc.h"
  54 #include "libavutil/log.h"
  55 #include "libavutil/opt.h"
  56 #include "libavutil/avassert.h"
  57 #include "libavutil/avstring.h"
  58 #include "libavformat/avformat.h"
  59 #include "libavformat/internal.h"
  60 #include "libavdevice/avdevice.h"
  61 #include "opengl_enc_shaders.h"
  62
  63 #ifndef APIENTRY
  64 #define APIENTRY
  65 #endif
  66
  67 /* FF_GL_RED_COMPONENT is used for planar pixel types.
  68  * Only red component is sampled in shaders.
  69  * On some platforms GL_RED is not available and GL_LUMINANCE have to be used,
  70  * but since OpenGL 3.0 GL_LUMINANCE is deprecated.
  71  * GL_RED produces RGBA = value, 0, 0, 1.
  72  * GL_LUMINANCE produces RGBA = value, value, value, 1.
  73  * Note: GL_INTENSITY may also be used which produce RGBA = value, value, value, value. */
  74 #if defined(GL_RED)
  75 #define FF_GL_RED_COMPONENT GL_RED
  76 #elif defined(GL_LUMINANCE)
  77 #define FF_GL_RED_COMPONENT GL_LUMINANCE
  78 #else
  79 #define FF_GL_RED_COMPONENT 0x1903; //GL_RED
  80 #endif
  81
  82 /* Constants not defined for iOS */
  83 #define FF_GL_UNSIGNED_BYTE_3_3_2 0x8032
  84 #define FF_GL_UNSIGNED_BYTE_2_3_3_REV 0x8362
  85 #define FF_GL_UNSIGNED_SHORT_1_5_5_5_REV 0x8366
  86 #define FF_GL_UNPACK_ROW_LENGTH          0x0CF2
  87
  88 /* MinGW exposes only OpenGL 1.1 API */
  89 #define FF_GL_ARRAY_BUFFER                0x8892
  90 #define FF_GL_ELEMENT_ARRAY_BUFFER        0x8893
  91 #define FF_GL_STATIC_DRAW                 0x88E4
  92 #define FF_GL_FRAGMENT_SHADER             0x8B30
  93 #define FF_GL_VERTEX_SHADER               0x8B31
  94 #define FF_GL_COMPILE_STATUS              0x8B81
  95 #define FF_GL_LINK_STATUS                 0x8B82
  96 #define FF_GL_INFO_LOG_LENGTH             0x8B84
  97 typedef void   (APIENTRY *FF_PFNGLACTIVETEXTUREPROC) (GLenum texture);
  98 typedef void   (APIENTRY *FF_PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
  99 typedef void   (APIENTRY *FF_PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);
 100 typedef void   (APIENTRY *FF_PFNGLBUFFERDATAPROC) (GLenum target, ptrdiff_t size, const GLvoid *data, GLenum usage);
 101 typedef void   (APIENTRY *FF_PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
 102 typedef GLint  (APIENTRY *FF_PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const char *name);
 103 typedef void   (APIENTRY *FF_PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
 104 typedef void   (APIENTRY *FF_PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, uintptr_t pointer);
 105 typedef GLint  (APIENTRY *FF_PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const char *name);
 106 typedef void   (APIENTRY *FF_PFNGLUNIFORM1FPROC) (GLint location, GLfloat v0);
 107 typedef void   (APIENTRY *FF_PFNGLUNIFORM1IPROC) (GLint location, GLint v0);
 108 typedef void   (APIENTRY *FF_PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
 109 typedef GLuint (APIENTRY *FF_PFNGLCREATEPROGRAMPROC) (void);
 110 typedef void   (APIENTRY *FF_PFNGLDELETEPROGRAMPROC) (GLuint program);
 111 typedef void   (APIENTRY *FF_PFNGLUSEPROGRAMPROC) (GLuint program);
 112 typedef void   (APIENTRY *FF_PFNGLLINKPROGRAMPROC) (GLuint program);
 113 typedef void   (APIENTRY *FF_PFNGLGETPROGRAMIVPROC) (GLuint program, GLenum pname, GLint *params);
 114 typedef void   (APIENTRY *FF_PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, char *infoLog);
 115 typedef void   (APIENTRY *FF_PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader);
 116 typedef GLuint (APIENTRY *FF_PFNGLCREATESHADERPROC) (GLenum type);
 117 typedef void   (APIENTRY *FF_PFNGLDELETESHADERPROC) (GLuint shader);
 118 typedef void   (APIENTRY *FF_PFNGLCOMPILESHADERPROC) (GLuint shader);
 119 typedef void   (APIENTRY *FF_PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const char* *string, const GLint *length);
 120 typedef void   (APIENTRY *FF_PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);
 121 typedef void   (APIENTRY *FF_PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, char *infoLog);
 122
 123 typedef struct FFOpenGLFunctions {
 124     FF_PFNGLACTIVETEXTUREPROC glActiveTexture;                     //Require GL ARB multitexture
 125     FF_PFNGLGENBUFFERSPROC glGenBuffers;                           //Require GL_ARB_vertex_buffer_object
 126     FF_PFNGLDELETEBUFFERSPROC glDeleteBuffers;                     //Require GL_ARB_vertex_buffer_object
 127     FF_PFNGLBUFFERDATAPROC glBufferData;                           //Require GL_ARB_vertex_buffer_object
 128     FF_PFNGLBINDBUFFERPROC glBindBuffer;                           //Require GL_ARB_vertex_buffer_object
 129     FF_PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation;             //Require GL_ARB_vertex_shader
 130     FF_PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray; //Require GL_ARB_vertex_shader
 131     FF_PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer;         //Require GL_ARB_vertex_shader
 132     FF_PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;           //Require GL_ARB_shader_objects
 133     FF_PFNGLUNIFORM1FPROC glUniform1f;                             //Require GL_ARB_shader_objects
 134     FF_PFNGLUNIFORM1IPROC glUniform1i;                             //Require GL_ARB_shader_objects
 135     FF_PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv;               //Require GL_ARB_shader_objects
 136     FF_PFNGLCREATEPROGRAMPROC glCreateProgram;                     //Require GL_ARB_shader_objects
 137     FF_PFNGLDELETEPROGRAMPROC glDeleteProgram;                     //Require GL_ARB_shader_objects
 138     FF_PFNGLUSEPROGRAMPROC glUseProgram;                           //Require GL_ARB_shader_objects
 139     FF_PFNGLLINKPROGRAMPROC glLinkProgram;                         //Require GL_ARB_shader_objects
 140     FF_PFNGLGETPROGRAMIVPROC glGetProgramiv;                       //Require GL_ARB_shader_objects
 141     FF_PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;             //Require GL_ARB_shader_objects
 142     FF_PFNGLATTACHSHADERPROC glAttachShader;                       //Require GL_ARB_shader_objects
 143     FF_PFNGLCREATESHADERPROC glCreateShader;                       //Require GL_ARB_shader_objects
 144     FF_PFNGLDELETESHADERPROC glDeleteShader;                       //Require GL_ARB_shader_objects
 145     FF_PFNGLCOMPILESHADERPROC glCompileShader;                     //Require GL_ARB_shader_objects
 146     FF_PFNGLSHADERSOURCEPROC glShaderSource;                       //Require GL_ARB_shader_objects
 147     FF_PFNGLGETSHADERIVPROC glGetShaderiv;                         //Require GL_ARB_shader_objects
 148     FF_PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;               //Require GL_ARB_shader_objects
 149 } FFOpenGLFunctions;
 150
 151 #define OPENGL_ERROR_CHECK(ctx) \
 152 {\
 153     GLenum err_code; \
 154     if ((err_code = glGetError()) != GL_NO_ERROR) { \
 155         av_log(ctx, AV_LOG_ERROR, "OpenGL error occurred in '%s', line %d: %d\n", __FUNCTION__, __LINE__, err_code); \
 156         goto fail; \
 157     } \
 158 }\
 159
 160 typedef struct OpenGLVertexInfo
 161 {
 162     float x, y, z;    ///<Position
 163     float s0, t0;     ///<Texture coords
 164 } OpenGLVertexInfo;
 165
 166 /* defines 2 triangles to display */
 167 static const GLushort g_index[6] =
 168 {
 169     0, 1, 2,
 170     0, 3, 2,
 171 };
 172
 173 typedef struct OpenGLContext {
 174     AVClass *class;                    ///< class for private options
 175
 176 #if CONFIG_SDL2
 177     SDL_Window *window;
 178     SDL_GLContext glcontext;
 179 #endif
 180     FFOpenGLFunctions glprocs;
 181
 182     int inited;                        ///< Set to 1 when write_header was successfully called.
 183     uint8_t background[4];             ///< Background color
 184     int no_window;                     ///< 0 for create default window
 185     char *window_title;                ///< Title of the window
 186
 187     /* OpenGL implementation limits */
 188     GLint max_texture_size;            ///< Maximum texture size
 189     GLint max_viewport_width;          ///< Maximum viewport size
 190     GLint max_viewport_height;         ///< Maximum viewport size
 191     int non_pow_2_textures;            ///< 1 when non power of 2 textures are supported
 192     int unpack_subimage;               ///< 1 when GL_EXT_unpack_subimage is available
 193
 194     /* Current OpenGL configuration */
 195     GLuint program;                    ///< Shader program
 196     GLuint vertex_shader;              ///< Vertex shader
 197     GLuint fragment_shader;            ///< Fragment shader for current pix_pmt
 198     GLuint texture_name[4];            ///< Textures' IDs
 199     GLuint index_buffer;               ///< Index buffer
 200     GLuint vertex_buffer;              ///< Vertex buffer
 201     OpenGLVertexInfo vertex[4];        ///< VBO
 202     GLint projection_matrix_location;  ///< Uniforms' locations
 203     GLint model_view_matrix_location;
 204     GLint color_map_location;
 205     GLint chroma_div_w_location;
 206     GLint chroma_div_h_location;
 207     GLint texture_location[4];
 208     GLint position_attrib;             ///< Attibutes' locations
 209     GLint texture_coords_attrib;
 210
 211     GLfloat projection_matrix[16];     ///< Projection matrix
 212     GLfloat model_view_matrix[16];     ///< Modev view matrix
 213     GLfloat color_map[16];             ///< RGBA color map matrix
 214     GLfloat chroma_div_w;              ///< Chroma subsampling w ratio
 215     GLfloat chroma_div_h;              ///< Chroma subsampling h ratio
 216
 217     /* Stream information */
 218     GLenum format;
 219     GLenum type;
 220     int width;                         ///< Stream width
 221     int height;                        ///< Stream height
 222     enum AVPixelFormat pix_fmt;        ///< Stream pixel format
 223     int picture_width;                 ///< Rendered width
 224     int picture_height;                ///< Rendered height
 225     int window_width;
 226     int window_height;
 227 } OpenGLContext;
 228
 229 static const struct OpenGLFormatDesc {
 230     enum AVPixelFormat fixel_format;
 231     const char * const * fragment_shader;
 232     GLenum format;
 233     GLenum type;
 234 } opengl_format_desc[] = {
 235     { AV_PIX_FMT_YUV420P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 236     { AV_PIX_FMT_YUV444P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 237     { AV_PIX_FMT_YUV422P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 238     { AV_PIX_FMT_YUV410P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 239     { AV_PIX_FMT_YUV411P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 240     { AV_PIX_FMT_YUV440P,    &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 241     { AV_PIX_FMT_YUV420P16,  &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 242     { AV_PIX_FMT_YUV422P16,  &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 243     { AV_PIX_FMT_YUV444P16,  &FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 244     { AV_PIX_FMT_YUVA420P,   &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 245     { AV_PIX_FMT_YUVA444P,   &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 246     { AV_PIX_FMT_YUVA422P,   &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 247     { AV_PIX_FMT_YUVA420P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 248     { AV_PIX_FMT_YUVA422P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 249     { AV_PIX_FMT_YUVA444P16, &FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 250     { AV_PIX_FMT_RGB24,      &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_BYTE },
 251     { AV_PIX_FMT_BGR24,      &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_BYTE },
 252     { AV_PIX_FMT_0RGB,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },
 253     { AV_PIX_FMT_RGB0,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },
 254     { AV_PIX_FMT_0BGR,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },
 255     { AV_PIX_FMT_BGR0,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, GL_UNSIGNED_BYTE },
 256     { AV_PIX_FMT_RGB565,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_SHORT_5_6_5 },
 257     { AV_PIX_FMT_BGR565,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_SHORT_5_6_5 },
 258     { AV_PIX_FMT_RGB555,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, FF_GL_UNSIGNED_SHORT_1_5_5_5_REV },
 259     { AV_PIX_FMT_BGR555,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGBA, FF_GL_UNSIGNED_SHORT_1_5_5_5_REV },
 260     { AV_PIX_FMT_RGB8,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, FF_GL_UNSIGNED_BYTE_3_3_2 },
 261     { AV_PIX_FMT_BGR8,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, FF_GL_UNSIGNED_BYTE_2_3_3_REV },
 262     { AV_PIX_FMT_RGB48,      &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_SHORT },
 263     { AV_PIX_FMT_BGR48,      &FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET,  GL_RGB, GL_UNSIGNED_SHORT },
 264     { AV_PIX_FMT_ARGB,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
 265     { AV_PIX_FMT_RGBA,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
 266     { AV_PIX_FMT_ABGR,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
 267     { AV_PIX_FMT_BGRA,       &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_BYTE },
 268     { AV_PIX_FMT_RGBA64,     &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_SHORT },
 269     { AV_PIX_FMT_BGRA64,     &FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET, GL_RGBA, GL_UNSIGNED_SHORT },
 270     { AV_PIX_FMT_GBRP,       &FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 271     { AV_PIX_FMT_GBRP16,     &FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR,  FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 272     { AV_PIX_FMT_GBRAP,      &FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 273     { AV_PIX_FMT_GBRAP16,    &FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR, FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 274     { AV_PIX_FMT_GRAY8,      &FF_OPENGL_FRAGMENT_SHADER_GRAY,        FF_GL_RED_COMPONENT, GL_UNSIGNED_BYTE },
 275     { AV_PIX_FMT_GRAY16,     &FF_OPENGL_FRAGMENT_SHADER_GRAY,        FF_GL_RED_COMPONENT, GL_UNSIGNED_SHORT },
 276     { AV_PIX_FMT_NONE,       NULL }
 277 };
 278
 279 static av_cold int opengl_prepare_vertex(AVFormatContext *s);
 280 static int opengl_draw(AVFormatContext *h, void *intput, int repaint, int is_pkt);
 281 static av_cold int opengl_init_context(OpenGLContext *opengl);
 282
 283 static av_cold void opengl_deinit_context(OpenGLContext *opengl)
 284 {
 285     glDeleteTextures(4, opengl->texture_name);
 286     opengl->texture_name[0] = opengl->texture_name[1] =
 287     opengl->texture_name[2] = opengl->texture_name[3] = 0;
 288     if (opengl->glprocs.glUseProgram)
 289         opengl->glprocs.glUseProgram(0);
 290     if (opengl->glprocs.glDeleteProgram) {
 291         opengl->glprocs.glDeleteProgram(opengl->program);
 292         opengl->program = 0;
 293     }
 294     if (opengl->glprocs.glDeleteShader) {
 295         opengl->glprocs.glDeleteShader(opengl->vertex_shader);
 296         opengl->glprocs.glDeleteShader(opengl->fragment_shader);
 297         opengl->vertex_shader = opengl->fragment_shader = 0;
 298     }
 299     if (opengl->glprocs.glBindBuffer) {
 300         opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, 0);
 301         opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, 0);
 302     }
 303     if (opengl->glprocs.glDeleteBuffers) {
 304         opengl->glprocs.glDeleteBuffers(2, &opengl->index_buffer);
 305         opengl->vertex_buffer = opengl->index_buffer = 0;
 306     }
 307 }
 308
 309 static int opengl_resize(AVFormatContext *h, int width, int height)
 310 {
 311     int ret = 0;
 312     OpenGLContext *opengl = h->priv_data;
 313     opengl->window_width = width;
 314     opengl->window_height = height;
 315     if (opengl->inited) {
 316         if (opengl->no_window &&
 317             (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {
 318             av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
 319             goto end;
 320         }
 321         if ((ret = opengl_prepare_vertex(h)) < 0)
 322             goto end;
 323         ret = opengl_draw(h, NULL, 1, 0);
 324     }
 325   end:
 326     return ret;
 327 }
 328
 329 static int opengl_control_message(AVFormatContext *h, int type, void *data, size_t data_size)
 330 {
 331     OpenGLContext *opengl = h->priv_data;
 332     switch(type) {
 333     case AV_APP_TO_DEV_WINDOW_SIZE:
 334         if (data) {
 335             AVDeviceRect *message = data;
 336             return opengl_resize(h, message->width, message->height);
 337         }
 338         return AVERROR(EINVAL);
 339     case AV_APP_TO_DEV_WINDOW_REPAINT:
 340         return opengl_resize(h, opengl->window_width, opengl->window_height);
 341     }
 342     return AVERROR(ENOSYS);
 343 }
 344
 345 #if CONFIG_SDL2
 346 static int opengl_sdl_process_events(AVFormatContext *h)
 347 {
 348     OpenGLContext *opengl = h->priv_data;
 349     AVDeviceRect message;
 350     SDL_Event event;
 351     SDL_PumpEvents();
 352     while (SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT) > 0) {
 353         switch (event.type) {
 354         case SDL_QUIT:
 355             return AVERROR(EIO);
 356         case SDL_KEYDOWN:
 357             switch (event.key.keysym.sym) {
 358             case SDLK_ESCAPE:
 359             case SDLK_q:
 360                 return AVERROR(EIO);
 361             }
 362             return 0;
 363         case SDL_WINDOWEVENT:
 364             switch(event.window.event) {
 365             case SDL_WINDOWEVENT_RESIZED:
 366             case SDL_WINDOWEVENT_SIZE_CHANGED:
 367                 SDL_GL_GetDrawableSize(opengl->window, &message.width, &message.height);
 368                 return opengl_control_message(h, AV_APP_TO_DEV_WINDOW_SIZE, &message, sizeof(AVDeviceRect));
 369             default:
 370                 break;
 371             }
 372         }
 373     }
 374     return 0;
 375 }
 376
 377 static int av_cold opengl_sdl_create_window(AVFormatContext *h)
 378 {
 379     OpenGLContext *opengl = h->priv_data;
 380     AVDeviceRect message;
 381     if (SDL_Init(SDL_INIT_VIDEO)) {
 382         av_log(opengl, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
 383         return AVERROR_EXTERNAL;
 384     }
 385     opengl->window = SDL_CreateWindow(opengl->window_title,
 386                                       SDL_WINDOWPOS_UNDEFINED,
 387                                       SDL_WINDOWPOS_UNDEFINED,
 388                                       opengl->window_width, opengl->window_height,
 389                                       SDL_WINDOW_RESIZABLE | SDL_WINDOW_OPENGL);
 390     if (!opengl->window) {
 391         av_log(opengl, AV_LOG_ERROR, "Unable to create default window: %s\n", SDL_GetError());
 392         return AVERROR_EXTERNAL;
 393     }
 394     opengl->glcontext = SDL_GL_CreateContext(opengl->window);
 395     if (!opengl->glcontext) {
 396         av_log(opengl, AV_LOG_ERROR, "Unable to create OpenGL context on default window: %s\n", SDL_GetError());
 397         return AVERROR_EXTERNAL;
 398     }
 399     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
 400     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
 401     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
 402     SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
 403     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 404     av_log(opengl, AV_LOG_INFO, "SDL driver: '%s'.\n", SDL_GetCurrentVideoDriver());
 405     SDL_GL_GetDrawableSize(opengl->window, &message.width, &message.height);
 406     return opengl_control_message(h, AV_APP_TO_DEV_WINDOW_SIZE, &message, sizeof(AVDeviceRect));
 407 }
 408
 409 static int av_cold opengl_sdl_load_procedures(OpenGLContext *opengl)
 410 {
 411     FFOpenGLFunctions *procs = &opengl->glprocs;
 412
 413 #define LOAD_OPENGL_FUN(name, type) \
 414     procs->name = (type)SDL_GL_GetProcAddress(#name); \
 415     if (!procs->name) { \
 416         av_log(opengl, AV_LOG_ERROR, "Cannot load OpenGL function: '%s'\n", #name); \
 417         return AVERROR(ENOSYS); \
 418     }
 419
 420     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)
 421     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)
 422     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)
 423     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)
 424     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)
 425     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)
 426     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)
 427     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)
 428     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)
 429     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)
 430     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)
 431     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)
 432     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)
 433     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)
 434     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)
 435     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)
 436     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)
 437     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)
 438     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)
 439     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)
 440     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)
 441     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)
 442     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)
 443     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)
 444     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)
 445
 446     return 0;
 447
 448 #undef LOAD_OPENGL_FUN
 449 }
 450 #endif /* CONFIG_SDL2 */
 451
 452 #if defined(__APPLE__)
 453 static int av_cold opengl_load_procedures(OpenGLContext *opengl)
 454 {
 455     FFOpenGLFunctions *procs = &opengl->glprocs;
 456
 457 #if CONFIG_SDL2
 458     if (!opengl->no_window)
 459         return opengl_sdl_load_procedures(opengl);
 460 #endif
 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 #if CONFIG_SDL2
 508     if (!opengl->no_window)
 509         return opengl_sdl_load_procedures(opengl);
 510 #endif
 511
 512     LOAD_OPENGL_FUN(glActiveTexture, FF_PFNGLACTIVETEXTUREPROC)
 513     LOAD_OPENGL_FUN(glGenBuffers, FF_PFNGLGENBUFFERSPROC)
 514     LOAD_OPENGL_FUN(glDeleteBuffers, FF_PFNGLDELETEBUFFERSPROC)
 515     LOAD_OPENGL_FUN(glBufferData, FF_PFNGLBUFFERDATAPROC)
 516     LOAD_OPENGL_FUN(glBindBuffer, FF_PFNGLBINDBUFFERPROC)
 517     LOAD_OPENGL_FUN(glGetAttribLocation, FF_PFNGLGETATTRIBLOCATIONPROC)
 518     LOAD_OPENGL_FUN(glGetUniformLocation, FF_PFNGLGETUNIFORMLOCATIONPROC)
 519     LOAD_OPENGL_FUN(glUniform1f, FF_PFNGLUNIFORM1FPROC)
 520     LOAD_OPENGL_FUN(glUniform1i, FF_PFNGLUNIFORM1IPROC)
 521     LOAD_OPENGL_FUN(glUniformMatrix4fv, FF_PFNGLUNIFORMMATRIX4FVPROC)
 522     LOAD_OPENGL_FUN(glCreateProgram, FF_PFNGLCREATEPROGRAMPROC)
 523     LOAD_OPENGL_FUN(glDeleteProgram, FF_PFNGLDELETEPROGRAMPROC)
 524     LOAD_OPENGL_FUN(glUseProgram, FF_PFNGLUSEPROGRAMPROC)
 525     LOAD_OPENGL_FUN(glLinkProgram, FF_PFNGLLINKPROGRAMPROC)
 526     LOAD_OPENGL_FUN(glGetProgramiv, FF_PFNGLGETPROGRAMIVPROC)
 527     LOAD_OPENGL_FUN(glGetProgramInfoLog, FF_PFNGLGETPROGRAMINFOLOGPROC)
 528     LOAD_OPENGL_FUN(glAttachShader, FF_PFNGLATTACHSHADERPROC)
 529     LOAD_OPENGL_FUN(glCreateShader, FF_PFNGLCREATESHADERPROC)
 530     LOAD_OPENGL_FUN(glDeleteShader, FF_PFNGLDELETESHADERPROC)
 531     LOAD_OPENGL_FUN(glCompileShader, FF_PFNGLCOMPILESHADERPROC)
 532     LOAD_OPENGL_FUN(glShaderSource, FF_PFNGLSHADERSOURCEPROC)
 533     LOAD_OPENGL_FUN(glGetShaderiv, FF_PFNGLGETSHADERIVPROC)
 534     LOAD_OPENGL_FUN(glGetShaderInfoLog, FF_PFNGLGETSHADERINFOLOGPROC)
 535     LOAD_OPENGL_FUN(glEnableVertexAttribArray, FF_PFNGLENABLEVERTEXATTRIBARRAYPROC)
 536     LOAD_OPENGL_FUN(glVertexAttribPointer, FF_PFNGLVERTEXATTRIBPOINTERPROC)
 537
 538     return 0;
 539
 540 #undef SelectedGetProcAddress
 541 #undef LOAD_OPENGL_FUN
 542 }
 543 #endif
 544
 545 static void opengl_make_identity(float matrix[16])
 546 {
 547     memset(matrix, 0, 16 * sizeof(float));
 548     matrix[0] = matrix[5] = matrix[10] = matrix[15] = 1.0f;
 549 }
 550
 551 static void opengl_make_ortho(float matrix[16], float left, float right,
 552                               float bottom, float top, float nearZ, float farZ)
 553 {
 554     float ral = right + left;
 555     float rsl = right - left;
 556     float tab = top + bottom;
 557     float tsb = top - bottom;
 558     float fan = farZ + nearZ;
 559     float fsn = farZ - nearZ;
 560
 561     memset(matrix, 0, 16 * sizeof(float));
 562     matrix[0] = 2.0f / rsl;
 563     matrix[5] = 2.0f / tsb;
 564     matrix[10] = -2.0f / fsn;
 565     matrix[12] = -ral / rsl;
 566     matrix[13] = -tab / tsb;
 567     matrix[14] = -fan / fsn;
 568     matrix[15] = 1.0f;
 569 }
 570
 571 static av_cold int opengl_read_limits(AVFormatContext *h)
 572 {
 573     OpenGLContext *opengl = h->priv_data;
 574     static const struct{
 575         const char *extension;
 576         int major;
 577         int minor;
 578     } required_extensions[] = {
 579         { "GL_ARB_multitexture",         1, 3 },
 580         { "GL_ARB_vertex_buffer_object", 1, 5 }, //GLX_ARB_vertex_buffer_object
 581         { "GL_ARB_vertex_shader",        2, 0 },
 582         { "GL_ARB_fragment_shader",      2, 0 },
 583         { "GL_ARB_shader_objects",       2, 0 },
 584         { NULL,                          0, 0 }
 585     };
 586     int i, major, minor;
 587     const char *extensions, *version;
 588
 589     version = glGetString(GL_VERSION);
 590     extensions = glGetString(GL_EXTENSIONS);
 591     if (!version || !extensions) {
 592         av_log(h, AV_LOG_ERROR, "No OpenGL context initialized for the current thread\n");
 593         return AVERROR(ENOSYS);
 594     }
 595
 596     av_log(h, AV_LOG_DEBUG, "OpenGL version: %s\n", version);
 597     sscanf(version, "%d.%d", &major, &minor);
 598
 599     for (i = 0; required_extensions[i].extension; i++) {
 600         if (major < required_extensions[i].major &&
 601             (major == required_extensions[i].major && minor < required_extensions[i].minor) &&
 602             !strstr(extensions, required_extensions[i].extension)) {
 603             av_log(h, AV_LOG_ERROR, "Required extension %s is not supported.\n",
 604                    required_extensions[i].extension);
 605             av_log(h, AV_LOG_DEBUG, "Supported extensions are: %s\n", extensions);
 606             return AVERROR(ENOSYS);
 607         }
 608     }
 609     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &opengl->max_texture_size);
 610     glGetIntegerv(GL_MAX_VIEWPORT_DIMS, &opengl->max_viewport_width);
 611     opengl->non_pow_2_textures = major >= 2 || strstr(extensions, "GL_ARB_texture_non_power_of_two");
 612 #if defined(GL_ES_VERSION_2_0)
 613     opengl->unpack_subimage = !!strstr(extensions, "GL_EXT_unpack_subimage");
 614 #else
 615     opengl->unpack_subimage = 1;
 616 #endif
 617
 618     av_log(h, AV_LOG_DEBUG, "Non Power of 2 textures support: %s\n", opengl->non_pow_2_textures ? "Yes" : "No");
 619     av_log(h, AV_LOG_DEBUG, "Unpack Subimage extension support: %s\n", opengl->unpack_subimage ? "Yes" : "No");
 620     av_log(h, AV_LOG_DEBUG, "Max texture size: %dx%d\n", opengl->max_texture_size, opengl->max_texture_size);
 621     av_log(h, AV_LOG_DEBUG, "Max viewport size: %dx%d\n",
 622            opengl->max_viewport_width, opengl->max_viewport_height);
 623
 624     OPENGL_ERROR_CHECK(opengl);
 625     return 0;
 626   fail:
 627     return AVERROR_EXTERNAL;
 628 }
 629
 630 static const char* opengl_get_fragment_shader_code(enum AVPixelFormat format)
 631 {
 632     int i;
 633     for (i = 0; i < FF_ARRAY_ELEMS(opengl_format_desc); i++) {
 634         if (opengl_format_desc[i].fixel_format == format)
 635             return *opengl_format_desc[i].fragment_shader;
 636     }
 637     return NULL;
 638 }
 639
 640 static int opengl_type_size(GLenum type)
 641 {
 642     switch(type) {
 643     case GL_UNSIGNED_SHORT:
 644     case FF_GL_UNSIGNED_SHORT_1_5_5_5_REV:
 645     case GL_UNSIGNED_SHORT_5_6_5:
 646         return 2;
 647     case GL_UNSIGNED_BYTE:
 648     case FF_GL_UNSIGNED_BYTE_3_3_2:
 649     case FF_GL_UNSIGNED_BYTE_2_3_3_REV:
 650     default:
 651         break;
 652     }
 653     return 1;
 654 }
 655
 656 static av_cold void opengl_get_texture_params(OpenGLContext *opengl)
 657 {
 658     int i;
 659     for (i = 0; i < FF_ARRAY_ELEMS(opengl_format_desc); i++) {
 660         if (opengl_format_desc[i].fixel_format == opengl->pix_fmt) {
 661             opengl->format = opengl_format_desc[i].format;
 662             opengl->type = opengl_format_desc[i].type;
 663             break;
 664         }
 665     }
 666 }
 667
 668 static void opengl_compute_display_area(AVFormatContext *s)
 669 {
 670     AVRational sar, dar; /* sample and display aspect ratios */
 671     OpenGLContext *opengl = s->priv_data;
 672     AVStream *st = s->streams[0];
 673     AVCodecParameters *par = st->codecpar;
 674
 675     /* compute overlay width and height from the codec context information */
 676     sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
 677     dar = av_mul_q(sar, (AVRational){ par->width, par->height });
 678
 679     /* we suppose the screen has a 1/1 sample aspect ratio */
 680     /* fit in the window */
 681     if (av_cmp_q(dar, (AVRational){ opengl->window_width, opengl->window_height }) > 0) {
 682         /* fit in width */
 683         opengl->picture_width = opengl->window_width;
 684         opengl->picture_height = av_rescale(opengl->picture_width, dar.den, dar.num);
 685     } else {
 686         /* fit in height */
 687         opengl->picture_height = opengl->window_height;
 688         opengl->picture_width = av_rescale(opengl->picture_height, dar.num, dar.den);
 689     }
 690 }
 691
 692 static av_cold void opengl_get_texture_size(OpenGLContext *opengl, int in_width, int in_height,
 693                                             int *out_width, int *out_height)
 694 {
 695     if (opengl->non_pow_2_textures) {
 696         *out_width = in_width;
 697         *out_height = in_height;
 698     } else {
 699         int max = FFMIN(FFMAX(in_width, in_height), opengl->max_texture_size);
 700         unsigned power_of_2 = 1;
 701         while (power_of_2 < max)
 702             power_of_2 *= 2;
 703         *out_height = power_of_2;
 704         *out_width = power_of_2;
 705         av_log(opengl, AV_LOG_DEBUG, "Texture size calculated from %dx%d into %dx%d\n",
 706                in_width, in_height, *out_width, *out_height);
 707     }
 708 }
 709
 710 static av_cold void opengl_fill_color_map(OpenGLContext *opengl)
 711 {
 712     const AVPixFmtDescriptor *desc;
 713     int shift;
 714     enum AVPixelFormat pix_fmt = opengl->pix_fmt;
 715
 716     /* We need order of components, not exact position, some minor HACKs here */
 717     if (pix_fmt == AV_PIX_FMT_RGB565 || pix_fmt == AV_PIX_FMT_BGR555 ||
 718         pix_fmt == AV_PIX_FMT_BGR8   || pix_fmt == AV_PIX_FMT_RGB8)
 719         pix_fmt = AV_PIX_FMT_RGB24;
 720     else if (pix_fmt == AV_PIX_FMT_BGR565 || pix_fmt == AV_PIX_FMT_RGB555)
 721         pix_fmt = AV_PIX_FMT_BGR24;
 722
 723     desc = av_pix_fmt_desc_get(pix_fmt);
 724     if (!(desc->flags & AV_PIX_FMT_FLAG_RGB))
 725         return;
 726
 727 #define FILL_COMPONENT(i) { \
 728         shift = (desc->comp[i].depth - 1) >> 3; \
 729         opengl->color_map[(i << 2) + (desc->comp[i].offset >> shift)] = 1.0; \
 730     }
 731
 732     memset(opengl->color_map, 0, sizeof(opengl->color_map));
 733     FILL_COMPONENT(0);
 734     FILL_COMPONENT(1);
 735     FILL_COMPONENT(2);
 736     if (desc->flags & AV_PIX_FMT_FLAG_ALPHA)
 737         FILL_COMPONENT(3);
 738
 739 #undef FILL_COMPONENT
 740 }
 741
 742 static av_cold GLuint opengl_load_shader(OpenGLContext *opengl, GLenum type, const char *source)
 743 {
 744     GLuint shader = opengl->glprocs.glCreateShader(type);
 745     GLint result;
 746     if (!shader) {
 747         av_log(opengl, AV_LOG_ERROR, "glCreateShader() failed\n");
 748         return 0;
 749     }
 750     opengl->glprocs.glShaderSource(shader, 1, &source, NULL);
 751     opengl->glprocs.glCompileShader(shader);
 752
 753     opengl->glprocs.glGetShaderiv(shader, FF_GL_COMPILE_STATUS, &result);
 754     if (!result) {
 755         char *log;
 756         opengl->glprocs.glGetShaderiv(shader, FF_GL_INFO_LOG_LENGTH, &result);
 757         if (result) {
 758             if ((log = av_malloc(result))) {
 759                 opengl->glprocs.glGetShaderInfoLog(shader, result, NULL, log);
 760                 av_log(opengl, AV_LOG_ERROR, "Compile error: %s\n", log);
 761                 av_free(log);
 762             }
 763         }
 764         goto fail;
 765     }
 766     OPENGL_ERROR_CHECK(opengl);
 767     return shader;
 768   fail:
 769     opengl->glprocs.glDeleteShader(shader);
 770     return 0;
 771 }
 772
 773 static av_cold int opengl_compile_shaders(OpenGLContext *opengl, enum AVPixelFormat pix_fmt)
 774 {
 775     GLint result;
 776     const char *fragment_shader_code = opengl_get_fragment_shader_code(pix_fmt);
 777
 778     if (!fragment_shader_code) {
 779         av_log(opengl, AV_LOG_ERROR, "Provided pixel format '%s' is not supported\n",
 780                av_get_pix_fmt_name(pix_fmt));
 781         return AVERROR(EINVAL);
 782     }
 783
 784     opengl->vertex_shader = opengl_load_shader(opengl, FF_GL_VERTEX_SHADER,
 785                                                FF_OPENGL_VERTEX_SHADER);
 786     if (!opengl->vertex_shader) {
 787         av_log(opengl, AV_LOG_ERROR, "Vertex shader loading failed.\n");
 788         goto fail;
 789     }
 790     opengl->fragment_shader = opengl_load_shader(opengl, FF_GL_FRAGMENT_SHADER,
 791                                                  fragment_shader_code);
 792     if (!opengl->fragment_shader) {
 793         av_log(opengl, AV_LOG_ERROR, "Fragment shader loading failed.\n");
 794         goto fail;
 795     }
 796
 797     opengl->program = opengl->glprocs.glCreateProgram();
 798     if (!opengl->program)
 799         goto fail;
 800
 801     opengl->glprocs.glAttachShader(opengl->program, opengl->vertex_shader);
 802     opengl->glprocs.glAttachShader(opengl->program, opengl->fragment_shader);
 803     opengl->glprocs.glLinkProgram(opengl->program);
 804
 805     opengl->glprocs.glGetProgramiv(opengl->program, FF_GL_LINK_STATUS, &result);
 806     if (!result) {
 807         char *log;
 808         opengl->glprocs.glGetProgramiv(opengl->program, FF_GL_INFO_LOG_LENGTH, &result);
 809         if (result) {
 810             log = av_malloc(result);
 811             if (!log)
 812                 goto fail;
 813             opengl->glprocs.glGetProgramInfoLog(opengl->program, result, NULL, log);
 814             av_log(opengl, AV_LOG_ERROR, "Link error: %s\n", log);
 815             av_free(log);
 816         }
 817         goto fail;
 818     }
 819
 820     opengl->position_attrib = opengl->glprocs.glGetAttribLocation(opengl->program, "a_position");
 821     opengl->texture_coords_attrib = opengl->glprocs.glGetAttribLocation(opengl->program, "a_textureCoords");
 822     opengl->projection_matrix_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_projectionMatrix");
 823     opengl->model_view_matrix_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_modelViewMatrix");
 824     opengl->color_map_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_colorMap");
 825     opengl->texture_location[0] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture0");
 826     opengl->texture_location[1] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture1");
 827     opengl->texture_location[2] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture2");
 828     opengl->texture_location[3] = opengl->glprocs.glGetUniformLocation(opengl->program, "u_texture3");
 829     opengl->chroma_div_w_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_chroma_div_w");
 830     opengl->chroma_div_h_location = opengl->glprocs.glGetUniformLocation(opengl->program, "u_chroma_div_h");
 831
 832     OPENGL_ERROR_CHECK(opengl);
 833     return 0;
 834   fail:
 835     opengl->glprocs.glDeleteShader(opengl->vertex_shader);
 836     opengl->glprocs.glDeleteShader(opengl->fragment_shader);
 837     opengl->glprocs.glDeleteProgram(opengl->program);
 838     opengl->fragment_shader = opengl->vertex_shader = opengl->program = 0;
 839     return AVERROR_EXTERNAL;
 840 }
 841
 842 static av_cold int opengl_configure_texture(OpenGLContext *opengl, GLuint texture,
 843                                             GLsizei width, GLsizei height)
 844 {
 845     if (texture) {
 846         int new_width, new_height;
 847         opengl_get_texture_size(opengl, width, height, &new_width, &new_height);
 848         glBindTexture(GL_TEXTURE_2D, texture);
 849         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 850         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 851         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 852         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 853         glTexImage2D(GL_TEXTURE_2D, 0, opengl->format, new_width, new_height, 0,
 854                      opengl->format, opengl->type, NULL);
 855         OPENGL_ERROR_CHECK(NULL);
 856     }
 857     return 0;
 858   fail:
 859     return AVERROR_EXTERNAL;
 860 }
 861
 862 static av_cold int opengl_prepare_vertex(AVFormatContext *s)
 863 {
 864     OpenGLContext *opengl = s->priv_data;
 865     int tex_w, tex_h;
 866
 867     if (opengl->window_width > opengl->max_viewport_width || opengl->window_height > opengl->max_viewport_height) {
 868         opengl->window_width = FFMIN(opengl->window_width, opengl->max_viewport_width);
 869         opengl->window_height = FFMIN(opengl->window_height, opengl->max_viewport_height);
 870         av_log(opengl, AV_LOG_WARNING, "Too big viewport requested, limited to %dx%d", opengl->window_width, opengl->window_height);
 871     }
 872     glViewport(0, 0, opengl->window_width, opengl->window_height);
 873     opengl_make_ortho(opengl->projection_matrix,
 874                       - (float)opengl->window_width  / 2.0f, (float)opengl->window_width  / 2.0f,
 875                       - (float)opengl->window_height / 2.0f, (float)opengl->window_height / 2.0f,
 876                       1.0f, -1.0f);
 877     opengl_make_identity(opengl->model_view_matrix);
 878
 879     opengl_compute_display_area(s);
 880
 881     opengl->vertex[0].z = opengl->vertex[1].z = opengl->vertex[2].z = opengl->vertex[3].z = 0.0f;
 882     opengl->vertex[0].x = opengl->vertex[1].x = - (float)opengl->picture_width / 2.0f;
 883     opengl->vertex[2].x = opengl->vertex[3].x =   (float)opengl->picture_width / 2.0f;
 884     opengl->vertex[1].y = opengl->vertex[2].y = - (float)opengl->picture_height / 2.0f;
 885     opengl->vertex[0].y = opengl->vertex[3].y =   (float)opengl->picture_height / 2.0f;
 886
 887     opengl_get_texture_size(opengl, opengl->width, opengl->height, &tex_w, &tex_h);
 888
 889     opengl->vertex[0].s0 = 0.0f;
 890     opengl->vertex[0].t0 = 0.0f;
 891     opengl->vertex[1].s0 = 0.0f;
 892     opengl->vertex[1].t0 = (float)opengl->height / (float)tex_h;
 893     opengl->vertex[2].s0 = (float)opengl->width  / (float)tex_w;
 894     opengl->vertex[2].t0 = (float)opengl->height / (float)tex_h;
 895     opengl->vertex[3].s0 = (float)opengl->width  / (float)tex_w;
 896     opengl->vertex[3].t0 = 0.0f;
 897
 898     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);
 899     opengl->glprocs.glBufferData(FF_GL_ARRAY_BUFFER, sizeof(opengl->vertex), opengl->vertex, FF_GL_STATIC_DRAW);
 900     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, 0);
 901     OPENGL_ERROR_CHECK(opengl);
 902     return 0;
 903   fail:
 904     return AVERROR_EXTERNAL;
 905 }
 906
 907 static int opengl_prepare(OpenGLContext *opengl)
 908 {
 909     int i;
 910     opengl->glprocs.glUseProgram(opengl->program);
 911     opengl->glprocs.glUniformMatrix4fv(opengl->projection_matrix_location, 1, GL_FALSE, opengl->projection_matrix);
 912     opengl->glprocs.glUniformMatrix4fv(opengl->model_view_matrix_location, 1, GL_FALSE, opengl->model_view_matrix);
 913     for (i = 0; i < 4; i++)
 914         if (opengl->texture_location[i] != -1) {
 915             opengl->glprocs.glActiveTexture(GL_TEXTURE0 + i);
 916             glBindTexture(GL_TEXTURE_2D, opengl->texture_name[i]);
 917             opengl->glprocs.glUniform1i(opengl->texture_location[i], i);
 918         }
 919     if (opengl->color_map_location != -1)
 920         opengl->glprocs.glUniformMatrix4fv(opengl->color_map_location, 1, GL_FALSE, opengl->color_map);
 921     if (opengl->chroma_div_h_location != -1)
 922         opengl->glprocs.glUniform1f(opengl->chroma_div_h_location, opengl->chroma_div_h);
 923     if (opengl->chroma_div_w_location != -1)
 924         opengl->glprocs.glUniform1f(opengl->chroma_div_w_location, opengl->chroma_div_w);
 925
 926     OPENGL_ERROR_CHECK(opengl);
 927     return 0;
 928   fail:
 929     return AVERROR_EXTERNAL;
 930 }
 931
 932 static int opengl_create_window(AVFormatContext *h)
 933 {
 934     OpenGLContext *opengl = h->priv_data;
 935     int ret;
 936
 937     if (!opengl->no_window) {
 938 #if CONFIG_SDL2
 939         if ((ret = opengl_sdl_create_window(h)) < 0) {
 940             av_log(opengl, AV_LOG_ERROR, "Cannot create default SDL window.\n");
 941             return ret;
 942         }
 943 #else
 944         av_log(opengl, AV_LOG_ERROR, "FFmpeg is compiled without SDL. Cannot create default window.\n");
 945         return AVERROR(ENOSYS);
 946 #endif
 947     } else {
 948         AVDeviceRect message;
 949         message.x = message.y = 0;
 950         message.width = opengl->window_width;
 951         message.height = opengl->window_height;
 952         if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_CREATE_WINDOW_BUFFER,
 953                                                        &message , sizeof(message))) < 0) {
 954             av_log(opengl, AV_LOG_ERROR, "Application failed to create window buffer.\n");
 955             return ret;
 956         }
 957         if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {
 958             av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
 959             return ret;
 960         }
 961     }
 962     return 0;
 963 }
 964
 965 static int opengl_release_window(AVFormatContext *h)
 966 {
 967     int ret;
 968     OpenGLContext *opengl = h->priv_data;
 969     if (!opengl->no_window) {
 970 #if CONFIG_SDL2
 971         SDL_GL_DeleteContext(opengl->glcontext);
 972         SDL_DestroyWindow(opengl->window);
 973         SDL_Quit();
 974 #endif
 975     } else if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER, NULL , 0)) < 0) {
 976         av_log(opengl, AV_LOG_ERROR, "Application failed to release window buffer.\n");
 977         return ret;
 978     }
 979     return 0;
 980 }
 981
 982 static av_cold int opengl_write_trailer(AVFormatContext *h)
 983 {
 984     OpenGLContext *opengl = h->priv_data;
 985
 986     if (opengl->no_window &&
 987         avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0) < 0)
 988         av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
 989
 990     opengl_deinit_context(opengl);
 991     opengl_release_window(h);
 992
 993     return 0;
 994 }
 995
 996 static av_cold int opengl_init_context(OpenGLContext *opengl)
 997 {
 998     int i, ret;
 999     const AVPixFmtDescriptor *desc;
1000
1001     if ((ret = opengl_compile_shaders(opengl, opengl->pix_fmt)) < 0)
1002         goto fail;
1003
1004     desc = av_pix_fmt_desc_get(opengl->pix_fmt);
1005     av_assert0(desc->nb_components > 0 && desc->nb_components <= 4);
1006     glGenTextures(desc->nb_components, opengl->texture_name);
1007
1008     opengl->glprocs.glGenBuffers(2, &opengl->index_buffer);
1009     if (!opengl->index_buffer || !opengl->vertex_buffer) {
1010         av_log(opengl, AV_LOG_ERROR, "Buffer generation failed.\n");
1011         ret = AVERROR_EXTERNAL;
1012         goto fail;
1013     }
1014
1015     opengl_configure_texture(opengl, opengl->texture_name[0], opengl->width, opengl->height);
1016     if (desc->nb_components > 1) {
1017         int has_alpha = desc->flags & AV_PIX_FMT_FLAG_ALPHA;
1018         int num_planes = desc->nb_components - (has_alpha ? 1 : 0);
1019         if (opengl->non_pow_2_textures) {
1020             opengl->chroma_div_w = 1.0f;
1021             opengl->chroma_div_h = 1.0f;
1022         } else {
1023             opengl->chroma_div_w = 1 << desc->log2_chroma_w;
1024             opengl->chroma_div_h = 1 << desc->log2_chroma_h;
1025         }
1026         for (i = 1; i < num_planes; i++)
1027             if (opengl->non_pow_2_textures)
1028                 opengl_configure_texture(opengl, opengl->texture_name[i],
1029                         AV_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w),
1030                         AV_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h));
1031             else
1032                 opengl_configure_texture(opengl, opengl->texture_name[i], opengl->width, opengl->height);
1033         if (has_alpha)
1034             opengl_configure_texture(opengl, opengl->texture_name[3], opengl->width, opengl->height);
1035     }
1036
1037     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);
1038     opengl->glprocs.glBufferData(FF_GL_ELEMENT_ARRAY_BUFFER, sizeof(g_index), g_index, FF_GL_STATIC_DRAW);
1039     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, 0);
1040
1041     glEnable(GL_BLEND);
1042     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1043
1044     glClearColor((float)opengl->background[0] / 255.0f, (float)opengl->background[1] / 255.0f,
1045                  (float)opengl->background[2] / 255.0f, 1.0f);
1046
1047     ret = AVERROR_EXTERNAL;
1048     OPENGL_ERROR_CHECK(opengl);
1049
1050     return 0;
1051   fail:
1052     return ret;
1053 }
1054
1055 static av_cold int opengl_write_header(AVFormatContext *h)
1056 {
1057     OpenGLContext *opengl = h->priv_data;
1058     AVCodecParameters *par = h->streams[0]->codecpar;
1059     AVStream *st;
1060     int ret;
1061
1062     if (h->nb_streams != 1 ||
1063         par->codec_type != AVMEDIA_TYPE_VIDEO ||
1064         (par->codec_id != AV_CODEC_ID_WRAPPED_AVFRAME && par->codec_id != AV_CODEC_ID_RAWVIDEO)) {
1065         av_log(opengl, AV_LOG_ERROR, "Only a single raw or wrapped avframe video stream is supported.\n");
1066         return AVERROR(EINVAL);
1067     }
1068     st = h->streams[0];
1069     opengl->width = st->codecpar->width;
1070     opengl->height = st->codecpar->height;
1071     opengl->pix_fmt = st->codecpar->format;
1072     if (!opengl->window_width)
1073         opengl->window_width = opengl->width;
1074     if (!opengl->window_height)
1075         opengl->window_height = opengl->height;
1076
1077     if (!opengl->window_title && !opengl->no_window)
1078         opengl->window_title = av_strdup(h->url);
1079
1080     if ((ret = opengl_create_window(h)))
1081         goto fail;
1082
1083     if ((ret = opengl_read_limits(h)) < 0)
1084         goto fail;
1085
1086     if (opengl->width > opengl->max_texture_size || opengl->height > opengl->max_texture_size) {
1087         av_log(opengl, AV_LOG_ERROR, "Too big picture %dx%d, max supported size is %dx%d\n",
1088                opengl->width, opengl->height, opengl->max_texture_size, opengl->max_texture_size);
1089         ret = AVERROR(EINVAL);
1090         goto fail;
1091     }
1092
1093     if ((ret = opengl_load_procedures(opengl)) < 0)
1094         goto fail;
1095
1096     opengl_fill_color_map(opengl);
1097     opengl_get_texture_params(opengl);
1098
1099     if ((ret = opengl_init_context(opengl)) < 0)
1100         goto fail;
1101
1102     if ((ret = opengl_prepare_vertex(h)) < 0)
1103         goto fail;
1104
1105     glClear(GL_COLOR_BUFFER_BIT);
1106
1107 #if CONFIG_SDL2
1108     if (!opengl->no_window)
1109         SDL_GL_SwapWindow(opengl->window);
1110 #endif
1111     if (opengl->no_window &&
1112         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {
1113         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");
1114         goto fail;
1115     }
1116
1117     ret = AVERROR_EXTERNAL;
1118     OPENGL_ERROR_CHECK(opengl);
1119
1120     opengl->inited = 1;
1121     return 0;
1122
1123   fail:
1124     opengl_write_trailer(h);
1125     return ret;
1126 }
1127
1128 static uint8_t* opengl_get_plane_pointer(OpenGLContext *opengl, AVPacket *pkt, int comp_index,
1129                                          const AVPixFmtDescriptor *desc)
1130 {
1131     uint8_t *data = pkt->data;
1132     int wordsize = opengl_type_size(opengl->type);
1133     int width_chroma = AV_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w);
1134     int height_chroma = AV_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h);
1135     int plane = desc->comp[comp_index].plane;
1136
1137     switch(plane) {
1138     case 0:
1139         break;
1140     case 1:
1141         data += opengl->width * opengl->height * wordsize;
1142         break;
1143     case 2:
1144         data += opengl->width * opengl->height * wordsize;
1145         data += width_chroma * height_chroma * wordsize;
1146         break;
1147     case 3:
1148         data += opengl->width * opengl->height * wordsize;
1149         data += 2 * width_chroma * height_chroma * wordsize;
1150         break;
1151     default:
1152         return NULL;
1153     }
1154     return data;
1155 }
1156
1157 #define LOAD_TEXTURE_DATA(comp_index, sub)                                                  \
1158 {                                                                                           \
1159     int width = sub ? AV_CEIL_RSHIFT(opengl->width, desc->log2_chroma_w) : opengl->width;   \
1160     int height = sub ? AV_CEIL_RSHIFT(opengl->height, desc->log2_chroma_h): opengl->height; \
1161     uint8_t *data;                                                                          \
1162     int plane = desc->comp[comp_index].plane;                                               \
1163                                                                                             \
1164     glBindTexture(GL_TEXTURE_2D, opengl->texture_name[comp_index]);                         \
1165     if (!is_pkt) {                                                                          \
1166         GLint length = ((AVFrame *)input)->linesize[plane];                                 \
1167         int bytes_per_pixel = opengl_type_size(opengl->type);                               \
1168         if (!(desc->flags & AV_PIX_FMT_FLAG_PLANAR))                                        \
1169             bytes_per_pixel *= desc->nb_components;                                         \
1170         data = ((AVFrame *)input)->data[plane];                                             \
1171         if (!(length % bytes_per_pixel) &&                                                  \
1172             (opengl->unpack_subimage || ((length / bytes_per_pixel) == width))) {           \
1173             length /= bytes_per_pixel;                                                      \
1174             if (length != width)                                                            \
1175                 glPixelStorei(FF_GL_UNPACK_ROW_LENGTH, length);                             \
1176             glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,                          \
1177                             opengl->format, opengl->type, data);                            \
1178             if (length != width)                                                            \
1179                 glPixelStorei(FF_GL_UNPACK_ROW_LENGTH, 0);                                  \
1180         } else {                                                                            \
1181             int h;                                                                          \
1182             for (h = 0; h < height; h++) {                                                  \
1183                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, h, width, 1,                           \
1184                                 opengl->format, opengl->type, data);                        \
1185                 data += length;                                                             \
1186             }                                                                               \
1187         }                                                                                   \
1188     } else {                                                                                \
1189         data = opengl_get_plane_pointer(opengl, input, comp_index, desc);                   \
1190         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,                              \
1191                         opengl->format, opengl->type, data);                                \
1192     }                                                                                       \
1193 }
1194
1195 static int opengl_draw(AVFormatContext *h, void *input, int repaint, int is_pkt)
1196 {
1197     OpenGLContext *opengl = h->priv_data;
1198     enum AVPixelFormat pix_fmt = h->streams[0]->codecpar->format;
1199     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
1200     int ret;
1201
1202 #if CONFIG_SDL2
1203     if (!opengl->no_window && (ret = opengl_sdl_process_events(h)) < 0)
1204         goto fail;
1205 #endif
1206     if (opengl->no_window &&
1207         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {
1208         av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
1209         goto fail;
1210     }
1211
1212     glClear(GL_COLOR_BUFFER_BIT);
1213
1214     if (!repaint) {
1215         if (is_pkt)
1216             glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
1217         LOAD_TEXTURE_DATA(0, 0)
1218         if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {
1219             LOAD_TEXTURE_DATA(1, 1)
1220             LOAD_TEXTURE_DATA(2, 1)
1221             if (desc->flags & AV_PIX_FMT_FLAG_ALPHA)
1222                 LOAD_TEXTURE_DATA(3, 0)
1223         }
1224     }
1225     ret = AVERROR_EXTERNAL;
1226     OPENGL_ERROR_CHECK(opengl);
1227
1228     if ((ret = opengl_prepare(opengl)) < 0)
1229         goto fail;
1230
1231     opengl->glprocs.glBindBuffer(FF_GL_ARRAY_BUFFER, opengl->vertex_buffer);
1232     opengl->glprocs.glBindBuffer(FF_GL_ELEMENT_ARRAY_BUFFER, opengl->index_buffer);
1233     opengl->glprocs.glVertexAttribPointer(opengl->position_attrib, 3, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 0);
1234     opengl->glprocs.glEnableVertexAttribArray(opengl->position_attrib);
1235     opengl->glprocs.glVertexAttribPointer(opengl->texture_coords_attrib, 2, GL_FLOAT, GL_FALSE, sizeof(OpenGLVertexInfo), 12);
1236     opengl->glprocs.glEnableVertexAttribArray(opengl->texture_coords_attrib);
1237
1238     glDrawElements(GL_TRIANGLES, FF_ARRAY_ELEMS(g_index), GL_UNSIGNED_SHORT, 0);
1239
1240     ret = AVERROR_EXTERNAL;
1241     OPENGL_ERROR_CHECK(opengl);
1242
1243 #if CONFIG_SDL2
1244     if (!opengl->no_window)
1245         SDL_GL_SwapWindow(opengl->window);
1246 #endif
1247     if (opengl->no_window &&
1248         (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER, NULL , 0)) < 0) {
1249         av_log(opengl, AV_LOG_ERROR, "Application failed to display window buffer.\n");
1250         goto fail;
1251     }
1252
1253     return 0;
1254   fail:
1255     return ret;
1256 }
1257
1258 static int opengl_write_packet(AVFormatContext *h, AVPacket *pkt)
1259 {
1260     AVCodecParameters *par = h->streams[0]->codecpar;
1261     if (par->codec_id == AV_CODEC_ID_WRAPPED_AVFRAME) {
1262         AVFrame *frame = (AVFrame *)pkt->data;
1263         return opengl_draw(h, frame, 0, 0);
1264     } else {
1265         return opengl_draw(h, pkt, 0, 1);
1266     }
1267 }
1268
1269 static int opengl_write_frame(AVFormatContext *h, int stream_index,
1270                               AVFrame **frame, unsigned flags)
1271 {
1272     if ((flags & AV_WRITE_UNCODED_FRAME_QUERY))
1273         return 0;
1274     return opengl_draw(h, *frame, 0, 0);
1275 }
1276
1277 #define OFFSET(x) offsetof(OpenGLContext, x)
1278 #define ENC AV_OPT_FLAG_ENCODING_PARAM
1279 static const AVOption options[] = {
1280     { "background",   "set background color",   OFFSET(background),   AV_OPT_TYPE_COLOR,  {.str = "black"}, 0, 0, ENC },
1281     { "no_window",    "disable default window", OFFSET(no_window),    AV_OPT_TYPE_INT,    {.i64 = 0}, INT_MIN, INT_MAX, ENC },
1282     { "window_title", "set window title",       OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, ENC },
1283     { "window_size",  "set window size",        OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, ENC },
1284     { NULL }
1285 };
1286
1287 static const AVClass opengl_class = {
1288     .class_name = "opengl outdev",
1289     .item_name  = av_default_item_name,
1290     .option     = options,
1291     .version    = LIBAVUTIL_VERSION_INT,
1292     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
1293 };
1294
1295 const AVOutputFormat ff_opengl_muxer = {
1296     .name           = "opengl",
1297     .long_name      = NULL_IF_CONFIG_SMALL("OpenGL output"),
1298     .priv_data_size = sizeof(OpenGLContext),
1299     .audio_codec    = AV_CODEC_ID_NONE,
1300     .video_codec    = AV_CODEC_ID_WRAPPED_AVFRAME,
1301     .write_header   = opengl_write_header,
1302     .write_packet   = opengl_write_packet,
1303     .write_uncoded_frame = opengl_write_frame,
1304     .write_trailer  = opengl_write_trailer,
1305     .control_message = opengl_control_message,
1306     .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
1307     .priv_class     = &opengl_class,
1308 };