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 <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 };