lavd: add opengl device

It can render to OpenGL context provided by application or into SDL window

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>

Changelog

@@ -21,6 +21,7 @@ version <next>
 - framepack filter
 - XYZ12 rawvideo support in NUT
 - Exif metadata support in WebP decoder
+- OpenGL device
 
 
 version 2.1:

configure

@@ -251,6 +251,7 @@ External library support:
   --enable-libzvbi         enable teletext support via libzvbi [no]
   --enable-openal          enable OpenAL 1.1 capture support [no]
   --enable-opencl          enable OpenCL code
+  --enable-opengl          enable OpenGL rendering [no]
   --enable-openssl         enable openssl [no]
   --enable-x11grab         enable X11 grabbing [no]
   --disable-zlib           disable zlib [autodetect]
@@ -1311,6 +1312,7 @@ EXTERNAL_LIBRARY_LIST="
     libzvbi
     openal
     opencl
+    opengl
     openssl
     x11grab
     zlib
@@ -1554,6 +1556,7 @@ HAVE_LIST="
     dxva_h
     ebp_available
     ebx_available
+    ES2_gl_h
     fast_64bit
     fast_clz
     fast_cmov
@@ -1570,6 +1573,7 @@ HAVE_LIST="
     getservbyport
     gettimeofday
     glob
+    glXGetProcAddress
     gnu_as
     gnu_windres
     gsm_h
@@ -1603,6 +1607,7 @@ HAVE_LIST="
     mprotect
     nanosleep
     openjpeg_1_5_openjpeg_h
+    OpenGL_gl3_h
     PeekNamedPipe
     perl
     pod2man
@@ -1656,6 +1661,7 @@ HAVE_LIST="
     vdpau_x11
     vfp_args
     VirtualAlloc
+    wglGetProcAddress
     windows_h
     winsock2_h
     xform_asm
@@ -2262,6 +2268,7 @@ libcdio_indev_deps="libcdio"
 libdc1394_indev_deps="libdc1394"
 libv4l2_indev_deps="libv4l2"
 openal_indev_deps="openal"
+opengl_outdev_deps="opengl"
 oss_indev_deps_any="soundcard_h sys_soundcard_h"
 oss_outdev_deps_any="soundcard_h sys_soundcard_h"
 pulse_indev_deps="libpulse"
@@ -4498,6 +4505,12 @@ enabled opencl            && { check_lib2 OpenCL/cl.h clEnqueueNDRangeKernel -Wl
                              { check_cpp_condition "OpenCL/cl.h" "defined(CL_VERSION_1_2)" ||
                                check_cpp_condition "CL/cl.h" "defined(CL_VERSION_1_2)" ||
                                die "ERROR: opencl must be installed and version must be 1.2 or compatible"; }
+enabled opengl            && { check_lib GL/glx.h glXGetProcAddress "-lGL" ||
+                               check_lib2 windows.h wglGetProcAddress "-lopengl32 -lgdi32" ||
+                               check_lib2 OpenGL/gl3.h glGetError "-Wl,-framework,OpenGL" ||
+                               check_lib2 ES2/gl.h glGetError "-isysroot=${sysroot} -Wl,-framework,OpenGLES" ||
+                               die "ERROR: opengl not found."
+                             }
 enabled openssl           && { check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto ||
                                check_lib openssl/ssl.h SSL_library_init -lssl32 -leay32 ||
                                check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto -lws2_32 -lgdi32 ||

doc/outdevs.texi

@@ -149,6 +149,41 @@ ffmpeg -re -i INPUT -vcodec rawvideo -pix_fmt bgra -f fbdev /dev/fb0
 
 See also @url{http://linux-fbdev.sourceforge.net/}, and fbset(1).
 
+@section opengl
+OpenGL output device.
+
+To enable this output device you need to configure FFmpeg with @code{--enable-opengl}.
+
+Device allows to render to OpenGL context.
+Context may be provided by application or default SDL window is created.
+
+When device renders to external context, application must implement handlers for following messages:
+@code{AV_CTL_MESSAGE_CREATE_WINDOW_BUFFER} - create OpenGL context on current thread.
+@code{AV_CTL_MESSAGE_PREPARE_WINDOW_BUFFER} - make OpenGL context current.
+@code{AV_CTL_MESSAGE_DISPLAY_WINDOW_BUFFER} - swap buffers.
+@code{AV_CTL_MESSAGE_DESTROY_WINDOW_BUFFER} - destroy OpenGL context.
+Application is also required to inform a device about current resolution by sending @code{AV_DEVICE_WINDOW_RESIZED} message.
+
+@subsection Options
+@table @option
+
+@item background
+Set background color. Black is a default.
+@item no_window
+Disables default SDL window when set to non-zero value.
+Application must provide OpenGL context and both @code{window_size_cb} and @code{window_swap_buffers_cb} callbacks when set.
+@item window_title
+Set the SDL window title, if not specified default to the filename specified for the output device.
+Ignored when @option{no_window} is set.
+
+@end table
+
+@subsection Examples
+Play a file on SDL window using OpenGL rendering:
+@example
+ffmpeg  -i INPUT -f opengl "window title"
+@end example
+
 @section oss
 
 OSS (Open Sound System) output device.

libavdevice/Makefile

@@ -29,6 +29,7 @@ OBJS-$(CONFIG_IEC61883_INDEV)            += iec61883.o
 OBJS-$(CONFIG_JACK_INDEV)                += jack_audio.o timefilter.o
 OBJS-$(CONFIG_LAVFI_INDEV)               += lavfi.o
 OBJS-$(CONFIG_OPENAL_INDEV)              += openal-dec.o
+OBJS-$(CONFIG_OPENGL_OUTDEV)             += opengl_enc.o
 OBJS-$(CONFIG_OSS_INDEV)                 += oss_audio.o
 OBJS-$(CONFIG_OSS_OUTDEV)                += oss_audio.o
 OBJS-$(CONFIG_PULSE_INDEV)               += pulse_audio_dec.o \

libavdevice/alldevices.c

@@ -56,6 +56,7 @@ void avdevice_register_all(void)
     REGISTER_INDEV   (JACK,             jack);
     REGISTER_INDEV   (LAVFI,            lavfi);
     REGISTER_INDEV   (OPENAL,           openal);
+    REGISTER_OUTDEV  (OPENGL,           opengl);
     REGISTER_INOUTDEV(OSS,              oss);
     REGISTER_INOUTDEV(PULSE,            pulse);
     REGISTER_OUTDEV  (SDL,              sdl);

libavdevice/opengl_enc_shaders.h

@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2014 Lukasz Marek
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVDEVICE_OPENGL_SHADERS_H
+#define AVDEVICE_OPENGL_SHADERS_H
+
+#include "libavutil/pixfmt.h"
+
+const char *FF_OPENGL_VERTEX_SHADER =
+    "uniform mat4 u_projectionMatrix;"
+    "uniform mat4 u_modelViewMatrix;"
+
+    "attribute vec4 a_position;"
+    "attribute vec2 a_textureCoords;"
+
+    "varying vec2 texture_coordinate;"
+
+    "void main()"
+    "{"
+        "gl_Position = u_projectionMatrix * (a_position * u_modelViewMatrix);"
+        "texture_coordinate = a_textureCoords;"
+    "}";
+
+/**
+ * Fragment shader for packet RGBA formats.
+ */
+const char *FF_OPENGL_FRAGMENT_SHADER_RGBA_PACKET =
+#if defined(GL_ES_VERSION_2_0)
+    "precision mediump float;"
+#endif
+    "uniform sampler2D u_texture0;"
+    "uniform mat4 u_colorMap;"
+
+    "varying vec2 texture_coordinate;"
+
+    "void main()"
+    "{"
+        "gl_FragColor = texture2D(u_texture0, texture_coordinate) * u_colorMap;"
+    "}";
+
+/**
+ * Fragment shader for packet RGB formats.
+ */
+const char *FF_OPENGL_FRAGMENT_SHADER_RGB_PACKET =
+#if defined(GL_ES_VERSION_2_0)
+    "precision mediump float;"
+#endif
+    "uniform sampler2D u_texture0;"
+    "uniform mat4 u_colorMap;"
+
+    "varying vec2 texture_coordinate;"
+
+    "void main()"
+    "{"
+        "gl_FragColor = vec4((texture2D(u_texture0, texture_coordinate) * u_colorMap).rgb, 1.0);"
+    "}";
+
+/**
+ * Fragment shader for planar RGBA formats.
+ */
+const char *FF_OPENGL_FRAGMENT_SHADER_RGBA_PLANAR =
+#if defined(GL_ES_VERSION_2_0)
+    "precision mediump float;"
+#endif
+    "uniform sampler2D u_texture0;"
+    "uniform sampler2D u_texture1;"
+    "uniform sampler2D u_texture2;"
+    "uniform sampler2D u_texture3;"
+
+    "varying vec2 texture_coordinate;"
+
+    "void main()"
+    "{"
+        "gl_FragColor = vec4(texture2D(u_texture0, texture_coordinate).r,"
+                            "texture2D(u_texture1, texture_coordinate).r,"
+                            "texture2D(u_texture2, texture_coordinate).r,"
+                            "texture2D(u_texture3, texture_coordinate).r);"
+    "}";
+
+/**
+ * Fragment shader for planar RGB formats.
+ */
+const char *FF_OPENGL_FRAGMENT_SHADER_RGB_PLANAR =
+#if defined(GL_ES_VERSION_2_0)
+    "precision mediump float;"
+#endif
+    "uniform sampler2D u_texture0;"
+    "uniform sampler2D u_texture1;"
+    "uniform sampler2D u_texture2;"
+
+    "varying vec2 texture_coordinate;"
+
+    "void main()"
+    "{"
+        "gl_FragColor = vec4(texture2D(u_texture0, texture_coordinate).r,"
+                            "texture2D(u_texture1, texture_coordinate).r,"
+                            "texture2D(u_texture2, texture_coordinate).r,"
+                            "1.0);"
+    "}";
+
+/**
+ * Fragment shader for planar YUV formats.
+ */
+const char *FF_OPENGL_FRAGMENT_SHADER_YUV_PLANAR =
+#if defined(GL_ES_VERSION_2_0)
+    "precision mediump float;"
+#endif
+    "uniform sampler2D u_texture0;"
+    "uniform sampler2D u_texture1;"
+    "uniform sampler2D u_texture2;"
+    "uniform float u_chroma_div_w;"
+    "uniform float u_chroma_div_h;"
+
+    "varying vec2 texture_coordinate;"
+
+    "void main()"
+    "{"
+        "vec3 yuv;"
+
+        "yuv.r = texture2D(u_texture0, texture_coordinate).r - 0.0625;"
+        "yuv.g = texture2D(u_texture1, vec2(texture_coordinate.x / u_chroma_div_w, texture_coordinate.y / u_chroma_div_h)).r - 0.5;"
+        "yuv.b = texture2D(u_texture2, vec2(texture_coordinate.x / u_chroma_div_w, texture_coordinate.y / u_chroma_div_h)).r - 0.5;"
+
+        "gl_FragColor = clamp(vec4(mat3(1.1643,  1.16430, 1.1643,"
+                                       "0.0,    -0.39173, 2.0170,"
+                                       "1.5958, -0.81290, 0.0) * yuv, 1.0), 0.0, 1.0);"
+
+    "}";
+
+/**
+ * Fragment shader for planar YUVA formats.
+ */
+const char *FF_OPENGL_FRAGMENT_SHADER_YUVA_PLANAR =
+#if defined(GL_ES_VERSION_2_0)
+    "precision mediump float;"
+#endif
+    "uniform sampler2D u_texture0;"
+    "uniform sampler2D u_texture1;"
+    "uniform sampler2D u_texture2;"
+    "uniform sampler2D u_texture3;"
+    "uniform float u_chroma_div_w;"
+    "uniform float u_chroma_div_h;"
+
+    "varying vec2 texture_coordinate;"
+
+    "void main()"
+    "{"
+        "vec3 yuv;"
+
+        "yuv.r = texture2D(u_texture0, texture_coordinate).r - 0.0625;"
+        "yuv.g = texture2D(u_texture1, vec2(texture_coordinate.x / u_chroma_div_w, texture_coordinate.y / u_chroma_div_h)).r - 0.5;"
+        "yuv.b = texture2D(u_texture2, vec2(texture_coordinate.x / u_chroma_div_w, texture_coordinate.y / u_chroma_div_h)).r - 0.5;"
+
+        "gl_FragColor = clamp(vec4(mat3(1.1643,  1.16430, 1.1643,"
+                                       "0.0,    -0.39173, 2.0170,"
+                                       "1.5958, -0.81290, 0.0) * yuv, texture2D(u_texture3, texture_coordinate).r), 0.0, 1.0);"
+    "}";
+
+#endif /* AVDEVICE_OPENGL_SHADERS_H */