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Médias (1)
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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (21)
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MediaSPIP Core : La Configuration
9 novembre 2010, parMediaSPIP Core fournit par défaut trois pages différentes de configuration (ces pages utilisent le plugin de configuration CFG pour fonctionner) : une page spécifique à la configuration générale du squelettes ; une page spécifique à la configuration de la page d’accueil du site ; une page spécifique à la configuration des secteurs ;
Il fournit également une page supplémentaire qui n’apparait que lorsque certains plugins sont activés permettant de contrôler l’affichage et les fonctionnalités spécifiques (...) -
Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users. -
Emballe médias : à quoi cela sert ?
4 février 2011, parCe plugin vise à gérer des sites de mise en ligne de documents de tous types.
Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;
Sur d’autres sites (2866)
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YUV decoded by FFMPEG that draw with opengl is not clear
3 juin 2016, par S.JinI’m writing a movie player that use FFMPEG and OpenGL ES. Movie can be decoded succeessfully, but when I use AVFrame as texture to draw in my screen, I found it was so fuzzy. I don’t know where wrong in my code. If I change the AVFrame from YUV to RGB image, it will be clear.
Does any one know why use YUV as texture to draw will be not clear ?My render code :
#import "SJGLView.h"
#import <glkit></glkit>GLKit.h>
#import "SJDecoder.h"
#include "libavutil/pixfmt.h"
// MARK: - C Function
static void sj_logShaderError(GLuint shader) {
GLint info_len = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &info_len);
if (info_len == 0) NSLog(@"Empty info");
else {
GLchar *log = (GLchar *)malloc(info_len);
glGetShaderInfoLog(shader, info_len, &info_len, log);
NSLog(@"Shader compile log: %s", log);
}
}
static void sj_logProgramError(GLuint program) {
int info_length;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &info_length);
if (info_length) {
GLchar *log = (GLchar *)malloc(info_length);
glGetProgramInfoLog(program, info_length, &info_length, log);
NSLog(@"Program link log: %s", log);
}
}
GLuint sj_loadShader(GLenum shader_type, const char* shader_source) {
GLuint shader = glCreateShader(shader_type);
glShaderSource(shader, 1, &shader_source, NULL);
glCompileShader(shader);
GLint compile_status = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compile_status);
if (!compile_status) goto fail;
return shader;
fail:
if (shader) {
sj_logShaderError(shader);
glDeleteShader(shader);
}
return 0;
}
void loadOrtho(float *matrix, float left, float right, float bottom, float top, float near, float far) {
float r_l = right - left;
float t_b = top - bottom;
float f_n = far - near;
float tx = (right + left)/(right - left);
float ty = (top + bottom)/(top - bottom);
float tz = (far + near)/(far - near);
matrix[0] = 2.0f / r_l;
matrix[1] = 0.0f;
matrix[2] = 0.0f;
matrix[3] = 0.0f;
matrix[4] = 0.0f;
matrix[5] = 2.0f / t_b;
matrix[6] = 0.0f;
matrix[7] = 0.0f;
matrix[8] = 0.0f;
matrix[9] = 0.0f;
matrix[10] = -2.0f / f_n;
matrix[11] = 0.0f;
matrix[12] = tx;
matrix[13] = ty;
matrix[14] = tz;
matrix[15] = 1.0f;
}
// BT.709, standard for HDTV
static const GLfloat g_bt709[] = {
1.164, 1.164, 1.164,
0.0, -0.213, 2.112,
1.793, -0.533, 0.0,
};
const GLfloat *getColorMatrix_bt709() {
return g_bt709;
}
enum {
ATTRIBUTE_VERTEX,
ATTRIBUTE_TEXCOORD,
};
@implementation SJGLView {
EAGLContext *_context;
GLuint _framebuffer;
GLuint _renderbuffer;
GLint _backingWidth;
GLint _backingHeight;
GLfloat _vertices[8];
GLuint _program;
GLuint _av4Position;
GLuint _av2Texcoord;
GLuint _um4Mvp;
GLfloat _texcoords[8];
GLuint _us2Sampler[3];
GLuint _um3ColorConversion;
GLuint _textures[3];
SJDecoder *_decoder;
}
+ (Class)layerClass {
return [CAEAGLLayer class];
}
- (instancetype)initWithFrame:(CGRect)frame decoder:(SJDecoder *)decoder {
self = [super initWithFrame:frame];
if (self) {
_decoder = decoder;
[self setupGL];
}
return self;
}
- (void)layoutSubviews {
glBindRenderbuffer(GL_RENDERBUFFER, _renderbuffer);
[_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer*)self.layer];
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &_backingWidth);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &_backingHeight);
[self updateVertices];
[self render: nil];
}
- (void)setContentMode:(UIViewContentMode)contentMode
{
[super setContentMode:contentMode];
[self updateVertices];
[self render:nil];
}
- (void)setupGL {
_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
NSAssert(_context != nil, @"Failed to init EAGLContext");
CAEAGLLayer *eaglLayer= (CAEAGLLayer *)self.layer;
eaglLayer.opaque = YES;
eaglLayer.drawableProperties = @{
kEAGLDrawablePropertyRetainedBacking: [NSNumber numberWithBool:YES],
kEAGLDrawablePropertyColorFormat: kEAGLColorFormatRGBA8
};
[EAGLContext setCurrentContext:_context];
if ([self setupEAGLContext]) {
NSLog(@"Success to setup EAGLContext");
if ([self loadShaders]) {
NSLog(@"Success to load shader");
_us2Sampler[0] = glGetUniformLocation(_program, "us2_SamplerX");
_us2Sampler[1] = glGetUniformLocation(_program, "us2_SamplerY");
_us2Sampler[2] = glGetUniformLocation(_program, "us2_SamplerZ");
_um3ColorConversion = glGetUniformLocation(_program, "um3_ColorConversion");
}
}
}
- (BOOL)setupEAGLContext {
glGenFramebuffers(1, &_framebuffer);
glGenRenderbuffers(1, &_renderbuffer);
glBindFramebuffer(GL_FRAMEBUFFER, _framebuffer);
glBindRenderbuffer(GL_RENDERBUFFER, _renderbuffer);
[_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer *)self.layer];
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &_backingWidth);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &_backingHeight);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, _renderbuffer);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
NSLog(@"Failed to make complete framebuffer object: %x", status);
return NO;
}
GLenum glError = glGetError();
if (glError != GL_NO_ERROR) {
NSLog(@"Failed to setup EAGLContext: %x", glError);
return NO;
}
return YES;
}
- (BOOL)loadShaders {
NSString *vertexPath = [[NSBundle mainBundle] pathForResource:@"vertex" ofType:@"vsh"];
const char *vertexString = [[NSString stringWithContentsOfFile:vertexPath encoding:NSUTF8StringEncoding error:nil] UTF8String];
NSString *fragmentPath = _decoder.format == SJVideoFrameFormatYUV ? [[NSBundle mainBundle] pathForResource:@"yuv420p" ofType:@"fsh"] :
[[NSBundle mainBundle] pathForResource:@"rgb" ofType:@"fsh"];
const char *fragmentString = [[NSString stringWithContentsOfFile:fragmentPath encoding:NSUTF8StringEncoding error:nil] UTF8String];
GLuint vertexShader = sj_loadShader(GL_VERTEX_SHADER, vertexString);
GLuint fragmentShader = sj_loadShader(GL_FRAGMENT_SHADER, fragmentString);
_program = glCreateProgram();
glAttachShader(_program, vertexShader);
glAttachShader(_program, fragmentShader);
glLinkProgram(_program);
GLint link_status = GL_FALSE;
glGetProgramiv(_program, GL_LINK_STATUS, &link_status);
if(!link_status) goto fail;
_av4Position = glGetAttribLocation(_program, "av4_Position");
_av2Texcoord = glGetAttribLocation(_program, "av2_Texcoord");
_um4Mvp = glGetUniformLocation(_program, "um4_ModelViewProjection");
return YES;
fail:
sj_logProgramError(_program);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
glDeleteProgram(_program);
return NO;
}
- (void)useRenderer {
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glUseProgram(_program);
if (0 == _textures[0]) glGenTextures(3, _textures);
for (int i = 0; i < 3; i++) {
glActiveTexture(GL_TEXTURE0 + i);
glBindTexture(GL_TEXTURE_2D, _textures[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glUniform1i(_us2Sampler[i], i);
}
glUniformMatrix3fv(_um3ColorConversion, 1, GL_FALSE, getColorMatrix_bt709());
}
- (void)uploadTexture:(SJVideoFrame *)frame {
if (frame.format == SJVideoFrameFormatYUV) {
SJVideoYUVFrame *yuvFrame = (SJVideoYUVFrame *)frame;
const GLubyte *pixel[3] = { yuvFrame.luma.bytes, yuvFrame.chromaB.bytes, yuvFrame.chromaR.bytes };
const GLsizei widths[3] = { yuvFrame.width, yuvFrame.width/2, yuvFrame.width/2 };
const GLsizei heights[3] = { yuvFrame.height, yuvFrame.height/2, yuvFrame.height/2 };
for (int i = 0; i < 3; i++) {
glBindTexture(GL_TEXTURE_2D, _textures[i]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, widths[i], heights[i], 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, pixel[i]);
}
}
}
- (void)render:(SJVideoFrame *)frame {
[EAGLContext setCurrentContext:_context];
glUseProgram(_program);
[self useRenderer];
GLfloat modelviewProj[16];
loadOrtho(modelviewProj, -1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f);
glUniformMatrix4fv(_um4Mvp, 1, GL_FALSE, modelviewProj);
[self updateVertices];
[self updateTexcoords];
glBindFramebuffer(GL_FRAMEBUFFER, _framebuffer);
glViewport(0, 0, _backingWidth, _backingHeight);
[self uploadTexture:frame];
glClear(GL_COLOR_BUFFER_BIT);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindRenderbuffer(GL_RENDERBUFFER, _renderbuffer);
[_context presentRenderbuffer:GL_RENDERBUFFER];
}
- (void)updateVertices {
[self resetVertices];
BOOL fit = (self.contentMode == UIViewContentModeScaleAspectFit);
float width = _decoder.frameWidth;
float height = _decoder.frameHeight;
const float dW = (float)_backingWidth / width;
const float dH = (float)_backingHeight / height;
float dd = fit ? MIN(dH, dW) : MAX(dH, dW);
float nW = (width * dd / (float)_backingWidth);
float nH = (height * dd / (float)_backingHeight);
_vertices[0] = -nW;
_vertices[1] = -nH;
_vertices[2] = nW;
_vertices[3] = -nH;
_vertices[4] = -nW;
_vertices[5] = nH;
_vertices[6] = nW;
_vertices[7] = nH;
glVertexAttribPointer(_av4Position, 2, GL_FLOAT, GL_FALSE, 0, _vertices);
glEnableVertexAttribArray(_av4Position);
}
- (void)resetVertices {
_vertices[0] = -1.0f;
_vertices[1] = -1.0f;
_vertices[2] = 1.0f;
_vertices[3] = -1.0f;
_vertices[4] = -1.0f;
_vertices[5] = 1.0f;
_vertices[6] = 1.0f;
_vertices[7] = 1.0f;
}
- (void)updateTexcoords {
[self resetTexcoords];
glVertexAttribPointer(_av2Texcoord, 2, GL_FLOAT, GL_FALSE, 0, _texcoords);
glEnableVertexAttribArray(_av2Texcoord);
}
- (void)resetTexcoords {
_texcoords[0] = 0.0f;
_texcoords[1] = 1.0f;
_texcoords[2] = 1.0f;
_texcoords[3] = 1.0f;
_texcoords[4] = 0.0f;
_texcoords[5] = 0.0f;
_texcoords[6] = 1.0f;
_texcoords[7] = 0.0f;
}.fsh :
precision highp float;
varying highp vec2 vv2_Texcoord;
uniform mat3 um3_ColorConversion;
uniform lowp sampler2D us2_SamplerX;
uniform lowp sampler2D us2_SamplerY;
uniform lowp sampler2D us2_SamplerZ;
void main() {
mediump vec3 yuv;
lowp vec3 rgb;
yuv.x = (texture2D(us2_SamplerX, vv2_Texcoord).r - (16.0/255.0));
yuv.y = (texture2D(us2_SamplerY, vv2_Texcoord).r - 0.5);
yuv.z = (texture2D(us2_SamplerZ, vv2_Texcoord).r - 0.5);
rgb = um3_ColorConversion * yuva;
gl_FragColor = vec4(rgb, 1.0);
}.vsh file :
precision highp float;
varying highp vec2 vv2_Texcoord;
uniform lowp sampler2D us2_SamplerX;
void main() {
gl_FragColor = vec4(texture2D(us2_SamplerX, vv2_Texcoord).rgb, 1)
}Result image :
resultThe rgb image :
RGB image -
Evolution #3778 : [sécurité - inscription] : éviter l’envoi de mot de passe en clair par email et ...
24 mai 2016, par JF doglianiAu temps pour moi, la discussion avait été initiée de manière plus globale sur les "invités" lors de la sortie de la version 3.0.19 mais j’avais peut être testé sur une version + ancienne.
N’étant plus en charge de nos sites et ceux-ci ayant migré sous un cms concurrent, mes souvenirs sont plutôt moyens :-)
En tout cas, merci pour cette précision. -
Anomalie #3769 : form_hidden insère un hidden en trop
13 avril 2016, par jluc -Précision : ce test est fait en "URLs Simples"
(spip.php ?page=article&id_article=12)