source: orxonox.OLD/branches/terrain/src/lib/graphics/importer/media_container.cc @ 8295

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

### File Specific:
   main-programmer: David Hasenfratz, Stephan Lienhard
   co-programmer:
*/



/* this is for debug output. It just says, that all calls to PRINT() belong to the DEBUG_MODULE_MEDIA module
   For more information refere to https://www.orxonox.net/cgi-bin/trac.cgi/wiki/DebugOutput
*/
#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_GRAPHICS


/* include your own header */
#include "media_container.h"

#include "util/loading/resource_manager.h"

/* header for debug output */
#include "debug.h"


/**
 * Default constructor
 */
MediaContainer::MediaContainer(const std::string& filename)
{
  // set the class id for the base object
  this->setClassID(CL_MEDIA_CONTAINER, "MediaContainer");

  fps = 0;
  mediaLoaded = false;
  if (!filename.empty())
    this->loadMedia(filename);
}

/**
 * Default destructor
 */
MediaContainer::~MediaContainer()
{
  this->unloadMedia();
}

void MediaContainer::unloadMedia()
{
  // check whether a movie is already loaded
  if(!mediaLoaded)
    return;

  fps = 0;

  // clear texturelist
  this->clearLists();

  if (glIsTexture(texture))
  glDeleteTextures(1, &texture);

  // Free the RGB image
  delete [] buffer;
  av_free(RGB_frame);

  // Free the frame
  av_free(frame);

  // Close the codec
  avcodec_close(codec_context);

  // Close the video file
  av_close_input_file(format_context);

  mediaLoaded = false;

}

bool MediaContainer::loadMedia(const std::string& filename)
{
  this->unloadMedia();

  if(filename.empty())
    return false;
  // check whether file exists
  if(!ResourceManager::isInDataDir(filename))
  {
    PRINTF(1)("Could not find %s\n", filename.c_str());
    return false;
  }

  // register all formats and codecs
  av_register_all();

  // Open video file
  if (av_open_input_file(&format_context, ResourceManager::getFullName(filename).c_str(), NULL, 0, NULL) !=0 )
  {
    PRINTF(1)("Could not open %s\n", ResourceManager::getFullName(filename).c_str());
    return false;
  }

  // Retrieve stream information
  if (av_find_stream_info(format_context) < 0)
  {
    PRINTF(1)("Could not find stream information in %s\n", ResourceManager::getFullName(filename).c_str());
    return false;
  }

  // Find the first video stream and take it
  video_stream = av_find_default_stream_index(format_context);

  if(video_stream == -1)
  {
    PRINTF(1)("Could not find a video stream in %s\n", ResourceManager::getFullName(filename).c_str());
    return false;
  }

  // Get a pointer to the codec context for the video stream
  codec_context = format_context->streams[video_stream]->codec;

  // Find the decoder for the video stream
  codec = avcodec_find_decoder(codec_context->codec_id);
  if (codec == NULL)
  {
    PRINTF(1)("Could not find codec\n");
    return false;
  }

  // Open codec
  if (avcodec_open(codec_context, codec) < 0)
  {
    PRINTF(1)("Could not open codec\n");
    return false;
  }

  // Allocate video frame
  frame = avcodec_alloc_frame();
  RGB_frame = avcodec_alloc_frame();

  // Determine required buffer size and allocate buffer
  num_bytes = avpicture_get_size(PIX_FMT_RGB24, codec_context->width, codec_context->height);
  buffer=new uint8_t[num_bytes];

  // data buffer for the texture
  data = new uint8_t[codec_context->width*codec_context->height*3*sizeof(uint8_t)];

  // Assign appropriate parts of buffer to image planes in RGB_frame
  avpicture_fill((AVPicture *)RGB_frame, buffer, PIX_FMT_RGB24, codec_context->width, codec_context->height);

  // Calculate fps
  fps = av_q2d(format_context->streams[video_stream]->r_frame_rate);
  // NOTE: fix this fps problem!!
  if(fps < 0 || fps > 1000)
    fps = 30;

  // read the frames and save them in a sequence as textures
  this->loadFrames();
  mediaLoaded = true;

  return true;
}

double MediaContainer::getFPS()
{
  return this->fps;
}

void MediaContainer::loadFrames()
{
  // empty texture list
  this->clearLists();

  // go to the begin of the video
  av_seek_frame(format_context, video_stream, 0, AVSEEK_FLAG_BACKWARD);

  // get all the frames and save them in the sequence
  while(this->addFrame(this->getNextFrame()) != NULL);
}


GLuint MediaContainer::getNextFrame()
{

  // get next frame
  if(av_read_frame(format_context, &packet) >= 0)
  {
    // Is this a packet from the video stream?
    if(packet.stream_index == video_stream)
    {
      int frame_finished;
      // Decode video frame
      avcodec_decode_video(codec_context, frame, &frame_finished,
                           packet.data, packet.size);

      // Free the packet that was allocated by av_read_frame
      av_free_packet(&packet);

      // Did we get a video frame?
      if(frame_finished)
      {
        // Conversion from YUV to RGB
        // Most codecs return images in YUV 420 format
        // (one luminance and two chrominance channels, with the chrominance
        // channels samples at half the spatial resolution of the luminance channel)
        img_convert((AVPicture*)RGB_frame, PIX_FMT_RGB24, (AVPicture*)frame,
                    codec_context->pix_fmt, codec_context->width, codec_context->height);

        for(int i = 0; i < codec_context->height; i++)
          memcpy(&data[i*codec_context->width*3],
                 ((AVPicture*)RGB_frame)->data[0]+i *
                 ((AVPicture*)RGB_frame)->linesize[0],
                  codec_context->width*sizeof(uint8_t)*3);

        // Create an OpenGL texture
        glGenTextures(1, &texture);
        glBindTexture(GL_TEXTURE_2D, texture);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        // create the texture
        glTexImage2D(GL_TEXTURE_2D,
                    0,
                    GL_RGB,
                    codec_context->width, codec_context->height,
                    0,
                    GL_RGB,
                    GL_UNSIGNED_BYTE,
                    data);
        // build the MipMaps
        gluBuild2DMipmaps(GL_TEXTURE_2D,
                        GL_RGB,
                        codec_context->width,
                        codec_context->height,
                        GL_RGB,
                        GL_UNSIGNED_BYTE,
                        data);
        glBindTexture(GL_TEXTURE_2D, 0);

        return texture;
      }
      else
      {
        av_free_packet(&packet);
        return this->getNextFrame();
      }
    }
    else
    {
      av_free_packet(&packet);
      return this->getNextFrame();
    }
  }
  else
    return 0;
}