It will install the FFmpegVideoPlayer as a frame listener so all you have to do i interact with the singleton. The video player will replace an existing texture in an existing texture unit in an existing material with the video.
This means that you can use a video as input for your already existing shader pipeline!
As soon as the buffer is filled, playback starts and the original texture unit's texture is replaced by the video.
When the video is finished, the original texture is restored.
But you don't have to use the video player for video playback. you can use it to decode only and take part of the playback all by yourself.
See Usage for more.
First of all, make sure the header is included: ```c++ #include "FFmpegVideoPlayer.h" ```
The basic usage is to first set some options, and then start playing the video.
You can use the FFMPEG_PLAYER define to have a shorter access to the singleton:
// Set the material name to play on
// IMPORTANT: The material has to exist!
FFMPEG_PLAYER->setMaterialName("VideoMaterial");
// Set the texture unit name to play on
// IMPORTANT: The material above must have a texture unit with that name!
FFMPEG_PLAYER->setTextureUnitName("VideoTextureUnit");
// Set the buffer target for the video player.
// This is the time the buffer will fill before starting playback, and also the time it will always
// try to hold in the buffers.
// As soon as both the audio and the video buffers hold the target time, decoding is stopped until
// at least one of the buffers
// hold less than the target time.
FFMPEG_PLAYER->setBufferTarget(1.5);
// Set the name of the video file
FFMPEG_PLAYER->setVideoFilename("MyVideo.avi");
// Should the video loop?
FFMPEG_PLAYER->setIsLooping(false);
// Set the forced number of audio channels
// If this is not set, the number of channels of the video file will be used (which will in most
// cases be stereo)
// You can set this to 0 manually to force using the video's number of channels.
// Any number higher than 2 will most likely break something
// IMPORTANT: OpenAL needs to have mono sound for 3D audio effects
FFMPEG_PLAYER->setForcedAudioChannels(1);
// Set the log level of the player's own log file.
FFMPEG_PLAYER->setLogLevel(LOGLEVEL_NORMAL);
// Play the video
// Remember: this is video only, no audio
if (!FFMPEG_PLAYER->startPlaying())
{
// print error
}It does not play the audio in any way. You will have to take care of that.
The player offers a function that will fill some buffers with decoded audio frames for you: ```c++ int distributeDecodedAudioFrames( unsigned int p_numBuffers, std::vector& p_outAudioBuffers, std::vector& p_outAudioBufferSizes, double& p_outTotalBuffersTime); ```
I've written the player with OpenAL in mind and it works fine with that, so I put the class we use in our project (slightly changed) as an example into the repository.
But it should also be possible to use the above function to play the audio with another library.
As we will be using it to play OGG (vorbis & theora) files, I've added those to the CMake script for easier access.
But you can use your own additions to FFmpeg.
I have tested a video in the following container formats successfully:
avi, flv, ogv, mp4, 3gp, webm, mpg
The following did not work in my tests:
wmv (but who needs that, anyway?) Not by using the FFMPEG_PLAYER define. Each class of the FFmpegVideoPlayer can only play one video at a time.
But I have made the constructor of that class public (it is not really a singleton, I know).
So you should be able to create as many FFmpegVideoPlayers as you want to play videos.
I have not tested this, though, so I do not guarantee anything. The MIT License (MIT)
Copyright (c) 2014 Jan "TheSHEEEP" Drabner (jan@jdrabner.eu)
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