std::string MovieDecoder::createScaleString(int size, bool maintainAspectRatio)
{
std::stringstream scale;
if (!maintainAspectRatio)
{
scale << "w=" << size << ":h=" << size;
}
else
{
auto width = GetVideoWidth();
auto height = GetVideoHeight();
AVRational par = av_guess_sample_aspect_ratio(m_pFormatContext, m_pVideoStream, m_pFrame);
// if the pixel aspect ratio is defined and is not 1, we have an anamorphic stream
bool anamorphic = par.num != 0 && par.num != par.den;
if (anamorphic)
{
width = width * par.num / par.den;
}
if (height > width)
{
scale << "w=-1:h=" << (size == 0 ? height : size);
}
else
{
scale << "h=-1:w=" << (size == 0 ? width : size);
}
}
return scale.str();
}
int MovieDecoder::getWidth()
{
if (m_pVideoCodecContext)
{
return GetVideoWidth();
}
return -1;
}
void MovieDecoder::calculateDimensions(int squareSize, bool maintainAspectRatio, int& destWidth, int& destHeight)
{
if (squareSize == 0)
{
// use original video size
squareSize = max(GetVideoWidth(), GetVideoHeigth());
}
if (!maintainAspectRatio)
{
destWidth = squareSize;
destHeight = squareSize;
}
else
{
int srcWidth = GetVideoWidth();
int srcHeight = GetVideoHeigth();
int ascpectNominator = m_pVideoCodecContext->sample_aspect_ratio.num;
int ascpectDenominator = m_pVideoCodecContext->sample_aspect_ratio.den;
if (ascpectNominator != 0 && ascpectDenominator != 0)
{
srcWidth = srcWidth * ascpectNominator / ascpectDenominator;
}
if (srcWidth > srcHeight)
{
destWidth = squareSize;
destHeight = static_cast<int>(static_cast<float>(squareSize) / srcWidth * srcHeight);
}
else
{
destWidth = static_cast<int>(static_cast<float>(squareSize) / srcHeight * srcWidth);
destHeight = squareSize;
}
}
}
gameLevel * setLevel(gameLevel *gl)
{
gl->xview=0;
gl->yview=0;
gl->view.buf=GetVideo();
gl->view.resx=GetVideoWidth();
gl->view.resy=GetVideoHeight();
gl->idxLoadActor=0;
gl->stateGame=0;
cloneImage(&gl->view,&gl->frame);
runStateGame=0;
flgRun=1;
return gl;
}
void MovieDecoder::getScaledVideoFrame(int scaledSize, bool maintainAspectRatio, VideoFrame& videoFrame)
{
if (m_pFrame->interlaced_frame)
{
avpicture_deinterlace((AVPicture*) m_pFrame, (AVPicture*) m_pFrame, m_pVideoCodecContext->pix_fmt,
GetVideoWidth(), GetVideoHeigth());
}
int scaledWidth, scaledHeight;
convertAndScaleFrame(PIX_FMT_RGBA, scaledSize, maintainAspectRatio, scaledWidth, scaledHeight);
videoFrame.width = scaledWidth;
videoFrame.height = scaledHeight;
videoFrame.lineSize = m_pFrame->linesize[0];
if(videoFrame.frameData != nullptr)
delete videoFrame.frameData;
videoFrame.frameData = new uint8_t[videoFrame.lineSize * videoFrame.height];
memcpy(videoFrame.frameData, m_pFrame->data[0], videoFrame.lineSize * videoFrame.height);
}
void MovieDecoder::convertAndScaleFrame(PixelFormat format, int scaledSize, bool maintainAspectRatio, int& scaledWidth, int& scaledHeight)
{
calculateDimensions(scaledSize, maintainAspectRatio, scaledWidth, scaledHeight);
#ifdef LATEST_GREATEST_FFMPEG
// Enable this when it hits the released ffmpeg version
SwsContext* scaleContext = sws_alloc_context();
if (scaleContext == nullptr)
{
throw std::logic_error("Failed to allocate scale context");
}
av_opt_set_int(scaleContext, "srcw", GetVideoWidth(),0);
av_opt_set_int(scaleContext, "srch", GetVideoHeigth(),0);
av_opt_set_int(scaleContext, "src_format", m_pVideoCodecContext->pix_fmt,0);
av_opt_set_int(scaleContext, "dstw", scaledWidth,0);
av_opt_set_int(scaleContext, "dsth", scaledHeight,0);
av_opt_set_int(scaleContext, "dst_format", format,0);
av_opt_set_int(scaleContext, "sws_flags", SWS_BICUBIC,0);
const int* coeff = sws_getCoefficients(SWS_CS_DEFAULT);
if (sws_setColorspaceDetails(scaleContext, coeff, m_pVideoCodecContext->pix_fmt, coeff, format, 0, 1<<16, 1<<16) < 0)
{
sws_freeContext(scaleContext);
throw std::logic_error("Failed to set colorspace details");
}
if (sws_init_context(scaleContext, nullptr, nullptr) < 0)
{
sws_freeContext(scaleContext);
throw std::logic_error("Failed to initialise scale context");
}
#else
SwsContext* scaleContext = sws_getContext(GetVideoWidth(), GetVideoHeigth(),
m_pVideoCodecContext->pix_fmt, scaledWidth, scaledHeight,
format, SWS_BICUBIC, nullptr, nullptr, nullptr);
#endif
if (nullptr == scaleContext)
{
throw logic_error("Failed to create resize context");
}
AVFrame* convertedFrame = nullptr;
uint8_t* convertedFrameBuffer = nullptr;
createAVFrame(&convertedFrame, &convertedFrameBuffer, scaledWidth, scaledHeight, format);
sws_scale(scaleContext, m_pFrame->data, m_pFrame->linesize, 0, GetVideoHeigth(),
convertedFrame->data, convertedFrame->linesize);
sws_freeContext(scaleContext);
av_free(m_pFrame);
av_free(m_pFrameBuffer);
m_pFrame = convertedFrame;
m_pFrameBuffer = convertedFrameBuffer;
}
void MovieDecoder::initializeFilterGraph(const AVRational& timeBase, int size, bool maintainAspectRatio)
{
static const AVPixelFormat pixelFormats[] = { AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
auto del = [] (AVBufferSinkParams* p) { av_freep(p); };
std::unique_ptr<AVBufferSinkParams, decltype(del)> buffersinkParams(av_buffersink_params_alloc(), del);
m_pFilterGraph = avfilter_graph_alloc();
assert(m_pFilterGraph);
std::stringstream ss;
ss << "video_size=" << GetVideoWidth() << "x" << GetVideoHeight()
<< ":pix_fmt=" << m_pVideoCodecContext->pix_fmt
<< ":time_base=" << timeBase.num << "/" << timeBase.den
<< ":pixel_aspect=" << m_pVideoCodecContext->sample_aspect_ratio.num << "/" << FFMAX(m_pVideoCodecContext->sample_aspect_ratio.den, 1);
checkRc(avfilter_graph_create_filter(&m_pFilterSource, avfilter_get_by_name("buffer"), "thumb_buffer", ss.str().c_str(), nullptr, m_pFilterGraph),
"Failed to create filter source");
buffersinkParams->pixel_fmts = pixelFormats;
checkRc(avfilter_graph_create_filter(&m_pFilterSink, avfilter_get_by_name("buffersink"), "thumb_buffersink", nullptr, buffersinkParams.get(), m_pFilterGraph),
"Failed to create filter sink");
buffersinkParams.release();
AVFilterContext* yadifFilter = nullptr;
if (m_pFrame->interlaced_frame != 0)
{
checkRc(avfilter_graph_create_filter(&yadifFilter, avfilter_get_by_name("yadif"), "thumb_deint", "deint=1", nullptr, m_pFilterGraph),
"Failed to create deinterlace filter");
}
AVFilterContext* scaleFilter = nullptr;
checkRc(avfilter_graph_create_filter(&scaleFilter, avfilter_get_by_name("scale"), "thumb_scale", createScaleString(size, maintainAspectRatio).c_str(), nullptr, m_pFilterGraph),
"Failed to create scale filter");
AVFilterContext* formatFilter = nullptr;
checkRc(avfilter_graph_create_filter(&formatFilter, avfilter_get_by_name("format"), "thumb_format", "pix_fmts=bgra", nullptr, m_pFilterGraph),
"Failed to create format filter");
AVFilterContext* rotateFilter = nullptr;
auto rotation = getStreamRotation();
if (rotation != -1)
{
checkRc(avfilter_graph_create_filter(&rotateFilter, avfilter_get_by_name("transpose"), "thumb_rotate", to_string(rotation).c_str(), nullptr, m_pFilterGraph),
"Failed to create rotate filter");
}
checkRc(avfilter_link(rotateFilter ? rotateFilter : formatFilter, 0, m_pFilterSink, 0), "Failed to link final filter");
if (rotateFilter)
{
checkRc(avfilter_link(formatFilter, 0, rotateFilter, 0), "Failed to link format filter");
}
checkRc(avfilter_link(scaleFilter, 0, formatFilter, 0), "Failed to link scale filter");
if (yadifFilter)
{
checkRc(avfilter_link(yadifFilter, 0, scaleFilter, 0), "Failed to link yadif filter");
}
checkRc(avfilter_link(m_pFilterSource, 0, yadifFilter ? yadifFilter : scaleFilter, 0), "Failed to link source filter");
checkRc(avfilter_graph_config(m_pFilterGraph, nullptr), "Failed to configure filter graph");
}
