int VideoDecoder::GetAVBuffer(AVCodecContext *Context, AVFrame *Frame)
{
VideoFrame *frame = m_videoParent->GetBuffers()->GetFrameForDecoding();
if (!frame)
return -1;
if (Context->width != frame->m_rawWidth || Context->height != frame->m_rawHeight || Context->pix_fmt != frame->m_pixelFormat)
LOG(VB_GENERAL, LOG_ERR, "Frame format changed");
// start frame initalisation
Frame->opaque = frame;
Frame->type = FF_BUFFER_TYPE_USER;
Frame->pkt_pts = Context->pkt ? Context->pkt->pts : AV_NOPTS_VALUE;
Frame->pkt_dts = Context->pkt ? Context->pkt->dts : AV_NOPTS_VALUE;
Frame->width = frame->m_rawWidth;
Frame->height = frame->m_rawHeight;
Frame->format = frame->m_pixelFormat;
Frame->sample_aspect_ratio = Context->sample_aspect_ratio;
// initialise hardware context
// FIXME this needs a failure mode so that we don't always fallback to a software frame
bool initialised = false;
AccelerationFactory* factory = AccelerationFactory::GetAccelerationFactory();
for ( ; factory; factory = factory->NextFactory())
{
if (factory->InitialiseBuffer(Context, Frame, frame))
{
initialised = true;
break;
}
}
// or fallback to software decoding
if (!initialised)
{
frame->InitialiseBuffer();
for (int i = 0; i < 4; i++)
{
Frame->data[i] = frame->m_buffer + frame->m_offsets[i];
Frame->base[i] = Frame->data[i];
Frame->linesize[i] = frame->m_pitches[i];
}
}
// finish frame initialisation
Frame->extended_data = Frame->data;
return 0;
}
