bool Capture::init()
{
if (mVideoDevice.empty())
{
sgct::MessageHandler::instance()->print(sgct::MessageHandler::NOTIFY_ERROR, "No video device specified!\n");
cleanup();
return false;
}
initFFmpeg();
setupOptions();
// --------------------------------------------------
//check out https://ffmpeg.org/ffmpeg-devices.html
// --------------------------------------------------
AVInputFormat * iformat;
std::string inputName;
#ifdef __WIN32__
iformat = av_find_input_format("dshow");
inputName = "video=" + mVideoDevice;
#elif defined __APPLE__
iformat = av_find_input_format("avfoundation");
inputName = mVideoDevice;
#else //linux NOT-Tested
iformat = av_find_input_format("video4linux2");
inputName = mVideoDevice;
#endif
if (avformat_open_input(&mFMTContext, inputName.c_str(), iformat, &mOptions) < 0)
{
sgct::MessageHandler::instance()->print(sgct::MessageHandler::NOTIFY_ERROR, "Could not open capture input!\n");
cleanup();
return false;
}
/* retrieve stream information */
if (avformat_find_stream_info(mFMTContext, nullptr) < 0)
{
sgct::MessageHandler::instance()->print(sgct::MessageHandler::NOTIFY_ERROR, "Could not find stream information!\n");
cleanup();
return false;
}
if (!initVideoStream())
{
cleanup();
return false;
}
//dump format info to console
av_dump_format(mFMTContext, 0, inputName.c_str(), 0);
if (mVideoCodecContext)
{
if (!allocateVideoDecoderData(mVideoCodecContext->pix_fmt))
{
cleanup();
return false;
}
}
/* initialize packet, set data to nullptr, let the demuxer fill it */
av_init_packet(&mPkt);
mPkt.data = nullptr;
mPkt.size = 0;
//success
mInited = true;
return true;
}
status_t SoftFFmpegVideo::initDecoder() {
status_t status;
status = initFFmpeg();
if (status != OK)
return status;
mCtx = avcodec_alloc_context3(NULL);
if (!mCtx)
{
LOGE("avcodec_alloc_context failed.");
return OMX_ErrorInsufficientResources;
}
mCtx->codec_type = AVMEDIA_TYPE_VIDEO;
switch (mMode) {
case MODE_H264:
mCtx->codec_id = CODEC_ID_H264;
break;
case MODE_MPEG4:
mCtx->codec_id = CODEC_ID_MPEG4;
break;
case MODE_MPEG2:
mCtx->codec_id = CODEC_ID_MPEG2VIDEO;
break;
case MODE_H263:
mCtx->codec_id = CODEC_ID_H263;
// TODO, which?
//mCtx->codec_id = CODEC_ID_H263P;
//mCtx->codec_id = CODEC_ID_H263I;
break;
case MODE_VC1:
mCtx->codec_id = CODEC_ID_VC1;
break;
default:
CHECK(!"Should not be here. Unsupported codec");
break;
}
mCtx->codec = avcodec_find_decoder(mCtx->codec_id);
if (!mCtx->codec)
{
LOGE("find codec failed");
return OMX_ErrorNotImplemented;
}
setAVCtxToDefault(mCtx, mCtx->codec);
mCtx->extradata_size = 0;
mCtx->extradata = NULL;
mCtx->width = mWidth;
mCtx->height = mHeight;
#if 0
// FIXME, defer to open? ref: OMXCodec.cpp:setVideoOutputFormat
err = avcodec_open2(mCtx, mCtx->codec, NULL);
if (err < 0) {
LOGE("ffmpeg video decoder failed to initialize. (%d)", err);
return OMX_ErrorUndefined;
}
#endif
return OMX_ErrorNone;
}
