In my decoder I want to extract SPS, PPS and VPS by attaching two mfxExtBuffer to the mfxVideoParam struct.
MFX_EXTBUFF_CODING_OPTION_VPS and MFX_EXTBUFF_CODING_OPTION_SPSPPS
Like this ->
mfxExtCodingOptionSPSPPS lSpsPpsOption;
mfxExtCodingOptionVPS lVpsOption;
mfxExtBuffer *lpExtendedBuffers[2];
/* configure mfxExtCodingOptionVPS */
memset(&lVpsOption, 0, sizeof(lVpsOption));
lVpsOption.Header.BufferId = MFX_EXTBUFF_CODING_OPTION_VPS;
lVpsOption.Header.BufferSz = sizeof(lVpsOption);
lVpsOption.VPSBuffer = (mfxU8 *) mDecodedVpsData.data();
lVpsOption.VPSBufSize = mDecodedVpsData.size();
lpExtendedBuffers[0] = (mfxExtBuffer *) &lVpsOption;
/* configure mfxExtCodingOptionSPSPPS */
memset(&lSpsPpsOption, 0, sizeof(lSpsPpsOption));
lSpsPpsOption.Header.BufferId = MFX_EXTBUFF_CODING_OPTION_SPSPPS;
lSpsPpsOption.Header.BufferSz = sizeof(lSpsPpsOption);
lSpsPpsOption.SPSBuffer = (mfxU8 *) mDecodedSpsData.data();
lSpsPpsOption.SPSBufSize = mDecodedSpsData.size();
lSpsPpsOption.PPSBuffer = (mfxU8 *) mDecodedPpsData.data();
lSpsPpsOption.PPSBufSize = mDecodedPpsData.size();
lpExtendedBuffers[1] = (mfxExtBuffer *) &lSpsPpsOption;
mSpeculativeVideoParams.ExtParam = lpExtendedBuffers;
mSpeculativeVideoParams.NumExtParam = 2;
lResult = mDecoder->DecodeHeader(pInBitstream, &mSpeculativeVideoParams);
The data buffers are initialised like this ->
std::vector<uint8_t> mDecodedSpsData = std::vector<uint8_t>(128);
std::vector<uint8_t> mDecodedPpsData = std::vector<uint8_t>(128);
std::vector<uint8_t> mDecodedVpsData = std::vector<uint8_t>(128);
Then after running the DecodeHeader I loop trough the buffers to see if I got my parameters.
Notification: Video format has changed
Notification: vps 128
Notification: sps 93
Notification: pps 11
So yes I got the SPS and PPS but not the VPS (since size is untouched at 128 bytes and there is no data when I look in the data buffer)
I then wrote my own code extracting the parameter sets of the bitstream and my code finds SPS,PPS and VPS this is the result .>
Notification: Found VPS size > 33
Notification: NAL 32
Notification: Found SPS size > 89
Notification: NAL 33
Notification: Found PPS size > 7
Notification: NAL 34
Notification: NAL 39
Notification: NAL 19
(My extraxtor is not including the 4 start bytes that's why the size is different)
How do I use MFX_EXTBUFF_CODING_OPTION_VPS to extract VPS using DecodeHeader? Do I need to set any other flag or attach any other structs to the mfxVideoParam?
/Anders
