| int Impala::Core::Stream::Lavc::VideoAccessObject::DecodeFrame | ( | int * | resultCode | ) | const [inline] |
Attempts to decode a video frame from the currently buffered packet.
Definition at line 420 of file VideoAccessObject.h.
References CurrentPacketIsVideo(), ILOG_DEBUG, ILOG_ERROR, mFrame, mFrameValid, mPacket, and mVideoCodecCtx.
Referenced by Impala::Core::Stream::Lavc::VideoAccessStrategy::DecodeNextFrame(), and Impala::Core::Stream::Lavc::StrategyIgnoringNativeIndex::ProcessPacket().
00421 { 00422 mFrameValid = false; 00423 00424 if (!CurrentPacketIsVideo()) 00425 { 00426 ILOG_ERROR("Attempt to decode video frame from non-video packet"); 00427 return -1; 00428 } 00429 00430 const int len = avcodec_decode_video(mVideoCodecCtx, 00431 mFrame, resultCode, mPacket->data, mPacket->size); 00432 // from avcodec.h (v5.1): 00433 // resultCode : 0 if no frame could be decompressed, 00434 // otherwise, it is nonzero. 00435 // len : On error a negative value is returned, otherwise the 00436 // number of bytes used or zero if no frame could be 00437 // decompressed. 00438 00439 if (len < 0) 00440 { 00441 // indicates an error condition according to avcodec.h 00442 00443 //if (len < -1) 00444 //{ 00445 ILOG_DEBUG("avcodec_decode_video returned " << len << 00446 " (negative value) indicating an error occurred"); 00447 //} 00448 //else 00449 //{ 00450 //} 00451 } 00452 else if (len == 0) 00453 { 00454 if (*resultCode != 0) 00455 ILOG_DEBUG("Failed assumption on avcodec_decode_video: " << 00456 "len=0 (no frame decompressed, but not an error) " << 00457 "but resultCode=" << *resultCode <<" (non-zero)"); 00458 } 00459 //else if (*resultCode == 0) 00460 //{ 00461 // ILOG_DEBUG("Failed assumption on avcodec_decode_video: " << 00462 // "len>0 (bytes used for decompressed frame, no error occurred) " << 00463 // "but resultCode=0 (no frame could be decompressed)"); 00464 //} 00465 00466 mFrameValid = true; 00467 return len; 00468 }
Here is the call graph for this function:
