| int Impala::Core::Stream::RgbDataSrcLavc_old::DecodeNextFrame | ( | bool & | isValidFrame, | |
| bool & | isKeyFrame | |||
| ) | [inline, private] |
Definition at line 1352 of file RgbDataSrcLavc_old.h.
References ILOG_DEBUG, ILOG_WARN, and Impala::Max().
Referenced by FindNextDecodedFrame().
01353 { 01354 //avcodec_get_frame_defaults(mFrame); 01355 01356 const int MAX_READ_FAILURES = Impala::Max(15, 5 * mGopSize); 01357 int nrOfReadFailures = 0; 01358 01359 int atEndOfFile = 01360 #ifdef FFMPEG_52 01361 url_feof(mFormatCtx->pb); 01362 #else 01363 url_feof(&mFormatCtx->pb); 01364 #endif 01365 //if (atEndOfFile != 0) 01366 // return -1; 01367 01368 bool readFrameFailed = false; 01369 01370 isValidFrame = false; 01371 isKeyFrame = false; 01372 int rc = 0; 01373 while (true) 01374 { 01375 int readFrameResult = av_read_frame(mFormatCtx, mPacket); 01376 readFrameFailed = (readFrameResult < 0); 01377 if (readFrameFailed) 01378 { 01379 // upon a negative value, there may still be 01380 // valid frames left to decode 01381 ILOG_DEBUG("av_read_frame failed and returned: " << readFrameResult); 01382 } 01383 01384 //ILOG_DEBUG(" video stream's curdts=" << mVideoStream->cur_dts << " mPacket->dts=" << mPacket->dts); 01385 //ILOG_DEBUG(" [DecodeNextFrame] mPacket->size=" << mPacket->size << "; mPacket->flags=" << mPacket->flags << "; bp.pos=" << mFormatCtx->pb.pos); 01386 01387 if (mPacket->stream_index == mVideoStreamIndex) 01388 { 01389 int frameDecoded = -1; 01390 01391 //int len = avcodec_decode_video(mCodecCtx, mFrame, &frameDecoded, 01392 // mPacket->data, mPacket->size); 01393 01394 // provide buffer padding cf. definition of avcodec_decode_video; 01395 // unsure if required here, but rather safe than sorry... 01396 const int bufSize = mPacket->size; 01397 uint8_t *buf = new uint8_t[bufSize + FF_INPUT_BUFFER_PADDING_SIZE]; 01398 for (int i = 0; i < bufSize; i++) 01399 buf[i] = (mPacket->data)[i]; 01400 for (int i = 0; i < FF_INPUT_BUFFER_PADDING_SIZE; i++) 01401 buf[bufSize + i] = 0; 01402 int len = avcodec_decode_video(mCodecCtx, mFrame, &frameDecoded, 01403 buf, bufSize); 01404 delete [] buf; 01405 01406 ILOG_DEBUG("mPacket->pts = " << mPacket->pts << " ; mPacket->dts = " << mPacket->dts); 01407 if (len < 0) 01408 ILOG_DEBUG(" avcodec_decode_video returned: " << len); // implies: frameDecoded==false 01409 01410 if (frameDecoded) 01411 { 01412 isValidFrame = true; 01413 isKeyFrame = (mFrame->pict_type==FF_I_TYPE && mFrame->key_frame==1); 01414 break; 01415 } 01416 else 01417 { 01418 #ifdef FFMPEG_52 01419 ILOG_DEBUG( 01420 " [DecodeNextFrame] Frame not valid; mPacket->size=" << 01421 mPacket->size << "; mPacket->flags=" << 01422 mPacket->flags << "; bp->pos=" << mFormatCtx->pb->pos); 01423 #else 01424 ILOG_DEBUG( 01425 " [DecodeNextFrame] Frame not valid; mPacket->size=" << 01426 mPacket->size << "; mPacket->flags=" << 01427 mPacket->flags << "; bp.pos=" << mFormatCtx->pb.pos); 01428 #endif 01429 01430 // don't continue if reading reached eof 01431 if (atEndOfFile) 01432 { 01433 rc = -3; 01434 break; 01435 } 01436 01437 // mPacket->flags unequal zero seems to indicate incomplete 01438 // frames other than P or B frames missing I or P frame data 01439 if (mPacket->flags == 0) 01440 break; 01441 } 01442 } 01443 01444 av_free_packet(mPacket); 01445 01446 // while the read buffer already reached the eof, there may 01447 // still be some valid frames left to decode! 01448 nrOfReadFailures++; 01449 if ((atEndOfFile || readFrameFailed) && (nrOfReadFailures > MAX_READ_FAILURES)) 01450 { 01451 ILOG_WARN("Max. nr of frame read failures reached (" << 01452 MAX_READ_FAILURES << "); probably at end of file"); 01453 rc = -1; 01454 break; 01455 } 01456 } 01457 01458 av_free_packet(mPacket); 01459 return rc; 01460 }
Here is the call graph for this function:
