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- /*===========================================================================*
- * pframe.c *
- * *
- * Procedures concerned with generation of P-frames *
- * *
- * EXPORTED PROCEDURES: *
- * GenPFrame *
- * ResetPFrameStats *
- * ShowPFrameSummary *
- * EstimateSecondsPerPFrame *
- * ComputeHalfPixelData *
- * SetPQScale *
- * GetPQScale *
- * *
- * NOTE: when motion vectors are passed as arguments, they are passed as *
- * twice their value. In other words, a motion vector of (3,4) will *
- * be passed as (6,8). This allows half-pixel motion vectors to be *
- * passed as integers. This is true throughout the program. *
- * *
- *===========================================================================*/
-
- /*
- * Copyright (c) 1993 The Regents of the University of California.
- * All rights reserved.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose, without fee, and without written agreement is
- * hereby granted, provided that the above copyright notice and the following
- * two paragraphs appear in all copies of this software.
- *
- * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
- * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
- * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
- * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
- * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- */
-
- /*
- * $Header: /n/picasso/users/keving/encode/src/RCS/pframe.c,v 1.5 1993/07/22 22:23:43 keving Exp keving $
- * $Log: pframe.c,v $
- * Revision 1.5 1993/07/22 22:23:43 keving
- * nothing
- *
- * Revision 1.4 1993/06/30 20:06:09 keving
- * nothing
- *
- * Revision 1.3 1993/06/03 21:08:08 keving
- * nothing
- *
- * Revision 1.2 1993/03/02 23:03:42 keving
- * nothing
- *
- * Revision 1.1 1993/02/19 19:14:12 keving
- * nothing
- *
- */
-
-
- /*==============*
- * HEADER FILES *
- *==============*/
-
- /* @@@ Fake up 'times' interface under OS/2, Andy Key */
- #ifdef OS2
- #include "os2port.h"
- #else
- #include <sys/times.h>
- #endif
- #include "all.h"
- #include "mtypes.h"
- #include "bitio.h"
- #include "frames.h"
- #ifdef OS2
- /* @@@ FAT 8.3 convention */
- #include "prototyp.h"
- #else
- #include "prototypes.h"
- #endif
- #include "param.h"
- #include "mheaders.h"
- #include "fsize.h"
- #include "postdct.h"
- #include "mpeg.h"
- #include "parallel.h"
-
-
- /*==================*
- * STATIC VARIABLES *
- *==================*/
-
- static int32 zeroDiff;
- static int numPIBlocks = 0;
- static int numPPBlocks = 0;
- static int numPSkipped = 0;
- static int numPIBits = 0;
- static int numPPBits = 0;
- static int numFrames = 0;
- static int numFrameBits = 0;
- static int32 totalTime = 0;
- static int qscaleP;
- static float totalSNR = 0.0;
- static float totalPSNR = 0.0;
-
-
- /*===============================*
- * INTERNAL PROCEDURE prototypes *
- *===============================*/
-
- static boolean ZeroMotionBetter _ANSI_ARGS_((LumBlock currentBlock,
- MpegFrame *prev, int by, int bx,
- int my, int mx));
- static boolean DoIntraCode _ANSI_ARGS_((LumBlock currentBlock,
- MpegFrame *prev, int by, int bx,
- int motionY, int motionX));
- static boolean ZeroMotionSufficient _ANSI_ARGS_((LumBlock currentBlock,
- MpegFrame *prev,
- int by, int bx));
-
- #ifdef BLEAH
- static void ComputeAndPrintPframeMAD _ANSI_ARGS_((LumBlock currentBlock,
- MpegFrame *prev,
- int by, int bx,
- int my, int mx,
- int numBlock));
- #endif
-
-
- /*=====================*
- * EXPORTED PROCEDURES *
- *=====================*/
-
- /*===========================================================================*
- *
- * GenPFrame
- *
- * generate a P-frame from previous frame, adding the result to the
- * given bit bucket
- *
- * RETURNS: frame appended to bb
- *
- * SIDE EFFECTS: none
- *
- *===========================================================================*/
- void
- GenPFrame(bb, current, prev)
- BitBucket *bb;
- MpegFrame *current;
- MpegFrame *prev;
- {
- FlatBlock fba[6], fb[6];
- Block dec[6];
- int32 y_dc_pred, cr_dc_pred, cb_dc_pred;
- int x, y;
- int motionX = 0, motionY = 0;
- int oldMotionX = 0, oldMotionY = 0;
- int offsetX, offsetY;
- int tempX, tempY;
- int motionXrem, motionXquot;
- int motionYrem, motionYquot;
- int pattern;
- int mbAddrInc = 1;
- boolean useMotion;
- int numIBlocks = 0;
- int numPBlocks = 0;
- int numSkipped = 0;
- int numIBits = 0;
- int numPBits = 0;
- int totalBits;
- int totalFrameBits;
- struct tms timeBuffer;
- int32 startTime, endTime;
- int numBlocks = -1;
- int lastBlockX, lastBlockY;
- int lastX, lastY;
- int fy, fx;
- LumBlock currentBlock;
- register int ix, iy;
- int frameBlocks;
- int slicePos;
- register int index;
- float snr[3], psnr[3];
-
- numFrames++;
- totalFrameBits = bb->cumulativeBits;
- times(&timeBuffer);
- startTime = timeBuffer.tms_utime + timeBuffer.tms_stime;
-
- DBG_PRINT(("Generating pframe\n"));
-
- Mhead_GenPictureHeader(bb, P_FRAME, current->id, fCode);
-
- DBG_PRINT(("Slice Header\n"));
- Mhead_GenSliceHeader(bb, 1, qscaleP, NULL, 0);
-
- if ( referenceFrame == DECODED_FRAME ) {
- Frame_AllocDecoded(current, TRUE);
- } else if ( printSNR ) {
- Frame_AllocDecoded(current, FALSE);
- }
-
- /* don't do dct on blocks yet */
- Frame_AllocBlocks(current);
- BlockifyFrame(current);
-
- /* for I-blocks */
- y_dc_pred = cr_dc_pred = cb_dc_pred = 128;
-
- totalBits = bb->cumulativeBits;
-
- if ( (! pixelFullSearch) && (! prev->halfComputed) ) {
- ComputeHalfPixelData(prev);
- }
-
- lastBlockX = Fsize_x/8;
- lastBlockY = Fsize_y/8;
- lastX = lastBlockX-2;
- lastY = lastBlockY-2;
- frameBlocks = 0;
-
- for (y = 0; y < lastBlockY; y += 2) {
- for (x = 0; x < lastBlockX; x += 2) {
- slicePos = (frameBlocks % blocksPerSlice);
-
- if ( (slicePos == 0) && (frameBlocks != 0) ) {
- Mhead_GenSliceEnder(bb);
- Mhead_GenSliceHeader(bb, 1+(y/2), qscaleP, NULL, 0);
-
- /* reset everything */
- oldMotionX = 0; oldMotionY = 0;
- y_dc_pred = cr_dc_pred = cb_dc_pred = 128;
-
- mbAddrInc = 1+(x/2);
- }
-
- numBlocks++;
- frameBlocks++;
-
- /* compute currentBlock */
- BLOCK_TO_FRAME_COORD(y, x, fy, fx);
- for ( iy = 0; iy < 16; iy++ ) {
- for ( ix = 0; ix < 16; ix++ ) {
- currentBlock[iy][ix] = (int16)current->orig_y[fy+iy][fx+ix];
- }
- }
-
- /* see if we should use motion vectors, and if so, what those
- * vectors should be
- */
- if ( ZeroMotionSufficient(currentBlock, prev, y, x) ) {
- motionX = 0;
- motionY = 0;
- pattern = 63;
- useMotion = TRUE;
- } else {
- useMotion = PMotionSearch(currentBlock, prev, y, x,
- &motionY, &motionX);
-
- pattern = 63;
-
- if ( useMotion ) {
- if ( ZeroMotionBetter(currentBlock, prev, y, x, motionY,
- motionX) ) {
- motionX = 0;
- motionY = 0;
- pattern = 63;
- }
-
- useMotion = (! DoIntraCode(currentBlock, prev, y, x,
- motionY, motionX));
- }
- }
-
- if ( ! useMotion ) {
- /* output I-block inside a P-frame */
- numIBlocks++;
-
- /* calculate forward dct's */
- mp_fwd_dct_block(current->y_blocks[y][x]);
- mp_fwd_dct_block(current->y_blocks[y][x+1]);
- mp_fwd_dct_block(current->y_blocks[y+1][x]);
- mp_fwd_dct_block(current->y_blocks[y+1][x+1]);
- mp_fwd_dct_block(current->cb_blocks[y >> 1][x >> 1]);
- mp_fwd_dct_block(current->cr_blocks[y >> 1][x >> 1]);
-
- GEN_I_BLOCK(P_FRAME, current, bb, mbAddrInc, qscaleP);
- mbAddrInc = 1;
-
- numIBits += (bb->cumulativeBits-totalBits);
- totalBits = bb->cumulativeBits;
-
- /* reset because intra-coded */
- oldMotionX = 0; oldMotionY = 0;
-
- if ( decodeRefFrames ) {
- /* need to decode block we just encoded */
- Mpost_UnQuantZigBlock(fb[0], dec[0], qscaleP, TRUE);
- Mpost_UnQuantZigBlock(fb[1], dec[1], qscaleP, TRUE);
- Mpost_UnQuantZigBlock(fb[2], dec[2], qscaleP, TRUE);
- Mpost_UnQuantZigBlock(fb[3], dec[3], qscaleP, TRUE);
- Mpost_UnQuantZigBlock(fb[4], dec[4], qscaleP, TRUE);
- Mpost_UnQuantZigBlock(fb[5], dec[5], qscaleP, TRUE);
-
- /* now, reverse the DCT transform */
- for ( index = 0; index < 6; index++ ) {
- j_rev_dct((int16 *)dec[index]);
- }
-
- /* now, unblockify */
- BlockToData(current->decoded_y, dec[0], y, x);
- BlockToData(current->decoded_y, dec[1], y, x+1);
- BlockToData(current->decoded_y, dec[2], y+1, x);
- BlockToData(current->decoded_y, dec[3], y+1, x+1);
- BlockToData(current->decoded_cb, dec[4], y>>1, x>>1);
- BlockToData(current->decoded_cr, dec[5], y>>1, x>>1);
- }
- } else {
- /* USE MOTION VECTORS */
- numPBlocks++;
-
- /* reset because non-intra-coded */
- y_dc_pred = cr_dc_pred = cb_dc_pred = 128;
-
- #ifdef BLEAH
- ComputeAndPrintPframeMAD(currentBlock, prev, y, x, motionY, motionX, numBlocks);
- #endif
-
- ComputeDiffDCTs(current, prev, y, x, motionY, motionX,
- pattern);
-
- if ( pixelFullSearch ) { /* should be even */
- motionY /= 2;
- motionX /= 2;
- }
-
- /* transform the motion vector into the appropriate values */
- offsetX = motionX - oldMotionX;
- offsetY = motionY - oldMotionY;
-
- ENCODE_MOTION_VECTOR(offsetX, offsetY, motionXquot,
- motionYquot, motionXrem, motionYrem,
- FORW_F);
-
- #ifdef BLEAH
- if ( (motionX != 0) || (motionY != 0) ) {
- fprintf(stdout, "FRAME (y, x) %d, %d (block %d)\n", y, x, numBlocks);
- fprintf(stdout, "motionX = %d, motionY = %d\n", motionX, motionY);
- fprintf(stdout, " mxq, mxr = %d, %d myq, myr = %d, %d\n",
- motionXquot, motionXrem, motionYquot, motionYrem);
- }
- #endif
-
- oldMotionX = motionX;
- oldMotionY = motionY;
-
- if ( pixelFullSearch ) {/* reset for use with PMotionSearch */
- motionY *= 2;
- motionX *= 2;
- }
-
- /* create flat blocks and update pattern if necessary */
- if ( (pattern & 0x20) &&
- (! Mpost_QuantZigBlock(current->y_blocks[y][x], fba[0],
- qscaleP, FALSE)) ) {
- pattern ^= 0x20;
- }
- if ( (pattern & 0x10) &&
- (! Mpost_QuantZigBlock(current->y_blocks[y][x+1], fba[1],
- qscaleP, FALSE)) ) {
- pattern ^= 0x10;
- }
- if ( (pattern & 0x8) &&
- (! Mpost_QuantZigBlock(current->y_blocks[y+1][x], fba[2],
- qscaleP, FALSE)) ) {
- pattern ^= 0x8;
- }
- if ( (pattern & 0x4) &&
- (! Mpost_QuantZigBlock(current->y_blocks[y+1][x+1], fba[3],
- qscaleP, FALSE)) ) {
- pattern ^= 0x4;
- }
- if ( (pattern & 0x2) &&
- (! Mpost_QuantZigBlock(current->cb_blocks[y >> 1][x >> 1], fba[4],
- qscaleP, FALSE)) ) {
- pattern ^= 0x2;
- }
- if ( (pattern & 0x1) &&
- (! Mpost_QuantZigBlock(current->cr_blocks[y >> 1][x >> 1], fba[5],
- qscaleP, FALSE)) ) {
- pattern ^= 0x1;
- }
-
- if ( decodeRefFrames ) {
- if ( pattern & 0x20 ) {
- Mpost_UnQuantZigBlock(fba[0], dec[0], qscaleP, FALSE);
- } else {
- bzero((char *)dec[0], sizeof(Block));
- }
- if ( pattern & 0x10 ) {
- Mpost_UnQuantZigBlock(fba[1], dec[1], qscaleP, FALSE);
- } else {
- bzero((char *)dec[1], sizeof(Block));
- }
- if ( pattern & 0x8 ) {
- Mpost_UnQuantZigBlock(fba[2], dec[2], qscaleP, FALSE);
- } else {
- bzero((char *)dec[2], sizeof(Block));
- }
- if ( pattern & 0x4 ) {
- Mpost_UnQuantZigBlock(fba[3], dec[3], qscaleP, FALSE);
- } else {
- bzero((char *)dec[3], sizeof(Block));
- }
- if ( pattern & 0x2 ) {
- Mpost_UnQuantZigBlock(fba[4], dec[4], qscaleP, FALSE);
- } else {
- bzero((char *)dec[4], sizeof(Block));
- }
- if ( pattern & 0x1 ) {
- Mpost_UnQuantZigBlock(fba[5], dec[5], qscaleP, FALSE);
- } else {
- bzero((char *)dec[5], sizeof(Block));
- }
-
- /* now, reverse the DCT transform */
- for ( index = 0; index < 6; index++ ) {
- if ( GET_ITH_BIT(pattern, 5-index) ) {
- j_rev_dct((int16 *)dec[index]);
- }
- }
-
- /* now add the motion block */
- AddMotionBlock(dec[0], prev->decoded_y, y, x, motionY, motionX);
- AddMotionBlock(dec[1], prev->decoded_y, y, x+1, motionY, motionX);
- AddMotionBlock(dec[2], prev->decoded_y, y+1, x, motionY, motionX);
- AddMotionBlock(dec[3], prev->decoded_y, y+1, x+1, motionY, motionX);
- AddMotionBlock(dec[4], prev->decoded_cb, y>>1, x>>1, motionY/2, motionX/2);
- AddMotionBlock(dec[5], prev->decoded_cr, y>>1, x>>1, motionY/2, motionX/2);
-
- /* now, unblockify */
- BlockToData(current->decoded_y, dec[0], y, x);
- BlockToData(current->decoded_y, dec[1], y, x+1);
- BlockToData(current->decoded_y, dec[2], y+1, x);
- BlockToData(current->decoded_y, dec[3], y+1, x+1);
- BlockToData(current->decoded_cb, dec[4], y>>1, x>>1);
- BlockToData(current->decoded_cr, dec[5], y>>1, x>>1);
- }
-
- if ( (motionX == 0) && (motionY == 0) ) {
- if ( pattern == 0 ) {
- /* can only skip if:
- * 1) not the last block in frame
- * 2) not the last block in slice
- * 3) not the first block in slice
- */
- if ( ((y < lastY) || (x < lastX)) &&
- (slicePos+1 != blocksPerSlice) &&
- (slicePos != 0) ) {
- mbAddrInc++; /* skipped macroblock */
- numSkipped++;
- numPBlocks--;
- } else { /* last macroblock */
- Mhead_GenMBHeader(bb, 2 /* pict_code_type */, mbAddrInc /* addr_incr */,
- 0 /* mb_quant */, 0 /* q_scale */,
- fCode /* forw_f_code */, 1 /* back_f_code */,
- 0 /* horiz_forw_r */, 0 /* vert_forw_r */,
- 0 /* horiz_back_r */, 0 /* vert_back_r */,
- 0 /* motion_forw */, 0 /* m_horiz_forw */,
- 0 /* m_vert_forw */, 0 /* motion_back */,
- 0 /* m_horiz_back */, 0 /* m_vert_back */,
- 1 /* mb_pattern */, 0 /* mb_intra */);
- mbAddrInc = 1;
-
- Bitio_Write(bb, 0x2, 2); /* first coeff */
- Bitio_Write(bb, 0x2, 2); /* end of block */
- }
- } else {
- DBG_PRINT(("MB Header(%d,%d)\n", x, y));
- Mhead_GenMBHeader(bb, 2 /* pict_code_type */, mbAddrInc /* addr_incr */,
- 0 /* mb_quant */, 0 /* q_scale */,
- fCode /* forw_f_code */, 1 /* back_f_code */,
- 0 /* horiz_forw_r */, 0 /* vert_forw_r */,
- 0 /* horiz_back_r */, 0 /* vert_back_r */,
- 0 /* motion_forw */, 0 /* m_horiz_forw */,
- 0 /* m_vert_forw */, 0 /* motion_back */,
- 0 /* m_horiz_back */, 0 /* m_vert_back */,
- pattern /* mb_pattern */, 0 /* mb_intra */);
- mbAddrInc = 1;
- }
- } else {
- DBG_PRINT(("MB Header(%d,%d)\n", x, y));
- Mhead_GenMBHeader(bb, 2 /* pict_code_type */, mbAddrInc /* addr_incr */,
- 0 /* mb_quant */, 0 /* q_scale */,
- fCode /* forw_f_code */, 1 /* back_f_code */,
- motionXrem /* horiz_forw_r */, motionYrem /* vert_forw_r */,
- 0 /* horiz_back_r */, 0 /* vert_back_r */,
- 1 /* motion_forw */, motionXquot /* m_horiz_forw */,
- motionYquot /* m_vert_forw */, 0 /* motion_back */,
- 0 /* m_horiz_back */, 0 /* m_vert_back */,
- pattern /* mb_pattern */, 0 /* mb_intra */);
- mbAddrInc = 1;
- }
-
- /* now output the difference */
- for ( tempX = 0; tempX < 6; tempX++ ) {
- if ( GET_ITH_BIT(pattern, 5-tempX) ) {
- Mpost_RLEHuffPBlock(fba[tempX], bb);
- }
- }
-
- numPBits += (bb->cumulativeBits-totalBits);
- totalBits = bb->cumulativeBits;
- }
- }
- }
-
- if ( printSNR ) {
- ComputeSNR(current->orig_y, current->decoded_y, Fsize_y, Fsize_x,
- &snr[0], &psnr[0]);
- ComputeSNR(current->orig_cb, current->decoded_cb, Fsize_y/2, Fsize_x/2,
- &snr[1], &psnr[1]);
- ComputeSNR(current->orig_cr, current->decoded_cr, Fsize_y/2, Fsize_x/2,
- &snr[2], &psnr[2]);
-
- totalSNR += snr[0];
- totalPSNR += psnr[0];
- }
-
- Mhead_GenSliceEnder(bb);
-
- /* UPDATE STATISTICS */
- times(&timeBuffer);
- endTime = timeBuffer.tms_utime + timeBuffer.tms_stime;
- totalTime += (endTime-startTime);
-
- if ( (! childProcess) && frameSummary ) {
- fprintf(stdout, "FRAME %d (P): I BLOCKS: %d; P BLOCKS: %d SKIPPED: %d (%ld seconds)\n",
- current->id, numIBlocks, numPBlocks, numSkipped, (long)(endTime-startTime)/60);
- if ( printSNR ) {
- fprintf(stdout, "FRAME %d: SNR: %.1f\t%.1f\t%.1f\tPSNR: %.1f\t%.1f\t%.1f\n",
- current->id, snr[0], snr[1], snr[2],
- psnr[0], psnr[1], psnr[2]);
- }
- }
-
- numFrameBits += (bb->cumulativeBits-totalFrameBits);
- numPIBlocks += numIBlocks;
- numPPBlocks += numPBlocks;
- numPSkipped += numSkipped;
- numPIBits += numIBits;
- numPPBits += numPBits;
-
- if ( (referenceFrame == DECODED_FRAME) && NonLocalRefFrame(current->id) ) {
- if ( remoteIO ) {
- SendDecodedFrame(current);
- } else {
- WriteDecodedFrame(current);
- }
-
- NotifyDecodeServerReady(current->id);
- }
- }
-
-
- /*===========================================================================*
- *
- * ResetPFrameStats
- *
- * reset the P-frame statistics
- *
- * RETURNS: nothing
- *
- * SIDE EFFECTS: none
- *
- *===========================================================================*/
- void
- ResetPFrameStats()
- {
- numPIBlocks = 0;
- numPPBlocks = 0;
- numPSkipped = 0;
- numPIBits = 0;
- numPPBits = 0;
- numFrames = 0;
- numFrameBits = 0;
- totalTime = 0;
- }
-
-
- /*===========================================================================*
- *
- * SetPQScale
- *
- * set the P-frame Q-scale
- *
- * RETURNS: nothing
- *
- * SIDE EFFECTS: qscaleP
- *
- *===========================================================================*/
- void
- SetPQScale(qP)
- int qP;
- {
- qscaleP = qP;
- }
-
-
- /*===========================================================================*
- *
- * GetPQScale
- *
- * return the P-frame Q-scale
- *
- * RETURNS: the P-frame Q-scale
- *
- * SIDE EFFECTS: none
- *
- *===========================================================================*/
- int
- GetPQScale()
- {
- return qscaleP;
- }
-
-
- /*===========================================================================*
- *
- * ShowPFrameSummary
- *
- * print a summary of information on encoding P-frames
- *
- * RETURNS: nothing
- *
- * SIDE EFFECTS: none
- *
- *===========================================================================*/
- void
- ShowPFrameSummary(inputFrameBits, totalBits, fpointer)
- int inputFrameBits;
- int32 totalBits;
- FILE *fpointer;
- {
- if ( numFrames == 0 ) {
- return;
- }
-
- fprintf(fpointer, "-------------------------\n");
- fprintf(fpointer, "*****P FRAME SUMMARY*****\n");
- fprintf(fpointer, "-------------------------\n");
-
- if ( numPIBlocks != 0 ) {
- fprintf(fpointer, " I Blocks: %5d (%6d bits) (%5d bpb)\n",
- numPIBlocks, numPIBits, numPIBits/numPIBlocks);
- } else {
- fprintf(fpointer, " I Blocks: %5d\n", 0);
- }
-
- if ( numPPBlocks != 0 ) {
- fprintf(fpointer, " P Blocks: %5d (%6d bits) (%5d bpb)\n",
- numPPBlocks, numPPBits, numPPBits/numPPBlocks);
- } else {
- fprintf(fpointer, " P Blocks: %5d\n", 0);
- }
-
- fprintf(fpointer, " Skipped: %5d\n", numPSkipped);
-
- fprintf(fpointer, " Frames: %5d (%6d bits) (%5d bpf) (%2.1f%% of total)\n",
- numFrames, numFrameBits, numFrameBits/numFrames,
- 100.0*(float)numFrameBits/(float)totalBits);
- fprintf(fpointer, " Compression: %3d:1\n",
- numFrames*inputFrameBits/numFrameBits);
- if ( printSNR )
- fprintf(fpointer, " Avg Y SNR/PSNR: %.1f %.1f\n",
- totalSNR/(float)numFrames, totalPSNR/(float)numFrames);
- fprintf(fpointer, " Seconds: %9ld (%9ld spf) (%9ld bps)\n",
- (long)(totalTime/60), (long)(totalTime/(60*numFrames)),
- (long)(60.0*(float)numFrames*(float)inputFrameBits/(float)totalTime));
- }
-
-
- /*===========================================================================*
- *
- * EstimateSecondsPerPFrame
- *
- * compute an estimate of the number of seconds required per P-frame
- *
- * RETURNS: the estimate, in seconds
- *
- * SIDE EFFECTS: none
- *
- *===========================================================================*/
- float
- EstimateSecondsPerPFrame()
- {
- if ( numFrames == 0 ) {
- return 10.0;
- } else {
- return (float)totalTime/(60.0*(float)numFrames);
- }
- }
-
-
- /*===========================================================================*
- *
- * ComputeHalfPixelData
- *
- * compute all half-pixel data required for half-pixel motion vector
- * search (luminance only)
- *
- * RETURNS: frame->halfX, ->halfY, and ->halfBoth modified
- *
- * SIDE EFFECTS: none
- *
- *===========================================================================*/
- void
- ComputeHalfPixelData(frame)
- MpegFrame *frame;
- {
- register int x, y;
-
- /* we add 1 before dividing by 2 because .5 is supposed to be rounded up
- * (see MPEG-1, page D-31)
- */
-
- if ( frame->halfX == NULL ) { /* need to allocate memory */
- Frame_AllocHalf(frame);
- }
-
- /* compute halfX */
- for ( y = 0; y < Fsize_y; y++ ) {
- for ( x = 0; x < Fsize_x-1; x++ ) {
- frame->halfX[y][x] = (frame->ref_y[y][x]+
- frame->ref_y[y][x+1]+1)/2;
- }
- }
-
- /* compute halfY */
- for ( y = 0; y < Fsize_y-1; y++ ) {
- for ( x = 0; x < Fsize_x; x++ ) {
- frame->halfY[y][x] = (frame->ref_y[y][x]+
- frame->ref_y[y+1][x]+1)/2;
- }
- }
-
- /* compute halfBoth */
- for ( y = 0; y < Fsize_y-1; y++ ) {
- for ( x = 0; x < Fsize_x-1; x++ ) {
- frame->halfBoth[y][x] = (frame->ref_y[y][x]+
- frame->ref_y[y][x+1]+
- frame->ref_y[y+1][x]+
- frame->ref_y[y+1][x+1]+2)/4;
- }
- }
-
- frame->halfComputed = TRUE;
- }
-
-
- /*=====================*
- * INTERNAL PROCEDURES *
- *=====================*/
-
- /*===========================================================================*
- *
- * USER-MODIFIABLE
- *
- * ZeroMotionBetter
- *
- * decide if (0,0) motion is better than the given motion vector
- *
- * RETURNS: TRUE if (0,0) is better, FALSE if (my,mx) is better
- *
- * SIDE EFFECTS: none
- *
- * PRECONDITIONS: The relevant block in 'current' is valid (it has not
- * been dct'd). 'zeroDiff' has already been computed
- * as the LumMotionError() with (0,0) motion
- *
- * NOTES: This procedure follows the algorithm described on
- * page D-48 of the MPEG-1 specification
- *
- *===========================================================================*/
- static boolean
- ZeroMotionBetter(currentBlock, prev, by, bx, my, mx)
- LumBlock currentBlock;
- MpegFrame *prev;
- int by;
- int bx;
- int my;
- int mx;
- {
- int bestDiff;
-
- bestDiff = LumMotionError(currentBlock, prev, by, bx, my, mx, 0x7fffffff);
-
- if ( zeroDiff < 256*3 ) {
- if ( 2*bestDiff >= zeroDiff ) {
- return TRUE;
- }
- } else {
- if ( 11*bestDiff >= 10*zeroDiff ) {
- return TRUE;
- }
- }
-
- return FALSE;
- }
-
-
- /*===========================================================================*
- *
- * USER-MODIFIABLE
- *
- * DoIntraCode
- *
- * decide if intra coding is necessary
- *
- * RETURNS: TRUE if intra-block coding is better; FALSE if not
- *
- * SIDE EFFECTS: none
- *
- * PRECONDITIONS: The relevant block in 'current' is valid (it has not
- * been dct'd).
- *
- * NOTES: This procedure follows the algorithm described on
- * page D-49 of the MPEG-1 specification
- *
- *===========================================================================*/
- static boolean
- DoIntraCode(currentBlock, prev, by, bx, motionY, motionX)
- LumBlock currentBlock;
- MpegFrame *prev;
- int by;
- int bx;
- int motionY;
- int motionX;
- {
- int x, y;
- int32 sum = 0, vard = 0, varc = 0, dif;
- int32 currPixel, prevPixel;
- LumBlock motionBlock;
- int fy, fx;
-
- ComputeMotionLumBlock(prev, by, bx, motionY, motionX, motionBlock);
-
- MOTION_TO_FRAME_COORD(by, bx, 0, 0, fy, fx);
-
- for ( y = 0; y < 16; y++ ) {
- for ( x = 0; x < 16; x++ ) {
- currPixel = currentBlock[y][x];
- prevPixel = motionBlock[y][x];
-
- sum += currPixel;
- varc += currPixel*currPixel;
-
- dif = currPixel - prevPixel;
- vard += dif*dif;
- }
- }
-
- vard /= 256; /* assumes mean is close to zero */
- varc = varc/256 - (sum/256)*(sum/256);
-
- if ( vard <= 64 ) {
- return FALSE;
- } else if ( vard < varc ) {
- return FALSE;
- } else {
- return TRUE;
- }
- }
-
-
- /*===========================================================================*
- *
- * USER-MODIFIABLE
- *
- * ZeroMotionSufficient
- *
- * decide if zero motion is sufficient without DCT correction
- *
- * RETURNS: TRUE no DCT required; FALSE otherwise
- *
- * SIDE EFFECTS: none
- *
- * PRECONDITIONS: The relevant block in 'current' is raw YCC data
- *
- *===========================================================================*/
- static boolean
- ZeroMotionSufficient(currentBlock, prev, by, bx)
- LumBlock currentBlock;
- MpegFrame *prev;
- int by;
- int bx;
- {
- LumBlock motionBlock;
- register int fy, fx;
- register int x, y;
-
- fy = by*DCTSIZE;
- fx = bx*DCTSIZE;
- for ( y = 0; y < 16; y++ ) {
- for ( x = 0; x < 16; x++ ) {
- motionBlock[y][x] = prev->ref_y[fy+y][fx+x];
- }
- }
-
- zeroDiff = LumBlockMAD(currentBlock, motionBlock, 0x7fffffff);
-
- return (zeroDiff <= 256);
- }
-
-
- #ifdef UNUSED_PROCEDURES
- static void
- ComputeAndPrintPframeMAD(currentBlock, prev, by, bx, my, mbx, numBlock)
- LumBlock currentBlock;
- MpegFrame *prev;
- int by;
- int bx;
- int my;
- int mx;
- int numBlock;
- {
- LumBlock lumMotionBlock;
- int32 mad;
-
- ComputeMotionLumBlock(prev, by, bx, my, mx, lumMotionBlock);
-
- mad = LumBlockMAD(currentBlock, lumMotionBlock, 0x7fffffff);
-
- fprintf(stdout, "%d %d\n", numBlock, mad);
- }
- #endif
-