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bframe.c
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1993-09-27
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1,072 lines
/*===========================================================================*
* bframe.c *
* *
* Procedures concerned with the B-frame encoding *
* *
* EXPORTED PROCEDURES: *
* GenBFrame *
* ResetBFrameStats *
* ShowBFrameSummary *
* EstimateSecondsPerBFrame *
* ComputeBMotionLumBlock *
* SetBQScale *
* GetBQScale *
* *
*===========================================================================*/
/*
* 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/bframe.c,v 1.5 1993/07/30 19:24:04 keving Exp keving $
* $Log: bframe.c,v $
* Revision 1.5 1993/07/30 19:24:04 keving
* nothing
*
* Revision 1.4 1993/07/22 22:23:43 keving
* nothing
*
* Revision 1.3 1993/06/30 20:06:09 keving
* nothing
*
* Revision 1.2 1993/06/03 21:08:08 keving
* nothing
*
* Revision 1.1 1993/02/19 19:14:28 keving
* nothing
*
*/
/*==============*
* HEADER FILES *
*==============*/
#include "all.h"
#include <sys/times.h>
#include "mtypes.h"
#include "bitio.h"
#include "frames.h"
#include "prototypes.h"
#include "fsize.h"
#include "param.h"
#include "mheaders.h"
#include "postdct.h"
/*==================*
* STATIC VARIABLES *
*==================*/
static int numBIBlocks = 0;
static int numBBBlocks = 0;
static int numBSkipped = 0;
static int numBIBits = 0;
static int numBBBits = 0;
static int numFrames = 0;
static int numFrameBits = 0;
static time_t totalTime = 0;
static int qscaleB;
static float totalSNR = 0.0;
static float totalPSNR = 0.0;
/*===============================*
* INTERNAL PROCEDURE prototypes *
*===============================*/
static boolean MotionSufficient _ANSI_ARGS_((LumBlock currBlock, MpegFrame *prev, MpegFrame *next,
int by, int bx, int mode, int fmy, int fmx,
int bmy, int bmx));
static void ComputeBMotionBlock _ANSI_ARGS_((MpegFrame *prev, MpegFrame *next,
int by, int bx, int mode, int fmy, int fmx,
int bmy, int bmx, Block motionBlock, int type));
static void ComputeBDiffDCTs _ANSI_ARGS_((MpegFrame *current, MpegFrame *prev, MpegFrame *next,
int by, int bx, int mode, int fmy, int fmx,
int bmy, int bmx, int pattern));
static boolean DoBIntraCode _ANSI_ARGS_((MpegFrame *current, MpegFrame *prev, MpegFrame *next,
int by, int bx, int mode, int fmy, int fmx, int bmy,
int bmx));
/*=====================*
* EXPORTED PROCEDURES *
*=====================*/
/*===========================================================================*
*
* GenBFrame
*
* generate a B-frame from previous and next frames, adding the result
* to the given bit bucket
*
* RETURNS: frame appended to bb
*
* SIDE EFFECTS: none
*
*===========================================================================*/
void
GenBFrame(bb, curr, prev, next)
BitBucket *bb;
MpegFrame *curr;
MpegFrame *prev;
MpegFrame *next;
{
FlatBlock fba[6], fb[6];
Block dec[6];
int32 y_dc_pred, cr_dc_pred, cb_dc_pred;
int x, y;
int fMotionX = 0, fMotionY = 0;
int bMotionX = 0, bMotionY = 0;
int oldFMotionX = 0, oldFMotionY = 0;
int oldBMotionX = 0, oldBMotionY = 0;
int oldMode = MOTION_FORWARD;
int mode = MOTION_FORWARD;
int offsetX, offsetY;
int tempX, tempY;
int fMotionXrem = 0, fMotionXquot = 0;
int fMotionYrem = 0, fMotionYquot = 0;
int bMotionXrem = 0, bMotionXquot = 0;
int bMotionYrem = 0, bMotionYquot = 0;
int pattern;
int numIBlocks = 0;
int numBBlocks = 0;
int numSkipped = 0;
int numIBits = 0;
int numBBits = 0;
int totalBits;
int mbAddrInc = 1;
boolean lastIntra = TRUE;
int motionForward, motionBackward;
int totalFrameBits;
time_t startTime, endTime;
int lastX, lastY;
int lastBlockX, lastBlockY;
register int ix, iy;
LumBlock currentBlock;
int fy, fx;
boolean result;
int frameBlocks;
int slicePos;
float snr[3], psnr[3];
int index;
numFrames++;
totalFrameBits = bb->cumulativeBits;
time(&startTime);
Mhead_GenPictureHeader(bb, B_FRAME, curr->id, fCode);
Mhead_GenSliceHeader(bb, 1, qscaleB, NULL, 0);
Frame_AllocBlocks(curr);
BlockifyFrame(curr);
if ( printSNR ) {
Frame_AllocDecoded(curr, FALSE);
}
/* for I-blocks */
y_dc_pred = cr_dc_pred = cb_dc_pred = 128;
totalBits = bb->cumulativeBits;
if ( ! pixelFullSearch ) {
if ( ! prev->halfComputed ) {
ComputeHalfPixelData(prev);
}
if ( ! next->halfComputed ) {
ComputeHalfPixelData(next);
}
}
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), qscaleB, NULL, 0);
/* reset everything */
oldFMotionX = 0; oldFMotionY = 0;
oldBMotionX = 0; oldBMotionY = 0;
oldMode = MOTION_FORWARD;
lastIntra = TRUE;
y_dc_pred = cr_dc_pred = cb_dc_pred = 128;
mbAddrInc = 1+(x/2);
}
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)curr->orig_y[fy+iy][fx+ix];
}
}
/* STEP 1: Select Forward, Backward, or Interpolated motion vectors */
/* see if old motion is good enough */
/* but force last block to be non-skipped */
if ( (! lastIntra) && ((y < lastY) || (x < lastX)) ) {
if ( pixelFullSearch ) {
result = MotionSufficient(currentBlock, prev, next, y, x, oldMode,
2*oldFMotionY, 2*oldFMotionX,
2*oldBMotionY, 2*oldBMotionX);
} else {
result = MotionSufficient(currentBlock, prev, next, y, x, oldMode,
oldFMotionY, oldFMotionX,
oldBMotionY, oldBMotionX);
}
} else {
result = FALSE;
}
if ( result ) {
/* skipped macro block */
mbAddrInc++;
numSkipped++;
/* decode skipped block */
if ( printSNR ) {
int fmy, fmx, bmy, bmx;
bzero((char *)dec[0], sizeof(Block));
bzero((char *)dec[1], sizeof(Block));
bzero((char *)dec[2], sizeof(Block));
bzero((char *)dec[3], sizeof(Block));
bzero((char *)dec[4], sizeof(Block));
bzero((char *)dec[5], sizeof(Block));
if ( pixelFullSearch ) {
fmy = 2*oldFMotionY;
fmx = 2*oldFMotionX;
bmy = 2*oldBMotionY;
bmx = 2*oldBMotionX;
} else {
fmy = oldFMotionY;
fmx = oldFMotionX;
bmy = oldBMotionY;
bmx = oldBMotionX;
}
/* now add the motion block */
AddBMotionBlock(dec[0], prev->decoded_y,
next->decoded_y, y, x, mode,
fmy, fmx, bmy, bmx);
AddBMotionBlock(dec[1], prev->decoded_y,
next->decoded_y, y, x+1, mode,
fmy, fmx, bmy, bmx);
AddBMotionBlock(dec[2], prev->decoded_y,
next->decoded_y, y+1, x, mode,
fmy, fmx, bmy, bmx);
AddBMotionBlock(dec[3], prev->decoded_y,
next->decoded_y, y+1, x+1, mode,
fmy, fmx, bmy, bmx);
AddBMotionBlock(dec[4], prev->decoded_cb,
next->decoded_cb, y>>1, x>>1, mode,
fmy/2, fmx/2,
bmy/2, bmx/2);
AddBMotionBlock(dec[5], prev->decoded_cr,
next->decoded_cb, y>>1, x>>1, mode,
fmy/2, fmx/2,
bmy/2, bmx/2);
/* now, unblockify */
BlockToData(curr->decoded_y, dec[0], y, x);
BlockToData(curr->decoded_y, dec[1], y, x+1);
BlockToData(curr->decoded_y, dec[2], y+1, x);
BlockToData(curr->decoded_y, dec[3], y+1, x+1);
BlockToData(curr->decoded_cb, dec[4], y>>1, x>>1);
BlockToData(curr->decoded_cr, dec[5], y>>1, x>>1);
}
} else {
/* do bsearch */
mode = BMotionSearch(currentBlock, prev, next, y, x, &fMotionY,
&fMotionX, &bMotionY, &bMotionX, mode);
pattern = 63;
/* STEP 2: INTRA OR NON-INTRA CODING */
if ( DoBIntraCode(curr, prev, next, y, x, mode, fMotionY,
fMotionX, bMotionY, bMotionX) ) {
/* output I-block inside a P-frame */
numIBlocks++;
/* calculate forward dct's */
mp_fwd_dct_block(curr->y_blocks[y][x]);
mp_fwd_dct_block(curr->y_blocks[y][x+1]);
mp_fwd_dct_block(curr->y_blocks[y+1][x]);
mp_fwd_dct_block(curr->y_blocks[y+1][x+1]);
mp_fwd_dct_block(curr->cb_blocks[y >> 1][x >> 1]);
mp_fwd_dct_block(curr->cr_blocks[y >> 1][x >> 1]);
GEN_I_BLOCK(B_FRAME, curr, bb, mbAddrInc, qscaleB);
mbAddrInc = 1;
numIBits += (bb->cumulativeBits-totalBits);
totalBits = bb->cumulativeBits;
/* reset because intra-coded */
oldFMotionX = 0; oldFMotionY = 0;
oldBMotionX = 0; oldBMotionY = 0;
oldMode = MOTION_FORWARD;
lastIntra = TRUE;
if ( printSNR ) {
/* need to decode block we just encoded */
Mpost_UnQuantZigBlock(fb[0], dec[0], qscaleB, TRUE);
Mpost_UnQuantZigBlock(fb[1], dec[1], qscaleB, TRUE);
Mpost_UnQuantZigBlock(fb[2], dec[2], qscaleB, TRUE);
Mpost_UnQuantZigBlock(fb[3], dec[3], qscaleB, TRUE);
Mpost_UnQuantZigBlock(fb[4], dec[4], qscaleB, TRUE);
Mpost_UnQuantZigBlock(fb[5], dec[5], qscaleB, TRUE);
/* now, reverse the DCT transform */
for ( index = 0; index < 6; index++ ) {
j_rev_dct((int16 *)dec[index]);
}
/* now, unblockify */
BlockToData(curr->decoded_y, dec[0], y, x);
BlockToData(curr->decoded_y, dec[1], y, x+1);
BlockToData(curr->decoded_y, dec[2], y+1, x);
BlockToData(curr->decoded_y, dec[3], y+1, x+1);
BlockToData(curr->decoded_cb, dec[4], y>>1, x>>1);
BlockToData(curr->decoded_cr, dec[5], y>>1, x>>1);
}
} else {
/* STEP 3: CODED OR NOT CODED */
/* make special cases for (0,0) motion???? */
lastIntra = FALSE;
/* USE MOTION VECTORS */
numBBlocks++;
/* reset because non-intra-coded */
y_dc_pred = cr_dc_pred = cb_dc_pred = 128;
ComputeBDiffDCTs(curr, prev, next, y, x, mode, fMotionY,
fMotionX, bMotionY, bMotionX, pattern);
if ( pixelFullSearch ) {
fMotionX /= 2; fMotionY /= 2;
bMotionX /= 2; bMotionY /= 2;
}
/* should really check to see if same motion as previous block, and see if
pattern is 0, then skip it! */
motionForward = ((mode != MOTION_BACKWARD) ? 1 : 0);
motionBackward = ((mode != MOTION_FORWARD) ? 1 : 0);
if ( motionForward ) {
/* transform the fMotion vector into the appropriate values */
offsetX = fMotionX - oldFMotionX;
offsetY = fMotionY - oldFMotionY;
ENCODE_MOTION_VECTOR(offsetX, offsetY, fMotionXquot,
fMotionYquot, fMotionXrem, fMotionYrem,
FORW_F);
oldFMotionX = fMotionX; oldFMotionY = fMotionY;
}
if ( motionBackward ) {
/* transform the bMotion vector into the appropriate values */
offsetX = bMotionX - oldBMotionX;
offsetY = bMotionY - oldBMotionY;
ENCODE_MOTION_VECTOR(offsetX, offsetY, bMotionXquot,
bMotionYquot, bMotionXrem, bMotionYrem,
BACK_F);
oldBMotionX = bMotionX; oldBMotionY = bMotionY;
}
oldMode = mode;
if ( pixelFullSearch ) {
fMotionX *= 2; fMotionY *= 2;
bMotionX *= 2; bMotionY *= 2;
}
/* create flat blocks and update pattern if necessary */
if ( (pattern & 0x20) &&
(! Mpost_QuantZigBlock(curr->y_blocks[y][x], fba[0],
qscaleB, FALSE)) ) {
pattern ^= 0x20;
}
if ( (pattern & 0x10) &&
(! Mpost_QuantZigBlock(curr->y_blocks[y][x+1], fba[1],
qscaleB, FALSE)) ) {
pattern ^= 0x10;
}
if ( (pattern & 0x8) &&
(! Mpost_QuantZigBlock(curr->y_blocks[y+1][x], fba[2],
qscaleB, FALSE)) ) {
pattern ^= 0x8;
}
if ( (pattern & 0x4) &&
(! Mpost_QuantZigBlock(curr->y_blocks[y+1][x+1], fba[3],
qscaleB, FALSE)) ) {
pattern ^= 0x4;
}
if ( (pattern & 0x2) &&
(! Mpost_QuantZigBlock(curr->cb_blocks[y >> 1][x >> 1], fba[4],
qscaleB, FALSE)) ) {
pattern ^= 0x2;
}
if ( (pattern & 0x1) &&
(! Mpost_QuantZigBlock(curr->cr_blocks[y >> 1][x >> 1], fba[5],
qscaleB, FALSE)) ) {
pattern ^= 0x1;
}
if ( printSNR ) {
if ( pattern & 0x20 ) {
Mpost_UnQuantZigBlock(fba[0], dec[0], qscaleB, FALSE);
} else {
bzero((char *)dec[0], sizeof(Block));
}
if ( pattern & 0x10 ) {
Mpost_UnQuantZigBlock(fba[1], dec[1], qscaleB, FALSE);
} else {
bzero((char *)dec[1], sizeof(Block));
}
if ( pattern & 0x8 ) {
Mpost_UnQuantZigBlock(fba[2], dec[2], qscaleB, FALSE);
} else {
bzero((char *)dec[2], sizeof(Block));
}
if ( pattern & 0x4 ) {
Mpost_UnQuantZigBlock(fba[3], dec[3], qscaleB, FALSE);
} else {
bzero((char *)dec[3], sizeof(Block));
}
if ( pattern & 0x2 ) {
Mpost_UnQuantZigBlock(fba[4], dec[4], qscaleB, FALSE);
} else {
bzero((char *)dec[4], sizeof(Block));
}
if ( pattern & 0x1 ) {
Mpost_UnQuantZigBlock(fba[5], dec[5], qscaleB, 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 */
AddBMotionBlock(dec[0], prev->decoded_y,
next->decoded_y, y, x, mode,
fMotionY, fMotionX, bMotionY, bMotionX);
AddBMotionBlock(dec[1], prev->decoded_y,
next->decoded_y, y, x+1, mode,
fMotionY, fMotionX, bMotionY, bMotionX);
AddBMotionBlock(dec[2], prev->decoded_y,
next->decoded_y, y+1, x, mode,
fMotionY, fMotionX, bMotionY, bMotionX);
AddBMotionBlock(dec[3], prev->decoded_y,
next->decoded_y, y+1, x+1, mode,
fMotionY, fMotionX, bMotionY, bMotionX);
AddBMotionBlock(dec[4], prev->decoded_cb,
next->decoded_cb, y>>1, x>>1, mode,
fMotionY/2, fMotionX/2,
bMotionY/2, bMotionX/2);
AddBMotionBlock(dec[5], prev->decoded_cr,
next->decoded_cr, y>>1, x>>1, mode,
fMotionY/2, fMotionX/2,
bMotionY/2, bMotionX/2);
/* now, unblockify */
BlockToData(curr->decoded_y, dec[0], y, x);
BlockToData(curr->decoded_y, dec[1], y, x+1);
BlockToData(curr->decoded_y, dec[2], y+1, x);
BlockToData(curr->decoded_y, dec[3], y+1, x+1);
BlockToData(curr->decoded_cb, dec[4], y>>1, x>>1);
BlockToData(curr->decoded_cr, dec[5], y>>1, x>>1);
}
#ifdef BLEAH
fprintf(stdout, "BFRAME PATTERN = %d...FORW = %d, BACK = %d\n", pattern,
motionForward, motionBackward);
fprintf(stdout, "fMotionX = %d, fMotionY = %d, bMotionX = %d, bMotionY = %d\n",
fMotionX, fMotionY, bMotionX, bMotionY);
#endif
DBG_PRINT(("MB Header(%d,%d)\n", x, y));
Mhead_GenMBHeader(bb, 3 /* pict_code_type */, mbAddrInc /* addr_incr */,
0 /* mb_quant */, 0 /* q_scale */,
fCode /* forw_f_code */, fCode /* back_f_code */,
fMotionXrem /* horiz_forw_r */, fMotionYrem /* vert_forw_r */,
bMotionXrem /* horiz_back_r */, bMotionYrem /* vert_back_r */,
motionForward /* motion_forw */, fMotionXquot /* m_horiz_forw */,
fMotionYquot /* m_vert_forw */, motionBackward /* motion_back */,
bMotionXquot /* m_horiz_back */, bMotionYquot /* 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);
}
}
numBBits += (bb->cumulativeBits-totalBits);
totalBits = bb->cumulativeBits;
}
}
}
}
if ( printSNR ) {
ComputeSNR(curr->orig_y, curr->decoded_y, Fsize_y, Fsize_x,
&snr[0], &psnr[0]);
ComputeSNR(curr->orig_cb, curr->decoded_cb, Fsize_y/2, Fsize_x/2,
&snr[1], &psnr[1]);
ComputeSNR(curr->orig_cr, curr->decoded_cr, Fsize_y/2, Fsize_x/2,
&snr[2], &psnr[2]);
totalSNR += snr[0];
totalPSNR += psnr[0];
}
#ifdef BLEAH
if ( printSNR ) {
FILE *fpointer;
char fileName[256];
int width, height;
/* output the decoded frame */
width = Fsize_x;
height = Fsize_y;
sprintf(fileName, "/tmp/decoded%d.yuv", curr->id);
fprintf(stdout, "outputting to %s\n", fileName);
fpointer = fopen(fileName, "wb");
for ( y = 0; y < height; y++ ) {
fwrite(curr->decoded_y[y], 1, width, fpointer);
}
for (y = 0; y < height / 2; y++) { /* U */
fwrite(curr->decoded_cb[y], 1, width / 2, fpointer);
}
for (y = 0; y < height / 2; y++) { /* V */
fwrite(curr->decoded_cr[y], 1, width / 2, fpointer);
}
fclose(fpointer);
}
#endif
Mhead_GenSliceEnder(bb);
time(&endTime);
totalTime += (endTime-startTime);
if ( (! childProcess) && frameSummary ) {
fprintf(stdout, "FRAME %d (B): I BLOCKS: %d; B BLOCKS: %d SKIPPED: %d (%ld seconds)\n",
curr->id, numIBlocks, numBBlocks, numSkipped, (long)(totalTime));
if ( printSNR )
fprintf(stdout, "FRAME %d: SNR: %.1f\t%.1f\t%.1f\tPSNR: %.1f\t%.1f\t%.1f\n",
curr->id, snr[0], snr[1], snr[2],
psnr[0], psnr[1], psnr[2]);
}
numFrameBits += (bb->cumulativeBits-totalFrameBits);
numBIBlocks += numIBlocks;
numBBBlocks += numBBlocks;
numBSkipped += numSkipped;
numBIBits += numIBits;
numBBBits += numBBits;
}
/*===========================================================================*
*
* SetBQScale
*
* set the B-frame Q-scale
*
* RETURNS: nothing
*
* SIDE EFFECTS: qscaleB
*
*===========================================================================*/
void
SetBQScale(qB)
int qB;
{
qscaleB = qB;
}
/*===========================================================================*
*
* GetBQScale
*
* get the B-frame Q-scale
*
* RETURNS: the Q-scale
*
* SIDE EFFECTS: none
*
*===========================================================================*/
int
GetBQScale()
{
return qscaleB;
}
/*===========================================================================*
*
* ResetBFrameStats
*
* reset the B-frame stats
*
* RETURNS: nothing
*
* SIDE EFFECTS: none
*
*===========================================================================*/
void
ResetBFrameStats()
{
numBIBlocks = 0;
numBBBlocks = 0;
numBSkipped = 0;
numBIBits = 0;
numBBBits = 0;
numFrames = 0;
numFrameBits = 0;
totalTime = 0;
}
/*===========================================================================*
*
* ShowBFrameSummary
*
* print out statistics on all B-frames
*
* RETURNS: nothing
*
* SIDE EFFECTS: none
*
*===========================================================================*/
void
ShowBFrameSummary(inputFrameBits, totalBits, fpointer)
int inputFrameBits;
int32 totalBits;
FILE *fpointer;
{
if ( numFrames == 0 ) {
return;
}
fprintf(fpointer, "-------------------------\n");
fprintf(fpointer, "*****B FRAME SUMMARY*****\n");
fprintf(fpointer, "-------------------------\n");
if ( numBIBlocks != 0 ) {
fprintf(fpointer, " I Blocks: %5d (%6d bits) (%5d bpb)\n",
numBIBlocks, numBIBits, numBIBits/numBIBlocks);
} else {
fprintf(fpointer, " I Blocks: %5d\n", 0);
}
if ( numBBBlocks != 0 ) {
fprintf(fpointer, " B Blocks: %5d (%6d bits) (%5d bpb)\n",
numBBBlocks, numBBBits, numBBBits/numBBBlocks);
} else {
fprintf(fpointer, " B Blocks: %5d\n", 0);
}
fprintf(fpointer, " Skipped: %5d\n", numBSkipped);
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), (long)(totalTime/(numFrames)),
(long)((float)numFrames*(float)inputFrameBits/(float)totalTime));
}
/*===========================================================================*
*
* ComputeBMotionLumBlock
*
* compute the luminance block resulting from motion compensation
*
* RETURNS: motionBlock modified
*
* SIDE EFFECTS: none
*
* PRECONDITION: the motion vectors must be valid!
*
*===========================================================================*/
void
ComputeBMotionLumBlock(prev, next, by, bx, mode, fmy, fmx, bmy, bmx, motionBlock)
MpegFrame *prev;
MpegFrame *next;
int by;
int bx;
int mode;
int fmy;
int fmx;
int bmy;
int bmx;
LumBlock motionBlock;
{
LumBlock prevBlock, nextBlock;
register int y, x;
switch(mode) {
case MOTION_FORWARD:
ComputeMotionLumBlock(prev, by, bx, fmy, fmx, motionBlock);
break;
case MOTION_BACKWARD:
ComputeMotionLumBlock(next, by, bx, bmy, bmx, motionBlock);
break;
case MOTION_INTERPOLATE:
ComputeMotionLumBlock(prev, by, bx, fmy, fmx, prevBlock);
ComputeMotionLumBlock(next, by, bx, bmy, bmx, nextBlock);
for ( y = 0; y < 16; y++ ) {
for ( x = 0; x < 16; x++ ) {
motionBlock[y][x] = (prevBlock[y][x]+nextBlock[y][x]+1)/2;
}
}
break;
}
}
/*===========================================================================*
*
* EstimateSecondsPerBFrame
*
* estimate the seconds to compute a B-frame
*
* RETURNS: the time, in seconds
*
* SIDE EFFECTS: none
*
*===========================================================================*/
float
EstimateSecondsPerBFrame()
{
if ( numFrames == 0 ) {
return 20.0;
} else {
return (float)totalTime/((float)numFrames);
}
}
/*=====================*
* INTERNAL PROCEDURES *
*=====================*/
/*===========================================================================*
*
* ComputeBMotionBlock
*
* compute the block resulting from motion compensation
*
* RETURNS: motionBlock is modified
*
* SIDE EFFECTS: none
*
* PRECONDITION: the motion vectors must be valid!
*
*===========================================================================*/
static void
ComputeBMotionBlock(prev, next, by, bx, mode, fmy, fmx, bmy, bmx, motionBlock, type)
MpegFrame *prev;
MpegFrame *next;
int by;
int bx;
int mode;
int fmy;
int fmx;
int bmy;
int bmx;
Block motionBlock;
int type;
{
Block prevBlock, nextBlock;
register int y, x;
switch(mode) {
case MOTION_FORWARD:
if ( type == LUM_BLOCK ) {
ComputeMotionBlock(prev->ref_y, by, bx, fmy, fmx, motionBlock);
} else if ( type == CB_BLOCK ) {
ComputeMotionBlock(prev->ref_cb, by, bx, fmy, fmx, motionBlock);
} else if ( type == CR_BLOCK ) {
ComputeMotionBlock(prev->ref_cr, by, bx, fmy, fmx, motionBlock);
}
break;
case MOTION_BACKWARD:
if ( type == LUM_BLOCK ) {
ComputeMotionBlock(next->ref_y, by, bx, bmy, bmx, motionBlock);
} else if ( type == CB_BLOCK ) {
ComputeMotionBlock(next->ref_cb, by, bx, bmy, bmx, motionBlock);
} else if ( type == CR_BLOCK ) {
ComputeMotionBlock(next->ref_cr, by, bx, bmy, bmx, motionBlock);
}
break;
case MOTION_INTERPOLATE:
if ( type == LUM_BLOCK ) {
ComputeMotionBlock(prev->ref_y, by, bx, fmy, fmx, prevBlock);
ComputeMotionBlock(next->ref_y, by, bx, bmy, bmx, nextBlock);
} else if ( type == CB_BLOCK ) {
ComputeMotionBlock(prev->ref_cb, by, bx, fmy, fmx, prevBlock);
ComputeMotionBlock(next->ref_cb, by, bx, bmy, bmx, nextBlock);
} else if ( type == CR_BLOCK ) {
ComputeMotionBlock(prev->ref_cr, by, bx, fmy, fmx, prevBlock);
ComputeMotionBlock(next->ref_cr, by, bx, bmy, bmx, nextBlock);
}
for ( y = 0; y < 8; y++ ) {
for ( x = 0; x < 8; x++ ) {
motionBlock[y][x] = (prevBlock[y][x]+nextBlock[y][x]+1)/2;
}
}
break;
}
}
/*===========================================================================*
*
* ComputeBDiffDCTs
*
* compute the DCT of the error term
*
* RETURNS: appropriate blocks of current will contain the DCTs
*
* SIDE EFFECTS: none
*
* PRECONDITION: the motion vectors must be valid!
*
*===========================================================================*/
static void
ComputeBDiffDCTs(current, prev, next, by, bx, mode, fmy, fmx, bmy, bmx, pattern)
MpegFrame *current;
MpegFrame *prev;
MpegFrame *next;
int by;
int bx;
int mode;
int fmy;
int fmx;
int bmy;
int bmx;
int pattern;
{
Block motionBlock;
if ( pattern & 0x20 ) {
ComputeBMotionBlock(prev, next, by, bx, mode, fmy, fmx,
bmy, bmx, motionBlock, LUM_BLOCK);
ComputeDiffDCTBlock(current->y_blocks[by][bx], motionBlock);
}
if ( pattern & 0x10 ) {
ComputeBMotionBlock(prev, next, by, bx+1, mode, fmy, fmx,
bmy, bmx, motionBlock, LUM_BLOCK);
ComputeDiffDCTBlock(current->y_blocks[by][bx+1], motionBlock);
}
if ( pattern & 0x8 ) {
ComputeBMotionBlock(prev, next, by+1, bx, mode, fmy, fmx,
bmy, bmx, motionBlock, LUM_BLOCK);
ComputeDiffDCTBlock(current->y_blocks[by+1][bx], motionBlock);
}
if ( pattern & 0x4 ) {
ComputeBMotionBlock(prev, next, by+1, bx+1, mode, fmy, fmx,
bmy, bmx, motionBlock, LUM_BLOCK);
ComputeDiffDCTBlock(current->y_blocks[by+1][bx+1], motionBlock);
}
if ( pattern & 0x2 ) {
ComputeBMotionBlock(prev, next, by>>1, bx>>1, mode, fmy/2, fmx/2,
bmy/2, bmx/2, motionBlock, CB_BLOCK);
ComputeDiffDCTBlock(current->cb_blocks[by >> 1][bx >> 1], motionBlock);
}
if ( pattern & 0x1 ) {
ComputeBMotionBlock(prev, next, by>>1, bx>>1, mode, fmy/2, fmx/2,
bmy/2, bmx/2, motionBlock, CR_BLOCK);
ComputeDiffDCTBlock(current->cr_blocks[by >> 1][bx >> 1], motionBlock);
}
}
/*===========================================================================*
*
* USER-MODIFIABLE
*
* DoBIntraCode
*
* decides if this block should be coded as intra-block
*
* RETURNS: TRUE if intra-coding should be used; FALSE otherwise
*
* SIDE EFFECTS: none
*
* PRECONDITION: the motion vectors must be valid!
*
*===========================================================================*/
static boolean
DoBIntraCode(current, prev, next, by, bx, mode, fmy, fmx, bmy, bmx)
MpegFrame *current;
MpegFrame *prev;
MpegFrame *next;
int by;
int bx;
int mode;
int fmy;
int fmx;
int bmy;
int bmx;
{
int x, y;
int32 sum = 0, vard = 0, varc = 0, dif;
int32 currPixel, prevPixel;
LumBlock motionBlock;
int fy, fx;
ComputeBMotionLumBlock(prev, next, by, bx, mode, fmy, fmx,
bmy, bmx, motionBlock);
MOTION_TO_FRAME_COORD(by, bx, 0, 0, fy, fx);
for ( y = 0; y < 16; y++ ) {
for ( x = 0; x < 16; x++ ) {
currPixel = current->orig_y[fy+y][fx+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
*
* MotionSufficient
*
* decides if this motion vector is sufficient without DCT coding
*
* RETURNS: TRUE if no DCT is needed; FALSE otherwise
*
* SIDE EFFECTS: none
*
* PRECONDITION: the motion vectors must be valid!
*
*===========================================================================*/
static boolean
MotionSufficient(currBlock, prev, next, by, bx, mode, fmy, fmx, bmy, bmx)
LumBlock currBlock;
MpegFrame *prev;
MpegFrame *next;
int by;
int bx;
int mode;
int fmy;
int fmx;
int bmy;
int bmx;
{
LumBlock motionBlock;
if ( mode != MOTION_BACKWARD ) {
/* check forward motion for bounds */
if ( (by*DCTSIZE+(fmy-1)/2 < 0) || ((by+2)*DCTSIZE+(fmy+1)/2-1 >= Fsize_y) ) {
return FALSE;
}
if ( (bx*DCTSIZE+(fmx-1)/2 < 0) || ((bx+2)*DCTSIZE+(fmx+1)/2-1 >= Fsize_x) ) {
return FALSE;
}
}
if ( mode != MOTION_FORWARD ) {
/* check backward motion for bounds */
if ( (by*DCTSIZE+(bmy-1)/2 < 0) || ((by+2)*DCTSIZE+(bmy+1)/2-1 >= Fsize_y) ) {
return FALSE;
}
if ( (bx*DCTSIZE+(bmx-1)/2 < 0) || ((bx+2)*DCTSIZE+(bmx+1)/2-1 >= Fsize_x) ) {
return FALSE;
}
}
ComputeBMotionLumBlock(prev, next, by, bx, mode, fmy, fmx,
bmy, bmx, motionBlock);
return (LumBlockMAD(currBlock, motionBlock, 0x7fffffff) <= 512);
}