diff options
Diffstat (limited to 'converter/ppm/ppmtompeg/rate.c')
| -rw-r--r-- | converter/ppm/ppmtompeg/rate.c | 116 |
1 files changed, 61 insertions, 55 deletions
diff --git a/converter/ppm/ppmtompeg/rate.c b/converter/ppm/ppmtompeg/rate.c index 3fa41102..4237427e 100644 --- a/converter/ppm/ppmtompeg/rate.c +++ b/converter/ppm/ppmtompeg/rate.c @@ -1,9 +1,9 @@ /*============================================================================* - * rate.c * - * * - * Procedures concerned with rate control * - * * - * EXPORTED PROCEDURES: * + * rate.c * + * * + * Procedures concerned with rate control * + * * + * EXPORTED PROCEDURES: * * initRatecontrol() * * targetRateControl() * * updateRateControl() * @@ -11,7 +11,7 @@ * needQScaleChange() * * incNumBlocks() * * incQuant() * - * incMacroBlockBits() * + * incMacroBlockBits() * * setPictureRate() * * setBitRate() * * getBitRate() * @@ -19,7 +19,7 @@ * getBufferSize() * * * * NOTES: * - * Naming conventions follow those of MPEG-2 draft algorithm (chap. 10) * + * Naming conventions follow those of MPEG-2 draft algorithm (chap. 10) * *============================================================================*/ @@ -73,7 +73,7 @@ * GLOBAL VARIABLES * *==================*/ -#define MAX_BIT_RATE 104857600 /* 18 digit number in units of 400 */ +#define MAX_BIT_RATE 104857600 /* 18 digit number in units of 400 */ #define MAX_BUFFER_SIZE 16760832 /* 10 digit number in units of 16k */ #define DEFAULT_BUFFER_SIZE 327680 /* maximum for "constrained" bitstream */ #define DEFAULT_VBV_FULLNESS 3 /* wait till 1/3 full */ @@ -82,9 +82,9 @@ #define MAX_VBV_DELAY 32768 /* 16 digits */ -/* Variables from Parameter File */ +/* Variables from Parameter File */ -static int RateControlMode = VARIABLE_RATE; +static int RateControlMode = VARIABLE_RATE; static int32 buffer_size = DEFAULT_BUFFER_SIZE; static int32 bit_rate = -1; @@ -94,9 +94,9 @@ static bool wantVbvOverflowWarning; /* Variables for the VBV buffer defined in MPEG specs */ static unsigned int VBV_remainingDelay; /* delay in units of 1/90000 seconds */ -static int32 VBV_buffer = 0; /* fullness of the theoretical VBV buffer */ +static int32 VBV_buffer = 0; /* fullness of the theoretical VBV buffer */ static int32 bufferFillRate = 0; /* constant rate at which buffer filled */ -static int32 frameDelayIncrement = 0; /* number of "delay" units/Frame */ +static int32 frameDelayIncrement = 0; /* number of "delay" units/Frame */ /* Global complexity measure variables */ static int Xi, Xp, Xb; /* Global complexity measure */ @@ -108,7 +108,7 @@ static float Qi, Qp, Qb; /* avg quantizaton for last picture of type */ /* Target bit allocations for each type of picture*/ int Ti, Tp, Tb; -int current_Tx; /* allocation for current frame */ +int current_Tx; /* allocation for current frame */ /* Count of number of pictures of each type remaining */ int GOP_X; @@ -131,7 +131,7 @@ int rc_totalFrameBits; int rc_totalOverheadBits = 0; -/* Want to print out Macroblock info every Nth MB */ +/* Want to print out Macroblock info every Nth MB */ int RC_MB_SAMPLE_RATE = 0; static float Ki = .7; @@ -150,23 +150,23 @@ static int d0_b; static int lastFrameVirtBuf; /* fullness after last frame of this type */ static int currentVirtBuf; /* fullness during current encoding*/ -static int MB_cnt = -1; /* Number of MB's in picture */ +static int MB_cnt = -1; /* Number of MB's in picture */ static int rc_Q; /* reference quantization parameter */ static int reactionParameter; /* Reaction parameter */ -/* Adaptive Quantization variables */ +/* Adaptive Quantization variables */ static int act_j; /* spatial activity measure */ static float N_act; /* Normalized spacial activity */ -static int avg_act; /* average activity value in last picture encoded */ -static int total_act_j; /* Sum of activity values in current frame */ +static int avg_act; /* average activity value in last picture encoded */ +static int total_act_j; /* Sum of activity values in current frame */ -static int var_sblk; /* sub-block activity */ -static int P_mean; /* Mean value of pixels in 8x8 sub-block */ +static int var_sblk; /* sub-block activity */ +static int P_mean; /* Mean value of pixels in 8x8 sub-block */ -static int mquant; /* Raw Quantization value */ -static int Qscale; /* Clipped, truncated quantization value */ +static int mquant; /* Raw Quantization value */ +static int Qscale; /* Clipped, truncated quantization value */ @@ -177,7 +177,7 @@ static FILE *RC_FILE; static char rc_buffer[101]; -/* EXTERNAL Variables */ +/* EXTERNAL Variables */ extern char *framePattern; extern int framePatternLen; @@ -230,9 +230,9 @@ analyzePattern(const char * const framePattern, * * initRateControl * - * initialize the allocation parameters. + * initialize the allocation parameters. * - * RETURNS: nothing + * RETURNS: nothing * * SIDE EFFECTS: many global variables * @@ -292,11 +292,11 @@ initRateControl(bool const wantUnderflowWarning, d0_p = (Kp * d0_i); d0_b = (Kb * d0_i); - lastFrameVirtBuf = d0_i; /* start with I Frame */ + lastFrameVirtBuf = d0_i; /* start with I Frame */ rc_Q = lastFrameVirtBuf * 31 / reactionParameter; /* init spatial activity measures */ - avg_act = 400; /* Suggested initial value */ + avg_act = 400; /* Suggested initial value */ N_act = 1; mquant = rc_Q * N_act; @@ -316,14 +316,16 @@ initRateControl(bool const wantUnderflowWarning, return result; } + + /*===========================================================================* * * initGOPRateControl * - * (re)-initialize the RC for the a new Group of Pictures. - * New bit allocation, but carry over complexity measures. + * (re)-initialize the RC for the a new Group of Pictures. + * New bit allocation, but carry over complexity measures. * - * RETURNS: nothing + * RETURNS: nothing * * SIDE EFFECTS: many global variables * @@ -464,7 +466,6 @@ targetRateControl(MpegFrame * const frame) { - static void updateVBVBuffer(int const frameBits) { /*---------------------------------------------------------------------------- @@ -580,14 +581,15 @@ updateRateControl(int const type) { } + /*===========================================================================* * * MB_RateOut * * Prints out sampling of MB rate control data. Every "nth" block - * stats are printed, with "n" controlled by global RC_MB_SAMPLE_RATE - * (NB. "skipped" blocks do not go through this function and thus do not - * show up in the sample ) + * stats are printed, with "n" controlled by global RC_MB_SAMPLE_RATE + * (NB. "skipped" blocks do not go through this function and thus do not + * show up in the sample ) * * RETURNS: nothing * @@ -612,8 +614,8 @@ int type; pctUsed = (totalBits *100/current_Tx); sprintf(rc_buffer, "%3d %5d %2d %3d %6d %3d %6d %2.2f %6d %4d %3d %3d\n", - (rc_numBlocks - 1), bitsThisMB, Qscale, mquant, currentVirtBuf, - rc_Q, act_j, N_act, totalBits, bitsPerMB, pctUsed, pctDone); + (rc_numBlocks - 1), bitsThisMB, Qscale, mquant, currentVirtBuf, + rc_Q, act_j, N_act, totalBits, bitsPerMB, pctUsed, pctDone); #ifdef RC_STATS_FILE fprintf(RC_FILE, "%s", rc_buffer); fflush(RC_FILE); @@ -647,11 +649,12 @@ void incNumBlocks(num) } + /*===========================================================================* * * incMacroBlockBits() * - * Increments the number of Macro Block bits and the total of Frame + * Increments the number of Macro Block bits and the total of Frame * bits by the number passed. * * RETURNS: nothing @@ -670,9 +673,10 @@ void incMacroBlockBits(num) } + /*===========================================================================* * - * needQScaleChange(current Q scale, 4 luminance blocks) + * needQScaleChange(current Q scale, 4 luminance blocks) * * * RETURNS: new Qscale @@ -689,7 +693,7 @@ int needQScaleChange(oldQScale, blk0, blk1, blk2, blk3) { /* One more MacroBlock seen */ - rc_numBlocks++; /* this notes each block num in MB */ + rc_numBlocks++; /* this notes each block num in MB */ checkBufferFullness(oldQScale); @@ -707,12 +711,13 @@ int needQScaleChange(oldQScale, blk0, blk1, blk2, blk3) } + /*===========================================================================* * * determineMBCount() * * Determines number of Macro Blocks in frame from the frame sizes - * passed. + * passed. * * RETURNS: nothing * @@ -761,12 +766,13 @@ void checkBufferFullness (oldQScale) } + /*===========================================================================* * * void checkSpatialActivity() * * Calculates the spatial activity for the four luminance blocks of the - * macroblock. Along with the normalized reference quantization parameter + * macroblock. Along with the normalized reference quantization parameter * (rc_Q) , it determines the quantization factor for the next macroblock. * * RETURNS: nothing @@ -796,18 +802,18 @@ void checkSpatialActivity(blk0, blk1, blk2, blk3) blkArray[3] = (int16 *) blk3; - for (i =0; i < 4; i++) { /* Compute the activity in each block */ + for (i =0; i < 4; i++) { /* Compute the activity in each block */ curBlock = blkArray[i]; blk_ptr = curBlock; P_mean = 0; /* Find the mean pixel value */ for (j=0; j < DCTSIZE_SQ; j ++) { P_mean += *(blk_ptr++); - /* P_mean += curBlock[j]; - if (curBlock[j] != *(blk_ptr++)) { - printf("ARRAY ERROR: block %d\n", j); - } - */ + /* P_mean += curBlock[j]; + if (curBlock[j] != *(blk_ptr++)) { + printf("ARRAY ERROR: block %d\n", j); + } + */ } P_mean /= DCTSIZE_SQ; @@ -818,7 +824,7 @@ void checkSpatialActivity(blk0, blk1, blk2, blk3) for (j=0; j < DCTSIZE_SQ; j++) { #ifdef notdef if (curBlock[j] != *(blk_ptr++)) { - printf("ARRAY ERROR: block %d\n", j); + printf("ARRAY ERROR: block %d\n", j); } temp = curBlock[j] - P_mean; #endif @@ -845,7 +851,6 @@ void checkSpatialActivity(blk0, blk1, blk2, blk3) - /*============================================================================* * * getRateMode () @@ -864,19 +869,20 @@ int getRateMode() } + /*===========================================================================* * * setBitRate () * * Checks the string parsed from the parameter file. Verifies * number and sets global values. MPEG standard specifies that bit rate - * be rounded up to nearest 400 bits/sec. + * be rounded up to nearest 400 bits/sec. * * RETURNS: nothing * * SIDE EFFECTS: global variables * - * NOTES: Should this be in the 400-bit units used in sequence header? + * NOTES: Should this be in the 400-bit units used in sequence header? * *===========================================================================*/ void setBitRate (const char * const charPtr) @@ -888,7 +894,7 @@ void setBitRate (const char * const charPtr) RateControlMode = FIXED_RATE; } else { printf("Parameter File Error: invalid BIT_RATE: \"%s\", defaults to Variable ratemode\n", - charPtr); + charPtr); RateControlMode = VARIABLE_RATE; bit_rate = -1; } @@ -921,7 +927,6 @@ int getBitRate () - /*===========================================================================* * * setBufferSize () @@ -933,7 +938,7 @@ int getBitRate () * * SIDE EFFECTS: buffer_size global variable. * - * NOTES: The global is in bits, NOT the 16kb units used in sequence header + * NOTES: The global is in bits, NOT the 16kb units used in sequence header * *===========================================================================*/ void setBufferSize (const char * const charPtr) @@ -948,12 +953,13 @@ void setBufferSize (const char * const charPtr) } else { buffer_size = DEFAULT_BUFFER_SIZE; printf("Parameter File Error: invalid BUFFER_SIZE: \"%s\", defaults to : %d\n", - charPtr, buffer_size); + charPtr, buffer_size); } DBG_PRINT(("Buffer size is: %d\n", buffer_size)); } + /*===========================================================================* * * getBufferSize () |