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xvid_vbr.c
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xvid_vbr.c
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/******************************************************************************
*
* XviD VBR Library
*
* Copyright (C) 2002 Edouard Gomez <[email protected]>
*
* The curve treatment algorithm is based on work done by Foxer <email?> and
* Dirk Knop <[email protected]> for the XviD vfw dynamic library.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*****************************************************************************/
/* Standard Headers */
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <math.h>
/* Local headers */
#include "xvid_vbr.h"
/******************************************************************************
* Build time constants
*****************************************************************************/
/*
* Portability note
* Perhaps the msvc headers define Pi with another constant name
*/
#define DEG2RAD (M_PI / 180.0)
/* Defaults settings will be computed with the help of these constants */
#define DEFAULT_DESIRED_SIZE 700
#define DEFAULT_AUDIO_BITRATE 128
#define DEFAULT_MOVIE_LENGTH 2
#define DEFAULT_TWOPASS_BOOST 1000
#define DEFAULT_FPS 25.0f
#define DEFAULT_CREDITS_SIZE 0
#define DEFAULT_XVID_DBG_FILE "xvid.dbg"
#define DEFAULT_XVID_STATS_FILE "xvid.stats"
/******************************************************************************
* Local prototypes
*****************************************************************************/
/* Sub vbrInit cases functions */
static vbr_init_function vbr_init_dummy;
static vbr_init_function vbr_init_2pass1;
static vbr_init_function vbr_init_2pass2;
static vbr_init_function vbr_init_fixedquant;
/* Sub vbrGetQuant cases functions */
static vbr_get_quant_function vbr_getquant_1pass;
static vbr_get_quant_function vbr_getquant_2pass1;
static vbr_get_quant_function vbr_getquant_2pass2;
static vbr_get_quant_function vbr_getquant_fixedquant;
/* Sub vbrGetIntra cases functions */
static vbr_get_intra_function vbr_getintra_1pass;
static vbr_get_intra_function vbr_getintra_2pass1;
static vbr_get_intra_function vbr_getintra_2pass2;
static vbr_get_intra_function vbr_getintra_fixedquant;
/* Sub vbrUpdate prototypes */
static vbr_update_function vbr_update_dummy;
static vbr_update_function vbr_update_2pass1;
static vbr_update_function vbr_update_2pass2;
/* Sub vbrFinish cases functions */
static vbr_finish_function vbr_finish_dummy;
static vbr_finish_function vbr_finish_2pass1;
static vbr_finish_function vbr_finish_2pass2;
/* Is the encoder in the credits */
#define FRAME_TYPE_NORMAL_MOVIE 0x00
#define FRAME_TYPE_STARTING_CREDITS 0x01
#define FRAME_TYPE_ENDING_CREDITS 0x02
/******************************************************************************
* Inline utility functions
*****************************************************************************/
static __inline int util_frametype(vbr_control_t *state)
{
if(state->credits_start) {
if(state->cur_frame >= state->credits_start_begin &&
state->cur_frame < state->credits_start_end)
return(FRAME_TYPE_STARTING_CREDITS);
}
if(state->credits_end) {
if(state->cur_frame >= state->credits_end_begin &&
state->cur_frame < state->credits_end_end)
return(FRAME_TYPE_ENDING_CREDITS);
}
return(FRAME_TYPE_NORMAL_MOVIE);
}
static __inline int util_creditsframes(vbr_control_t *state)
{
int frames = 0;
if(state->credits_start)
frames += state->credits_start_end - state->credits_start_begin;
if(state->credits_end)
frames += state->credits_end_end - state->credits_end_begin;
return(frames);
}
/******************************************************************************
* Functions
*****************************************************************************/
/*****************************************************************************
* Function description :
*
* This function initialiazes the vbr_control_t with safe defaults for all
* modes.
*
* Return Values :
* = 0
****************************************************************************/
int vbrSetDefaults(vbr_control_t *state)
{
/* Set all the structure to zero */
memset(state, 0, sizeof(state));
/* Default mode is CBR */
state->mode = VBR_MODE_1PASS;
/* Default statistic filename */
state->filename = DEFAULT_XVID_STATS_FILE;
/*
* Default is a 2hour movie on 700Mo CD-ROM + 128kbit sound track
* This represents a target bitrate of 687kbit/s
*/
state->desired_size = DEFAULT_DESIRED_SIZE*1024*1024 -
DEFAULT_MOVIE_LENGTH*3600*DEFAULT_AUDIO_BITRATE*1000/8;
state->desired_bitrate = state->desired_size*8/(DEFAULT_MOVIE_LENGTH*3600);
/* Credits */
state->credits_mode = VBR_CREDITS_MODE_RATE;
state->credits_start = 0;
state->credits_start_begin = 0;
state->credits_start_end = 0;
state->credits_end = 0;
state->credits_end_begin = 0;
state->credits_end_end = 0;
state->credits_quant_ratio = 20;
state->credits_fixed_quant = 20;
state->credits_quant_i = 20;
state->credits_quant_p = 20;
state->credits_start_size = DEFAULT_CREDITS_SIZE*1024*1024;
state->credits_end_size = DEFAULT_CREDITS_SIZE*1024*1024;
/* Keyframe boost */
state->keyframe_boost = 0;
state->kftreshold = 10;
state->kfreduction = 30;
state->min_key_interval = 1;
state->max_key_interval = (int)DEFAULT_FPS*10;
/* Normal curve treatment */
state->curve_compression_high = 25;
state->curve_compression_low = 10;
/* Alt curve */
state->use_alt_curve = 1;
state->alt_curve_type = VBR_ALT_CURVE_LINEAR;
state->alt_curve_low_dist = 90;
state->alt_curve_high_dist = 500;
state->alt_curve_min_rel_qual = 50;
state->alt_curve_use_auto = 1;
state->alt_curve_auto_str = 30;
state->alt_curve_use_auto_bonus_bias = 1;
state->alt_curve_bonus_bias = 50;
state->bitrate_payback_method = VBR_PAYBACK_BIAS;
state->bitrate_payback_delay = 250;
state->twopass_max_bitrate = DEFAULT_TWOPASS_BOOST*state->desired_bitrate;
state->twopass_max_overflow_improvement = 60;
state->twopass_max_overflow_degradation = 60;
state->max_iquant = 31;
state->min_iquant = 2;
state->max_pquant = 31;
state->min_pquant = 2;
state->fixed_quant = 3;
state->max_framesize = (1.0/(float)DEFAULT_FPS) * state->twopass_max_bitrate / 8;
state->fps = (float)DEFAULT_FPS;
return(0);
}
/*****************************************************************************
* Function description :
*
* This function initialiaze the vbr_control_t state passed in parameter.
*
* The initialization depends on state->mode, there are 4 modes allowed.
* Each mode description is done in the README file shipped with the lib.
*
* Return values :
*
* = 0 on success
* = -1 on error
*****************************************************************************/
int vbrInit(vbr_control_t *state)
{
if(state == NULL) return(-1);
/* Function pointers safe initialization */
state->init = NULL;
state->getquant = NULL;
state->getintra = NULL;
state->update = NULL;
state->finish = NULL;
if(state->debug) {
state->debug_file = fopen(DEFAULT_XVID_DBG_FILE, "w+");
if(state->debug_file == NULL)
return(-1);
fprintf(state->debug_file, "# XviD Debug output\n");
fprintf(state->debug_file, "# quant | intra | header bytes"
"| total bytes | kblocks | mblocks | ublocks"
"| vbr overflow | vbr kf overflow"
"| vbr kf partial overflow\n\n");
}
/* Function pointers sub case initialization */
switch(state->mode) {
case VBR_MODE_1PASS:
state->init = vbr_init_dummy;
state->getquant = vbr_getquant_1pass;
state->getintra = vbr_getintra_1pass;
state->update = vbr_update_dummy;
state->finish = vbr_finish_dummy;
break;
case VBR_MODE_2PASS_1:
state->init = vbr_init_2pass1;
state->getquant = vbr_getquant_2pass1;
state->getintra = vbr_getintra_2pass1;
state->update = vbr_update_2pass1;
state->finish = vbr_finish_2pass1;
break;
case VBR_MODE_FIXED_QUANT:
state->init = vbr_init_fixedquant;
state->getquant = vbr_getquant_fixedquant;
state->getintra = vbr_getintra_fixedquant;
state->update = vbr_update_dummy;
state->finish = vbr_finish_dummy;
break;
case VBR_MODE_2PASS_2:
state->init = vbr_init_2pass2;
state->getintra = vbr_getintra_2pass2;
state->getquant = vbr_getquant_2pass2;
state->update = vbr_update_2pass2;
state->finish = vbr_finish_2pass2;
break;
default:
return(-1);
}
return(state->init(state));
}
/******************************************************************************
* Function description :
*
* This function returns an adapted quantizer according to the current vbr
* controler state
*
* Return values :
* the quantizer value (0 <= value <= 31)
* (0 is a special case, means : let XviD decide)
*
*****************************************************************************/
int vbrGetQuant(vbr_control_t *state)
{
/* Returns Zero, so XviD decides alone */
if(state == NULL || state->getquant == NULL) return(0);
return(state->getquant(state));
}
/******************************************************************************
* Function description :
*
* This function returns the type of the frame to be encoded next (I or P/B)
*
* Return values :
* = -1 let the XviD encoder decide wether or not the next frame is I
* = 0 no I frame
* = 1 force keyframe
*
*****************************************************************************/
int vbrGetIntra(vbr_control_t *state)
{
/* Returns -1, means let XviD decide */
if(state == NULL || state->getintra == NULL) return(-1);
return(state->getintra(state));
}
/******************************************************************************
* Function description :
*
* This function updates the vbr control state according to collected statistics
* from XviD core
*
* Return values :
*
* = 0 on success
* = -1 on error
*****************************************************************************/
int vbrUpdate(vbr_control_t *state,
int quant,
int intra,
int header_bytes,
int total_bytes,
int kblocks,
int mblocks,
int ublocks)
{
if(state == NULL || state->update == NULL) return(-1);
if(state->debug && state->debug_file != NULL) {
int idx;
fprintf(state->debug_file, "%d %d %d %d %d %d %d %d %d %d\n",
quant, intra, header_bytes, total_bytes, kblocks,
mblocks, ublocks, state->overflow, state->KFoverflow,
state->KFoverflow_partial);
idx = quant;
if(quant < 1)
idx = 1;
if(quant > 31)
idx = 31;
idx--;
state->debug_quant_count[idx]++;
}
return(state->update(state, quant, intra, header_bytes, total_bytes,
kblocks, mblocks, ublocks));
}
/******************************************************************************
* Function description :
*
* This function stops the vbr controller
*
* Return values :
*
* = 0 on success
* = -1 on error
*****************************************************************************/
int vbrFinish(vbr_control_t *state)
{
if(state == NULL || state->finish == NULL) return(-1);
if(state->debug && state->debug_file != NULL) {
int i;
fprintf(state->debug_file, "\n\n");
for(i=0; i<79; i++)
fprintf(state->debug_file, "#");
fprintf(state->debug_file, "\n# Quantizer distribution :\n\n");
for(i=0;i<32; i++) {
fprintf(state->debug_file, "# quant %d : %d\n",
i+1,
state->debug_quant_count[i]);
}
fclose(state->debug_file);
}
return(state->finish(state));
}
/******************************************************************************
* Dummy functions - Used when a mode does not need such a function
*****************************************************************************/
static int vbr_init_dummy(void *sstate)
{
vbr_control_t *state = sstate;
state->cur_frame = 0;
return(0);
}
static int vbr_update_dummy(void *state,
int quant,
int intra,
int header_bytes,
int total_bytes,
int kblocks,
int mblocks,
int ublocks)
{
((vbr_control_t*)state)->cur_frame++;
return(0);
}
static int vbr_finish_dummy(void *state)
{
return(0);
}
/******************************************************************************
* 1 pass mode - XviD will do its job alone.
*****************************************************************************/
static int vbr_getquant_1pass(void *state)
{
return(0);
}
static int vbr_getintra_1pass(void *state)
{
return(-1);
}
/******************************************************************************
* 2 pass mode - first pass functions
*****************************************************************************/
static int vbr_init_2pass1(void *sstate)
{
FILE *f;
vbr_control_t *state = sstate;
/* Check the filename */
if(state->filename == NULL || state->filename[0] == '\0')
return(-1);
/* Initialize safe defaults for 2pass 1 */
state->pass1_file = NULL;
state->nb_frames = 0;
state->nb_keyframes = 0;
state->cur_frame = 0;
/* Open the 1st pass file */
if((f = fopen(state->filename, "w+")) == NULL)
return(-1);
/*
* The File Header
*
* The extra white spaces will be used during the vbrFinish to write
* the resulting number of frames and keyframes (10 spaces == maximum
* string length of an int on 32bit machines, i don't think anyone is
* encoding more than 4 billion frames :-)
*/
fprintf(f, "# ASCII XviD vbr stat file version %d\n#\n", VBR_VERSION);
fprintf(f, "# frames : \n");
fprintf(f, "# keyframes : \n");
fprintf(f, "#\n# quant | intra | header bytes | total bytes | kblocks |"
" mblocks | ublocks\n\n");
/* Save file pointer */
state->pass1_file = f;
return(0);
}
static int vbr_getquant_2pass1(void *state)
{
return(2);
}
static int vbr_getintra_2pass1(void *state)
{
return(-1);
}
static int vbr_update_2pass1(void *sstate,
int quant,
int intra,
int header_bytes,
int total_bytes,
int kblocks,
int mblocks,
int ublocks)
{
vbr_control_t *state = sstate;
if(state->pass1_file == NULL)
return(-1);
/* Writes the resulting statistics */
fprintf(state->pass1_file, "%d %d %d %d %d %d %d\n",
quant,
intra,
header_bytes,
total_bytes,
kblocks,
mblocks,
ublocks);
/* Update vbr control state */
if(intra) state->nb_keyframes++;
state->nb_frames++;
state->cur_frame++;
return(0);
}
static int vbr_finish_2pass1(void *sstate)
{
int c, i;
vbr_control_t *state = sstate;
if(state->pass1_file == NULL)
return(-1);
/* Goto to the file beginning */
fseek(state->pass1_file, 0, SEEK_SET);
/* Skip the version line and the empty line */
c = i = 0;
do {
c = fgetc(state->pass1_file);
if(c == EOF) return(-1);
if(c == '\n') i++;
}while(i < 2);
/* Prepare to write to the stream */
fseek( state->pass1_file, 0L, SEEK_CUR );
/* Overwrite the frame field - safe as we have written extra spaces */
fprintf(state->pass1_file, "# frames : %.10d\n", state->nb_frames);
/* Overwrite the keyframe field */
fprintf(state->pass1_file, "# keyframes : %.10d\n",
state->nb_keyframes);
/* Close the file */
if(fclose(state->pass1_file) != 0)
return(-1);
return(0);
}
/******************************************************************************
* 2 pass mode - 2nd pass functions (Need to be finished)
*****************************************************************************/
static int vbr_init_2pass2(void *sstate)
{
FILE *f;
int c, n, pos_firstframe, credits_frames;
long long credits1_bytes;
long long credits2_bytes;
long long desired;
long long total_bytes;
long long itotal_bytes;
long long start_curved;
long long end_curved;
double total1;
double total2;
vbr_control_t *state = sstate;
/* Check the filename */
if(state->filename == NULL || state->filename[0] == '\0')
return(-1);
/* Initialize safe defaults for 2pass 2 */
state->pass1_file = NULL;
state->nb_frames = 0;
state->nb_keyframes = 0;
/* Open the 1st pass file */
if((f = fopen(state->filename, "r")) == NULL)
return(-1);
state->pass1_file = f;
/* Get the file version and check against current version */
fscanf(state->pass1_file, "# ASCII XviD vbr stat file version %d\n", &n);
if(n != VBR_VERSION) {
fclose(state->pass1_file);
state->pass1_file = NULL;
return(-1);
}
/* Skip the blank commented line */
c = n = 0;
do {
c = fgetc(state->pass1_file);
if(c == EOF) {
fclose(state->pass1_file);
state->pass1_file = NULL;
return(-1);
}
if(c == '\n') n++;
}while(n < 1);
/* Get the number of frames */
fscanf(state->pass1_file, "# frames : %d\n", &state->nb_frames);
/* Compute the desired size */
state->desired_size = (long long)
(((long long)state->nb_frames * (long long)state->desired_bitrate) /
(state->fps * 8.0));
/* Get the number of keyframes */
fscanf(state->pass1_file, "# keyframes : %d\n", &state->nb_keyframes);
/* Allocate memory space for the keyframe_location array */
if((state->keyframe_locations
= (int*)malloc((state->nb_keyframes+1)*sizeof(int))) == NULL) {
fclose(state->pass1_file);
state->pass1_file = NULL;
return(-1);
}
/* Skip the blank commented line and the colum description */
c = n = 0;
do {
c = fgetc(state->pass1_file);
if(c == EOF) {
fclose(state->pass1_file);
state->pass1_file = NULL;
return(-1);
}
if(c == '\n') n++;
}while(n < 2);
/* Save position for future use */
pos_firstframe = ftell(state->pass1_file);
/* Read and initialize some variables */
credits1_bytes = credits2_bytes = 0;
total_bytes = itotal_bytes = 0;
start_curved = end_curved = 0;
credits_frames = 0;
for(state->cur_frame = c = 0; state->cur_frame<state->nb_frames; state->cur_frame++) {
int quant, keyframe, frame_hbytes, frame_bytes;
int kblocks, mblocks, ublocks;
fscanf(state->pass1_file, "%d %d %d %d %d %d %d\n",
&quant, &keyframe, &frame_hbytes, &frame_bytes,
&kblocks, &mblocks, &ublocks);
/* Is the frame in the beginning credits */
if(util_frametype(state) == FRAME_TYPE_STARTING_CREDITS) {
credits1_bytes += frame_bytes;
credits_frames++;
continue;
}
/* Is the frame in the eding credits */
if(util_frametype(state) == FRAME_TYPE_ENDING_CREDITS) {
credits2_bytes += frame_bytes;
credits_frames++;
continue;
}
/* We only care about Keyframes when not in credits */
if(keyframe) {
itotal_bytes += frame_bytes + frame_bytes *
state->keyframe_boost / 100;
total_bytes += frame_bytes *
state->keyframe_boost / 100;
state->keyframe_locations[c++] = state->cur_frame;
}
total_bytes += frame_bytes;
}
/*
* Last frame is treated like an I Frame so we can dispatch overflow
* all other the last film segment
*/
state->keyframe_locations[c] = state->cur_frame;
desired = state->desired_size;
switch(state->credits_mode) {
case VBR_CREDITS_MODE_QUANT :
state->movie_curve = (double)
(total_bytes - credits1_bytes - credits2_bytes) /
(desired - credits1_bytes - credits2_bytes);
start_curved = credits1_bytes;
end_curved = credits2_bytes;
break;
case VBR_CREDITS_MODE_SIZE:
/* start curve = (start / start desired size) */
state->credits_start_curve = (double)
(credits1_bytes / state->credits_start_size);
/* end curve = (end / end desired size) */
state->credits_end_curve = (double)
(credits2_bytes / state->credits_end_size);
start_curved = (long long)
(credits1_bytes / state->credits_start_curve);
end_curved = (long long)
(credits2_bytes / state->credits_end_curve);
/* movie curve=(total-credits)/(desired_size-curved credits) */
state->movie_curve = (double)
(total_bytes - credits1_bytes - credits2_bytes) /
(desired - start_curved - end_curved);
break;
case VBR_CREDITS_MODE_RATE:
default:
/* credits curve = (total/desired_size)*(100/credits_rate) */
state->credits_start_curve = state->credits_end_curve =
((double)total_bytes / desired) *
((double)100 / state->credits_quant_ratio);
start_curved =
(long long)(credits1_bytes/state->credits_start_curve);
end_curved =
(long long)(credits2_bytes/state->credits_end_curve);
state->movie_curve = (double)
(total_bytes - credits1_bytes - credits2_bytes) /
(desired - start_curved - end_curved);
break;
}
/*
* average frame size = (desired - curved credits - curved keyframes) /
* (frames - credits frames - keyframes)
*/
state->average_frame = (double)
(desired - start_curved - end_curved -
(itotal_bytes / state->movie_curve)) /
(state->nb_frames - util_creditsframes(state) -
state->nb_keyframes);
/* Initialize alt curve parameters */
if (state->use_alt_curve) {
state->alt_curve_low =
state->average_frame - state->average_frame *
(double)(state->alt_curve_low_dist / 100.0);
state->alt_curve_low_diff =
state->average_frame - state->alt_curve_low;
state->alt_curve_high =
state->average_frame + state->average_frame *
(double)(state->alt_curve_high_dist / 100.0);
state->alt_curve_high_diff =
state->alt_curve_high - state->average_frame;
if (state->alt_curve_use_auto) {
if (state->movie_curve > 1.0) {
state->alt_curve_min_rel_qual =
(int)(100.0 - (100.0 - 100.0 / state->movie_curve) *
(double)state->alt_curve_auto_str / 100.0);
if (state->alt_curve_min_rel_qual < 20)
state->alt_curve_min_rel_qual = 20;
}
else {
state->alt_curve_min_rel_qual = 100;
}
}
state->alt_curve_mid_qual =
(1.0 + (double)state->alt_curve_min_rel_qual / 100.0) / 2.0;
state->alt_curve_qual_dev = 1.0 - state->alt_curve_mid_qual;
if (state->alt_curve_low_dist > 100) {
switch(state->alt_curve_type) {
case VBR_ALT_CURVE_AGGRESIVE:
/* Sine Curve (high aggressiveness) */
state->alt_curve_qual_dev *=
2.0 /
(1.0 + sin(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff)));
state->alt_curve_mid_qual =
1.0 - state->alt_curve_qual_dev *
sin(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff));
break;
default:
case VBR_ALT_CURVE_LINEAR:
/* Linear (medium aggressiveness) */
state->alt_curve_qual_dev *=
2.0 /
(1.0 + state->average_frame / state->alt_curve_low_diff);
state->alt_curve_mid_qual =
1.0 - state->alt_curve_qual_dev *
state->average_frame / state->alt_curve_low_diff;
break;
case VBR_ALT_CURVE_SOFT:
/* Cosine Curve (low aggressiveness) */
state->alt_curve_qual_dev *=
2.0 /
(1.0 + (1.0 - cos(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff))));
state->alt_curve_mid_qual =
1.0 - state->alt_curve_qual_dev *
(1.0 - cos(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff)));
break;
}
}
}
/* Go to the first non credits frame stats line into file */
fseek(state->pass1_file, pos_firstframe, SEEK_SET);
/* Perform prepass to compensate for over/undersizing */
total1 = total2 = 0.0;
for(state->cur_frame=0; state->cur_frame<state->nb_frames; state->cur_frame++) {
int quant, keyframe, frame_hbytes, frame_bytes;
int kblocks, mblocks, ublocks;
fscanf(state->pass1_file, "%d %d %d %d %d %d %d\n",
&quant, &keyframe, &frame_hbytes, &frame_bytes,
&kblocks, &mblocks, &ublocks);
if(util_frametype(state) != FRAME_TYPE_NORMAL_MOVIE)
continue;
if(!keyframe) {
double dbytes = frame_bytes / state->movie_curve;
total1 += dbytes;
if (state->use_alt_curve) {
if (dbytes > state->average_frame) {
if (dbytes >= state->alt_curve_high) {
total2 += dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev);
}
else {
switch(state->alt_curve_type) {
case VBR_ALT_CURVE_AGGRESIVE:
total2 +=
dbytes *
(state->alt_curve_mid_qual - state->alt_curve_qual_dev *
sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff)));
break;
default:
case VBR_ALT_CURVE_LINEAR:
total2 +=
dbytes *
(state->alt_curve_mid_qual - state->alt_curve_qual_dev *
(dbytes - state->average_frame) / state->alt_curve_high_diff);
break;
case VBR_ALT_CURVE_SOFT:
total2 +=
dbytes *
(state->alt_curve_mid_qual - state->alt_curve_qual_dev *
(1.0 - cos(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff))));
}
}
}
else {
if (dbytes <= state->alt_curve_low) {
total2 += dbytes;
}
else {
switch(state->alt_curve_type) {
case VBR_ALT_CURVE_AGGRESIVE:
total2 +=
dbytes *
(state->alt_curve_mid_qual - state->alt_curve_qual_dev *
sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_low_diff)));
break;
default:
case VBR_ALT_CURVE_LINEAR:
total2 +=
dbytes *
(state->alt_curve_mid_qual - state->alt_curve_qual_dev *