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fixed ratecontrol & b-frames 

2pass ratecontrol
fixed hq with 2pass
inceased build num (a few more vars for the rc stuff)
hopefully no new bugs

Originally committed as revision 408 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Michael Niedermayer 23 years ago
parent
2c029cd19d
commit
8b4c7dbc55
5 changed files with 515 additions and 168 deletions
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  1. +2
    -1
      libavcodec/Makefile
  2. +11
    -4
      libavcodec/avcodec.h
  3. +57
    -156
      libavcodec/mpegvideo.c
  4. +40
    -7
      libavcodec/mpegvideo.h
  5. +405
    -0
      libavcodec/ratecontrol.c

+ 2
- 1
libavcodec/Makefile View File

@@ -6,7 +6,8 @@ LDFLAGS= -g
OBJS= common.o utils.o mpegvideo.o h263.o jrevdct.o jfdctfst.o \
mpegaudio.o ac3enc.o mjpeg.o resample.o dsputil.o \
motion_est.o imgconvert.o imgresample.o msmpeg4.o \
mpeg12.o h263dec.o rv10.o mpegaudiodec.o pcm.o simple_idct.o
mpeg12.o h263dec.o rv10.o mpegaudiodec.o pcm.o simple_idct.o \
ratecontrol.o
ASM_OBJS=

# currently using libac3 for ac3 decoding


+ 11
- 4
libavcodec/avcodec.h View File

@@ -5,8 +5,8 @@

#define LIBAVCODEC_VERSION_INT 0x000406
#define LIBAVCODEC_VERSION "0.4.6"
#define LIBAVCODEC_BUILD 4600
#define LIBAVCODEC_BUILD_STR "4600"
#define LIBAVCODEC_BUILD 4601
#define LIBAVCODEC_BUILD_STR "4601"

enum CodecID {
CODEC_ID_NONE,
@@ -90,7 +90,9 @@ static const int Motion_Est_QTab[] = { 1, 4, 3, 6, 5, 2 };
#define CODEC_FLAG_TYPE 0x0040 /* fixed I/P frame type, from avctx->key_frame */
/* parent program gurantees that the input for b-frame containing streams is not written to
for at least s->max_b_frames+1 frames, if this is not set than the input will be copied */
#define CODEC_FLAG_INPUT_PRESERVED 0x0100
#define CODEC_FLAG_INPUT_PRESERVED 0x0100
#define CODEC_FLAG_PASS1 0x0200 /* use internal 2pass ratecontrol in first pass mode */
#define CODEC_FLAG_PASS2 0x0400 /* use internal 2pass ratecontrol in second pass mode */

/* codec capabilities */

@@ -139,13 +141,18 @@ typedef struct AVCodecContext {
int key_frame; /* true if the previous compressed frame was
a key frame (intra, or seekable) */
int quality; /* quality of the previous encoded frame
(between 1 (good) and 31 (bad)) */
(between 1 (good) and 31 (bad))
this is allso used to set the quality in vbr mode
and the per frame quality in CODEC_FLAG_TYPE (second pass mode) */
float qcompress; /* amount of qscale change between easy & hard scenes (0.0-1.0)*/
float qblur; /* amount of qscale smoothing over time (0.0-1.0) */
int qmin; /* min qscale */
int qmax; /* max qscale */
int max_qdiff; /* max qscale difference between frames */
int max_b_frames; /* maximum b frames, the output will be delayed by max_b_frames+1 relative to the input */
float b_quant_factor;/* qscale factor between ips and b frames */
int rc_strategy;
int b_frame_strategy;

struct AVCodec *codec;
void *priv_data;


+ 57
- 156
libavcodec/mpegvideo.c View File

@@ -31,8 +31,6 @@
#endif

static void encode_picture(MpegEncContext *s, int picture_number);
static void rate_control_init(MpegEncContext *s);
static int rate_estimate_qscale(MpegEncContext *s);
static void dct_unquantize_mpeg1_c(MpegEncContext *s,
DCTELEM *block, int n, int qscale);
static void dct_unquantize_mpeg2_c(MpegEncContext *s,
@@ -377,10 +375,13 @@ int MPV_encode_init(AVCodecContext *avctx)
s->max_qdiff= avctx->max_qdiff;
s->qcompress= avctx->qcompress;
s->qblur= avctx->qblur;
s->b_quant_factor= avctx->b_quant_factor;
s->avctx = avctx;
s->aspect_ratio_info= avctx->aspect_ratio_info;
s->flags= avctx->flags;
s->max_b_frames= avctx->max_b_frames;
s->rc_strategy= avctx->rc_strategy;
s->b_frame_strategy= avctx->b_frame_strategy;
if (s->gop_size <= 1) {
s->intra_only = 1;
@@ -510,8 +511,8 @@ int MPV_encode_init(AVCodecContext *avctx)
s->non_intra_matrix[i] = default_non_intra_matrix[i];
}

/* rate control init */
rate_control_init(s);
if(ff_rate_control_init(s) < 0)
return -1;

s->picture_number = 0;
s->picture_in_gop_number = 0;
@@ -530,6 +531,9 @@ int MPV_encode_end(AVCodecContext *avctx)
#ifdef STATS
print_stats();
#endif

ff_rate_control_uninit(s);

MPV_common_end(s);
if (s->out_format == FMT_MJPEG)
mjpeg_close(s);
@@ -577,7 +581,6 @@ void MPV_frame_start(MpegEncContext *s)
s->current_picture[i] = s->aux_picture[i];
}
} else {
s->last_non_b_pict_type= s->pict_type;
for(i=0;i<3;i++) {
/* swap next and last */
tmp = s->last_picture[i];
@@ -605,6 +608,12 @@ void MPV_frame_end(MpegEncContext *s)
}
}
emms_c();
if(s->pict_type!=B_TYPE){
s->last_non_b_pict_type= s->pict_type;
s->last_non_b_qscale= s->qscale;
s->last_non_b_mc_mb_var= s->mc_mb_var;
}
}

/* reorder input for encoding */
@@ -695,25 +704,34 @@ int MPV_encode_picture(AVCodecContext *avctx,

init_put_bits(&s->pb, buf, buf_size, NULL, NULL);

s->force_input_type= (avctx->flags&CODEC_FLAG_TYPE) ?
(avctx->key_frame ? I_TYPE : P_TYPE) : 0;
if (!s->intra_only) {
/* first picture of GOP is intra */
if (s->input_picture_in_gop_number % s->gop_size==0 || s->force_input_type==I_TYPE){
s->input_picture_in_gop_number=0;
s->input_pict_type = I_TYPE;
}else if(s->max_b_frames==0){
s->input_pict_type = P_TYPE;
}else{
if(s->b_frames_since_non_b < s->max_b_frames) //FIXME more IQ
s->input_pict_type = B_TYPE;
else
if(avctx->flags&CODEC_FLAG_TYPE){
s->input_pict_type=
s->force_input_type= avctx->key_frame ? I_TYPE : P_TYPE;
}else if(s->flags&CODEC_FLAG_PASS2){
s->input_pict_type=
s->force_input_type= s->rc_context.entry[s->input_picture_number].new_pict_type;
}else{
s->force_input_type=0;
if (!s->intra_only) {
/* first picture of GOP is intra */
if (s->input_picture_in_gop_number % s->gop_size==0){
s->input_pict_type = I_TYPE;
}else if(s->max_b_frames==0){
s->input_pict_type = P_TYPE;
}else{
if(s->b_frames_since_non_b < s->max_b_frames) //FIXME more IQ
s->input_pict_type = B_TYPE;
else
s->input_pict_type = P_TYPE;
}
} else {
s->input_pict_type = I_TYPE;
}
} else {
s->input_pict_type = I_TYPE;
}

if(s->input_pict_type==I_TYPE)
s->input_picture_in_gop_number=0;
reorder_input(s, pict);
/* output? */
@@ -745,14 +763,19 @@ int MPV_encode_picture(AVCodecContext *avctx,
mjpeg_picture_trailer(s);

avctx->quality = s->qscale;
if(s->flags&CODEC_FLAG_PASS1)
ff_write_pass1_stats(s);
}

s->input_picture_number++;
s->input_picture_in_gop_number++;

flush_put_bits(&s->pb);
s->last_frame_bits= s->frame_bits;
s->frame_bits = (pbBufPtr(&s->pb) - s->pb.buf) * 8;
if(s->pict_type==B_TYPE) s->pb_frame_bits+= s->frame_bits;
else s->pb_frame_bits= s->frame_bits;

s->total_bits += s->frame_bits;
avctx->frame_bits = s->frame_bits;
//printf("fcode: %d, type: %d, head: %d, mv: %d, misc: %d, frame: %d, itex: %d, ptex: %d\n",
@@ -1425,7 +1448,7 @@ static void copy_context_before_encode(MpegEncContext *d, MpegEncContext *s, int
d->p_count= s->p_count;
d->skip_count= s->skip_count;
d->misc_bits= s->misc_bits;
d->last_bits= s->last_bits;
d->last_bits= 0;

d->mb_skiped= s->mb_skiped;
}
@@ -1449,7 +1472,6 @@ static void copy_context_after_encode(MpegEncContext *d, MpegEncContext *s, int
d->p_count= s->p_count;
d->skip_count= s->skip_count;
d->misc_bits= s->misc_bits;
d->last_bits= s->last_bits;

d->mb_intra= s->mb_intra;
d->mb_skiped= s->mb_skiped;
@@ -1479,7 +1501,6 @@ static void encode_picture(MpegEncContext *s, int picture_number)
s->block_wrap[4]=
s->block_wrap[5]= s->mb_width + 2;
s->last_mc_mb_var = s->mc_mb_var;
/* Reset the average MB variance */
s->avg_mb_var = 0;
s->mc_mb_var = 0;
@@ -1524,12 +1545,13 @@ static void encode_picture(MpegEncContext *s, int picture_number)
memset(s->mb_type , MB_TYPE_INTRA, sizeof(UINT8)*s->mb_width*s->mb_height);
}

if(s->avg_mb_var < s->mc_mb_var && s->pict_type != B_TYPE && (!s->force_type) && s->max_b_frames==0){ //FIXME subtract MV bits
// FIXME b-frames & scene change detection
s->input_pict_type= I_TYPE;
if(s->avg_mb_var < s->mc_mb_var && s->pict_type == P_TYPE){ //FIXME subtract MV bits
s->pict_type= I_TYPE;
s->input_picture_in_gop_number=0;
memset(s->mb_type , MB_TYPE_INTRA, sizeof(UINT8)*s->mb_width*s->mb_height);
if(s->max_b_frames==0){
s->input_pict_type= I_TYPE;
s->input_picture_in_gop_number=0;
}
//printf("Scene change detected, encoding as I Frame\n");
}
@@ -1550,8 +1572,11 @@ static void encode_picture(MpegEncContext *s, int picture_number)

// printf("%d %d\n", s->avg_mb_var, s->mc_mb_var);

if (!s->fixed_qscale)
s->qscale = rate_estimate_qscale(s);
if(s->flags&CODEC_FLAG_PASS2)
s->qscale = ff_rate_estimate_qscale_pass2(s);
else if (!s->fixed_qscale)
s->qscale = ff_rate_estimate_qscale(s);


/* precompute matrix */
if (s->out_format == FMT_MJPEG) {
@@ -1667,6 +1692,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
s->mv[0][0][1] = s->p_mv_table[xy][1];
init_put_bits(&s->pb, bit_buf[1], 3000, NULL, NULL);
s->block= s->blocks[next_block];
s->last_bits= 0; //done in copy_context_before_encode but we skip that here

encode_mb(s, s->mv[0][0][0], s->mv[0][0][1]);
d= get_bit_count(&s->pb);
@@ -1810,6 +1836,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
copy_context_after_encode(s, &best_s, -1);
copy_bits(&pb, bit_buf[best], dmin);
s->pb= pb;
s->last_bits= get_bit_count(&s->pb);
} else {
int motion_x, motion_y;
s->mv_type=MV_TYPE_16X16;
@@ -2190,132 +2217,6 @@ static void dct_unquantize_h263_c(MpegEncContext *s,
}
}

/* rate control */

static void rate_control_init(MpegEncContext *s)
{
emms_c();

//initial values, they dont really matter as they will be totally different within a few frames
s->i_pred.coeff= s->p_pred.coeff= 7.0;
s->i_pred.count= s->p_pred.count= 1.0;
s->i_pred.decay= s->p_pred.decay= 0.4;
// use more bits at the beginning, otherwise high motion at the begin will look like shit
s->qsum=100;
s->qcount=100;

s->short_term_qsum=0.001;
s->short_term_qcount=0.001;
}

static double predict(Predictor *p, double q, double var)
{
return p->coeff*var / (q*p->count);
}

static void update_predictor(Predictor *p, double q, double var, double size)
{
double new_coeff= size*q / (var + 1);
if(var<1000) return;
/*{
int pred= predict(p, q, var);
int error= abs(pred-size);
static double sum=0;
static int count=0;
if(count>5) sum+=error;
count++;
if(256*256*256*64%count==0){
printf("%d %f %f\n", count, sum/count, p->coeff);
}
}*/
p->count*= p->decay;
p->coeff*= p->decay;
p->count++;
p->coeff+= new_coeff;
}

static int rate_estimate_qscale(MpegEncContext *s)
{
int qmin= s->qmin;
int qmax= s->qmax;
int rate_q=5;
float q;
int qscale;
float br_compensation;
double diff;
double short_term_q;
double long_term_q;
int last_qscale= s->qscale;
double fps;
INT64 wanted_bits;
emms_c();

fps= (double)s->frame_rate / FRAME_RATE_BASE;
wanted_bits= s->bit_rate*(double)s->picture_number/fps;

if(s->picture_number>2){
/* update predictors */
if(s->last_pict_type == I_TYPE){
//FIXME
}else{ //P Frame
//printf("%d %d %d %f\n", s->qscale, s->last_mc_mb_var, s->frame_bits, s->p_pred.coeff);
update_predictor(&s->p_pred, s->qscale, s->last_mc_mb_var, s->frame_bits);
}
}

if(s->pict_type == I_TYPE){
//FIXME
rate_q= s->qsum/s->qcount;
}else{ //P Frame
int i;
int diff, best_diff=1000000000;
for(i=1; i<=31; i++){
diff= predict(&s->p_pred, i, s->mc_mb_var) - (double)s->bit_rate/fps;
if(diff<0) diff= -diff;
if(diff<best_diff){
best_diff= diff;
rate_q= i;
}
}
}

s->short_term_qsum*=s->qblur;
s->short_term_qcount*=s->qblur;

s->short_term_qsum+= rate_q;
s->short_term_qcount++;
short_term_q= s->short_term_qsum/s->short_term_qcount;
long_term_q= s->qsum/s->qcount*(s->total_bits+1)/(wanted_bits+1); //+1 to avoid nan & 0

// q= (long_term_q - short_term_q)*s->qcompress + short_term_q;
q= 1/((1/long_term_q - 1/short_term_q)*s->qcompress + 1/short_term_q);

diff= s->total_bits - wanted_bits;
br_compensation= (s->bit_rate_tolerance - diff)/s->bit_rate_tolerance;
if(br_compensation<=0.0) br_compensation=0.001;
q/=br_compensation;

qscale= (int)(q + 0.5);
if (qscale<qmin) qscale=qmin;
else if(qscale>qmax) qscale=qmax;
if (qscale<last_qscale-s->max_qdiff) qscale=last_qscale-s->max_qdiff;
else if(qscale>last_qscale+s->max_qdiff) qscale=last_qscale+s->max_qdiff;

s->qsum+= qscale;
s->qcount++;

s->last_pict_type= s->pict_type;
//printf("q:%d diff:%d comp:%f rate_q:%d st_q:%f fvar:%d last_size:%d\n", qscale, (int)diff, br_compensation,
// rate_q, short_term_q, s->mc_mb_var, s->frame_bits);
//printf("%d %d\n", s->bit_rate, (int)fps);
return qscale;
}

AVCodec mpeg1video_encoder = {
"mpeg1video",
CODEC_TYPE_VIDEO,


+ 40
- 7
libavcodec/mpegvideo.h View File

@@ -44,6 +44,24 @@ typedef struct Predictor{
double decay;
} Predictor;

typedef struct RateControlEntry{
int pict_type;
int qscale;
int mv_bits;
int i_tex_bits;
int p_tex_bits;
int misc_bits;
uint64_t expected_bits;
int new_pict_type;
float new_qscale;
}RateControlEntry;

typedef struct RateControlContext{
FILE *stats_file;
int num_entries;
RateControlEntry *entry;
}RateControlContext;

typedef struct ReorderBuffer{
UINT8 *picture[3];
int pict_type;
@@ -78,6 +96,9 @@ typedef struct MpegEncContext {
int flags; /* AVCodecContext.flags (HQ, MV4, ...) */
int force_input_type;/* 0= no force, otherwise I_TYPE, P_TYPE, ... */
int max_b_frames; /* max number of b-frames for encoding */
float b_quant_factor;/* qscale factor between ips and b frames */
int rc_strategy;
int b_frame_strategy;
/* the following fields are managed internally by the encoder */

/* bit output */
@@ -121,9 +142,9 @@ typedef struct MpegEncContext {
int input_pict_type; /* pict_type prior to reordering of frames */
int force_type; /* 0= no force, otherwise I_TYPE, P_TYPE, ... */
int qscale; /* QP */
int last_non_b_qscale; /* QP of last non b frame used for b frame qscale*/
int pict_type; /* I_TYPE, P_TYPE, B_TYPE, ... */
int last_non_b_pict_type; /* used for mpeg4 gmc b-frames */
int last_pict_type; /* used for bit rate stuff (needs that to update the right predictor) */
int last_non_b_pict_type; /* used for mpeg4 gmc b-frames & ratecontrol */
int frame_rate_index;
/* motion compensation */
int unrestricted_mv;
@@ -195,7 +216,7 @@ typedef struct MpegEncContext {
int q_intra_matrix[64];
int q_non_intra_matrix[64];
/* identical to the above but for MMX & these are not permutated */
UINT16 __align8 q_intra_matrix16[64] ;
UINT16 __align8 q_intra_matrix16[64];
UINT16 __align8 q_non_intra_matrix16[64];
int block_last_index[6]; /* last non zero coefficient in block */

@@ -204,18 +225,19 @@ typedef struct MpegEncContext {
/* bit rate control */
int I_frame_bits; //FIXME used in mpeg12 ...
int avg_mb_var; /* average MB variance for current frame */
int mc_mb_var; /* motion compensated MB variance for current frame */
int last_mc_mb_var; /* motion compensated MB variance for last frame */
int mc_mb_var; /* motion compensated MB variance for current frame */
int last_non_b_mc_mb_var;/* motion compensated MB variance for last non b frame */
INT64 wanted_bits;
INT64 total_bits;
int frame_bits; /* bits used for the current frame */
int last_frame_bits; /* bits used for the last frame */
int frame_bits; /* bits used for the current frame */
int pb_frame_bits; /* bits of the last b...bp group */
Predictor i_pred;
Predictor p_pred;
double qsum; /* sum of qscales */
double qcount; /* count of qscales */
double short_term_qsum; /* sum of recent qscales */
double short_term_qcount; /* count of recent qscales */
RateControlContext rc_context;

/* statistics, used for 2-pass encoding */
int mv_bits;
@@ -459,3 +481,14 @@ void mjpeg_encode_mb(MpegEncContext *s,
DCTELEM block[6][64]);
void mjpeg_picture_header(MpegEncContext *s);
void mjpeg_picture_trailer(MpegEncContext *s);

/* rate control */
int ff_rate_control_init(MpegEncContext *s);
int ff_rate_estimate_qscale(MpegEncContext *s);
int ff_rate_estimate_qscale_pass2(MpegEncContext *s);
void ff_write_pass1_stats(MpegEncContext *s);
void ff_rate_control_uninit(MpegEncContext *s);





+ 405
- 0
libavcodec/ratecontrol.c View File

@@ -0,0 +1,405 @@
/*
Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>

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
*/

#include <inttypes.h>
#include <stdio.h>

#include "common.h" //needed for mpegvideo.h to compile
#include "dsputil.h" //needed for mpegvideo.h to compile
#include "avcodec.h"
#include "mpegvideo.h"

#define STATS_FILE "lavc_stats.txt"

static int init_pass2(MpegEncContext *s);

void ff_write_pass1_stats(MpegEncContext *s){
RateControlContext *rcc= &s->rc_context;
// fprintf(c->stats_file, "type:%d q:%d icount:%d pcount:%d scount:%d itex:%d ptex%d mv:%d misc:%d fcode:%d bcode:%d\")
fprintf(rcc->stats_file, "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d\n",
s->picture_number, s->input_picture_number - s->max_b_frames, s->pict_type,
s->qscale, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits, s->f_code, s->b_code);
}

int ff_rate_control_init(MpegEncContext *s)
{
RateControlContext *rcc= &s->rc_context;
emms_c();

if(s->flags&CODEC_FLAG_PASS1){
rcc->stats_file= fopen(STATS_FILE, "w");
if(!rcc->stats_file){
fprintf(stderr, "failed to open " STATS_FILE "\n");
return -1;
}
} else if(s->flags&CODEC_FLAG_PASS2){
int size;
int i;

rcc->stats_file= fopen(STATS_FILE, "r");
if(!rcc->stats_file){
fprintf(stderr, "failed to open " STATS_FILE "\n");
return -1;
}

/* find number of pics without reading the file twice :) */
fseek(rcc->stats_file, 0, SEEK_END);
size= ftell(rcc->stats_file);
fseek(rcc->stats_file, 0, SEEK_SET);

size/= 64; // we need at least 64 byte to store a line ...
rcc->entry = (RateControlEntry*)av_mallocz(size*sizeof(RateControlEntry));

for(i=0; !feof(rcc->stats_file); i++){
RateControlEntry *rce;
int picture_number;
int e;
e= fscanf(rcc->stats_file, "in:%d ", &picture_number);
rce= &rcc->entry[picture_number];
e+=fscanf(rcc->stats_file, "out:%*d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%*d bcode:%*d\n",
&rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits);
if(e!=7){
fprintf(stderr, STATS_FILE " is damaged\n");
return -1;
}
}
rcc->num_entries= i;
if(init_pass2(s) < 0) return -1;
}
/* no 2pass stuff, just normal 1-pass */
//initial values, they dont really matter as they will be totally different within a few frames
s->i_pred.coeff= s->p_pred.coeff= 7.0;
s->i_pred.count= s->p_pred.count= 1.0;
s->i_pred.decay= s->p_pred.decay= 0.4;
// use more bits at the beginning, otherwise high motion at the begin will look like shit
s->qsum=100 * s->qmin;
s->qcount=100;

s->short_term_qsum=0.001;
s->short_term_qcount=0.001;

return 0;
}

void ff_rate_control_uninit(MpegEncContext *s)
{
RateControlContext *rcc= &s->rc_context;
emms_c();

if(rcc->stats_file) fclose(rcc->stats_file);
if(rcc->entry) free(rcc->entry);
rcc->stats_file= NULL;
rcc->entry= NULL;
}

//----------------------------------
// 1 Pass Code

static double predict(Predictor *p, double q, double var)
{
return p->coeff*var / (q*p->count);
}

static void update_predictor(Predictor *p, double q, double var, double size)
{
double new_coeff= size*q / (var + 1);
if(var<1000) return;

p->count*= p->decay;
p->coeff*= p->decay;
p->count++;
p->coeff+= new_coeff;
}

int ff_rate_estimate_qscale(MpegEncContext *s)
{
int qmin= s->qmin;
int qmax= s->qmax;
int rate_q=5;
float q;
int qscale;
float br_compensation;
double diff;
double short_term_q;
double long_term_q;
double fps;
int picture_number= s->input_picture_number - s->max_b_frames;
int64_t wanted_bits;
emms_c();

fps= (double)s->frame_rate / FRAME_RATE_BASE;
wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
// printf("%d %d %d\n", picture_number, (int)wanted_bits, (int)s->total_bits);
if(s->pict_type==B_TYPE){
qmin= (int)(qmin*s->b_quant_factor+0.5);
qmax= (int)(qmax*s->b_quant_factor+0.5);
}
if(qmin<2) qmin=2;
if(qmax>31) qmax=31;
if(qmax<=qmin) qmax= qmin;

/* update predictors */
if(picture_number>2){
if(s->pict_type!=B_TYPE && s->last_non_b_pict_type == P_TYPE){
//printf("%d %d %d %f\n", s->qscale, s->last_mc_mb_var, s->frame_bits, s->p_pred.coeff);
update_predictor(&s->p_pred, s->last_non_b_qscale, s->last_non_b_mc_mb_var, s->pb_frame_bits);
}
}

if(s->pict_type == I_TYPE){
short_term_q= s->short_term_qsum/s->short_term_qcount;
long_term_q= s->qsum/s->qcount*(s->total_bits+1)/(wanted_bits+1); //+1 to avoid nan & 0

q= 1/((1/long_term_q - 1/short_term_q)*s->qcompress + 1/short_term_q);
}else if(s->pict_type==B_TYPE){
q= (int)(s->last_non_b_qscale*s->b_quant_factor+0.5);
}else{ //P Frame
int i;
int diff, best_diff=1000000000;
for(i=1; i<=31; i++){
diff= predict(&s->p_pred, i, s->mc_mb_var) - (double)s->bit_rate/fps;
if(diff<0) diff= -diff;
if(diff<best_diff){
best_diff= diff;
rate_q= i;
}
}
s->short_term_qsum*=s->qblur;
s->short_term_qcount*=s->qblur;

s->short_term_qsum+= rate_q;
s->short_term_qcount++;
short_term_q= s->short_term_qsum/s->short_term_qcount;
long_term_q= s->qsum/s->qcount*(s->total_bits+1)/(wanted_bits+1); //+1 to avoid nan & 0

// q= (long_term_q - short_term_q)*s->qcompress + short_term_q;
q= 1/((1/long_term_q - 1/short_term_q)*s->qcompress + 1/short_term_q);
}

diff= s->total_bits - wanted_bits;
br_compensation= (s->bit_rate_tolerance - diff)/s->bit_rate_tolerance;
if(br_compensation<=0.0) br_compensation=0.001;
q/=br_compensation;
//printf("%f %f %f\n", q, br_compensation, short_term_q);
qscale= (int)(q + 0.5);
if (qscale<qmin) qscale=qmin;
else if(qscale>qmax) qscale=qmax;
if(s->pict_type!=B_TYPE){
s->qsum+= qscale;
s->qcount++;
if (qscale<s->last_non_b_qscale-s->max_qdiff) qscale=s->last_non_b_qscale-s->max_qdiff;
else if(qscale>s->last_non_b_qscale+s->max_qdiff) qscale=s->last_non_b_qscale+s->max_qdiff;
}
//printf("q:%d diff:%d comp:%f rate_q:%d st_q:%f fvar:%d last_size:%d\n", qscale, (int)diff, br_compensation,
// rate_q, short_term_q, s->mc_mb_var, s->frame_bits);
//printf("%d %d\n", s->bit_rate, (int)fps);
return qscale;
}

//----------------------------------------------
// 2-Pass code

static int init_pass2(MpegEncContext *s)
{
RateControlContext *rcc= &s->rc_context;
int i;
double fps= (double)s->frame_rate / FRAME_RATE_BASE;
double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
double avg_quantizer[5];
uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
uint64_t available_bits[5];
uint64_t all_const_bits;
uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
int num_frames[5]={0,0,0,0,0};
double rate_factor=0;
double step;
int last_i_frame=-10000000;

/* find complexity & const_bits & decide the pict_types */
for(i=0; i<rcc->num_entries; i++){
RateControlEntry *rce= &rcc->entry[i];
if(s->b_frame_strategy==0 || s->max_b_frames==0){
rce->new_pict_type= rce->pict_type;
}else{
int j;
int next_non_b_type=P_TYPE;

switch(rce->pict_type){
case I_TYPE:
if(i-last_i_frame>s->gop_size/2){ //FIXME this is not optimal
rce->new_pict_type= I_TYPE;
last_i_frame= i;
}else{
rce->new_pict_type= P_TYPE; // will be caught by the scene detection anyway
}
break;
case P_TYPE:
rce->new_pict_type= P_TYPE;
break;
case B_TYPE:
for(j=i+1; j<i+s->max_b_frames+2 && j<rcc->num_entries; j++){
if(rcc->entry[j].pict_type != B_TYPE){
next_non_b_type= rcc->entry[j].pict_type;
break;
}
}
if(next_non_b_type==I_TYPE)
rce->new_pict_type= P_TYPE;
else
rce->new_pict_type= B_TYPE;
break;
}
}

complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
num_frames[rce->new_pict_type]++;
}
all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
if(all_available_bits < all_const_bits){
fprintf(stderr, "requested bitrate is to low\n");
return -1;
}

// avg_complexity= complexity/rcc->num_entries;
avg_quantizer[P_TYPE]=
avg_quantizer[I_TYPE]= (complexity[I_TYPE]+complexity[P_TYPE] + complexity[B_TYPE]/s->b_quant_factor)
/ (all_available_bits - all_const_bits);
avg_quantizer[B_TYPE]= avg_quantizer[P_TYPE]*s->b_quant_factor;
//printf("avg quantizer: %f %f\n", avg_quantizer[P_TYPE], avg_quantizer[B_TYPE]);

for(i=0; i<5; i++){
available_bits[i]= const_bits[i] + complexity[i]/avg_quantizer[i];
}
//printf("%lld %lld %lld %lld\n", available_bits[I_TYPE], available_bits[P_TYPE], available_bits[B_TYPE], all_available_bits);
for(step=256*256; step>0.0000001; step*=0.5){
uint64_t expected_bits=0;
rate_factor+= step;
/* find qscale */
for(i=0; i<rcc->num_entries; i++){
RateControlEntry *rce= &rcc->entry[i];
double short_term_q, q, bits_left;
const int pict_type= rce->new_pict_type;
int qmin= s->qmin;
int qmax= s->qmax;

if(pict_type==B_TYPE){
qmin= (int)(qmin*s->b_quant_factor+0.5);
qmax= (int)(qmax*s->b_quant_factor+0.5);
}
if(qmin<2) qmin=2;
if(qmax>31) qmax=31;
if(qmax<=qmin) qmax= qmin;
switch(s->rc_strategy){
case 0:
bits_left= available_bits[pict_type]/num_frames[pict_type]*rate_factor - rce->misc_bits - rce->mv_bits;
if(bits_left<1.0) bits_left=1.0;
short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits)/bits_left;
break;
case 1:
bits_left= (available_bits[pict_type] - const_bits[pict_type])/num_frames[pict_type]*rate_factor;
if(bits_left<1.0) bits_left=1.0;
short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits)/bits_left;
break;
case 2:
bits_left= available_bits[pict_type]/num_frames[pict_type]*rate_factor;
if(bits_left<1.0) bits_left=1.0;
short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits + rce->mv_bits)/bits_left;
break;
default:
fprintf(stderr, "unknown strategy\n");
short_term_q=3; //gcc warning fix
}

if(short_term_q>31.0) short_term_q=31.0;
else if (short_term_q<1.0) short_term_q=1.0;

q= 1/((1/avg_quantizer[pict_type] - 1/short_term_q)*s->qcompress + 1/short_term_q);
if (q<qmin) q=qmin;
else if(q>qmax) q=qmax;
//printf("lq:%f, sq:%f t:%f q:%f\n", avg_quantizer[rce->pict_type], short_term_q, bits_left, q);
rce->new_qscale= q;
}

/* smooth curve */
/* find expected bits */
for(i=0; i<rcc->num_entries; i++){
RateControlEntry *rce= &rcc->entry[i];
double factor= rce->qscale / rce->new_qscale;
rce->expected_bits= expected_bits;
expected_bits += (int)(rce->misc_bits + rce->mv_bits + (rce->i_tex_bits + rce->p_tex_bits)*factor + 0.5);
}

// printf("%d %d %f\n", (int)expected_bits, (int)all_available_bits, rate_factor);
if(expected_bits > all_available_bits) rate_factor-= step;
}

return 0;
}

int ff_rate_estimate_qscale_pass2(MpegEncContext *s)
{
int qmin= s->qmin;
int qmax= s->qmax;
float q;
int qscale;
float br_compensation;
double diff;
int picture_number= s->picture_number;
RateControlEntry *rce= &s->rc_context.entry[picture_number];
int64_t wanted_bits= rce->expected_bits;
emms_c();

// printf("%d %d %d\n", picture_number, (int)wanted_bits, (int)s->total_bits);
if(s->pict_type==B_TYPE){
qmin= (int)(qmin*s->b_quant_factor+0.5);
qmax= (int)(qmax*s->b_quant_factor+0.5);
}
if(qmin<2) qmin=2;
if(qmax>31) qmax=31;
if(qmax<=qmin) qmax= qmin;

q= rce->new_qscale;

diff= s->total_bits - wanted_bits;
br_compensation= (s->bit_rate_tolerance - diff)/s->bit_rate_tolerance;
if(br_compensation<=0.0) br_compensation=0.001;
q/=br_compensation;

qscale= (int)(q + 0.5);
if (qscale<qmin) qscale=qmin;
else if(qscale>qmax) qscale=qmax;
// printf("%d %d %d %d type:%d\n", qmin, qscale, qmax, picture_number, s->pict_type); fflush(stdout);
return qscale;
}

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