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Snow 1pass ratecontrol

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Originally committed as revision 5416 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2006-05-28 12:38:10 +00:00
parent ac2750ec79
commit 4e64beadf0
3 changed files with 75 additions and 18 deletions
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4
ffmpeg.c
View File

@ -2402,9 +2402,9 @@ static void opt_pre_me(const char *arg)
static void opt_qscale(const char *arg)
{
video_qscale = atof(arg);
if (video_qscale < 0.01 ||
if (video_qscale <= 0 ||
video_qscale > 255) {
fprintf(stderr, "qscale must be >= 0.01 and <= 255\n");
fprintf(stderr, "qscale must be > 0.0 and <= 255\n");
exit(1);
}
}

87
libavcodec/snow.c
View File

@ -444,6 +444,7 @@ typedef struct SnowContext{
int qlog;
int lambda;
int lambda2;
int pass1_rc;
int mv_scale;
int qbias;
#define QBIAS_SHIFT 3
@ -3852,6 +3853,50 @@ static int common_init(AVCodecContext *avctx){
return 0;
}
static void ratecontrol_1pass(SnowContext *s, AVFrame *pict)
{
/* estimate the frame's complexity as a sum of weighted dwt coefs.
* FIXME we know exact mv bits at this point,
* but ratecontrol isn't set up to include them. */
uint32_t coef_sum= 0;
int level, orientation;
for(level=0; level<s->spatial_decomposition_count; level++){
for(orientation=level ? 1 : 0; orientation<4; orientation++){
SubBand *b= &s->plane[0].band[level][orientation];
DWTELEM *buf= b->buf;
const int w= b->width;
const int h= b->height;
const int stride= b->stride;
const int qlog= clip(2*QROOT + b->qlog, 0, QROOT*16);
const int qmul= qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
const int qdiv= (1<<16)/qmul;
int x, y;
if(orientation==0)
decorrelate(s, b, buf, stride, 1, 0);
for(y=0; y<h; y++)
for(x=0; x<w; x++)
coef_sum+= abs(buf[x+y*stride]) * qdiv >> 16;
if(orientation==0)
correlate(s, b, buf, stride, 1, 0);
}
}
/* ugly, ratecontrol just takes a sqrt again */
coef_sum = (uint64_t)coef_sum * coef_sum >> 16;
assert(coef_sum < INT_MAX);
if(pict->pict_type == I_TYPE){
s->m.current_picture.mb_var_sum= coef_sum;
s->m.current_picture.mc_mb_var_sum= 0;
}else{
s->m.current_picture.mc_mb_var_sum= coef_sum;
s->m.current_picture.mb_var_sum= 0;
}
pict->quality= ff_rate_estimate_qscale(&s->m, 1);
s->lambda= pict->quality * 3/2;
}
static void calculate_vissual_weight(SnowContext *s, Plane *p){
int width = p->width;
@ -3910,10 +3955,11 @@ static int encode_init(AVCodecContext *avctx)
if(!avctx->stats_out)
avctx->stats_out = av_mallocz(256);
}
if(avctx->flags&CODEC_FLAG_PASS2){
if(!(avctx->flags&CODEC_FLAG_QSCALE)){
if(ff_rate_control_init(&s->m) < 0)
return -1;
}
s->pass1_rc= !(avctx->flags & (CODEC_FLAG_QSCALE|CODEC_FLAG_PASS2));
for(plane_index=0; plane_index<3; plane_index++){
calculate_vissual_weight(s, &s->plane[plane_index]);
@ -3993,25 +4039,31 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
}
s->new_picture = *pict;
s->m.picture_number= avctx->frame_number;
if(avctx->flags&CODEC_FLAG_PASS2){
s->m.pict_type =
pict->pict_type= s->m.rc_context.entry[avctx->frame_number].new_pict_type;
s->keyframe= pict->pict_type==FF_I_TYPE;
s->m.picture_number= avctx->frame_number;
if(!(avctx->flags&CODEC_FLAG_QSCALE))
pict->quality= ff_rate_estimate_qscale(&s->m, 0);
}else{
s->keyframe= avctx->gop_size==0 || avctx->frame_number % avctx->gop_size == 0;
s->m.pict_type=
pict->pict_type= s->keyframe ? FF_I_TYPE : FF_P_TYPE;
}
if(s->pass1_rc && avctx->frame_number == 0)
pict->quality= 2*FF_QP2LAMBDA;
if(pict->quality){
s->qlog= rint(QROOT*log(pict->quality / (float)FF_QP2LAMBDA)/log(2));
//<64 >60
s->qlog += 61*QROOT/8;
}else{
s->qlog= LOSSLESS_QLOG;
s->lambda = pict->quality * 3/2;
}
if(s->qlog < 0 || (!pict->quality && (avctx->flags & CODEC_FLAG_QSCALE))){
s->qlog= LOSSLESS_QLOG;
s->lambda = 0;
}//else keep previous frame's qlog until after motion est
frame_start(s);
s->current_picture.key_frame= s->keyframe;
@ -4050,7 +4102,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
s->m.out_format= FMT_H263;
s->m.unrestricted_mv= 1;
s->lambda = s->m.lambda= pict->quality * 3/2; //FIXME bug somewhere else
s->m.lambda = s->lambda;
s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
s->lambda2= s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
@ -4061,6 +4113,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
redo_frame:
s->m.pict_type = pict->pict_type;
s->qbias= pict->pict_type == P_TYPE ? 2 : 0;
encode_header(s);
@ -4086,6 +4139,7 @@ redo_frame:
if( plane_index==0
&& pict->pict_type == P_TYPE
&& !(avctx->flags&CODEC_FLAG_PASS2)
&& s->m.me.scene_change_score > s->avctx->scenechange_threshold){
ff_init_range_encoder(c, buf, buf_size);
ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
@ -4105,6 +4159,9 @@ redo_frame:
ff_spatial_dwt(s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
if(s->pass1_rc && plane_index==0)
ratecontrol_1pass(s, pict);
for(level=0; level<s->spatial_decomposition_count; level++){
for(orientation=level ? 1 : 0; orientation<4; orientation++){
SubBand *b= &p->band[level][orientation];
@ -4160,17 +4217,17 @@ STOP_TIMER("pred-conv")}
s->current_picture.coded_picture_number = avctx->frame_number;
s->current_picture.pict_type = pict->pict_type;
s->current_picture.quality = pict->quality;
if(avctx->flags&CODEC_FLAG_PASS1){
s->m.p_tex_bits = 8*(s->c.bytestream - s->c.bytestream_start) - s->m.misc_bits - s->m.mv_bits;
s->m.current_picture.display_picture_number =
s->m.current_picture.coded_picture_number = avctx->frame_number;
s->m.pict_type = pict->pict_type;
s->m.current_picture.quality = pict->quality;
s->m.frame_bits = 8*(s->c.bytestream - s->c.bytestream_start);
s->m.p_tex_bits = s->m.frame_bits - s->m.misc_bits - s->m.mv_bits;
s->m.current_picture.display_picture_number =
s->m.current_picture.coded_picture_number = avctx->frame_number;
s->m.current_picture.quality = pict->quality;
s->m.total_bits += 8*(s->c.bytestream - s->c.bytestream_start);
if(s->pass1_rc)
ff_rate_estimate_qscale(&s->m, 0);
if(avctx->flags&CODEC_FLAG_PASS1)
ff_write_pass1_stats(&s->m);
}
if(avctx->flags&CODEC_FLAG_PASS2){
s->m.total_bits += 8*(s->c.bytestream - s->c.bytestream_start);
}
s->m.last_pict_type = s->m.pict_type;
emms_c();

2
tests/regression.sh
View File

@ -496,7 +496,7 @@ fi
if [ -n "$do_snowll" ] ; then
# snow encoding
file=${outfile}snow53.avi
do_ffmpeg $file -y -strict -2 -f pgmyuv -i $raw_src -an -vcodec snow -pred 1 -flags +mv4+qpel $file
do_ffmpeg $file -y -strict -2 -f pgmyuv -i $raw_src -an -vcodec snow -qscale .001 -pred 1 -flags +mv4+qpel $file
# snow decoding
do_ffmpeg $raw_dst -y -i $file -f rawvideo $raw_dst