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frame skip support

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Originally committed as revision 3742 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-12-08 11:46:16 +00:00
parent 2f3eca0806
commit bbf18b21b7
3 changed files with 80 additions and 3 deletions
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6
ffmpeg.c
View File

@ -193,6 +193,8 @@ static int video_level = FF_LEVEL_UNKNOWN;
static int nsse_weight = 8;
static int subpel_quality= 8;
static int lowres= 0;
static int frame_skip_threshold= 0;
static int frame_skip_factor= 0;
extern int loop_input; /* currently a hack */
static int gop_size = 12;
@ -3223,6 +3225,8 @@ static void opt_output_file(const char *filename)
video_enc->level= video_level;
video_enc->nsse_weight= nsse_weight;
video_enc->me_subpel_quality= subpel_quality;
video_enc->frame_skip_threshold= frame_skip_threshold;
video_enc->frame_skip_factor= frame_skip_factor;
if(packet_size){
video_enc->rtp_mode= 1;
@ -3949,6 +3953,8 @@ const OptionDef options[] = {
{ "subq", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&subpel_quality}, "", "" },
{ "lowres", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&lowres}, "", "" },
{ "vtag", HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)opt_video_tag}, "force video tag/fourcc", "fourcc/tag" },
{ "skip_threshold", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&frame_skip_threshold}, "frame skip threshold", "threshold" },
{ "skip_factor", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&frame_skip_factor}, "frame skip factor", "factor" },
/* audio options */
{ "ab", HAS_ARG | OPT_AUDIO, {(void*)opt_audio_bitrate}, "set audio bitrate (in kbit/s)", "bitrate", },

18
libavcodec/avcodec.h
View File

@ -17,7 +17,7 @@ extern "C" {
#define FFMPEG_VERSION_INT 0x000409
#define FFMPEG_VERSION "0.4.9-pre1"
#define LIBAVCODEC_BUILD 4734
#define LIBAVCODEC_BUILD 4735
#define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
#define LIBAVCODEC_VERSION FFMPEG_VERSION
@ -1683,12 +1683,26 @@ typedef struct AVCodecContext {
int lowres;
/**
* bistream width / height. may be different from width/height if lowres
* bitsream width / height. may be different from width/height if lowres
* or other things are used
* - encoding: unused
* - decoding: set by user before init if known, codec should override / dynamically change if needed
*/
int coded_width, coded_height;
/**
* frame skip threshold
* - encoding: set by user
* - decoding: unused
*/
int frame_skip_threshold;
/**
* frame skip factor
* - encoding: set by user
* - decoding: unused
*/
int frame_skip_factor;
} AVCodecContext;

59
libavcodec/mpegvideo.c
View File

@ -2018,6 +2018,44 @@ static int load_input_picture(MpegEncContext *s, AVFrame *pic_arg){
return 0;
}
static inline int block_max(DCTELEM *block){
int i, max;
max=0;
for(i=0; i<64; i++){
int v= ABS(block[i]);
if(v>max) max= v;
}
return max;
}
static int skip_check(MpegEncContext *s, Picture *p, Picture *ref){
int x, y, plane;
int score=0;
for(plane=0; plane<3; plane++){
const int stride= p->linesize[plane];
const int bw= plane ? 1 : 2;
for(y=0; y<s->mb_height*bw; y++){
for(x=0; x<s->mb_width*bw; x++){
int v;
s->dsp.diff_pixels(s->block[0], p->data[plane] + 8*(x + y*stride), ref->data[plane] + 8*(x + y*stride), stride);
v= block_max(s->block[0]);
if(v>score)
score=v;
}
}
}
if(score < s->avctx->frame_skip_threshold)
return 1;
if(score < ((s->avctx->frame_skip_factor * s->lambda)>>8))
return 1;
return 0;
}
static void select_input_picture(MpegEncContext *s){
int i;
@ -2033,7 +2071,26 @@ static void select_input_picture(MpegEncContext *s){
s->reordered_input_picture[0]->coded_picture_number= s->coded_picture_number++;
}else{
int b_frames;
if(s->avctx->frame_skip_threshold || s->avctx->frame_skip_factor){
if(skip_check(s, s->input_picture[0], s->next_picture_ptr)){
//av_log(NULL, AV_LOG_DEBUG, "skip %p %Ld\n", s->input_picture[0]->data[0], s->input_picture[0]->pts);
if(s->input_picture[0]->type == FF_BUFFER_TYPE_SHARED){
for(i=0; i<4; i++)
s->input_picture[0]->data[i]= NULL;
s->input_picture[0]->type= 0;
}else{
assert( s->input_picture[0]->type==FF_BUFFER_TYPE_USER
|| s->input_picture[0]->type==FF_BUFFER_TYPE_INTERNAL);
s->avctx->release_buffer(s->avctx, (AVFrame*)s->input_picture[0]);
}
goto no_output_pic;
}
}
if(s->flags&CODEC_FLAG_PASS2){
for(i=0; i<s->max_b_frames+1; i++){
int pict_num= s->input_picture[0]->display_picture_number + i;
@ -2116,7 +2173,7 @@ static void select_input_picture(MpegEncContext *s){
}
}
}
no_output_pic:
if(s->reordered_input_picture[0]){
s->reordered_input_picture[0]->reference= s->reordered_input_picture[0]->pict_type!=B_TYPE ? 3 : 0;