From 6df58551dd33bfdcc45ac8a281eecea1c6f89bfe Mon Sep 17 00:00:00 2001 From: Kieran Kunhya Date: Thu, 20 Jan 2011 13:07:54 +0000 Subject: [PATCH] Add speedcontrol file. --- encoder/speed.c | 257 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 257 insertions(+) create mode 100644 encoder/speed.c diff --git a/encoder/speed.c b/encoder/speed.c new file mode 100644 index 00000000..7b5c400a --- /dev/null +++ b/encoder/speed.c @@ -0,0 +1,257 @@ +#include +#include +#include +#include "common/common.h" +#include "common/cpu.h" + +struct x264_speedcontrol_t +{ + // all times are in usec + int64_t timestamp; // when was speedcontrol last invoked + int64_t cpu_time; // time spent encoding the previous frame + int64_t buffer_size; // assumed application-side buffer of frames to be streamed, + int64_t buffer_fill; // where full = we don't have to hurry + int64_t compensation_period; // how quickly we try to return to the target buffer fullness + float fps, spf; + int preset; // which setting was used in the previous frame + int prev_frame; + float cplx_num; // rolling average of estimated spf for preset #0 + float cplx_den; + float cplx_decay; + float dither; + x264_param_t user_param; + + struct { + int64_t min_buffer, max_buffer; + double avg_preset; + int den; + } stat; +}; + +void x264_speedcontrol_new( x264_t *h ) +{ + x264_speedcontrol_t *sc = h->sc = x264_malloc( sizeof(x264_speedcontrol_t) ); + x264_emms(); + memset( sc, 0, sizeof(x264_speedcontrol_t) ); + + if( h->param.sc.f_speed <= 0 ) + h->param.sc.f_speed = 1; + sc->fps = h->param.i_fps_num / h->param.i_fps_den; + sc->spf = 1e6 / sc->fps; + h->param.sc.i_buffer_size = X264_MAX( 3, h->param.sc.i_buffer_size ); + sc->buffer_size = h->param.sc.i_buffer_size * 1e6 / sc->fps; + sc->buffer_fill = sc->buffer_size * h->param.sc.f_buffer_init; + sc->buffer_fill = x264_clip3( sc->buffer_fill, sc->spf, sc->buffer_size ); + sc->compensation_period = sc->buffer_size/4; + sc->timestamp = x264_mdate(); + sc->preset = -1; + sc->prev_frame = 0; + sc->cplx_num = 3e3; //FIXME estimate initial complexity + sc->cplx_den = .1; + sc->cplx_decay = 1 - 1./h->param.sc.i_buffer_size; + sc->stat.min_buffer = sc->buffer_size; + sc->stat.max_buffer = 0; + sc->user_param = h->param; +} + +void x264_speedcontrol_delete( x264_t *h ) +{ + x264_speedcontrol_t *sc = h->sc; + if( !sc ) + return; + x264_log( h, X264_LOG_INFO, "speedcontrol: avg preset=%.3f buffer min=%.3f max=%.3f\n", + sc->stat.avg_preset / sc->stat.den, + (float)sc->stat.min_buffer / sc->buffer_size, + (float)sc->stat.max_buffer / sc->buffer_size ); +// x264_log( h, X264_LOG_INFO, "speedcontrol: avg cplx=%.5f\n", sc->cplx_num / sc->cplx_den ); + x264_free( sc ); +} + +static int dither( x264_speedcontrol_t *sc, float f ) +{ + int i = f; + if( f < 0 ) + i--; + sc->dither += f - i; + if( sc->dither >= 1. ) + { + sc->dither--; + i++; + } + return i; +} + +typedef struct +{ + float time; // relative encoding time, compared to the other presets + int subme; + int me; + int refs; + int mix; + int trellis; + int partitions; + int chromame; + float psy_rd; + float psy_trellis; +} sc_preset_t; + +#define PRESETS 13 +static const sc_preset_t presets[PRESETS] = +{ +#define I4 X264_ANALYSE_I4x4 +#define I8 X264_ANALYSE_I8x8 +#define P8 X264_ANALYSE_PSUB16x16 +#define B8 X264_ANALYSE_BSUB16x16 +/*0*/ { .time=1.060, .subme=1, .me=X264_ME_DIA, .refs=1, .mix=0, .chromame=0, .trellis=0, .partitions=0, .psy_rd=0 }, +/*1*/ { .time=1.120, .subme=1, .me=X264_ME_DIA, .refs=1, .mix=0, .chromame=0, .trellis=0, .partitions=I8|I4, .psy_rd=0 }, +/*2*/ { .time=1.440, .subme=3, .me=X264_ME_HEX, .refs=1, .mix=0, .chromame=0, .trellis=0, .partitions=I8|I4, .psy_rd=0 }, +/*3*/ { .time=1.620, .subme=5, .me=X264_ME_HEX, .refs=1, .mix=0, .chromame=0, .trellis=0, .partitions=I8|I4, .psy_rd=1.0 }, +/*4*/ { .time=2.660, .subme=6, .me=X264_ME_HEX, .refs=1, .mix=0, .chromame=0, .trellis=0, .partitions=I8|I4, .psy_rd=1.0 }, +/*5*/ { .time=3.560, .subme=6, .me=X264_ME_HEX, .refs=1, .mix=0, .chromame=0, .trellis=1, .partitions=I8|I4, .psy_rd=1.0 }, +/*6*/ { .time=4.640, .subme=6, .me=X264_ME_HEX, .refs=2, .mix=0, .chromame=0, .trellis=1, .partitions=I8|I4, .psy_rd=1.0 }, +/*7*/ { .time=5.190, .subme=7, .me=X264_ME_HEX, .refs=2, .mix=0, .chromame=0, .trellis=1, .partitions=I8|I4, .psy_rd=1.0 }, +/*8*/ { .time=6.190, .subme=7, .me=X264_ME_HEX, .refs=2, .mix=0, .chromame=0, .trellis=1, .partitions=I8|I4|P8|B8, .psy_rd=1.0 }, +/*9*/ { .time=6.920, .subme=7, .me=X264_ME_HEX, .refs=3, .mix=0, .chromame=0, .trellis=1, .partitions=I8|I4|P8|B8, .psy_rd=1.0 }, +/*10*/ { .time=7.070, .subme=8, .me=X264_ME_HEX, .refs=3, .mix=0, .chromame=0, .trellis=1, .partitions=I8|I4|P8|B8, .psy_rd=1.0 }, +/*11*/ { .time=8.800, .subme=8, .me=X264_ME_UMH, .refs=3, .mix=1, .chromame=1, .trellis=1, .partitions=I8|I4|P8|B8, .psy_rd=1.0 }, +/*12*/ { .time=18.570, .subme=8, .me=X264_ME_UMH, .refs=3, .mix=1, .chromame=1, .trellis=2, .partitions=I8|I4|P8|B8, .psy_rd=1.0 } +}; + +static void apply_preset( x264_t *h, int preset ) +{ + x264_speedcontrol_t *sc = h->sc; + preset = x264_clip3( preset, 0, PRESETS-1 ); + //if( preset != sc->preset ) + { + const sc_preset_t *s = &presets[preset]; + x264_param_t p = sc->user_param; + + p.i_frame_reference = s->refs; + p.analyse.inter = s->partitions; + p.analyse.i_subpel_refine = s->subme; + p.analyse.i_me_method = s->me; + p.analyse.i_trellis = s->trellis; + p.analyse.b_mixed_references = s->mix; + p.analyse.b_chroma_me = s->chromame; + p.analyse.f_psy_rd = s->psy_rd; + p.analyse.f_psy_trellis = s->psy_trellis; + x264_encoder_reconfig( h, &p ); + sc->preset = preset; + x264_log( h, X264_LOG_DEBUG, "Applying speedcontrol preset %d.\n", preset ); + } +} + +void x264_speedcontrol_frame_end( x264_t *h ) +{ + x264_speedcontrol_t *sc = h->sc; + if( h->param.sc.b_alt_timer ) + sc->cpu_time = x264_mdate() - sc->timestamp; +} + +void x264_speedcontrol_frame( x264_t *h ) +{ + x264_speedcontrol_t *sc = h->sc; + int64_t t, delta_t, delta_buffer; + int delta_f; + + x264_emms(); + + // update buffer state after encoding and outputting the previous frame(s) + t = x264_mdate(); + delta_f = h->i_frame - sc->prev_frame; + delta_t = t - sc->timestamp; + delta_buffer = delta_f * sc->spf / h->param.sc.f_speed - delta_t; + sc->buffer_fill += delta_buffer; + sc->prev_frame = h->i_frame; + sc->timestamp = t; + + // update the time predictor + if( delta_f ) + { + int cpu_time = h->param.sc.b_alt_timer ? sc->cpu_time : delta_t; + float decay = powf( sc->cplx_decay, delta_f ); + sc->cplx_num *= decay; + sc->cplx_den *= decay; + sc->cplx_num += cpu_time / presets[sc->preset].time; + sc->cplx_den += delta_f; + + sc->stat.avg_preset += sc->preset * delta_f; + sc->stat.den += delta_f; + } + sc->stat.min_buffer = X264_MIN( sc->buffer_fill, sc->stat.min_buffer ); + sc->stat.max_buffer = X264_MAX( sc->buffer_fill, sc->stat.max_buffer ); + + if( sc->buffer_fill > sc->buffer_size ) // oops, cpu was idle + { + // not really an error, but we'll warn for debugging purposes + static int64_t idle_t = 0, print_interval = 0; + idle_t += sc->buffer_fill - sc->buffer_size; + if( t - print_interval > 1e6 ) + { + x264_log( h, X264_LOG_WARNING, "speedcontrol idle (%.6f sec)\n", idle_t/1e6 ); + print_interval = t; + idle_t = 0; + } + sc->buffer_fill = sc->buffer_size; + } + else if( sc->buffer_fill < 0 && delta_buffer < 0 ) // oops, we're late + { + // don't clip fullness to 0; we'll hope the real buffer was bigger than + // specified, and maybe we can catch up. if the application had to drop + // frames, then it should override the buffer fullness (FIXME implement this). + x264_log( h, X264_LOG_WARNING, "speedcontrol underflow (%.6f sec)\n", sc->buffer_fill/1e6 ); + } + + { + // pick the preset that should return the buffer to 3/4-full within a time + // specified by compensation_period + float target = sc->spf / h->param.sc.f_speed + * (sc->buffer_fill + sc->compensation_period) + / (sc->buffer_size*3/4 + sc->compensation_period); + float cplx = sc->cplx_num / sc->cplx_den; + float set, t0, t1; + float filled = (float) sc->buffer_fill / sc->buffer_size; + int i; + t0 = presets[0].time * cplx; + for( i=1;; i++ ) + { + t1 = presets[i].time * cplx; + if( t1 >= target || i == PRESETS-1 ) + break; + t0 = t1; + } + // linear interpolation between states + set = i-1 + (target - t0) / (t1 - t0); + // Even if our time estimations in the PRESETS array are off + // this will push us towards our target fullness + set += (20 * (filled-0.75)); + set = x264_clip3f(set,0,PRESETS-1); + apply_preset( h, dither( sc, set ) ); + + // FIXME + if (h->param.i_log_level >= X264_LOG_DEBUG) + { + static float cpu, wall, tgt, den; + float decay = 1-1/100.; + cpu = cpu*decay + sc->cpu_time; + wall = wall*decay + delta_t; + tgt = tgt*decay + target; + den = den*decay + 1; + fprintf( stderr, "speed: %.2f %d[%.5f] (t/c/w: %6.0f/%6.0f/%6.0f = %.4f) fps=%.2f\r", + set, sc->preset, (float)sc->buffer_fill / sc->buffer_size, + tgt/den, cpu/den, wall/den, cpu/wall, 1e6*den/wall ); + } + } + +} + +void x264_speedcontrol_sync( x264_t *h, float f_buffer_fill, int i_buffer_size ) +{ + x264_speedcontrol_t *sc = h->sc; + if( !h->param.sc.i_buffer_size ) + return; + if( i_buffer_size ) + h->param.sc.i_buffer_size = X264_MAX( 3, h->param.sc.i_buffer_size ); + sc->buffer_size = h->param.sc.i_buffer_size * 1e6 / sc->fps; + sc->buffer_fill = sc->buffer_size * f_buffer_fill; +} -- 2.39.5