4 #include "common/common.h"
5 #include "common/cpu.h"
7 struct x264_speedcontrol_t
9 // all times are in usec
10 int64_t timestamp; // when was speedcontrol last invoked
11 int64_t cpu_time; // time spent encoding the previous frame
12 int64_t buffer_size; // assumed application-side buffer of frames to be streamed (measured in microseconds),
13 int64_t buffer_fill; // where full = we don't have to hurry
14 int64_t compensation_period; // how quickly we try to return to the target buffer fullness
15 float uspf; // microseconds per frame
16 int preset; // which setting was used in the previous frame
18 float cplx_num; // rolling average of estimated spf for preset #0
28 int64_t min_buffer, max_buffer;
34 void x264_speedcontrol_new( x264_t *h )
36 x264_speedcontrol_t *sc = h->sc = x264_malloc( sizeof(x264_speedcontrol_t) );
38 memset( sc, 0, sizeof(x264_speedcontrol_t) );
40 if( h->param.sc.f_speed <= 0 )
41 h->param.sc.f_speed = 1;
42 float fps = h->param.i_fps_num / h->param.i_fps_den;
44 h->param.sc.i_buffer_size = X264_MAX( 3, h->param.sc.i_buffer_size );
45 sc->buffer_size = h->param.sc.i_buffer_size * sc->uspf;
46 sc->buffer_fill = sc->buffer_size * h->param.sc.f_buffer_init;
47 sc->buffer_fill = x264_clip3( sc->buffer_fill, sc->uspf, sc->buffer_size );
48 sc->compensation_period = sc->buffer_size/4;
49 sc->timestamp = x264_mdate();
52 sc->cplx_num = 3e3; //FIXME estimate initial complexity
54 sc->cplx_decay = 1 - 1./h->param.sc.i_buffer_size;
55 sc->stat.min_buffer = sc->buffer_size;
56 sc->stat.max_buffer = 0;
58 sc->buffer_complete = 0;
61 void x264_speedcontrol_delete( x264_t *h )
63 x264_speedcontrol_t *sc = h->sc;
66 x264_log( h, X264_LOG_INFO, "speedcontrol: avg preset=%.3f buffer min=%.3f max=%.3f\n",
67 sc->stat.avg_preset / sc->stat.den,
68 (float)sc->stat.min_buffer / sc->buffer_size,
69 (float)sc->stat.max_buffer / sc->buffer_size );
70 // x264_log( h, X264_LOG_INFO, "speedcontrol: avg cplx=%.5f\n", sc->cplx_num / sc->cplx_den );
74 static int dither( x264_speedcontrol_t *sc, float f )
80 if( sc->dither >= 1. )
90 float time; // relative encoding time, compared to the other presets
103 // The actual presets, including the equivalent commandline options. Note that
104 // all presets are benchmarked with --weightp 1 --mbtree --rc-lookahead 20
105 // on top of the given settings (equivalent settings to the "faster" preset).
106 // Timings and SSIM measurements were done on a quadcore Haswell i5 3.2 GHz
107 // on the first 1000 frames of "Tears of Steel" in 1080p.
109 // Note that the two first and the two last are also used for extrapolation
110 // should the desired time be outside the range. Thus, it is disadvantageous if
111 // they are chosen so that the timings are too close to each other.
112 static const sc_preset_t presets[SC_PRESETS] = {
113 #define I4 X264_ANALYSE_I4x4
114 #define I8 X264_ANALYSE_I8x8
115 #define P4 X264_ANALYSE_PSUB8x8
116 #define P8 X264_ANALYSE_PSUB16x16
117 #define B8 X264_ANALYSE_BSUB16x16
118 // Preset 0: 14.179db, --preset superfast --b-adapt 0 --bframes 0
119 { .time= 1.000, .subme=1, .me=X264_ME_DIA, .refs=1, .mix=0, .trellis=0, .partitions=I8|I4, .badapt=0, .bframes=0, .direct=0, .merange=16 },
121 // Preset 1: 14.459db, --preset superfast
122 { .time= 1.283, .subme=1, .me=X264_ME_DIA, .refs=1, .mix=0, .trellis=0, .partitions=I8|I4, .badapt=1, .bframes=3, .direct=1, .merange=16 },
124 // Preset 2: 14.761db, --preset superfast --subme 2
125 { .time= 1.603, .subme=2, .me=X264_ME_DIA, .refs=1, .mix=0, .trellis=0, .partitions=I8|I4, .badapt=1, .bframes=3, .direct=1, .merange=16 },
127 // Preset 3: 15.543db, --preset veryfast
128 { .time= 1.843, .subme=2, .me=X264_ME_HEX, .refs=1, .mix=0, .trellis=0, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
130 // Preset 4: 15.716db, --preset veryfast --subme 3
131 { .time= 2.452, .subme=3, .me=X264_ME_HEX, .refs=1, .mix=0, .trellis=0, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
133 // Preset 5: 15.786db, --preset veryfast --subme 3 --ref 2
134 { .time= 2.733, .subme=3, .me=X264_ME_HEX, .refs=2, .mix=0, .trellis=0, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
136 // Preset 6: 15.813db, --preset veryfast --subme 4 --ref 2
137 { .time= 3.085, .subme=4, .me=X264_ME_HEX, .refs=2, .mix=0, .trellis=0, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
139 // Preset 7: 15.849db, --preset faster
140 { .time= 3.101, .subme=4, .me=X264_ME_HEX, .refs=2, .mix=0, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
142 // Preset 8: 15.857db, --preset faster --mixed-refs
143 { .time= 3.284, .subme=4, .me=X264_ME_HEX, .refs=2, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
145 // Preset 9: 15.869db, --preset faster --mixed-refs --subme 5
146 { .time= 3.587, .subme=5, .me=X264_ME_HEX, .refs=2, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
148 // Preset 10: 16.051db, --preset fast
149 { .time= 3.947, .subme=6, .me=X264_ME_HEX, .refs=2, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
151 // Preset 11: 16.356db, --preset fast --subme 7
152 { .time= 4.041, .subme=7, .me=X264_ME_HEX, .refs=2, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
154 // Preset 12: 16.418db, --preset fast --subme 7 --ref 3
155 { .time= 4.406, .subme=7, .me=X264_ME_HEX, .refs=3, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
157 // Preset 13: 16.460db, --preset medium
158 { .time= 4.707, .subme=7, .me=X264_ME_HEX, .refs=3, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
160 // Preset 14: 16.517db, --preset medium --subme 8
161 { .time= 5.133, .subme=8, .me=X264_ME_HEX, .refs=3, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
163 // Preset 15: 16.523db, --preset medium --subme 8 --me umh
164 { .time= 6.050, .subme=8, .me=X264_ME_UMH, .refs=3, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=1, .bframes=3, .direct=1, .merange=16 },
166 // Preset 16: 16.543db, --preset medium --subme 8 --me umh --direct auto --b-adapt 2
167 { .time= 6.849, .subme=8, .me=X264_ME_UMH, .refs=3, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=2, .bframes=3, .direct=3, .merange=16 },
169 // Preset 17: 16.613db, --preset slow
170 { .time= 8.042, .subme=8, .me=X264_ME_UMH, .refs=5, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=2, .bframes=3, .direct=3, .merange=16 },
172 // Preset 18: 16.641db, --preset slow --subme 9
173 { .time= 8.972, .subme=9, .me=X264_ME_UMH, .refs=5, .mix=1, .trellis=1, .partitions=I8|I4|P8|B8, .badapt=2, .bframes=3, .direct=3, .merange=16 },
175 // Preset 19: 16.895db, --preset slow --subme 9 --trellis 2
176 { .time=10.073, .subme=9, .me=X264_ME_UMH, .refs=5, .mix=1, .trellis=2, .partitions=I8|I4|P8|B8, .badapt=2, .bframes=3, .direct=3, .merange=16 },
178 // Preset 20: 16.918db, --preset slow --subme 9 --trellis 2 --ref 6
179 { .time=11.147, .subme=9, .me=X264_ME_UMH, .refs=6, .mix=1, .trellis=2, .partitions=I8|I4|P8|B8, .badapt=2, .bframes=3, .direct=3, .merange=16 },
181 // Preset 21: 16.934db, --preset slow --subme 9 --trellis 2 --ref 7
182 { .time=12.267, .subme=9, .me=X264_ME_UMH, .refs=7, .mix=1, .trellis=2, .partitions=I8|I4|P8|B8, .badapt=2, .bframes=3, .direct=3, .merange=16 },
184 // Preset 22: 16.948db, --preset slower
185 { .time=13.829, .subme=9, .me=X264_ME_UMH, .refs=8, .mix=1, .trellis=2, .partitions=I8|I4|P8|B8|P4, .badapt=2, .bframes=3, .direct=3, .merange=16 },
187 // Preset 23: 17.058db, --preset slower --subme 10
188 { .time=14.831, .subme=10, .me=X264_ME_UMH, .refs=8, .mix=1, .trellis=2, .partitions=I8|I4|P8|B8|P4, .badapt=2, .bframes=3, .direct=3, .merange=16 },
190 // Preset 24: 17.268db, --preset slower --subme 10 --bframes 8
191 { .time=18.705, .subme=10, .me=X264_ME_UMH, .refs=8, .mix=1, .trellis=2, .partitions=I8|I4|P8|B8|P4, .badapt=2, .bframes=8, .direct=3, .merange=16 },
193 // Preset 25: 17.297db, --preset veryslow
194 { .time=31.419, .subme=10, .me=X264_ME_UMH, .refs=16, .mix=1, .trellis=2, .partitions=I8|I4|P8|B8|P4, .badapt=2, .bframes=8, .direct=3, .merange=24 },
202 static void apply_preset( x264_t *h, int preset )
204 x264_speedcontrol_t *sc = h->sc;
205 preset = x264_clip3( preset, 0, h->param.sc.max_preset-1 );
206 //if( preset != sc->preset )
208 const sc_preset_t *s = &presets[preset];
209 x264_param_t p = h->param;
211 p.i_frame_reference = s->refs;
212 p.i_bframe_adaptive = s->badapt;
213 p.i_bframe = s->bframes;
214 p.analyse.inter = s->partitions;
215 p.analyse.i_subpel_refine = s->subme;
216 p.analyse.i_me_method = s->me;
217 p.analyse.i_trellis = s->trellis;
218 p.analyse.b_mixed_references = s->mix;
219 p.analyse.i_direct_mv_pred = s->direct;
220 p.analyse.i_me_range = s->merange;
221 x264_encoder_reconfig( h, &p );
223 x264_log( h, X264_LOG_DEBUG, "Applying speedcontrol preset %d.\n", preset );
227 void x264_speedcontrol_frame_end( x264_t *h )
229 x264_speedcontrol_t *sc = h->sc;
230 if( h->param.sc.b_alt_timer )
231 sc->cpu_time = x264_mdate() - sc->timestamp;
234 void x264_speedcontrol_frame( x264_t *h )
236 x264_speedcontrol_t *sc = h->sc;
237 int64_t t, delta_t, delta_buffer;
242 // update buffer state after encoding and outputting the previous frame(s)
245 t = sc->timestamp = x264_mdate();
251 delta_f = h->i_frame - sc->prev_frame;
252 delta_t = t - sc->timestamp;
253 delta_buffer = delta_f * sc->uspf / h->param.sc.f_speed - delta_t;
254 if( !sc->buffer_complete )
255 sc->buffer_fill += delta_buffer;
256 sc->prev_frame = h->i_frame;
259 // update the time predictor
262 int cpu_time = h->param.sc.b_alt_timer ? sc->cpu_time : delta_t;
263 float decay = powf( sc->cplx_decay, delta_f );
264 sc->cplx_num *= decay;
265 sc->cplx_den *= decay;
266 sc->cplx_num += cpu_time / presets[sc->preset].time;
267 sc->cplx_den += delta_f;
269 sc->stat.avg_preset += sc->preset * delta_f;
270 sc->stat.den += delta_f;
272 sc->stat.min_buffer = X264_MIN( sc->buffer_fill, sc->stat.min_buffer );
273 sc->stat.max_buffer = X264_MAX( sc->buffer_fill, sc->stat.max_buffer );
275 if( sc->buffer_fill > sc->buffer_size ) // oops, cpu was idle
277 // not really an error, but we'll warn for debugging purposes
278 static int64_t idle_t = 0, print_interval = 0;
279 idle_t += sc->buffer_fill - sc->buffer_size;
280 if( t - print_interval > 1e6 )
282 x264_log( h, X264_LOG_DEBUG, "speedcontrol idle (%.6f sec)\n", idle_t/1e6 );
286 sc->buffer_fill = sc->buffer_size;
288 else if( sc->buffer_fill < 0 && delta_buffer < 0 ) // oops, we're late
290 // don't clip fullness to 0; we'll hope the real buffer was bigger than
291 // specified, and maybe we can catch up. if the application had to drop
292 // frames, then it should override the buffer fullness (FIXME implement this).
293 x264_log( h, X264_LOG_WARNING, "speedcontrol underflow (%.6f sec)\n", sc->buffer_fill/1e6 );
297 // pick the preset that should return the buffer to 3/4-full within a time
298 // specified by compensation_period
299 float target = sc->uspf / h->param.sc.f_speed
300 * (sc->buffer_fill + sc->compensation_period)
301 / (sc->buffer_size*3/4 + sc->compensation_period);
302 float cplx = sc->cplx_num / sc->cplx_den;
304 float filled = (float) sc->buffer_fill / sc->buffer_size;
306 t0 = presets[0].time * cplx;
309 t1 = presets[i].time * cplx;
310 if( t1 >= target || i == h->param.sc.max_preset-1 )
314 // exponential interpolation between states
315 set = i-1 + (log(target) - log(t0)) / (log(t1) - log(t0));
316 set = x264_clip3f( set, -5, (SC_PRESETS-1) + 5 );
317 // Even if our time estimations in the SC_PRESETS array are off
318 // this will push us towards our target fullness
319 set += (40 * (filled-0.75));
320 set = x264_clip3f( set, 0 , h->param.sc.max_preset-1 );
321 apply_preset( h, dither( sc, set ) );
324 if (h->param.i_log_level >= X264_LOG_DEBUG)
326 static float cpu, wall, tgt, den;
327 float decay = 1-1/100.;
328 cpu = cpu*decay + sc->cpu_time;
329 wall = wall*decay + delta_t;
330 tgt = tgt*decay + target;
332 x264_log( h, X264_LOG_DEBUG, "speed: %.2f %d[%.5f] (t/c/w: %6.0f/%6.0f/%6.0f = %.4f) fps=%.2f\r",
333 set, sc->preset, (float)sc->buffer_fill / sc->buffer_size,
334 tgt/den, cpu/den, wall/den, cpu/wall, 1e6*den/wall );
340 void x264_speedcontrol_sync( x264_t *h, float f_buffer_fill, int i_buffer_size, int buffer_complete )
342 x264_speedcontrol_t *sc = h->sc;
343 if( !h->param.sc.i_buffer_size )
346 h->param.sc.i_buffer_size = X264_MAX( 3, i_buffer_size );
347 sc->buffer_size = h->param.sc.i_buffer_size * sc->uspf;
348 sc->cplx_decay = 1 - 1./h->param.sc.i_buffer_size;
349 sc->compensation_period = sc->buffer_size/4;
350 sc->buffer_fill = sc->buffer_size * f_buffer_fill;
351 sc->buffer_complete = !!buffer_complete;