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Revision 1.2 - (view) (download)
| 1 : | edgomez | 1.2 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | * XviD Standard Plugins | ||
| 4 : | * - single-pass bitrate controller implementation - | ||
| 5 : | * | ||
| 6 : | * Copyright(C) 2002 Benjamin Lambert <foxer@hotmail.com> | ||
| 7 : | * 2002-2003 Edouard Gomez <ed.gomez@free.fr> | ||
| 8 : | * | ||
| 9 : | * This program is free software; you can redistribute it and/or modify | ||
| 10 : | * it under the terms of the GNU General Public License as published by | ||
| 11 : | * the Free Software Foundation; either version 2 of the License, or | ||
| 12 : | * (at your option) any later version. | ||
| 13 : | * | ||
| 14 : | * This program is distributed in the hope that it will be useful, | ||
| 15 : | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 16 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 17 : | * GNU General Public License for more details. | ||
| 18 : | * | ||
| 19 : | * You should have received a copy of the GNU General Public License | ||
| 20 : | * along with this program; if not, write to the Free Software | ||
| 21 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 22 : | * | ||
| 23 : | * $Id$ | ||
| 24 : | * | ||
| 25 : | ****************************************************************************/ | ||
| 26 : | |||
| 27 : | |||
| 28 : | #include <limits.h> | ||
| 29 : | |||
| 30 : | #include "../xvid.h" | ||
| 31 : | #include "../image/image.h" | ||
| 32 : | |||
| 33 : | #define DEFAULT_INITIAL_QUANTIZER 4 | ||
| 34 : | |||
| 35 : | #define DEFAULT_BITRATE 900000 /* 900kbps */ | ||
| 36 : | #define DEFAULT_DELAY_FACTOR 16 | ||
| 37 : | #define DEFAULT_AVERAGING_PERIOD 100 | ||
| 38 : | #define DEFAULT_BUFFER 100 | ||
| 39 : | |||
| 40 : | typedef struct | ||
| 41 : | { | ||
| 42 : | int reaction_delay_factor; | ||
| 43 : | int averaging_period; | ||
| 44 : | int buffer; | ||
| 45 : | |||
| 46 : | int bytes_per_sec; | ||
| 47 : | double target_framesize; | ||
| 48 : | |||
| 49 : | double time; | ||
| 50 : | int64_t total_size; | ||
| 51 : | int rtn_quant; | ||
| 52 : | |||
| 53 : | double sequence_quality; | ||
| 54 : | double avg_framesize; | ||
| 55 : | double quant_error[31]; | ||
| 56 : | |||
| 57 : | double fq_error; | ||
| 58 : | } | ||
| 59 : | rc_single_t; | ||
| 60 : | |||
| 61 : | |||
| 62 : | static int | ||
| 63 : | get_initial_quant(unsigned int bitrate) | ||
| 64 : | { | ||
| 65 : | |||
| 66 : | #if defined(DEFAULT_INITIAL_QUANTIZER) | ||
| 67 : | return (DEFAULT_INITIAL_QUANTIZER); | ||
| 68 : | #else | ||
| 69 : | int i; | ||
| 70 : | |||
| 71 : | const unsigned int bitrate_quant[31] = { | ||
| 72 : | UINT_MAX | ||
| 73 : | }; | ||
| 74 : | |||
| 75 : | for (i = 30; i >= 0; i--) { | ||
| 76 : | if (bitrate > bitrate_quant[i]) | ||
| 77 : | continue; | ||
| 78 : | } | ||
| 79 : | |||
| 80 : | return (i + 1); | ||
| 81 : | #endif | ||
| 82 : | } | ||
| 83 : | |||
| 84 : | static int | ||
| 85 : | rc_single_create(xvid_plg_create_t * create, | ||
| 86 : | rc_single_t ** handle) | ||
| 87 : | { | ||
| 88 : | xvid_plugin_single_t *param = (xvid_plugin_single_t *) create->param; | ||
| 89 : | rc_single_t *rc; | ||
| 90 : | int i; | ||
| 91 : | |||
| 92 : | /* | ||
| 93 : | * single needs to caclculate the average frame size. In order to do that, | ||
| 94 : | * we really need valid fps | ||
| 95 : | */ | ||
| 96 : | if (create->fincr == 0) { | ||
| 97 : | return XVID_ERR_FAIL; | ||
| 98 : | } | ||
| 99 : | |||
| 100 : | /* Allocate context struct */ | ||
| 101 : | if ((rc = malloc(sizeof(rc_single_t))) == NULL) | ||
| 102 : | return (XVID_ERR_MEMORY); | ||
| 103 : | |||
| 104 : | /* Constants */ | ||
| 105 : | rc->bytes_per_sec = (param->bitrate > 0) ? param->bitrate / 8 : DEFAULT_BITRATE / 8; | ||
| 106 : | rc->target_framesize =(double) rc->bytes_per_sec / ((double) create->fbase / create->fincr); | ||
| 107 : | rc->reaction_delay_factor = (param->reaction_delay_factor > 0) ? param->reaction_delay_factor : DEFAULT_DELAY_FACTOR; | ||
| 108 : | rc->averaging_period = (param->averaging_period > 0) ? param->averaging_period : DEFAULT_AVERAGING_PERIOD; | ||
| 109 : | rc->buffer = (param->buffer > 0) ? param->buffer : DEFAULT_BUFFER; | ||
| 110 : | |||
| 111 : | rc->time = 0; | ||
| 112 : | rc->total_size = 0; | ||
| 113 : | rc->rtn_quant = get_initial_quant(param->bitrate); | ||
| 114 : | |||
| 115 : | /* Reset quant error accumulators */ | ||
| 116 : | for (i = 0; i < 31; i++) | ||
| 117 : | rc->quant_error[i] = 0.0; | ||
| 118 : | |||
| 119 : | /* Last bunch of variables */ | ||
| 120 : | rc->sequence_quality = 2.0 / (double) rc->rtn_quant; | ||
| 121 : | rc->avg_framesize = rc->target_framesize; | ||
| 122 : | |||
| 123 : | rc->fq_error = 0; | ||
| 124 : | |||
| 125 : | /* Bind the RC */ | ||
| 126 : | *handle = rc; | ||
| 127 : | |||
| 128 : | /* A bit of debug info */ | ||
| 129 : | DPRINTF(XVID_DEBUG_RC, "bytes_per_sec: %i\n", rc->bytes_per_sec); | ||
| 130 : | DPRINTF(XVID_DEBUG_RC, "frame rate : %f\n", (double) create->fbase / create->fincr); | ||
| 131 : | DPRINTF(XVID_DEBUG_RC, "target_framesize: %f\n", rc->target_framesize); | ||
| 132 : | |||
| 133 : | return (0); | ||
| 134 : | } | ||
| 135 : | |||
| 136 : | |||
| 137 : | static int | ||
| 138 : | rc_single_destroy(rc_single_t * rc, | ||
| 139 : | xvid_plg_destroy_t * destroy) | ||
| 140 : | { | ||
| 141 : | free(rc); | ||
| 142 : | return (0); | ||
| 143 : | } | ||
| 144 : | |||
| 145 : | |||
| 146 : | static int | ||
| 147 : | rc_single_before(rc_single_t * rc, | ||
| 148 : | xvid_plg_data_t * data) | ||
| 149 : | { | ||
| 150 : | if (data->quant <= 0) { | ||
| 151 : | if (data->zone && data->zone->mode == XVID_ZONE_QUANT) { | ||
| 152 : | rc->fq_error += (double)data->zone->increment / (double)data->zone->base; | ||
| 153 : | data->quant = (int)rc->fq_error; | ||
| 154 : | rc->fq_error -= data->quant; | ||
| 155 : | } else { | ||
| 156 : | int q = rc->rtn_quant; | ||
| 157 : | /* limit to min/max range | ||
| 158 : | we don't know frame type of the next frame, so we just use | ||
| 159 : | P-VOP's range... */ | ||
| 160 : | if (q > data->max_quant[XVID_TYPE_PVOP-1]) | ||
| 161 : | q = data->max_quant[XVID_TYPE_PVOP-1]; | ||
| 162 : | else if (q < data->min_quant[XVID_TYPE_PVOP-1]) | ||
| 163 : | q = data->min_quant[XVID_TYPE_PVOP-1]; | ||
| 164 : | |||
| 165 : | data->quant = q; | ||
| 166 : | } | ||
| 167 : | } | ||
| 168 : | return 0; | ||
| 169 : | } | ||
| 170 : | |||
| 171 : | |||
| 172 : | static int | ||
| 173 : | rc_single_after(rc_single_t * rc, | ||
| 174 : | xvid_plg_data_t * data) | ||
| 175 : | { | ||
| 176 : | int64_t deviation; | ||
| 177 : | int rtn_quant; | ||
| 178 : | double overflow; | ||
| 179 : | double averaging_period; | ||
| 180 : | double reaction_delay_factor; | ||
| 181 : | double quality_scale; | ||
| 182 : | double base_quality; | ||
| 183 : | double target_quality; | ||
| 184 : | |||
| 185 : | /* Update internal values */ | ||
| 186 : | rc->time += (double) data->fincr / data->fbase; | ||
| 187 : | rc->total_size += data->length; | ||
| 188 : | |||
| 189 : | if(data->type == XVID_TYPE_BVOP) | ||
| 190 : | return (0); | ||
| 191 : | |||
| 192 : | rc->rtn_quant = data->quant; | ||
| 193 : | |||
| 194 : | /* Compute the deviation from expected total size */ | ||
| 195 : | deviation = | ||
| 196 : | rc->total_size - rc->bytes_per_sec * rc->time; | ||
| 197 : | |||
| 198 : | |||
| 199 : | if (data->quant >= 2) { | ||
| 200 : | |||
| 201 : | averaging_period = (double) rc->averaging_period; | ||
| 202 : | |||
| 203 : | rc->sequence_quality -= rc->sequence_quality / averaging_period; | ||
| 204 : | |||
| 205 : | rc->sequence_quality += | ||
| 206 : | 2.0 / (double) data->quant / averaging_period; | ||
| 207 : | |||
| 208 : | if (rc->sequence_quality < 0.1) | ||
| 209 : | rc->sequence_quality = 0.1; | ||
| 210 : | |||
| 211 : | if (data->type != XVID_TYPE_IVOP) { | ||
| 212 : | reaction_delay_factor = (double) rc->reaction_delay_factor; | ||
| 213 : | rc->avg_framesize -= rc->avg_framesize / reaction_delay_factor; | ||
| 214 : | rc->avg_framesize += data->length / reaction_delay_factor; | ||
| 215 : | } | ||
| 216 : | |||
| 217 : | } | ||
| 218 : | |||
| 219 : | quality_scale = | ||
| 220 : | rc->target_framesize / rc->avg_framesize * rc->target_framesize / | ||
| 221 : | rc->avg_framesize; | ||
| 222 : | |||
| 223 : | base_quality = rc->sequence_quality; | ||
| 224 : | if (quality_scale >= 1.0) { | ||
| 225 : | base_quality = 1.0 - (1.0 - base_quality) / quality_scale; | ||
| 226 : | } else { | ||
| 227 : | base_quality = 0.06452 + (base_quality - 0.06452) * quality_scale; | ||
| 228 : | } | ||
| 229 : | |||
| 230 : | overflow = -((double) deviation / (double) rc->buffer); | ||
| 231 : | |||
| 232 : | target_quality = | ||
| 233 : | base_quality + (base_quality - | ||
| 234 : | 0.06452) * overflow / rc->target_framesize; | ||
| 235 : | |||
| 236 : | if (target_quality > 2.0) | ||
| 237 : | target_quality = 2.0; | ||
| 238 : | else if (target_quality < 0.06452) | ||
| 239 : | target_quality = 0.06452; | ||
| 240 : | |||
| 241 : | rtn_quant = (int) (2.0 / target_quality); | ||
| 242 : | |||
| 243 : | if (rtn_quant > 0 && rtn_quant < 31) { | ||
| 244 : | rc->quant_error[rtn_quant - 1] += 2.0 / target_quality - rtn_quant; | ||
| 245 : | if (rc->quant_error[rtn_quant - 1] >= 1.0) { | ||
| 246 : | rc->quant_error[rtn_quant - 1] -= 1.0; | ||
| 247 : | rtn_quant++; | ||
| 248 : | } | ||
| 249 : | } | ||
| 250 : | |||
| 251 : | /* prevent rapid quantization change */ | ||
| 252 : | if (rtn_quant > data->quant + 1) | ||
| 253 : | rtn_quant = data->quant + 1; | ||
| 254 : | else if (rtn_quant < data->quant - 1) | ||
| 255 : | rtn_quant = data->quant - 1; | ||
| 256 : | |||
| 257 : | rc->rtn_quant = rtn_quant; | ||
| 258 : | |||
| 259 : | return (0); | ||
| 260 : | } | ||
| 261 : | |||
| 262 : | |||
| 263 : | |||
| 264 : | int | ||
| 265 : | xvid_plugin_single(void *handle, | ||
| 266 : | int opt, | ||
| 267 : | void *param1, | ||
| 268 : | void *param2) | ||
| 269 : | { | ||
| 270 : | switch (opt) { | ||
| 271 : | case XVID_PLG_INFO: | ||
| 272 : | case XVID_PLG_FRAME : | ||
| 273 : | return 0; | ||
| 274 : | |||
| 275 : | case XVID_PLG_CREATE: | ||
| 276 : | return rc_single_create((xvid_plg_create_t *) param1, param2); | ||
| 277 : | |||
| 278 : | case XVID_PLG_DESTROY: | ||
| 279 : | return rc_single_destroy((rc_single_t *) handle,(xvid_plg_destroy_t *) param1); | ||
| 280 : | |||
| 281 : | case XVID_PLG_BEFORE: | ||
| 282 : | return rc_single_before((rc_single_t *) handle, (xvid_plg_data_t *) param1); | ||
| 283 : | |||
| 284 : | case XVID_PLG_AFTER: | ||
| 285 : | return rc_single_after((rc_single_t *) handle, (xvid_plg_data_t *) param1); | ||
| 286 : | } | ||
| 287 : | |||
| 288 : | return XVID_ERR_FAIL; | ||
| 289 : | } |
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