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Revision 994 - (view) (download)
| 1 : | suxen_drol | 938 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | edgomez | 994 | * XviD Standard Plugins |
| 4 : | suxen_drol | 938 | * - CBR/ABR bitrate controller implementation - |
| 5 : | * | ||
| 6 : | edgomez | 994 | * Copyright(C) 2002 Benjamin Lambert <foxer@hotmail.com> |
| 7 : | * 2002-2003 Edouard Gomez <ed.gomez@free.fr> | ||
| 8 : | suxen_drol | 938 | * |
| 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 : | edgomez | 994 | * $Id: plugin_cbr.c,v 1.1.2.3 2003-04-27 15:40:50 edgomez Exp $ |
| 24 : | suxen_drol | 938 | * |
| 25 : | ****************************************************************************/ | ||
| 26 : | |||
| 27 : | |||
| 28 : | edgomez | 994 | #include <limits.h> |
| 29 : | |||
| 30 : | suxen_drol | 938 | #include "../xvid.h" |
| 31 : | #include "../image/image.h" | ||
| 32 : | |||
| 33 : | edgomez | 994 | #define DEFAULT_INITIAL_QUANTIZER 5 |
| 34 : | suxen_drol | 938 | |
| 35 : | edgomez | 994 | #define DEFAULT_BITRATE 900000 /* 900kbps */ |
| 36 : | #define DEFAULT_MAX_QUANT 31 | ||
| 37 : | #define DEFAULT_MIN_QUANT 2 | ||
| 38 : | #define DEFAULT_DELAY_FACTOR 16 | ||
| 39 : | #define DEFAULT_AVERAGING_PERIOD 100 | ||
| 40 : | #define DEFAULT_BUFFER 100 | ||
| 41 : | suxen_drol | 938 | |
| 42 : | typedef struct | ||
| 43 : | { | ||
| 44 : | edgomez | 994 | int max_quantizer; |
| 45 : | int min_quantizer; | ||
| 46 : | int reaction_delay_factor; | ||
| 47 : | int averaging_period; | ||
| 48 : | int buffer; | ||
| 49 : | suxen_drol | 938 | |
| 50 : | edgomez | 994 | int bytes_per_sec; |
| 51 : | double target_framesize; | ||
| 52 : | |||
| 53 : | double time; | ||
| 54 : | suxen_drol | 938 | int64_t total_size; |
| 55 : | int rtn_quant; | ||
| 56 : | |||
| 57 : | |||
| 58 : | edgomez | 994 | double sequence_quality; |
| 59 : | double avg_framesize; | ||
| 60 : | double quant_error[31]; | ||
| 61 : | } | ||
| 62 : | rc_cbr_t; | ||
| 63 : | suxen_drol | 938 | |
| 64 : | |||
| 65 : | edgomez | 994 | static int |
| 66 : | get_initial_quant(unsigned int bitrate) | ||
| 67 : | { | ||
| 68 : | suxen_drol | 938 | |
| 69 : | edgomez | 994 | #if 0 |
| 70 : | int i; | ||
| 71 : | |||
| 72 : | const unsigned int bitrate_quant[31] = { | ||
| 73 : | UINT_MAX | ||
| 74 : | }; | ||
| 75 : | |||
| 76 : | for (i = 30; i >= 0; i--) { | ||
| 77 : | if (bitrate > bitrate_quant[i]) | ||
| 78 : | continue; | ||
| 79 : | } | ||
| 80 : | |||
| 81 : | return (i + 1); | ||
| 82 : | #else | ||
| 83 : | return (DEFAULT_INITIAL_QUANTIZER); | ||
| 84 : | #endif | ||
| 85 : | } | ||
| 86 : | |||
| 87 : | static int | ||
| 88 : | rc_cbr_create(xvid_plg_create_t * create, | ||
| 89 : | rc_cbr_t ** handle) | ||
| 90 : | suxen_drol | 938 | { |
| 91 : | edgomez | 994 | xvid_plugin_cbr_t *param = (xvid_plugin_cbr_t *) create->param; |
| 92 : | rc_cbr_t *rc; | ||
| 93 : | suxen_drol | 938 | int i; |
| 94 : | |||
| 95 : | edgomez | 994 | /* |
| 96 : | * CBR needs to caclculate the average frame size. In order to do that, | ||
| 97 : | * we really need valid fps | ||
| 98 : | */ | ||
| 99 : | if (create->fincr == 0) { | ||
| 100 : | return XVID_ERR_FAIL; | ||
| 101 : | } | ||
| 102 : | suxen_drol | 938 | |
| 103 : | edgomez | 994 | /* Allocate context struct */ |
| 104 : | if ((rc = malloc(sizeof(rc_cbr_t))) == NULL) | ||
| 105 : | return (XVID_ERR_MEMORY); | ||
| 106 : | suxen_drol | 938 | |
| 107 : | edgomez | 994 | /* Constants */ |
| 108 : | rc->bytes_per_sec = (param->bitrate > 0) ? param->bitrate / 8 : DEFAULT_BITRATE / 8; | ||
| 109 : | rc->target_framesize =(double) rc->bytes_per_sec / ((double) create->fbase / create->fincr); | ||
| 110 : | rc->max_quantizer = (param->max_quantizer > 0) ? param->max_quantizer : DEFAULT_MAX_QUANT; | ||
| 111 : | rc->min_quantizer = (param->min_quantizer > 0) ? param->min_quantizer : DEFAULT_MIN_QUANT; | ||
| 112 : | rc->reaction_delay_factor = (param->reaction_delay_factor > 0) ? param->reaction_delay_factor : DEFAULT_DELAY_FACTOR; | ||
| 113 : | rc->averaging_period = (param->averaging_period > 0) ? param->averaging_period : DEFAULT_AVERAGING_PERIOD; | ||
| 114 : | rc->buffer = (param->buffer > 0) ? param->buffer : DEFAULT_BUFFER; | ||
| 115 : | suxen_drol | 938 | |
| 116 : | edgomez | 994 | rc->time = 0; |
| 117 : | rc->total_size = 0; | ||
| 118 : | rc->rtn_quant = get_initial_quant(param->bitrate); | ||
| 119 : | suxen_drol | 938 | |
| 120 : | /* Reset quant error accumulators */ | ||
| 121 : | for (i = 0; i < 31; i++) | ||
| 122 : | rc->quant_error[i] = 0.0; | ||
| 123 : | |||
| 124 : | /* Last bunch of variables */ | ||
| 125 : | edgomez | 994 | rc->sequence_quality = 2.0 / (double) rc->rtn_quant; |
| 126 : | suxen_drol | 938 | rc->avg_framesize = rc->target_framesize; |
| 127 : | |||
| 128 : | edgomez | 994 | /* Bind the RC */ |
| 129 : | *handle = rc; | ||
| 130 : | |||
| 131 : | /* A bit of debug info */ | ||
| 132 : | DPRINTF(DPRINTF_RC, "bytes_per_sec: %i\n", rc->bytes_per_sec); | ||
| 133 : | DPRINTF(DPRINTF_RC, "frame rate : %f\n", (double) create->fbase / create->fincr); | ||
| 134 : | DPRINTF(DPRINTF_RC, "target_framesize: %f\n", rc->target_framesize); | ||
| 135 : | |||
| 136 : | return (0); | ||
| 137 : | suxen_drol | 938 | } |
| 138 : | |||
| 139 : | |||
| 140 : | edgomez | 994 | static int |
| 141 : | rc_cbr_destroy(rc_cbr_t * rc, | ||
| 142 : | xvid_plg_destroy_t * destroy) | ||
| 143 : | suxen_drol | 938 | { |
| 144 : | free(rc); | ||
| 145 : | edgomez | 994 | return (0); |
| 146 : | suxen_drol | 938 | } |
| 147 : | |||
| 148 : | |||
| 149 : | edgomez | 994 | static int |
| 150 : | rc_cbr_before(rc_cbr_t * rc, | ||
| 151 : | xvid_plg_data_t * data) | ||
| 152 : | suxen_drol | 938 | { |
| 153 : | edgomez | 994 | data->quant = rc->rtn_quant; |
| 154 : | data->type = XVID_TYPE_AUTO; | ||
| 155 : | return 0; | ||
| 156 : | suxen_drol | 938 | } |
| 157 : | |||
| 158 : | |||
| 159 : | edgomez | 994 | static int |
| 160 : | rc_cbr_after(rc_cbr_t * rc, | ||
| 161 : | xvid_plg_data_t * data) | ||
| 162 : | suxen_drol | 938 | { |
| 163 : | int64_t deviation; | ||
| 164 : | int rtn_quant; | ||
| 165 : | double overflow; | ||
| 166 : | double averaging_period; | ||
| 167 : | double reaction_delay_factor; | ||
| 168 : | double quality_scale; | ||
| 169 : | double base_quality; | ||
| 170 : | double target_quality; | ||
| 171 : | |||
| 172 : | edgomez | 994 | |
| 173 : | suxen_drol | 938 | /* Update internal values */ |
| 174 : | edgomez | 994 | rc->time += (double) data->fincr / data->fbase; |
| 175 : | rc->total_size += data->length; | ||
| 176 : | suxen_drol | 938 | |
| 177 : | /* Compute the deviation from expected total size */ | ||
| 178 : | deviation = (int64_t) | ||
| 179 : | edgomez | 994 | ((double) rc->total_size - (double) rc->bytes_per_sec * rc->time); |
| 180 : | suxen_drol | 938 | |
| 181 : | |||
| 182 : | edgomez | 994 | if (rc->rtn_quant >= 2) { |
| 183 : | |||
| 184 : | suxen_drol | 938 | averaging_period = (double) rc->averaging_period; |
| 185 : | |||
| 186 : | edgomez | 994 | rc->sequence_quality -= rc->sequence_quality / averaging_period; |
| 187 : | suxen_drol | 938 | |
| 188 : | rc->sequence_quality += | ||
| 189 : | 2.0 / (double) rc->rtn_quant / averaging_period; | ||
| 190 : | |||
| 191 : | if (rc->sequence_quality < 0.1) | ||
| 192 : | rc->sequence_quality = 0.1; | ||
| 193 : | |||
| 194 : | if (data->type != XVID_TYPE_IVOP) { | ||
| 195 : | reaction_delay_factor = (double) rc->reaction_delay_factor; | ||
| 196 : | rc->avg_framesize -= rc->avg_framesize / reaction_delay_factor; | ||
| 197 : | rc->avg_framesize += data->length / reaction_delay_factor; | ||
| 198 : | } | ||
| 199 : | |||
| 200 : | } | ||
| 201 : | |||
| 202 : | quality_scale = | ||
| 203 : | edgomez | 994 | rc->target_framesize / rc->avg_framesize * rc->target_framesize / |
| 204 : | rc->avg_framesize; | ||
| 205 : | suxen_drol | 938 | |
| 206 : | base_quality = rc->sequence_quality; | ||
| 207 : | if (quality_scale >= 1.0) { | ||
| 208 : | base_quality = 1.0 - (1.0 - base_quality) / quality_scale; | ||
| 209 : | } else { | ||
| 210 : | base_quality = 0.06452 + (base_quality - 0.06452) * quality_scale; | ||
| 211 : | } | ||
| 212 : | |||
| 213 : | overflow = -((double) deviation / (double) rc->buffer); | ||
| 214 : | |||
| 215 : | target_quality = | ||
| 216 : | edgomez | 994 | base_quality + (base_quality - |
| 217 : | 0.06452) * overflow / rc->target_framesize; | ||
| 218 : | suxen_drol | 938 | |
| 219 : | if (target_quality > 2.0) | ||
| 220 : | target_quality = 2.0; | ||
| 221 : | else if (target_quality < 0.06452) | ||
| 222 : | target_quality = 0.06452; | ||
| 223 : | |||
| 224 : | rtn_quant = (int) (2.0 / target_quality); | ||
| 225 : | |||
| 226 : | edgomez | 994 | if (rtn_quant > 0 && rtn_quant < 31) { |
| 227 : | rc->quant_error[rtn_quant - 1] += 2.0 / target_quality - rtn_quant; | ||
| 228 : | if (rc->quant_error[rtn_quant - 1] >= 1.0) { | ||
| 229 : | rc->quant_error[rtn_quant - 1] -= 1.0; | ||
| 230 : | suxen_drol | 938 | rtn_quant++; |
| 231 : | } | ||
| 232 : | } | ||
| 233 : | |||
| 234 : | if (rtn_quant > rc->rtn_quant + 1) | ||
| 235 : | rtn_quant = rc->rtn_quant + 1; | ||
| 236 : | else if (rtn_quant < rc->rtn_quant - 1) | ||
| 237 : | rtn_quant = rc->rtn_quant - 1; | ||
| 238 : | |||
| 239 : | if (rtn_quant > rc->max_quantizer) | ||
| 240 : | rtn_quant = rc->max_quantizer; | ||
| 241 : | else if (rtn_quant < rc->min_quantizer) | ||
| 242 : | rtn_quant = rc->min_quantizer; | ||
| 243 : | |||
| 244 : | rc->rtn_quant = rtn_quant; | ||
| 245 : | |||
| 246 : | edgomez | 994 | return (0); |
| 247 : | suxen_drol | 938 | } |
| 248 : | |||
| 249 : | |||
| 250 : | |||
| 251 : | edgomez | 994 | int |
| 252 : | xvid_plugin_cbr(void *handle, | ||
| 253 : | int opt, | ||
| 254 : | void *param1, | ||
| 255 : | void *param2) | ||
| 256 : | suxen_drol | 938 | { |
| 257 : | edgomez | 994 | switch (opt) { |
| 258 : | case XVID_PLG_INFO: | ||
| 259 : | return 0; | ||
| 260 : | suxen_drol | 938 | |
| 261 : | edgomez | 994 | case XVID_PLG_CREATE: |
| 262 : | return rc_cbr_create((xvid_plg_create_t *) param1, param2); | ||
| 263 : | suxen_drol | 938 | |
| 264 : | edgomez | 994 | case XVID_PLG_DESTROY: |
| 265 : | return rc_cbr_destroy((rc_cbr_t *) handle,(xvid_plg_destroy_t *) param1); | ||
| 266 : | suxen_drol | 938 | |
| 267 : | edgomez | 994 | case XVID_PLG_BEFORE: |
| 268 : | return rc_cbr_before((rc_cbr_t *) handle, (xvid_plg_data_t *) param1); | ||
| 269 : | suxen_drol | 938 | |
| 270 : | edgomez | 994 | case XVID_PLG_AFTER: |
| 271 : | return rc_cbr_after((rc_cbr_t *) handle, (xvid_plg_data_t *) param1); | ||
| 272 : | } | ||
| 273 : | suxen_drol | 938 | |
| 274 : | edgomez | 994 | return XVID_ERR_FAIL; |
| 275 : | suxen_drol | 938 | } |
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