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Revision 938 - (view) (download)
| 1 : | suxen_drol | 938 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | * XviD VBR Library | ||
| 4 : | * - CBR/ABR bitrate controller implementation - | ||
| 5 : | * | ||
| 6 : | * Copyright (C) 2002 Edouard Gomez <ed.gomez@wanadoo.fr> | ||
| 7 : | * | ||
| 8 : | * This program is free software; you can redistribute it and/or modify | ||
| 9 : | * it under the terms of the GNU General Public License as published by | ||
| 10 : | * the Free Software Foundation; either version 2 of the License, or | ||
| 11 : | * (at your option) any later version. | ||
| 12 : | * | ||
| 13 : | * This program is distributed in the hope that it will be useful, | ||
| 14 : | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 16 : | * GNU General Public License for more details. | ||
| 17 : | * | ||
| 18 : | * You should have received a copy of the GNU General Public License | ||
| 19 : | * along with this program; if not, write to the Free Software | ||
| 20 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 21 : | * | ||
| 22 : | * $Id: plugin_cbr.c,v 1.1.2.1 2003-03-23 04:03:01 suxen_drol Exp $ | ||
| 23 : | * | ||
| 24 : | ****************************************************************************/ | ||
| 25 : | |||
| 26 : | |||
| 27 : | #include "../xvid.h" | ||
| 28 : | #include "../image/image.h" | ||
| 29 : | |||
| 30 : | #define INITIAL_QUANT 5 | ||
| 31 : | |||
| 32 : | |||
| 33 : | typedef struct | ||
| 34 : | { | ||
| 35 : | int max_quantizer; | ||
| 36 : | int min_quantizer; | ||
| 37 : | int reaction_delay_factor; | ||
| 38 : | int averaging_period; | ||
| 39 : | int buffer; | ||
| 40 : | |||
| 41 : | int bytes_per_sec; | ||
| 42 : | double target_framesize; | ||
| 43 : | |||
| 44 : | double time; | ||
| 45 : | int64_t total_size; | ||
| 46 : | int rtn_quant; | ||
| 47 : | |||
| 48 : | |||
| 49 : | double sequence_quality; | ||
| 50 : | double avg_framesize; | ||
| 51 : | double quant_error[31]; | ||
| 52 : | } rc_cbr_t; | ||
| 53 : | |||
| 54 : | |||
| 55 : | |||
| 56 : | static int rc_cbr_create(xvid_plg_create_t * create, rc_cbr_t ** handle) | ||
| 57 : | { | ||
| 58 : | xvid_plugin_cbr_t * param = (xvid_plugin_cbr_t *)create->param; | ||
| 59 : | rc_cbr_t * rc; | ||
| 60 : | int i; | ||
| 61 : | |||
| 62 : | /* cbr need to caclulate the average frame size. in order to do that, we need some fps */ | ||
| 63 : | if (create->fincr == 0) { | ||
| 64 : | return XVID_ERR_FAIL; | ||
| 65 : | } | ||
| 66 : | |||
| 67 : | /* allocate context struct */ | ||
| 68 : | if((rc = malloc(sizeof(rc_cbr_t))) == NULL) | ||
| 69 : | return(XVID_ERR_MEMORY); | ||
| 70 : | |||
| 71 : | /* constants */ | ||
| 72 : | rc->bytes_per_sec = param->bitrate / 8; | ||
| 73 : | rc->target_framesize = (double)rc->bytes_per_sec / ((double)create->fbase / create->fincr); | ||
| 74 : | rc->max_quantizer = param->max_quantizer>0 ? param->max_quantizer : 12; | ||
| 75 : | rc->min_quantizer = param->min_quantizer>0 ? param->min_quantizer : 2; | ||
| 76 : | rc->reaction_delay_factor = param->reaction_delay_factor>0 ? param->reaction_delay_factor : 16; | ||
| 77 : | rc->averaging_period = param->averaging_period>0 ? param->averaging_period : 100; | ||
| 78 : | rc->buffer = param->buffer>0 ? param->buffer : 100; | ||
| 79 : | |||
| 80 : | rc->time = 0; | ||
| 81 : | rc->total_size = 0; | ||
| 82 : | rc->rtn_quant = INITIAL_QUANT; | ||
| 83 : | |||
| 84 : | /* Reset quant error accumulators */ | ||
| 85 : | for (i = 0; i < 31; i++) | ||
| 86 : | rc->quant_error[i] = 0.0; | ||
| 87 : | |||
| 88 : | /* Last bunch of variables */ | ||
| 89 : | |||
| 90 : | printf("bytes_per_sec: %i\n", rc->bytes_per_sec); | ||
| 91 : | printf("frame rate : %f\n", (double)create->fbase / create->fincr); | ||
| 92 : | printf("target_framesize: %f\n",rc->target_framesize); | ||
| 93 : | |||
| 94 : | rc->sequence_quality = 2.0 / (double) rc->rtn_quant; | ||
| 95 : | rc->avg_framesize = rc->target_framesize; | ||
| 96 : | |||
| 97 : | *handle = rc; | ||
| 98 : | return(0); | ||
| 99 : | } | ||
| 100 : | |||
| 101 : | |||
| 102 : | static int rc_cbr_destroy(rc_cbr_t * rc, xvid_plg_destroy_t * destroy) | ||
| 103 : | { | ||
| 104 : | free(rc); | ||
| 105 : | return(0); | ||
| 106 : | } | ||
| 107 : | |||
| 108 : | |||
| 109 : | static int rc_cbr_before(rc_cbr_t * rc, xvid_plg_data_t * data) | ||
| 110 : | { | ||
| 111 : | data->quant = rc->rtn_quant; | ||
| 112 : | data->type = XVID_TYPE_AUTO; | ||
| 113 : | return 0; | ||
| 114 : | } | ||
| 115 : | |||
| 116 : | |||
| 117 : | static int rc_cbr_after(rc_cbr_t * rc, xvid_plg_data_t * data) | ||
| 118 : | { | ||
| 119 : | int64_t deviation; | ||
| 120 : | int rtn_quant; | ||
| 121 : | double overflow; | ||
| 122 : | double averaging_period; | ||
| 123 : | double reaction_delay_factor; | ||
| 124 : | double quality_scale; | ||
| 125 : | double base_quality; | ||
| 126 : | double target_quality; | ||
| 127 : | |||
| 128 : | |||
| 129 : | /* Update internal values */ | ||
| 130 : | rc->time += (double)data->fincr / data->fbase; | ||
| 131 : | rc->total_size += data->length; | ||
| 132 : | |||
| 133 : | /* Compute the deviation from expected total size */ | ||
| 134 : | deviation = (int64_t) | ||
| 135 : | ((double)rc->total_size - (double)rc->bytes_per_sec*rc->time); | ||
| 136 : | |||
| 137 : | |||
| 138 : | if(rc->rtn_quant >= 2) { | ||
| 139 : | |||
| 140 : | averaging_period = (double) rc->averaging_period; | ||
| 141 : | |||
| 142 : | rc->sequence_quality -= | ||
| 143 : | rc->sequence_quality / averaging_period; | ||
| 144 : | |||
| 145 : | rc->sequence_quality += | ||
| 146 : | 2.0 / (double) rc->rtn_quant / averaging_period; | ||
| 147 : | |||
| 148 : | if (rc->sequence_quality < 0.1) | ||
| 149 : | rc->sequence_quality = 0.1; | ||
| 150 : | |||
| 151 : | if (data->type != XVID_TYPE_IVOP) { | ||
| 152 : | reaction_delay_factor = (double) rc->reaction_delay_factor; | ||
| 153 : | rc->avg_framesize -= rc->avg_framesize / reaction_delay_factor; | ||
| 154 : | rc->avg_framesize += data->length / reaction_delay_factor; | ||
| 155 : | } | ||
| 156 : | |||
| 157 : | } | ||
| 158 : | |||
| 159 : | quality_scale = | ||
| 160 : | rc->target_framesize / rc->avg_framesize * | ||
| 161 : | rc->target_framesize / rc->avg_framesize; | ||
| 162 : | |||
| 163 : | base_quality = rc->sequence_quality; | ||
| 164 : | if (quality_scale >= 1.0) { | ||
| 165 : | base_quality = 1.0 - (1.0 - base_quality) / quality_scale; | ||
| 166 : | } else { | ||
| 167 : | base_quality = 0.06452 + (base_quality - 0.06452) * quality_scale; | ||
| 168 : | } | ||
| 169 : | |||
| 170 : | overflow = -((double) deviation / (double) rc->buffer); | ||
| 171 : | |||
| 172 : | target_quality = | ||
| 173 : | base_quality + | ||
| 174 : | (base_quality - 0.06452) * overflow / rc->target_framesize; | ||
| 175 : | |||
| 176 : | if (target_quality > 2.0) | ||
| 177 : | target_quality = 2.0; | ||
| 178 : | else if (target_quality < 0.06452) | ||
| 179 : | target_quality = 0.06452; | ||
| 180 : | |||
| 181 : | rtn_quant = (int) (2.0 / target_quality); | ||
| 182 : | |||
| 183 : | if (rtn_quant < 31) { | ||
| 184 : | rc->quant_error[rtn_quant-1] += | ||
| 185 : | 2.0 / target_quality - rtn_quant; | ||
| 186 : | if (rc->quant_error[rtn_quant-1] >= 1.0) { | ||
| 187 : | rc->quant_error[rtn_quant-1] -= 1.0; | ||
| 188 : | rtn_quant++; | ||
| 189 : | } | ||
| 190 : | } | ||
| 191 : | |||
| 192 : | if (rtn_quant > rc->rtn_quant + 1) | ||
| 193 : | rtn_quant = rc->rtn_quant + 1; | ||
| 194 : | else if (rtn_quant < rc->rtn_quant - 1) | ||
| 195 : | rtn_quant = rc->rtn_quant - 1; | ||
| 196 : | |||
| 197 : | if (rtn_quant > rc->max_quantizer) | ||
| 198 : | rtn_quant = rc->max_quantizer; | ||
| 199 : | else if (rtn_quant < rc->min_quantizer) | ||
| 200 : | rtn_quant = rc->min_quantizer; | ||
| 201 : | |||
| 202 : | rc->rtn_quant = rtn_quant; | ||
| 203 : | |||
| 204 : | return(0); | ||
| 205 : | } | ||
| 206 : | |||
| 207 : | |||
| 208 : | |||
| 209 : | int xvid_plugin_cbr(void * handle, int opt, void * param1, void * param2) | ||
| 210 : | { | ||
| 211 : | switch(opt) | ||
| 212 : | { | ||
| 213 : | case XVID_PLG_INFO : | ||
| 214 : | return 0; | ||
| 215 : | |||
| 216 : | case XVID_PLG_CREATE : | ||
| 217 : | return rc_cbr_create((xvid_plg_create_t*)param1, param2); | ||
| 218 : | |||
| 219 : | case XVID_PLG_DESTROY : | ||
| 220 : | return rc_cbr_destroy((rc_cbr_t*)handle, (xvid_plg_destroy_t*)param1); | ||
| 221 : | |||
| 222 : | case XVID_PLG_BEFORE : | ||
| 223 : | return rc_cbr_before((rc_cbr_t*)handle, (xvid_plg_data_t*)param1); | ||
| 224 : | |||
| 225 : | case XVID_PLG_AFTER : | ||
| 226 : | return rc_cbr_after((rc_cbr_t*)handle, (xvid_plg_data_t*)param1); | ||
| 227 : | } | ||
| 228 : | |||
| 229 : | return XVID_ERR_FAIL; | ||
| 230 : | } | ||
| 231 : |
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