2 * Xvid rate control wrapper for lavc video encoders
4 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * Libav 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 GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "libavutil/attributes.h"
33 #include "mpegvideo.h"
38 /* Wrapper to work around the lack of mkstemp() on mingw.
39 * Also, tries to create file in /tmp first, if possible.
40 * *prefix can be a character constant; *filename will be allocated internally.
41 * @return file descriptor of opened file (or -1 on error)
42 * and opened file name in **filename. */
43 int ff_tempfile(const char *prefix, char **filename) {
46 *filename = tempnam(".", prefix);
48 size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
49 *filename = av_malloc(len);
51 /* -----common section-----*/
52 if (*filename == NULL) {
53 av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
57 fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
59 snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
60 fd = mkstemp(*filename);
62 snprintf(*filename, len, "./%sXXXXXX", prefix);
63 fd = mkstemp(*filename);
66 /* -----common section-----*/
68 av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
71 return fd; /* success */
74 av_cold int ff_xvid_rate_control_init(MpegEncContext *s)
78 xvid_plg_create_t xvid_plg_create = { 0 };
79 xvid_plugin_2pass2_t xvid_2pass2 = { 0 };
81 fd=ff_tempfile("xvidrc.", &tmp_name);
83 av_log(NULL, AV_LOG_ERROR, "Can't create temporary pass2 file.\n");
87 for(i=0; i<s->rc_context.num_entries; i++){
88 static const char frame_types[] = " ipbs";
90 RateControlEntry *rce;
92 rce= &s->rc_context.entry[i];
94 snprintf(tmp, sizeof(tmp), "%c %d %d %d %d %d %d\n",
95 frame_types[rce->pict_type], (int)lrintf(rce->qscale / FF_QP2LAMBDA), rce->i_count, s->mb_num - rce->i_count - rce->skip_count,
96 rce->skip_count, (rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits+7)/8, (rce->header_bits+rce->mv_bits+7)/8);
98 write(fd, tmp, strlen(tmp));
103 xvid_2pass2.version= XVID_MAKE_VERSION(1,1,0);
104 xvid_2pass2.filename= tmp_name;
105 xvid_2pass2.bitrate= s->avctx->bit_rate;
106 xvid_2pass2.vbv_size= s->avctx->rc_buffer_size;
107 xvid_2pass2.vbv_maxrate= s->avctx->rc_max_rate;
108 xvid_2pass2.vbv_initial= s->avctx->rc_initial_buffer_occupancy;
110 xvid_plg_create.version= XVID_MAKE_VERSION(1,1,0);
111 xvid_plg_create.fbase= s->avctx->time_base.den;
112 xvid_plg_create.fincr= s->avctx->time_base.num;
113 xvid_plg_create.param= &xvid_2pass2;
115 if(xvid_plugin_2pass2(NULL, XVID_PLG_CREATE, &xvid_plg_create, &s->rc_context.non_lavc_opaque)<0){
116 av_log(NULL, AV_LOG_ERROR, "xvid_plugin_2pass2 failed\n");
122 float ff_xvid_rate_estimate_qscale(MpegEncContext *s, int dry_run){
123 xvid_plg_data_t xvid_plg_data = { 0 };
125 xvid_plg_data.version= XVID_MAKE_VERSION(1,1,0);
126 xvid_plg_data.width = s->width;
127 xvid_plg_data.height= s->height;
128 xvid_plg_data.mb_width = s->mb_width;
129 xvid_plg_data.mb_height= s->mb_height;
130 xvid_plg_data.fbase= s->avctx->time_base.den;
131 xvid_plg_data.fincr= s->avctx->time_base.num;
132 xvid_plg_data.min_quant[0]= s->avctx->qmin;
133 xvid_plg_data.min_quant[1]= s->avctx->qmin;
134 xvid_plg_data.min_quant[2]= s->avctx->qmin; //FIXME i/b factor & offset
135 xvid_plg_data.max_quant[0]= s->avctx->qmax;
136 xvid_plg_data.max_quant[1]= s->avctx->qmax;
137 xvid_plg_data.max_quant[2]= s->avctx->qmax; //FIXME i/b factor & offset
138 xvid_plg_data.bquant_offset = 0; // 100 * s->avctx->b_quant_offset;
139 xvid_plg_data.bquant_ratio = 100; // * s->avctx->b_quant_factor;
141 if(!s->rc_context.dry_run_qscale){
142 if(s->picture_number){
143 xvid_plg_data.length=
144 xvid_plg_data.stats.length= (s->frame_bits + 7)/8;
145 xvid_plg_data.frame_num= s->rc_context.last_picture_number;
146 xvid_plg_data.quant= s->qscale;
148 xvid_plg_data.type= s->last_pict_type;
149 if(xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_AFTER, &xvid_plg_data, NULL)){
150 av_log(s->avctx, AV_LOG_ERROR, "xvid_plugin_2pass2(handle, XVID_PLG_AFTER, ...) FAILED\n");
154 s->rc_context.last_picture_number=
155 xvid_plg_data.frame_num= s->picture_number;
156 xvid_plg_data.quant= 0;
157 if(xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_BEFORE, &xvid_plg_data, NULL)){
158 av_log(s->avctx, AV_LOG_ERROR, "xvid_plugin_2pass2(handle, XVID_PLG_BEFORE, ...) FAILED\n");
161 s->rc_context.dry_run_qscale= xvid_plg_data.quant;
163 xvid_plg_data.quant= s->rc_context.dry_run_qscale;
165 s->rc_context.dry_run_qscale= 0;
167 if(s->pict_type == AV_PICTURE_TYPE_B) //FIXME this is not exactly identical to xvid
168 return xvid_plg_data.quant * FF_QP2LAMBDA * s->avctx->b_quant_factor + s->avctx->b_quant_offset;
170 return xvid_plg_data.quant * FF_QP2LAMBDA;
173 av_cold void ff_xvid_rate_control_uninit(MpegEncContext *s)
175 xvid_plg_destroy_t xvid_plg_destroy;
177 xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_DESTROY, &xvid_plg_destroy, NULL);