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"
31 #include "libavutil/internal.h"
34 #include "mpegvideo.h"
39 /* Wrapper to work around the lack of mkstemp() on mingw.
40 * Also, tries to create file in /tmp first, if possible.
41 * *prefix can be a character constant; *filename will be allocated internally.
42 * @return file descriptor of opened file (or -1 on error)
43 * and opened file name in **filename. */
44 int ff_tempfile(const char *prefix, char **filename) {
47 *filename = tempnam(".", prefix);
49 size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
50 *filename = av_malloc(len);
52 /* -----common section-----*/
53 if (*filename == NULL) {
54 av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
58 fd = avpriv_open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
60 snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
61 fd = mkstemp(*filename);
63 snprintf(*filename, len, "./%sXXXXXX", prefix);
64 fd = mkstemp(*filename);
67 /* -----common section-----*/
69 av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
72 return fd; /* success */
75 av_cold int ff_xvid_rate_control_init(MpegEncContext *s)
79 xvid_plg_create_t xvid_plg_create = { 0 };
80 xvid_plugin_2pass2_t xvid_2pass2 = { 0 };
82 fd=ff_tempfile("xvidrc.", &tmp_name);
84 av_log(NULL, AV_LOG_ERROR, "Can't create temporary pass2 file.\n");
88 for(i=0; i<s->rc_context.num_entries; i++){
89 static const char frame_types[] = " ipbs";
91 RateControlEntry *rce;
93 rce= &s->rc_context.entry[i];
95 snprintf(tmp, sizeof(tmp), "%c %d %d %d %d %d %d\n",
96 frame_types[rce->pict_type], (int)lrintf(rce->qscale / FF_QP2LAMBDA), rce->i_count, s->mb_num - rce->i_count - rce->skip_count,
97 rce->skip_count, (rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits+7)/8, (rce->header_bits+rce->mv_bits+7)/8);
99 write(fd, tmp, strlen(tmp));
104 xvid_2pass2.version= XVID_MAKE_VERSION(1,1,0);
105 xvid_2pass2.filename= tmp_name;
106 xvid_2pass2.bitrate= s->avctx->bit_rate;
107 xvid_2pass2.vbv_size= s->avctx->rc_buffer_size;
108 xvid_2pass2.vbv_maxrate= s->avctx->rc_max_rate;
109 xvid_2pass2.vbv_initial= s->avctx->rc_initial_buffer_occupancy;
111 xvid_plg_create.version= XVID_MAKE_VERSION(1,1,0);
112 xvid_plg_create.fbase= s->avctx->time_base.den;
113 xvid_plg_create.fincr= s->avctx->time_base.num;
114 xvid_plg_create.param= &xvid_2pass2;
116 if(xvid_plugin_2pass2(NULL, XVID_PLG_CREATE, &xvid_plg_create, &s->rc_context.non_lavc_opaque)<0){
117 av_log(NULL, AV_LOG_ERROR, "xvid_plugin_2pass2 failed\n");
123 float ff_xvid_rate_estimate_qscale(MpegEncContext *s, int dry_run){
124 xvid_plg_data_t xvid_plg_data = { 0 };
126 xvid_plg_data.version= XVID_MAKE_VERSION(1,1,0);
127 xvid_plg_data.width = s->width;
128 xvid_plg_data.height= s->height;
129 xvid_plg_data.mb_width = s->mb_width;
130 xvid_plg_data.mb_height= s->mb_height;
131 xvid_plg_data.fbase= s->avctx->time_base.den;
132 xvid_plg_data.fincr= s->avctx->time_base.num;
133 xvid_plg_data.min_quant[0]= s->avctx->qmin;
134 xvid_plg_data.min_quant[1]= s->avctx->qmin;
135 xvid_plg_data.min_quant[2]= s->avctx->qmin; //FIXME i/b factor & offset
136 xvid_plg_data.max_quant[0]= s->avctx->qmax;
137 xvid_plg_data.max_quant[1]= s->avctx->qmax;
138 xvid_plg_data.max_quant[2]= s->avctx->qmax; //FIXME i/b factor & offset
139 xvid_plg_data.bquant_offset = 0; // 100 * s->avctx->b_quant_offset;
140 xvid_plg_data.bquant_ratio = 100; // * s->avctx->b_quant_factor;
142 if(!s->rc_context.dry_run_qscale){
143 if(s->picture_number){
144 xvid_plg_data.length=
145 xvid_plg_data.stats.length= (s->frame_bits + 7)/8;
146 xvid_plg_data.frame_num= s->rc_context.last_picture_number;
147 xvid_plg_data.quant= s->qscale;
149 xvid_plg_data.type= s->last_pict_type;
150 if(xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_AFTER, &xvid_plg_data, NULL)){
151 av_log(s->avctx, AV_LOG_ERROR, "xvid_plugin_2pass2(handle, XVID_PLG_AFTER, ...) FAILED\n");
155 s->rc_context.last_picture_number=
156 xvid_plg_data.frame_num= s->picture_number;
157 xvid_plg_data.quant= 0;
158 if(xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_BEFORE, &xvid_plg_data, NULL)){
159 av_log(s->avctx, AV_LOG_ERROR, "xvid_plugin_2pass2(handle, XVID_PLG_BEFORE, ...) FAILED\n");
162 s->rc_context.dry_run_qscale= xvid_plg_data.quant;
164 xvid_plg_data.quant= s->rc_context.dry_run_qscale;
166 s->rc_context.dry_run_qscale= 0;
168 if(s->pict_type == AV_PICTURE_TYPE_B) //FIXME this is not exactly identical to xvid
169 return xvid_plg_data.quant * FF_QP2LAMBDA * s->avctx->b_quant_factor + s->avctx->b_quant_offset;
171 return xvid_plg_data.quant * FF_QP2LAMBDA;
174 av_cold void ff_xvid_rate_control_uninit(MpegEncContext *s)
176 xvid_plg_destroy_t xvid_plg_destroy;
178 xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_DESTROY, &xvid_plg_destroy, NULL);