libxvid_rc.c
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1 /*
2  * Xvid rate control wrapper for lavc video encoders
3  *
4  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
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.
12  *
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.
17  *
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
21  */
22 
23 #include "config.h"
24 #include <xvid.h>
25 #include <unistd.h>
26 #if !HAVE_MKSTEMP
27 #include <fcntl.h>
28 #endif
29 
30 #include "avcodec.h"
31 #include "libxvid.h"
32 //#include "dsputil.h"
33 #include "mpegvideo.h"
34 
35 #undef NDEBUG
36 #include <assert.h>
37 
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) {
44  int fd=-1;
45 #if !HAVE_MKSTEMP
46  *filename = tempnam(".", prefix);
47 #else
48  size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
49  *filename = av_malloc(len);
50 #endif
51  /* -----common section-----*/
52  if (*filename == NULL) {
53  av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
54  return -1;
55  }
56 #if !HAVE_MKSTEMP
57  fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
58 #else
59  snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
60  fd = mkstemp(*filename);
61  if (fd < 0) {
62  snprintf(*filename, len, "./%sXXXXXX", prefix);
63  fd = mkstemp(*filename);
64  }
65 #endif
66  /* -----common section-----*/
67  if (fd < 0) {
68  av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
69  return -1;
70  }
71  return fd; /* success */
72 }
73 
75  char *tmp_name;
76  int fd, i;
77  xvid_plg_create_t xvid_plg_create = { 0 };
78  xvid_plugin_2pass2_t xvid_2pass2 = { 0 };
79 
80  fd=ff_tempfile("xvidrc.", &tmp_name);
81  if (fd == -1) {
82  av_log(NULL, AV_LOG_ERROR, "Can't create temporary pass2 file.\n");
83  return -1;
84  }
85 
86  for(i=0; i<s->rc_context.num_entries; i++){
87  static const char frame_types[] = " ipbs";
88  char tmp[256];
89  RateControlEntry *rce;
90 
91  rce= &s->rc_context.entry[i];
92 
93  snprintf(tmp, sizeof(tmp), "%c %d %d %d %d %d %d\n",
94  frame_types[rce->pict_type], (int)lrintf(rce->qscale / FF_QP2LAMBDA), rce->i_count, s->mb_num - rce->i_count - rce->skip_count,
95  rce->skip_count, (rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits+7)/8, (rce->header_bits+rce->mv_bits+7)/8);
96 
97  write(fd, tmp, strlen(tmp));
98  }
99 
100  close(fd);
101 
102  xvid_2pass2.version= XVID_MAKE_VERSION(1,1,0);
103  xvid_2pass2.filename= tmp_name;
104  xvid_2pass2.bitrate= s->avctx->bit_rate;
105  xvid_2pass2.vbv_size= s->avctx->rc_buffer_size;
106  xvid_2pass2.vbv_maxrate= s->avctx->rc_max_rate;
107  xvid_2pass2.vbv_initial= s->avctx->rc_initial_buffer_occupancy;
108 
109  xvid_plg_create.version= XVID_MAKE_VERSION(1,1,0);
110  xvid_plg_create.fbase= s->avctx->time_base.den;
111  xvid_plg_create.fincr= s->avctx->time_base.num;
112  xvid_plg_create.param= &xvid_2pass2;
113 
114  if(xvid_plugin_2pass2(NULL, XVID_PLG_CREATE, &xvid_plg_create, &s->rc_context.non_lavc_opaque)<0){
115  av_log(NULL, AV_LOG_ERROR, "xvid_plugin_2pass2 failed\n");
116  return -1;
117  }
118  return 0;
119 }
120 
122  xvid_plg_data_t xvid_plg_data = { 0 };
123 
124  xvid_plg_data.version= XVID_MAKE_VERSION(1,1,0);
125  xvid_plg_data.width = s->width;
126  xvid_plg_data.height= s->height;
127  xvid_plg_data.mb_width = s->mb_width;
128  xvid_plg_data.mb_height= s->mb_height;
129  xvid_plg_data.fbase= s->avctx->time_base.den;
130  xvid_plg_data.fincr= s->avctx->time_base.num;
131  xvid_plg_data.min_quant[0]= s->avctx->qmin;
132  xvid_plg_data.min_quant[1]= s->avctx->qmin;
133  xvid_plg_data.min_quant[2]= s->avctx->qmin; //FIXME i/b factor & offset
134  xvid_plg_data.max_quant[0]= s->avctx->qmax;
135  xvid_plg_data.max_quant[1]= s->avctx->qmax;
136  xvid_plg_data.max_quant[2]= s->avctx->qmax; //FIXME i/b factor & offset
137  xvid_plg_data.bquant_offset = 0; // 100 * s->avctx->b_quant_offset;
138  xvid_plg_data.bquant_ratio = 100; // * s->avctx->b_quant_factor;
139 
140  if(!s->rc_context.dry_run_qscale){
141  if(s->picture_number){
142  xvid_plg_data.length=
143  xvid_plg_data.stats.length= (s->frame_bits + 7)/8;
144  xvid_plg_data.frame_num= s->rc_context.last_picture_number;
145  xvid_plg_data.quant= s->qscale;
146 
147  xvid_plg_data.type= s->last_pict_type;
148  if(xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_AFTER, &xvid_plg_data, NULL)){
149  av_log(s->avctx, AV_LOG_ERROR, "xvid_plugin_2pass2(handle, XVID_PLG_AFTER, ...) FAILED\n");
150  return -1;
151  }
152  }
154  xvid_plg_data.frame_num= s->picture_number;
155  xvid_plg_data.quant= 0;
156  if(xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_BEFORE, &xvid_plg_data, NULL)){
157  av_log(s->avctx, AV_LOG_ERROR, "xvid_plugin_2pass2(handle, XVID_PLG_BEFORE, ...) FAILED\n");
158  return -1;
159  }
160  s->rc_context.dry_run_qscale= xvid_plg_data.quant;
161  }
162  xvid_plg_data.quant= s->rc_context.dry_run_qscale;
163  if(!dry_run)
165 
166  if(s->pict_type == AV_PICTURE_TYPE_B) //FIXME this is not exactly identical to xvid
167  return xvid_plg_data.quant * FF_QP2LAMBDA * s->avctx->b_quant_factor + s->avctx->b_quant_offset;
168  else
169  return xvid_plg_data.quant * FF_QP2LAMBDA;
170 }
171 
173  xvid_plg_destroy_t xvid_plg_destroy;
174 
175  xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_DESTROY, &xvid_plg_destroy, NULL);
176 }