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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 FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 
25 #if HAVE_IO_H
26 #include <io.h>
27 #endif
28 
29 #if HAVE_UNISTD_H
30 #include <unistd.h>
31 #endif
32 
33 #include <xvid.h>
34 
35 #include "libavutil/attributes.h"
36 #include "libavutil/file.h"
37 
38 #include "avcodec.h"
39 #include "libxvid.h"
40 #include "mpegvideo.h"
41 
42 av_cold int ff_xvid_rate_control_init(MpegEncContext *s)
43 {
44  char *tmp_name;
45  int fd, i;
46  xvid_plg_create_t xvid_plg_create = { 0 };
47  xvid_plugin_2pass2_t xvid_2pass2 = { 0 };
48 
49  fd = av_tempfile("xvidrc.", &tmp_name, 0, s->avctx);
50  if (fd == -1) {
51  av_log(NULL, AV_LOG_ERROR, "Can't create temporary pass2 file.\n");
52  return -1;
53  }
54 
55  for (i = 0; i < s->rc_context.num_entries; i++) {
56  static const char frame_types[] = " ipbs";
57  char tmp[256];
58  RateControlEntry *rce;
59 
60  rce = &s->rc_context.entry[i];
61 
62  snprintf(tmp, sizeof(tmp), "%c %d %d %d %d %d %d\n",
63  frame_types[rce->pict_type],
64  (int) lrintf(rce->qscale / FF_QP2LAMBDA),
65  rce->i_count, s->mb_num - rce->i_count - rce->skip_count,
66  rce->skip_count,
67  (rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits + 7) / 8,
68  (rce->header_bits + rce->mv_bits + 7) / 8);
69 
70  if (write(fd, tmp, strlen(tmp)) < 0) {
71  av_log(NULL, AV_LOG_ERROR, "Error %s writing 2pass logfile\n", strerror(errno));
72  av_free(tmp_name);
73  close(fd);
74  return AVERROR(errno);
75  }
76  }
77 
78  close(fd);
79 
80  xvid_2pass2.version = XVID_MAKE_VERSION(1, 1, 0);
81  xvid_2pass2.filename = tmp_name;
82  xvid_2pass2.bitrate = s->avctx->bit_rate;
83  xvid_2pass2.vbv_size = s->avctx->rc_buffer_size;
84  xvid_2pass2.vbv_maxrate = s->avctx->rc_max_rate;
85  xvid_2pass2.vbv_initial = s->avctx->rc_initial_buffer_occupancy;
86 
87  xvid_plg_create.version = XVID_MAKE_VERSION(1, 1, 0);
88  xvid_plg_create.fbase = s->avctx->time_base.den;
89  xvid_plg_create.fincr = s->avctx->time_base.num;
90  xvid_plg_create.param = &xvid_2pass2;
91 
92  if (xvid_plugin_2pass2(NULL, XVID_PLG_CREATE, &xvid_plg_create,
93  &s->rc_context.non_lavc_opaque) < 0) {
94  av_log(NULL, AV_LOG_ERROR, "xvid_plugin_2pass2 failed\n");
95  return -1;
96  }
97  return 0;
98 }
99 
100 float ff_xvid_rate_estimate_qscale(MpegEncContext *s, int dry_run)
101 {
102  xvid_plg_data_t xvid_plg_data = { 0 };
103 
104  xvid_plg_data.version = XVID_MAKE_VERSION(1, 1, 0);
105  xvid_plg_data.width = s->width;
106  xvid_plg_data.height = s->height;
107  xvid_plg_data.mb_width = s->mb_width;
108  xvid_plg_data.mb_height = s->mb_height;
109  xvid_plg_data.fbase = s->avctx->time_base.den;
110  xvid_plg_data.fincr = s->avctx->time_base.num;
111  xvid_plg_data.min_quant[0] = s->avctx->qmin;
112  xvid_plg_data.min_quant[1] = s->avctx->qmin;
113  xvid_plg_data.min_quant[2] = s->avctx->qmin; // FIXME i/b factor & offset
114  xvid_plg_data.max_quant[0] = s->avctx->qmax;
115  xvid_plg_data.max_quant[1] = s->avctx->qmax;
116  xvid_plg_data.max_quant[2] = s->avctx->qmax; // FIXME i/b factor & offset
117  xvid_plg_data.bquant_offset = 0; // 100 * s->avctx->b_quant_offset;
118  xvid_plg_data.bquant_ratio = 100; // * s->avctx->b_quant_factor;
119 
120  if (!s->rc_context.dry_run_qscale) {
121  if (s->picture_number) {
122  xvid_plg_data.length =
123  xvid_plg_data.stats.length = (s->frame_bits + 7) / 8;
124  xvid_plg_data.frame_num = s->rc_context.last_picture_number;
125  xvid_plg_data.quant = s->qscale;
126  xvid_plg_data.type = s->last_pict_type;
127  if (xvid_plugin_2pass2(s->rc_context.non_lavc_opaque,
128  XVID_PLG_AFTER, &xvid_plg_data, NULL)) {
129  av_log(s->avctx, AV_LOG_ERROR,
130  "xvid_plugin_2pass2(handle, XVID_PLG_AFTER, ...) FAILED\n");
131  return -1;
132  }
133  }
134  s->rc_context.last_picture_number =
135  xvid_plg_data.frame_num = s->picture_number;
136  xvid_plg_data.quant = 0;
137  if (xvid_plugin_2pass2(s->rc_context.non_lavc_opaque,
138  XVID_PLG_BEFORE, &xvid_plg_data, NULL)) {
139  av_log(s->avctx, AV_LOG_ERROR,
140  "xvid_plugin_2pass2(handle, XVID_PLG_BEFORE, ...) FAILED\n");
141  return -1;
142  }
143  s->rc_context.dry_run_qscale = xvid_plg_data.quant;
144  }
145  xvid_plg_data.quant = s->rc_context.dry_run_qscale;
146  if (!dry_run)
147  s->rc_context.dry_run_qscale = 0;
148 
149  // FIXME this is not exactly identical to Xvid
150  if (s->pict_type == AV_PICTURE_TYPE_B)
151  return xvid_plg_data.quant * FF_QP2LAMBDA * s->avctx->b_quant_factor +
152  s->avctx->b_quant_offset;
153  else
154  return xvid_plg_data.quant * FF_QP2LAMBDA;
155 }
156 
157 av_cold void ff_xvid_rate_control_uninit(MpegEncContext *s)
158 {
159  xvid_plg_destroy_t xvid_plg_destroy;
160 
161  xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_DESTROY,
162  &xvid_plg_destroy, NULL);
163 }
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