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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/internal.h"
37 
38 #include "avcodec.h"
39 #include "libxvid.h"
40 #include "mpegvideo.h"
41 
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 = avpriv_tempfile("xvidrc.", &tmp_name, 0, s->avctx);
50  if (fd < 0) {
51  av_log(NULL, AV_LOG_ERROR, "Can't create temporary pass2 file.\n");
52  return fd;
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  int ret = AVERROR(errno);
72  av_log(NULL, AV_LOG_ERROR, "Error %s writing 2pass logfile\n", av_err2str(ret));
73  av_free(tmp_name);
74  close(fd);
75  return ret;
76  }
77  }
78 
79  close(fd);
80 
81  xvid_2pass2.version = XVID_MAKE_VERSION(1, 1, 0);
82  xvid_2pass2.filename = tmp_name;
83  xvid_2pass2.bitrate = s->avctx->bit_rate;
84  xvid_2pass2.vbv_size = s->avctx->rc_buffer_size;
85  xvid_2pass2.vbv_maxrate = s->avctx->rc_max_rate;
86  xvid_2pass2.vbv_initial = s->avctx->rc_initial_buffer_occupancy;
87 
88  xvid_plg_create.version = XVID_MAKE_VERSION(1, 1, 0);
89  xvid_plg_create.fbase = s->avctx->time_base.den;
90  xvid_plg_create.fincr = s->avctx->time_base.num;
91  xvid_plg_create.param = &xvid_2pass2;
92 
93  if (xvid_plugin_2pass2(NULL, XVID_PLG_CREATE, &xvid_plg_create,
94  &s->rc_context.non_lavc_opaque) < 0) {
95  av_log(NULL, AV_LOG_ERROR, "xvid_plugin_2pass2 failed\n");
96  return -1;
97  }
98  return 0;
99 }
100 
102 {
103  xvid_plg_data_t xvid_plg_data = { 0 };
104 
105  xvid_plg_data.version = XVID_MAKE_VERSION(1, 1, 0);
106  xvid_plg_data.width = s->width;
107  xvid_plg_data.height = s->height;
108  xvid_plg_data.mb_width = s->mb_width;
109  xvid_plg_data.mb_height = s->mb_height;
110  xvid_plg_data.fbase = s->avctx->time_base.den;
111  xvid_plg_data.fincr = s->avctx->time_base.num;
112  xvid_plg_data.min_quant[0] = s->avctx->qmin;
113  xvid_plg_data.min_quant[1] = s->avctx->qmin;
114  xvid_plg_data.min_quant[2] = s->avctx->qmin; // FIXME i/b factor & offset
115  xvid_plg_data.max_quant[0] = s->avctx->qmax;
116  xvid_plg_data.max_quant[1] = s->avctx->qmax;
117  xvid_plg_data.max_quant[2] = s->avctx->qmax; // FIXME i/b factor & offset
118  xvid_plg_data.bquant_offset = 0; // 100 * s->avctx->b_quant_offset;
119  xvid_plg_data.bquant_ratio = 100; // * s->avctx->b_quant_factor;
120 
121  if (!s->rc_context.dry_run_qscale) {
122  if (s->picture_number) {
123  xvid_plg_data.length =
124  xvid_plg_data.stats.length = (s->frame_bits + 7) / 8;
125  xvid_plg_data.frame_num = s->rc_context.last_picture_number;
126  xvid_plg_data.quant = s->qscale;
127  xvid_plg_data.type = s->last_pict_type;
128  if (xvid_plugin_2pass2(s->rc_context.non_lavc_opaque,
129  XVID_PLG_AFTER, &xvid_plg_data, NULL)) {
131  "xvid_plugin_2pass2(handle, XVID_PLG_AFTER, ...) FAILED\n");
132  return -1;
133  }
134  }
136  xvid_plg_data.frame_num = s->picture_number;
137  xvid_plg_data.quant = 0;
138  if (xvid_plugin_2pass2(s->rc_context.non_lavc_opaque,
139  XVID_PLG_BEFORE, &xvid_plg_data, NULL)) {
141  "xvid_plugin_2pass2(handle, XVID_PLG_BEFORE, ...) FAILED\n");
142  return -1;
143  }
144  s->rc_context.dry_run_qscale = xvid_plg_data.quant;
145  }
146  xvid_plg_data.quant = s->rc_context.dry_run_qscale;
147  if (!dry_run)
148  s->rc_context.dry_run_qscale = 0;
149 
150  // FIXME this is not exactly identical to Xvid
151  if (s->pict_type == AV_PICTURE_TYPE_B)
152  return xvid_plg_data.quant * FF_QP2LAMBDA * s->avctx->b_quant_factor +
153  s->avctx->b_quant_offset;
154  else
155  return xvid_plg_data.quant * FF_QP2LAMBDA;
156 }
157 
159 {
160  xvid_plg_destroy_t xvid_plg_destroy;
161 
162  xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_DESTROY,
163  &xvid_plg_destroy, NULL);
164 }
int frame_bits
bits used for the current frame
Definition: mpegvideo.h:338
#define NULL
Definition: coverity.c:32
RateControlContext rc_context
contains stuff only accessed in ratecontrol.c
Definition: mpegvideo.h:341
int picture_number
Definition: mpegvideo.h:124
const char * s
Definition: avisynth_c.h:631
RateControlEntry * entry
Definition: ratecontrol.h:65
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1722
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:2695
int num
numerator
Definition: rational.h:44
int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx)
Wrapper to work around the lack of mkstemp() on mingw.
Definition: file_open.c:106
mpegvideo header.
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:130
int qscale
QP.
Definition: mpegvideo.h:201
Macro definitions for various function/variable attributes.
common functions for use with the Xvid wrappers
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1794
#define av_cold
Definition: attributes.h:82
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:1952
#define lrintf(x)
Definition: libm_mips.h:70
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
int num_entries
number of RateControlEntries
Definition: ratecontrol.h:64
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
int qmax
maximum quantizer
Definition: avcodec.h:2606
av_cold void ff_xvid_rate_control_uninit(MpegEncContext *s)
Definition: libxvid_rc.c:158
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2633
float dry_run_qscale
for xvid rc
Definition: ratecontrol.h:84
common internal API header
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
Libavcodec external API header.
int qmin
minimum quantizer
Definition: avcodec.h:2599
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
int last_picture_number
for xvid rc
Definition: ratecontrol.h:85
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1971
#define snprintf
Definition: snprintf.h:34
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
MpegEncContext.
Definition: mpegvideo.h:78
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
void * non_lavc_opaque
context for non lavc rc code (for example xvid)
Definition: ratecontrol.h:83
av_cold int ff_xvid_rate_control_init(MpegEncContext *s)
Definition: libxvid_rc.c:42
int last_pict_type
Definition: mpegvideo.h:211
Bi-dir predicted.
Definition: avutil.h:268
int den
denominator
Definition: rational.h:45
#define av_free(p)
static uint8_t tmp[8]
Definition: des.c:38
#define FF_QP2LAMBDA
factor to convert from H.263 QP to lambda
Definition: avutil.h:219
float ff_xvid_rate_estimate_qscale(MpegEncContext *s, int dry_run)
Definition: libxvid_rc.c:101
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:2656