Libav
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 
25 #if !HAVE_MKSTEMP
26 #include <fcntl.h>
27 #endif
28 #include <unistd.h>
29 #include <xvid.h>
30 
31 #include "libavutil/attributes.h"
32 #include "libavutil/internal.h"
33 
34 #include "avcodec.h"
35 #include "libxvid.h"
36 #include "mpegvideo.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 {
45  int fd = -1;
46 #if !HAVE_MKSTEMP
47  *filename = tempnam(".", prefix);
48 #else
49  size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
50  *filename = av_malloc(len);
51 #endif
52  /* -----common section-----*/
53  if (!(*filename)) {
54  av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
55  return AVERROR(ENOMEM);
56  }
57 #if !HAVE_MKSTEMP
58  fd = avpriv_open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
59 #else
60  snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
61  fd = mkstemp(*filename);
62  if (fd < 0) {
63  snprintf(*filename, len, "./%sXXXXXX", prefix);
64  fd = mkstemp(*filename);
65  }
66 #endif
67  /* -----common section-----*/
68  if (fd < 0) {
69  av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
70  return AVERROR(EIO);
71  }
72  return fd; /* success */
73 }
74 
76 {
77  char *tmp_name;
78  int fd, i;
79  xvid_plg_create_t xvid_plg_create = { 0 };
80  xvid_plugin_2pass2_t xvid_2pass2 = { 0 };
81 
82  fd = ff_tempfile("xvidrc.", &tmp_name);
83  if (fd < 0) {
84  av_log(NULL, AV_LOG_ERROR, "Can't create temporary pass2 file.\n");
85  return fd;
86  }
87 
88  for (i = 0; i < s->rc_context.num_entries; i++) {
89  static const char frame_types[] = " ipbs";
90  char tmp[256];
91  RateControlEntry *rce;
92 
93  rce = &s->rc_context.entry[i];
94 
95  snprintf(tmp, sizeof(tmp), "%c %d %d %d %d %d %d\n",
96  frame_types[rce->pict_type],
97  (int) lrintf(rce->qscale / FF_QP2LAMBDA),
98  rce->i_count, s->mb_num - rce->i_count - rce->skip_count,
99  rce->skip_count,
100  (rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits + 7) / 8,
101  (rce->header_bits + rce->mv_bits + 7) / 8);
102 
103  write(fd, tmp, strlen(tmp));
104  }
105 
106  close(fd);
107 
108  xvid_2pass2.version = XVID_MAKE_VERSION(1, 1, 0);
109  xvid_2pass2.filename = tmp_name;
110  xvid_2pass2.bitrate = s->avctx->bit_rate;
111  xvid_2pass2.vbv_size = s->avctx->rc_buffer_size;
112  xvid_2pass2.vbv_maxrate = s->avctx->rc_max_rate;
113  xvid_2pass2.vbv_initial = s->avctx->rc_initial_buffer_occupancy;
114 
115  xvid_plg_create.version = XVID_MAKE_VERSION(1, 1, 0);
116  xvid_plg_create.fbase = s->avctx->time_base.den;
117  xvid_plg_create.fincr = s->avctx->time_base.num;
118  xvid_plg_create.param = &xvid_2pass2;
119 
120  if (xvid_plugin_2pass2(NULL, XVID_PLG_CREATE, &xvid_plg_create,
121  &s->rc_context.non_lavc_opaque) < 0) {
122  av_log(NULL, AV_LOG_ERROR, "xvid_plugin_2pass2 failed\n");
123  return -1;
124  }
125  return 0;
126 }
127 
129 {
130  xvid_plg_data_t xvid_plg_data = { 0 };
131 
132  xvid_plg_data.version = XVID_MAKE_VERSION(1, 1, 0);
133  xvid_plg_data.width = s->width;
134  xvid_plg_data.height = s->height;
135  xvid_plg_data.mb_width = s->mb_width;
136  xvid_plg_data.mb_height = s->mb_height;
137  xvid_plg_data.fbase = s->avctx->time_base.den;
138  xvid_plg_data.fincr = s->avctx->time_base.num;
139  xvid_plg_data.min_quant[0] = s->avctx->qmin;
140  xvid_plg_data.min_quant[1] = s->avctx->qmin;
141  xvid_plg_data.min_quant[2] = s->avctx->qmin; // FIXME i/b factor & offset
142  xvid_plg_data.max_quant[0] = s->avctx->qmax;
143  xvid_plg_data.max_quant[1] = s->avctx->qmax;
144  xvid_plg_data.max_quant[2] = s->avctx->qmax; // FIXME i/b factor & offset
145  xvid_plg_data.bquant_offset = 0; // 100 * s->avctx->b_quant_offset;
146  xvid_plg_data.bquant_ratio = 100; // * s->avctx->b_quant_factor;
147 
148  if (!s->rc_context.dry_run_qscale) {
149  if (s->picture_number) {
150  xvid_plg_data.length =
151  xvid_plg_data.stats.length = (s->frame_bits + 7) / 8;
152  xvid_plg_data.frame_num = s->rc_context.last_picture_number;
153  xvid_plg_data.quant = s->qscale;
154  xvid_plg_data.type = s->last_pict_type;
155  if (xvid_plugin_2pass2(s->rc_context.non_lavc_opaque,
156  XVID_PLG_AFTER, &xvid_plg_data, NULL)) {
158  "xvid_plugin_2pass2(handle, XVID_PLG_AFTER, ...) FAILED\n");
159  return -1;
160  }
161  }
163  xvid_plg_data.frame_num = s->picture_number;
164  xvid_plg_data.quant = 0;
165  if (xvid_plugin_2pass2(s->rc_context.non_lavc_opaque,
166  XVID_PLG_BEFORE, &xvid_plg_data, NULL)) {
168  "xvid_plugin_2pass2(handle, XVID_PLG_BEFORE, ...) FAILED\n");
169  return -1;
170  }
171  s->rc_context.dry_run_qscale = xvid_plg_data.quant;
172  }
173  xvid_plg_data.quant = s->rc_context.dry_run_qscale;
174  if (!dry_run)
175  s->rc_context.dry_run_qscale = 0;
176 
177  // FIXME this is not exactly identical to Xvid
178  if (s->pict_type == AV_PICTURE_TYPE_B)
179  return xvid_plg_data.quant * FF_QP2LAMBDA * s->avctx->b_quant_factor +
180  s->avctx->b_quant_offset;
181  else
182  return xvid_plg_data.quant * FF_QP2LAMBDA;
183 }
184 
186 {
187  xvid_plg_destroy_t xvid_plg_destroy;
188 
189  xvid_plugin_2pass2(s->rc_context.non_lavc_opaque, XVID_PLG_DESTROY,
190  &xvid_plg_destroy, NULL);
191 }
int frame_bits
bits used for the current frame
Definition: mpegvideo.h:327
RateControlContext rc_context
contains stuff only accessed in ratecontrol.c
Definition: mpegvideo.h:329
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
int picture_number
Definition: mpegvideo.h:122
RateControlEntry * entry
Definition: ratecontrol.h:65
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:2426
int num
numerator
Definition: rational.h:44
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
mpegvideo header.
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:128
int qscale
QP.
Definition: mpegvideo.h:199
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:1535
#define av_cold
Definition: attributes.h:66
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:1688
int avpriv_open(const char *filename, int flags,...)
A wrapper for open() setting O_CLOEXEC.
Definition: file_open.c:66
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:124
int num_entries
number of RateControlEntries
Definition: ratecontrol.h:64
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
#define AVERROR(e)
Definition: error.h:43
int qmax
maximum quantizer
Definition: avcodec.h:2337
int rc_max_rate
maximum bitrate
Definition: avcodec.h:2387
av_cold void ff_xvid_rate_control_uninit(MpegEncContext *s)
Definition: libxvid_rc.c:185
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2364
float dry_run_qscale
for xvid rc
Definition: ratecontrol.h:84
common internal API header
int bit_rate
the average bitrate
Definition: avcodec.h:1473
static av_always_inline av_const long int lrintf(float x)
Definition: libm.h:144
NULL
Definition: eval.c:55
Libavcodec external API header.
int qmin
minimum quantizer
Definition: avcodec.h:2330
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:95
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:1707
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:206
MpegEncContext.
Definition: mpegvideo.h:76
struct AVCodecContext * avctx
Definition: mpegvideo.h:93
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:75
int last_pict_type
Definition: mpegvideo.h:207
Bi-dir predicted.
Definition: avutil.h:262
int den
denominator
Definition: rational.h:45
int ff_tempfile(const char *prefix, char **filename)
Definition: libxvid_rc.c:43
int len
static uint8_t tmp[8]
Definition: des.c:38
#define FF_QP2LAMBDA
factor to convert from H.263 QP to lambda
Definition: avutil.h:214
float ff_xvid_rate_estimate_qscale(MpegEncContext *s, int dry_run)
Definition: libxvid_rc.c:128