FFmpeg  4.4.4
vf_qp.c
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1 /*
2  * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <math.h>
22 #include "libavutil/eval.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/pixdesc.h"
25 #include "libavutil/opt.h"
27 
28 #include "avfilter.h"
29 #include "formats.h"
30 #include "internal.h"
31 #include "video.h"
32 
33 typedef struct QPContext {
34  const AVClass *class;
35  char *qp_expr_str;
36  int8_t lut[257];
37  int h, qstride;
39 } QPContext;
40 
41 static const char *const var_names[] = { "known", "qp", "x", "y", "w", "h", NULL };
42 
43 #define OFFSET(x) offsetof(QPContext, x)
44 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
45 
46 static const AVOption qp_options[] = {
47  { "qp", "set qp expression", OFFSET(qp_expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
48  { NULL }
49 };
50 
52 
53 static int config_input(AVFilterLink *inlink)
54 {
55  AVFilterContext *ctx = inlink->dst;
56  QPContext *s = ctx->priv;
57  int i;
58  int ret;
59  AVExpr *e = NULL;
60 
61  if (!s->qp_expr_str)
62  return 0;
63 
64  ret = av_expr_parse(&e, s->qp_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
65  if (ret < 0)
66  return ret;
67 
68  s->h = (inlink->h + 15) >> 4;
69  s->qstride = (inlink->w + 15) >> 4;
70  for (i = -129; i < 128; i++) {
71  double var_values[] = { i != -129, i, NAN, NAN, s->qstride, s->h, 0};
72  double temp_val = av_expr_eval(e, var_values, NULL);
73 
74  if (isnan(temp_val)) {
75  if(strchr(s->qp_expr_str, 'x') || strchr(s->qp_expr_str, 'y'))
76  s->evaluate_per_mb = 1;
77  else {
78  av_expr_free(e);
79  return AVERROR(EINVAL);
80  }
81  }
82 
83  s->lut[i + 129] = lrintf(temp_val);
84  }
85  av_expr_free(e);
86 
87  return 0;
88 }
89 
90 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
91 {
92  AVFilterContext *ctx = inlink->dst;
93  AVFilterLink *outlink = ctx->outputs[0];
94  QPContext *s = ctx->priv;
95  AVFrame *out = NULL;
96  int ret;
97 
98  AVFrameSideData *sd_in;
99  AVVideoEncParams *par_in = NULL;
100  int8_t in_qp_global = 0;
101 
102  AVVideoEncParams *par_out;
103 
104  if (!s->qp_expr_str || ctx->is_disabled)
105  return ff_filter_frame(outlink, in);
106 
108  if (sd_in && sd_in->size >= sizeof(AVVideoEncParams)) {
109  par_in = (AVVideoEncParams*)sd_in->data;
110 
111  // we accept the input QP table only if it is of the MPEG2 type
112  // and contains either no blocks at all or 16x16 macroblocks
113  if (par_in->type == AV_VIDEO_ENC_PARAMS_MPEG2 &&
114  (par_in->nb_blocks == s->h * s->qstride || !par_in->nb_blocks)) {
115  in_qp_global = par_in->qp;
116  if (!par_in->nb_blocks)
117  par_in = NULL;
118  } else
119  par_in = NULL;
120  }
121 
122  out = av_frame_clone(in);
123  if (!out) {
124  ret = AVERROR(ENOMEM);
125  goto fail;
126  }
127 
129  (s->evaluate_per_mb || sd_in) ?
130  s->h * s->qstride : 0);
131  if (!par_out) {
132  ret = AVERROR(ENOMEM);
133  goto fail;
134  }
135 
136 #define BLOCK_QP_DELTA(block_idx) \
137  (par_in ? av_video_enc_params_block(par_in, block_idx)->delta_qp : 0)
138 
139  if (s->evaluate_per_mb) {
140  int y, x;
141 
142  for (y = 0; y < s->h; y++)
143  for (x = 0; x < s->qstride; x++) {
144  unsigned int block_idx = y * s->qstride + x;
145  AVVideoBlockParams *b = av_video_enc_params_block(par_out, block_idx);
146  int qp = sd_in ? in_qp_global + BLOCK_QP_DELTA(block_idx) : NAN;
147  double var_values[] = { !!sd_in, qp, x, y, s->qstride, s->h, 0};
148  double temp_val;
149 
150  ret = av_expr_parse_and_eval(&temp_val, s->qp_expr_str,
151  var_names, var_values,
152  NULL, NULL, NULL, NULL, 0, 0, ctx);
153  if (ret < 0)
154  goto fail;
155  b->delta_qp = lrintf(temp_val);
156  }
157  } else if (sd_in) {
158  int y, x;
159 
160  for (y = 0; y < s->h; y++)
161  for (x = 0; x < s->qstride; x++) {
162  unsigned int block_idx = y * s->qstride + x;
163  AVVideoBlockParams *b = av_video_enc_params_block(par_out, block_idx);
164  b->delta_qp = s->lut[129 + (int8_t)(in_qp_global + BLOCK_QP_DELTA(block_idx))];
165  }
166  } else {
167  par_out->qp = s->lut[0];
168  }
169 
170  ret = ff_filter_frame(outlink, out);
171  out = NULL;
172 fail:
173  av_frame_free(&in);
174  av_frame_free(&out);
175  return ret;
176 }
177 
178 static const AVFilterPad qp_inputs[] = {
179  {
180  .name = "default",
181  .type = AVMEDIA_TYPE_VIDEO,
182  .filter_frame = filter_frame,
183  .config_props = config_input,
184  },
185  { NULL }
186 };
187 
188 static const AVFilterPad qp_outputs[] = {
189  {
190  .name = "default",
191  .type = AVMEDIA_TYPE_VIDEO,
192  },
193  { NULL }
194 };
195 
197  .name = "qp",
198  .description = NULL_IF_CONFIG_SMALL("Change video quantization parameters."),
199  .priv_size = sizeof(QPContext),
200  .inputs = qp_inputs,
201  .outputs = qp_outputs,
202  .priv_class = &qp_class,
204 };
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1096
Main libavfilter public API header.
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define fail()
Definition: checkasm.h:133
#define NULL
Definition: coverity.c:32
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:766
int av_expr_parse_and_eval(double *d, const char *s, const char *const *const_names, const double *const_values, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), void *opaque, int log_offset, void *log_ctx)
Parse and evaluate an expression.
Definition: eval.c:776
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:685
simple arithmetic expression evaluator
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will have its filter_frame() c...
Definition: avfilter.h:134
#define AVERROR(e)
Definition: error.h:43
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:540
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrameSideData * av_frame_get_side_data(const AVFrame *frame, enum AVFrameSideDataType type)
Definition: frame.c:738
@ AV_FRAME_DATA_VIDEO_ENC_PARAMS
Encoding parameters for a video frame, as described by AVVideoEncParams.
Definition: frame.h:186
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
misc image utilities
int i
Definition: input.c:407
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define isnan(x)
Definition: libm.h:340
#define lrintf(x)
Definition: libm_mips.h:70
#define NAN
Definition: mathematics.h:64
AVOptions.
Describe the class of an AVClass context structure.
Definition: log.h:67
Definition: eval.c:157
An instance of a filter.
Definition: avfilter.h:341
A filter pad used for either input or output.
Definition: internal.h:54
const char * name
Pad name.
Definition: internal.h:60
Filter definition.
Definition: avfilter.h:145
const char * name
Filter name.
Definition: avfilter.h:149
Structure to hold side data for an AVFrame.
Definition: frame.h:220
uint8_t * data
Definition: frame.h:222
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
AVOption.
Definition: opt.h:248
Data structure for storing block-level encoding information.
Video encoding parameters for a given frame.
enum AVVideoEncParamsType type
Type of the parameters (the codec they are used with).
unsigned int nb_blocks
Number of blocks in the array.
int32_t qp
Base quantisation parameter for the frame.
int qstride
Definition: vf_qp.c:37
int8_t lut[257]
Definition: vf_qp.c:36
char * qp_expr_str
Definition: vf_qp.c:35
int h
Definition: vf_qp.c:37
int evaluate_per_mb
Definition: vf_qp.c:38
FILE * out
Definition: movenc.c:54
AVFormatContext * ctx
Definition: movenc.c:48
const char * b
Definition: vf_curves.c:118
if(ret< 0)
Definition: vf_mcdeint.c:282
AVFILTER_DEFINE_CLASS(qp)
static const AVFilterPad qp_inputs[]
Definition: vf_qp.c:178
static int config_input(AVFilterLink *inlink)
Definition: vf_qp.c:53
#define FLAGS
Definition: vf_qp.c:44
static const AVOption qp_options[]
Definition: vf_qp.c:46
AVFilter ff_vf_qp
Definition: vf_qp.c:196
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_qp.c:90
#define BLOCK_QP_DELTA(block_idx)
static const char *const var_names[]
Definition: vf_qp.c:41
static const AVFilterPad qp_outputs[]
Definition: vf_qp.c:188
#define OFFSET(x)
Definition: vf_qp.c:43
AVVideoEncParams * av_video_enc_params_create_side_data(AVFrame *frame, enum AVVideoEncParamsType type, unsigned int nb_blocks)
Allocates memory for AVEncodeInfoFrame plus an array of.
static av_always_inline AVVideoBlockParams * av_video_enc_params_block(AVVideoEncParams *par, unsigned int idx)
@ AV_VIDEO_ENC_PARAMS_MPEG2