FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bsf/noise.c
Date: 2025-10-10 03:51:19
Exec Total Coverage
Lines: 67 83 80.7%
Functions: 3 3 100.0%
Branches: 34 54 63.0%
Line Branch Exec Source
1 /*
2 * copyright (c) 2006 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 <stddef.h>
22
23 #include "bsf.h"
24 #include "bsf_internal.h"
25
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/eval.h"
29
30 static const char *const var_names[] = {
31 "n", ///< packet index, starting from zero
32 "tb", ///< timebase
33 "pts", ///< packet presentation timestamp
34 "dts", ///< packet decoding timestamp
35 "nopts", ///< AV_NOPTS_VALUE
36 "startpts", ///< first seen non-AV_NOPTS_VALUE packet timestamp
37 "startdts", ///< first seen non-AV_NOPTS_VALUE packet timestamp
38 "duration", "d", ///< packet duration
39 "pos", ///< original position of packet in its source
40 "size", ///< packet size
41 "key" , ///< packet keyframe flag
42 "state", ///< random-ish state
43 NULL
44 };
45
46 enum var_name {
47 VAR_N,
48 VAR_TB,
49 VAR_PTS,
50 VAR_DTS,
51 VAR_NOPTS,
52 VAR_STARTPTS,
53 VAR_STARTDTS,
54 VAR_DURATION, VAR_D,
55 VAR_POS,
56 VAR_SIZE,
57 VAR_KEY,
58 VAR_STATE,
59 VAR_VARS_NB
60 };
61
62 typedef struct NoiseContext {
63 const AVClass *class;
64
65 char *amount_str;
66 char *drop_str;
67 int dropamount;
68
69 AVExpr *amount_pexpr;
70 AVExpr *drop_pexpr;
71
72 double var_values[VAR_VARS_NB];
73
74 unsigned int state;
75 unsigned int pkt_idx;
76 } NoiseContext;
77
78 3 static int noise_init(AVBSFContext *ctx)
79 {
80 3 NoiseContext *s = ctx->priv_data;
81 3 const char *amount_str = s->amount_str;
82 int ret;
83
84
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 3 if (!amount_str)
85 ✗ amount_str = (!s->drop_str && !s->dropamount) ? "-1" : "0";
86
87
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 3 if (ctx->par_in->codec_id == AV_CODEC_ID_WRAPPED_AVFRAME &&
88 ✗ strcmp(amount_str, "0")) {
89 ✗ av_log(ctx, AV_LOG_ERROR, "Wrapped AVFrame noising is unsupported\n");
90 ✗ return AVERROR_PATCHWELCOME;
91 }
92
93 3 ret = av_expr_parse(&s->amount_pexpr, amount_str,
94 var_names, NULL, NULL, NULL, NULL, 0, ctx);
95
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 3 if (ret < 0) {
96 ✗ av_log(ctx, AV_LOG_ERROR, "Error in parsing expr for amount: %s\n", amount_str);
97 ✗ return ret;
98 }
99
100
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 3 if (s->drop_str && s->dropamount) {
101 ✗ av_log(ctx, AV_LOG_WARNING, "Both drop '%s' and dropamount=%d set. Ignoring dropamount.\n",
102 s->drop_str, s->dropamount);
103 ✗ s->dropamount = 0;
104 }
105
106
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 3 if (s->drop_str) {
107 1 ret = av_expr_parse(&s->drop_pexpr, s->drop_str,
108 var_names, NULL, NULL, NULL, NULL, 0, ctx);
109
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 1 if (ret < 0) {
110 ✗ av_log(ctx, AV_LOG_ERROR, "Error in parsing expr for drop: %s\n", s->drop_str);
111 ✗ return ret;
112 }
113 }
114
115
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 3 s->var_values[VAR_TB] = ctx->time_base_out.den ? av_q2d(ctx->time_base_out) : 0;
116 3 s->var_values[VAR_NOPTS] = AV_NOPTS_VALUE;
117 3 s->var_values[VAR_STARTPTS] = AV_NOPTS_VALUE;
118 3 s->var_values[VAR_STARTDTS] = AV_NOPTS_VALUE;
119 3 s->var_values[VAR_STATE] = 0;
120
121 3 return 0;
122 }
123
124 24 static int noise(AVBSFContext *ctx, AVPacket *pkt)
125 {
126 24 NoiseContext *s = ctx->priv_data;
127 24 int i, ret, amount, drop = 0;
128 double res;
129
130 24 ret = ff_bsf_get_packet_ref(ctx, pkt);
131
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 24 if (ret < 0)
132 13 return ret;
133
134 11 s->var_values[VAR_N] = s->pkt_idx++;
135 11 s->var_values[VAR_PTS] = pkt->pts;
136 11 s->var_values[VAR_DTS] = pkt->dts;
137 11 s->var_values[VAR_DURATION] =
138 11 s->var_values[VAR_D] = pkt->duration;
139 11 s->var_values[VAR_SIZE] = pkt->size;
140
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 11 s->var_values[VAR_KEY] = !!(pkt->flags & AV_PKT_FLAG_KEY);
141 11 s->var_values[VAR_POS] = pkt->pos;
142
143
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 11 if (s->var_values[VAR_STARTPTS] == AV_NOPTS_VALUE)
144 3 s->var_values[VAR_STARTPTS] = pkt->pts;
145
146
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 11 if (s->var_values[VAR_STARTDTS] == AV_NOPTS_VALUE)
147 3 s->var_values[VAR_STARTDTS] = pkt->dts;
148
149 11 res = av_expr_eval(s->amount_pexpr, s->var_values, NULL);
150
151
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 11 if (isnan(res))
152 ✗ amount = 0;
153
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 11 else if (res < 0)
154 5 amount = (s->state % 10001 + 1);
155 else
156 6 amount = (int)res;
157
158
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 11 if (s->drop_str) {
159 5 res = av_expr_eval(s->drop_pexpr, s->var_values, NULL);
160
161
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 5 if (isnan(res))
162 ✗ drop = 0;
163
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 5 else if (res < 0)
164 5 drop = !(s->state % FFABS((int)res));
165 else
166 ✗ drop = !!res;
167 }
168
169
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 11 if(s->dropamount) {
170 ✗ drop = !(s->state % s->dropamount);
171 }
172
173 11 av_log(ctx, AV_LOG_VERBOSE, "Stream #%d packet %d pts %"PRId64" - amount %d drop %d\n",
174 11 pkt->stream_index, (unsigned int)s->var_values[VAR_N], pkt->pts, amount, drop);
175
176
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 11 if (drop) {
177 1 s->var_values[VAR_STATE] = ++s->state;
178 1 av_packet_unref(pkt);
179 1 return AVERROR(EAGAIN);
180 }
181
182
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 10 if (amount) {
183 10 ret = av_packet_make_writable(pkt);
184
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 10 if (ret < 0) {
185 ✗ av_packet_unref(pkt);
186 ✗ return ret;
187 }
188 }
189
190
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 306428 for (i = 0; i < pkt->size; i++) {
191 306418 s->state += pkt->data[i] + 1;
192
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 306418 if (amount && s->state % amount == 0)
193 7856 pkt->data[i] = s->state;
194 }
195
196 10 s->var_values[VAR_STATE] = s->state;
197
198 10 return 0;
199 }
200
201 3 static void noise_close(AVBSFContext *bsf)
202 {
203 3 NoiseContext *s = bsf->priv_data;
204
205 3 av_expr_free(s->amount_pexpr);
206 3 av_expr_free(s->drop_pexpr);
207 3 s->amount_pexpr = s->drop_pexpr = NULL;
208 3 }
209
210 #define OFFSET(x) offsetof(NoiseContext, x)
211 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_BSF_PARAM)
212 static const AVOption options[] = {
213 { "amount", NULL, OFFSET(amount_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
214 { "drop", NULL, OFFSET(drop_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
215 { "dropamount", NULL, OFFSET(dropamount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
216 { NULL },
217 };
218
219 static const AVClass noise_class = {
220 .class_name = "noise",
221 .item_name = av_default_item_name,
222 .option = options,
223 .version = LIBAVUTIL_VERSION_INT,
224 };
225
226 const FFBitStreamFilter ff_noise_bsf = {
227 .p.name = "noise",
228 .p.priv_class = &noise_class,
229 .priv_data_size = sizeof(NoiseContext),
230 .init = noise_init,
231 .close = noise_close,
232 .filter = noise,
233 };
234