FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/noise_bsf.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 65 80 81.2%
Branches: 33 52 63.5%

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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 <stdlib.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 int ret;
82
83
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3 if (!s->amount_str) {
84 s->amount_str = (!s->drop_str && !s->dropamount) ? av_strdup("-1") : av_strdup("0");
85 if (!s->amount_str)
86 return AVERROR(ENOMEM);
87 }
88
89 3 ret = av_expr_parse(&s->amount_pexpr, s->amount_str,
90 var_names, NULL, NULL, NULL, NULL, 0, ctx);
91
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3 if (ret < 0) {
92 av_log(ctx, AV_LOG_ERROR, "Error in parsing expr for amount: %s\n", s->amount_str);
93 return ret;
94 }
95
96
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3 if (s->drop_str && s->dropamount) {
97 av_log(ctx, AV_LOG_WARNING, "Both drop '%s' and dropamount=%d set. Ignoring dropamount.\n",
98 s->drop_str, s->dropamount);
99 s->dropamount = 0;
100 }
101
102
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3 if (s->drop_str) {
103 1 ret = av_expr_parse(&s->drop_pexpr, s->drop_str,
104 var_names, NULL, NULL, NULL, NULL, 0, ctx);
105
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1 if (ret < 0) {
106 av_log(ctx, AV_LOG_ERROR, "Error in parsing expr for drop: %s\n", s->drop_str);
107 return ret;
108 }
109 }
110
111
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3 s->var_values[VAR_TB] = ctx->time_base_out.den ? av_q2d(ctx->time_base_out) : 0;
112 3 s->var_values[VAR_NOPTS] = AV_NOPTS_VALUE;
113 3 s->var_values[VAR_STARTPTS] = AV_NOPTS_VALUE;
114 3 s->var_values[VAR_STARTDTS] = AV_NOPTS_VALUE;
115 3 s->var_values[VAR_STATE] = 0;
116
117 3 return 0;
118 }
119
120 24 static int noise(AVBSFContext *ctx, AVPacket *pkt)
121 {
122 24 NoiseContext *s = ctx->priv_data;
123 24 int i, ret, amount, drop = 0;
124 double res;
125
126 24 ret = ff_bsf_get_packet_ref(ctx, pkt);
127
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24 if (ret < 0)
128 13 return ret;
129
130 11 s->var_values[VAR_N] = s->pkt_idx++;
131 11 s->var_values[VAR_PTS] = pkt->pts;
132 11 s->var_values[VAR_DTS] = pkt->dts;
133 11 s->var_values[VAR_DURATION] =
134 11 s->var_values[VAR_D] = pkt->duration;
135 11 s->var_values[VAR_SIZE] = pkt->size;
136
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11 s->var_values[VAR_KEY] = !!(pkt->flags & AV_PKT_FLAG_KEY);
137 11 s->var_values[VAR_POS] = pkt->pos;
138
139
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11 if (s->var_values[VAR_STARTPTS] == AV_NOPTS_VALUE)
140 3 s->var_values[VAR_STARTPTS] = pkt->pts;
141
142
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11 if (s->var_values[VAR_STARTDTS] == AV_NOPTS_VALUE)
143 3 s->var_values[VAR_STARTDTS] = pkt->dts;
144
145 11 res = av_expr_eval(s->amount_pexpr, s->var_values, NULL);
146
147
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11 if (isnan(res))
148 amount = 0;
149
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11 else if (res < 0)
150 5 amount = (s->state % 10001 + 1);
151 else
152 6 amount = (int)res;
153
154
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11 if (s->drop_str) {
155 5 res = av_expr_eval(s->drop_pexpr, s->var_values, NULL);
156
157
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5 if (isnan(res))
158 drop = 0;
159
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5 else if (res < 0)
160 5 drop = !(s->state % FFABS((int)res));
161 else
162 drop = !!res;
163 }
164
165
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11 if(s->dropamount) {
166 drop = !(s->state % s->dropamount);
167 }
168
169 11 av_log(ctx, AV_LOG_VERBOSE, "Stream #%d packet %d pts %"PRId64" - amount %d drop %d\n",
170 11 pkt->stream_index, (unsigned int)s->var_values[VAR_N], pkt->pts, amount, drop);
171
172
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11 if (drop) {
173 1 s->var_values[VAR_STATE] = ++s->state;
174 1 av_packet_unref(pkt);
175 1 return AVERROR(EAGAIN);
176 }
177
178
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10 if (amount) {
179 10 ret = av_packet_make_writable(pkt);
180
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10 if (ret < 0) {
181 av_packet_unref(pkt);
182 return ret;
183 }
184 }
185
186
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306428 for (i = 0; i < pkt->size; i++) {
187 306418 s->state += pkt->data[i] + 1;
188
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306418 if (amount && s->state % amount == 0)
189 7856 pkt->data[i] = s->state;
190 }
191
192 10 s->var_values[VAR_STATE] = s->state;
193
194 10 return 0;
195 }
196
197 3 static void noise_close(AVBSFContext *bsf)
198 {
199 3 NoiseContext *s = bsf->priv_data;
200
201 3 av_expr_free(s->amount_pexpr);
202 3 av_expr_free(s->drop_pexpr);
203 3 s->amount_pexpr = s->drop_pexpr = NULL;
204 3 }
205
206 #define OFFSET(x) offsetof(NoiseContext, x)
207 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_BSF_PARAM)
208 static const AVOption options[] = {
209 { "amount", NULL, OFFSET(amount_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
210 { "drop", NULL, OFFSET(drop_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
211 { "dropamount", NULL, OFFSET(dropamount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
212 { NULL },
213 };
214
215 static const AVClass noise_class = {
216 .class_name = "noise",
217 .item_name = av_default_item_name,
218 .option = options,
219 .version = LIBAVUTIL_VERSION_INT,
220 };
221
222 const FFBitStreamFilter ff_noise_bsf = {
223 .p.name = "noise",
224 .p.priv_class = &noise_class,
225 .priv_data_size = sizeof(NoiseContext),
226 .init = noise_init,
227 .close = noise_close,
228 .filter = noise,
229 };
230