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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 <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 |