| 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 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 3 times. | 3 | if (!amount_str) | 
| 85 | ✗ | amount_str = (!s->drop_str && !s->dropamount) ? "-1" : "0"; | |
| 86 | |||
| 87 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 3 times. | 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 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 3 times. | 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 | 3/4✓ Branch 0 taken 1 times. ✓ Branch 1 taken 2 times. ✗ Branch 2 not taken. ✓ Branch 3 taken 1 times. | 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 | 2/2✓ Branch 0 taken 1 times. ✓ Branch 1 taken 2 times. | 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 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 1 times. | 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 | 1/2✓ Branch 0 taken 3 times. ✗ Branch 1 not taken. | 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 | 2/2✓ Branch 0 taken 13 times. ✓ Branch 1 taken 11 times. | 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 | 1/2✓ Branch 0 taken 11 times. ✗ Branch 1 not taken. | 11 | s->var_values[VAR_KEY] = !!(pkt->flags & AV_PKT_FLAG_KEY); | 
| 141 | 11 | s->var_values[VAR_POS] = pkt->pos; | |
| 142 | |||
| 143 | 2/2✓ Branch 0 taken 3 times. ✓ Branch 1 taken 8 times. | 11 | if (s->var_values[VAR_STARTPTS] == AV_NOPTS_VALUE) | 
| 144 | 3 | s->var_values[VAR_STARTPTS] = pkt->pts; | |
| 145 | |||
| 146 | 2/2✓ Branch 0 taken 3 times. ✓ Branch 1 taken 8 times. | 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 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 11 times. | 11 | if (isnan(res)) | 
| 152 | ✗ | amount = 0; | |
| 153 | 2/2✓ Branch 0 taken 5 times. ✓ Branch 1 taken 6 times. | 11 | else if (res < 0) | 
| 154 | 5 | amount = (s->state % 10001 + 1); | |
| 155 | else | ||
| 156 | 6 | amount = (int)res; | |
| 157 | |||
| 158 | 2/2✓ Branch 0 taken 5 times. ✓ Branch 1 taken 6 times. | 11 | if (s->drop_str) { | 
| 159 | 5 | res = av_expr_eval(s->drop_pexpr, s->var_values, NULL); | |
| 160 | |||
| 161 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 5 times. | 5 | if (isnan(res)) | 
| 162 | ✗ | drop = 0; | |
| 163 | 1/2✓ Branch 0 taken 5 times. ✗ Branch 1 not taken. | 5 | else if (res < 0) | 
| 164 | 5 | drop = !(s->state % FFABS((int)res)); | |
| 165 | else | ||
| 166 | ✗ | drop = !!res; | |
| 167 | } | ||
| 168 | |||
| 169 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 11 times. | 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 | 2/2✓ Branch 0 taken 1 times. ✓ Branch 1 taken 10 times. | 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 | 1/2✓ Branch 0 taken 10 times. ✗ Branch 1 not taken. | 10 | if (amount) { | 
| 183 | 10 | ret = av_packet_make_writable(pkt); | |
| 184 | 1/2✗ Branch 0 not taken. ✓ Branch 1 taken 10 times. | 10 | if (ret < 0) { | 
| 185 | ✗ | av_packet_unref(pkt); | |
| 186 | ✗ | return ret; | |
| 187 | } | ||
| 188 | } | ||
| 189 | |||
| 190 | 2/2✓ Branch 0 taken 306418 times. ✓ Branch 1 taken 10 times. | 306428 | for (i = 0; i < pkt->size; i++) { | 
| 191 | 306418 | s->state += pkt->data[i] + 1; | |
| 192 | 3/4✓ Branch 0 taken 306418 times. ✗ Branch 1 not taken. ✓ Branch 2 taken 7856 times. ✓ Branch 3 taken 298562 times. | 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 |