FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bsf/setts.c
Date: 2025-12-07 22:02:57
Exec Total Coverage
Lines: 81 96 84.4%
Functions: 3 3 100.0%
Branches: 29 46 63.0%
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1 /*
2 * Copyright (c) 2021 Paul B Mahol
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 /**
22 * @file
23 * Change the PTS/DTS timestamps.
24 */
25
26 #include "libavutil/opt.h"
27 #include "libavutil/eval.h"
28
29 #include "bsf.h"
30 #include "bsf_internal.h"
31
32 static const char *const var_names[] = {
33 "N", ///< frame number (starting at zero)
34 "TS",
35 "POS", ///< original position in the file of the frame
36 "PREV_INPTS", ///< previous input PTS
37 "PREV_INDTS", ///< previous input DTS
38 "PREV_INDURATION", ///< previous input duration
39 "PREV_OUTPTS", ///< previous output PTS
40 "PREV_OUTDTS", ///< previous output DTS
41 "PREV_OUTDURATION", ///< previous output duration
42 "NEXT_PTS", ///< next input PTS
43 "NEXT_DTS", ///< next input DTS
44 "NEXT_DURATION", ///< next input duration
45 "PTS", ///< original PTS in the file of the frame
46 "DTS", ///< original DTS in the file of the frame
47 "DURATION", ///< original duration in the file of the frame
48 "STARTPTS", ///< PTS at start of movie
49 "STARTDTS", ///< DTS at start of movie
50 "TB", ///< input timebase of the stream
51 "TB_OUT", ///< output timebase of the stream
52 "SR", ///< sample rate of the stream
53 "NOPTS", ///< The AV_NOPTS_VALUE constant
54 NULL
55 };
56
57 enum var_name {
58 VAR_N,
59 VAR_TS,
60 VAR_POS,
61 VAR_PREV_INPTS,
62 VAR_PREV_INDTS,
63 VAR_PREV_INDUR,
64 VAR_PREV_OUTPTS,
65 VAR_PREV_OUTDTS,
66 VAR_PREV_OUTDUR,
67 VAR_NEXT_PTS,
68 VAR_NEXT_DTS,
69 VAR_NEXT_DUR,
70 VAR_PTS,
71 VAR_DTS,
72 VAR_DURATION,
73 VAR_STARTPTS,
74 VAR_STARTDTS,
75 VAR_TB,
76 VAR_TB_OUT,
77 VAR_SR,
78 VAR_NOPTS,
79 VAR_VARS_NB
80 };
81
82 typedef struct SetTSContext {
83 const AVClass *class;
84
85 char *ts_str;
86 char *pts_str;
87 char *dts_str;
88 char *duration_str;
89
90 AVRational time_base;
91
92 int64_t frame_number;
93
94 double var_values[VAR_VARS_NB];
95
96 AVExpr *ts_expr;
97 AVExpr *pts_expr;
98 AVExpr *dts_expr;
99 AVExpr *duration_expr;
100
101 AVPacket *prev_inpkt;
102 AVPacket *prev_outpkt;
103 AVPacket *cur_pkt;
104 } SetTSContext;
105
106 5 static int setts_init(AVBSFContext *ctx)
107 {
108 5 SetTSContext *s = ctx->priv_data;
109 int ret;
110
111 5 s->prev_inpkt = av_packet_alloc();
112 5 s->prev_outpkt = av_packet_alloc();
113 5 s->cur_pkt = av_packet_alloc();
114
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 5 if (!s->prev_inpkt || !s->prev_outpkt || !s->cur_pkt)
115 ✗ return AVERROR(ENOMEM);
116
117
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 5 if ((ret = av_expr_parse(&s->ts_expr, s->ts_str,
118 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
119 ✗ av_log(ctx, AV_LOG_ERROR, "Error while parsing ts expression '%s'\n", s->ts_str);
120 ✗ return ret;
121 }
122
123
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 5 if ((ret = av_expr_parse(&s->duration_expr, s->duration_str,
124 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
125 ✗ av_log(ctx, AV_LOG_ERROR, "Error while parsing duration expression '%s'\n", s->duration_str);
126 ✗ return ret;
127 }
128
129
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 5 if (s->pts_str) {
130
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 3 if ((ret = av_expr_parse(&s->pts_expr, s->pts_str,
131 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
132 ✗ av_log(ctx, AV_LOG_ERROR, "Error while parsing pts expression '%s'\n", s->pts_str);
133 ✗ return ret;
134 }
135 }
136
137
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 5 if (s->dts_str) {
138 ✗ if ((ret = av_expr_parse(&s->dts_expr, s->dts_str,
139 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
140 ✗ av_log(ctx, AV_LOG_ERROR, "Error while parsing dts expression '%s'\n", s->dts_str);
141 ✗ return ret;
142 }
143 }
144
145
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 5 if (s->time_base.num > 0 && s->time_base.den > 0)
146 ✗ ctx->time_base_out = s->time_base;
147
148 5 s->frame_number= 0;
149 5 s->var_values[VAR_STARTPTS] = AV_NOPTS_VALUE;
150 5 s->var_values[VAR_STARTDTS] = AV_NOPTS_VALUE;
151 5 s->var_values[VAR_NOPTS] = AV_NOPTS_VALUE;
152
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 5 s->var_values[VAR_TB] = ctx->time_base_in.den ? av_q2d(ctx->time_base_in) : 0;
153
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 5 s->var_values[VAR_TB_OUT]= ctx->time_base_out.den ? av_q2d(ctx->time_base_out) : 0;
154 5 s->var_values[VAR_SR] = ctx->par_in->sample_rate;
155
156 5 return 0;
157 }
158
159 177 static int setts_filter(AVBSFContext *ctx, AVPacket *pkt)
160 {
161 177 SetTSContext *s = ctx->priv_data;
162 int64_t new_ts, new_pts, new_dts, new_duration;
163 int ret;
164
165 177 ret = ff_bsf_get_packet_ref(ctx, pkt);
166
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 177 if (ret < 0 && (ret != AVERROR_EOF || !s->cur_pkt->data))
167 85 return ret;
168
169
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 92 if (!s->cur_pkt->data) {
170 7 av_packet_move_ref(s->cur_pkt, pkt);
171 7 return AVERROR(EAGAIN);
172 }
173
174
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 85 if (s->var_values[VAR_STARTPTS] == AV_NOPTS_VALUE)
175 14 s->var_values[VAR_STARTPTS] = s->cur_pkt->pts;
176
177
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 85 if (s->var_values[VAR_STARTDTS] == AV_NOPTS_VALUE)
178 5 s->var_values[VAR_STARTDTS] = s->cur_pkt->dts;
179
180 85 s->var_values[VAR_N] = s->frame_number++;
181 85 s->var_values[VAR_TS] = s->cur_pkt->dts;
182 85 s->var_values[VAR_POS] = s->cur_pkt->pos;
183 85 s->var_values[VAR_PTS] = s->cur_pkt->pts;
184 85 s->var_values[VAR_DTS] = s->cur_pkt->dts;
185 85 s->var_values[VAR_DURATION] = s->cur_pkt->duration;
186 85 s->var_values[VAR_PREV_INPTS] = s->prev_inpkt->pts;
187 85 s->var_values[VAR_PREV_INDTS] = s->prev_inpkt->dts;
188 85 s->var_values[VAR_PREV_INDUR] = s->prev_inpkt->duration;
189 85 s->var_values[VAR_PREV_OUTPTS] = s->prev_outpkt->pts;
190 85 s->var_values[VAR_PREV_OUTDTS] = s->prev_outpkt->dts;
191 85 s->var_values[VAR_PREV_OUTDUR] = s->prev_outpkt->duration;
192 85 s->var_values[VAR_NEXT_PTS] = pkt->pts;
193 85 s->var_values[VAR_NEXT_DTS] = pkt->dts;
194 85 s->var_values[VAR_NEXT_DUR] = pkt->duration;
195
196 85 new_ts = llrint(av_expr_eval(s->ts_expr, s->var_values, NULL));
197 85 new_duration = llrint(av_expr_eval(s->duration_expr, s->var_values, NULL));
198
199
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 85 if (s->pts_str) {
200 33 s->var_values[VAR_TS] = s->cur_pkt->pts;
201 33 new_pts = llrint(av_expr_eval(s->pts_expr, s->var_values, NULL));
202 } else {
203 52 new_pts = new_ts;
204 }
205
206
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 85 if (s->dts_str) {
207 ✗ s->var_values[VAR_TS] = s->cur_pkt->dts;
208 ✗ new_dts = llrint(av_expr_eval(s->dts_expr, s->var_values, NULL));
209 } else {
210 85 new_dts = new_ts;
211 }
212
213 85 av_packet_unref(s->prev_inpkt);
214 85 av_packet_unref(s->prev_outpkt);
215 85 av_packet_move_ref(s->prev_inpkt, s->cur_pkt);
216 85 av_packet_move_ref(s->cur_pkt, pkt);
217
218 85 ret = av_packet_ref(pkt, s->prev_inpkt);
219
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 85 if (ret < 0)
220 ✗ return ret;
221
222 85 pkt->pts = new_pts;
223 85 pkt->dts = new_dts;
224 85 pkt->duration = new_duration;
225
226 85 ret = av_packet_ref(s->prev_outpkt, pkt);
227
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 85 if (ret < 0)
228 ✗ av_packet_unref(pkt);
229
230 85 return ret;
231 }
232
233 5 static void setts_close(AVBSFContext *bsf)
234 {
235 5 SetTSContext *s = bsf->priv_data;
236
237 5 av_packet_free(&s->prev_inpkt);
238 5 av_packet_free(&s->prev_outpkt);
239 5 av_packet_free(&s->cur_pkt);
240
241 5 av_expr_free(s->ts_expr);
242 5 s->ts_expr = NULL;
243 5 av_expr_free(s->pts_expr);
244 5 s->pts_expr = NULL;
245 5 av_expr_free(s->dts_expr);
246 5 s->dts_expr = NULL;
247 5 av_expr_free(s->duration_expr);
248 5 s->duration_expr = NULL;
249 5 }
250
251 #define OFFSET(x) offsetof(SetTSContext, x)
252 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_BSF_PARAM)
253
254 static const AVOption options[] = {
255 { "ts", "set expression for packet PTS and DTS", OFFSET(ts_str), AV_OPT_TYPE_STRING, {.str="TS"}, 0, 0, FLAGS },
256 { "pts", "set expression for packet PTS", OFFSET(pts_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
257 { "dts", "set expression for packet DTS", OFFSET(dts_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
258 { "duration", "set expression for packet duration", OFFSET(duration_str), AV_OPT_TYPE_STRING, {.str="DURATION"}, 0, 0, FLAGS },
259 { "time_base", "set output timebase", OFFSET(time_base), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS },
260 { NULL },
261 };
262
263 static const AVClass setts_class = {
264 .class_name = "setts_bsf",
265 .item_name = av_default_item_name,
266 .option = options,
267 .version = LIBAVUTIL_VERSION_INT,
268 };
269
270 const FFBitStreamFilter ff_setts_bsf = {
271 .p.name = "setts",
272 .p.priv_class = &setts_class,
273 .priv_data_size = sizeof(SetTSContext),
274 .init = setts_init,
275 .close = setts_close,
276 .filter = setts_filter,
277 };
278