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1 | /* |
2 | * Copyright (c) 2010 Stefano Sabatini | |
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 | * Set timebase for the output link. | |
24 | */ | |
25 | ||
26 | #include <inttypes.h> | |
27 | #include <stdio.h> | |
28 | ||
29 | #include "libavutil/avstring.h" | |
30 | #include "libavutil/eval.h" | |
31 | #include "libavutil/internal.h" | |
32 | #include "libavutil/mathematics.h" | |
33 | #include "libavutil/opt.h" | |
34 | #include "libavutil/rational.h" | |
35 | #include "audio.h" | |
36 | #include "avfilter.h" | |
37 | #include "internal.h" | |
38 | #include "video.h" | |
39 | ||
40 | static const char *const var_names[] = { | |
41 | "AVTB", /* default timebase 1/AV_TIME_BASE */ | |
42 | "intb", /* input timebase */ | |
43 | "sr", /* sample rate */ | |
44 | NULL | |
45 | }; | |
46 | ||
47 | enum var_name { | |
48 | VAR_AVTB, | |
49 | VAR_INTB, | |
50 | VAR_SR, | |
51 | VAR_VARS_NB | |
52 | }; | |
53 | ||
54 | typedef struct SetTBContext { | |
55 | const AVClass *class; | |
56 | char *tb_expr; | |
57 | double var_values[VAR_VARS_NB]; | |
58 | } SetTBContext; | |
59 | ||
60 | #define OFFSET(x) offsetof(SetTBContext, x) | |
61 | #define DEFINE_OPTIONS(filt_name, filt_type) \ | |
62 | static const AVOption filt_name##_options[] = { \ | |
63 | { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \ | |
64 | .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \ | |
65 | { "tb", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \ | |
66 | .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \ | |
67 | { NULL } \ | |
68 | } | |
69 | ||
70 | static int config_output_props(AVFilterLink *outlink) | |
71 | { | |
72 | AVFilterContext *ctx = outlink->src; | |
73 | SetTBContext *settb = ctx->priv; | |
74 | AVFilterLink *inlink = ctx->inputs[0]; | |
75 | AVRational time_base; | |
76 | int ret; | |
77 | double res; | |
78 | ||
79 | settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q); | |
80 | settb->var_values[VAR_INTB] = av_q2d(inlink->time_base); | |
81 | settb->var_values[VAR_SR] = inlink->sample_rate; | |
82 | ||
83 | outlink->w = inlink->w; | |
84 | outlink->h = inlink->h; | |
85 | ||
86 | if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values, | |
87 | NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) { | |
88 | av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr); | |
89 | return ret; | |
90 | } | |
91 | time_base = av_d2q(res, INT_MAX); | |
92 | if (time_base.num <= 0 || time_base.den <= 0) { | |
93 | av_log(ctx, AV_LOG_ERROR, | |
94 | "Invalid non-positive values for the timebase num:%d or den:%d.\n", | |
95 | time_base.num, time_base.den); | |
96 | return AVERROR(EINVAL); | |
97 | } | |
98 | ||
99 | outlink->time_base = time_base; | |
100 | av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n", | |
101 | inlink ->time_base.num, inlink ->time_base.den, | |
102 | outlink->time_base.num, outlink->time_base.den); | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
108 | { | |
109 | AVFilterContext *ctx = inlink->dst; | |
110 | AVFilterLink *outlink = ctx->outputs[0]; | |
111 | ||
112 | if (av_cmp_q(inlink->time_base, outlink->time_base)) { | |
113 | int64_t orig_pts = frame->pts; | |
114 | frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base); | |
115 | av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n", | |
116 | inlink ->time_base.num, inlink ->time_base.den, orig_pts, | |
117 | outlink->time_base.num, outlink->time_base.den, frame->pts); | |
118 | } | |
119 | ||
120 | return ff_filter_frame(outlink, frame); | |
121 | } | |
122 | ||
123 | #if CONFIG_SETTB_FILTER | |
124 | ||
125 | DEFINE_OPTIONS(settb, VIDEO); | |
126 | AVFILTER_DEFINE_CLASS(settb); | |
127 | ||
128 | static const AVFilterPad avfilter_vf_settb_inputs[] = { | |
129 | { | |
130 | .name = "default", | |
131 | .type = AVMEDIA_TYPE_VIDEO, | |
132 | .filter_frame = filter_frame, | |
133 | }, | |
134 | { NULL } | |
135 | }; | |
136 | ||
137 | static const AVFilterPad avfilter_vf_settb_outputs[] = { | |
138 | { | |
139 | .name = "default", | |
140 | .type = AVMEDIA_TYPE_VIDEO, | |
141 | .config_props = config_output_props, | |
142 | }, | |
143 | { NULL } | |
144 | }; | |
145 | ||
146 | AVFilter ff_vf_settb = { | |
147 | .name = "settb", | |
148 | .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."), | |
149 | .priv_size = sizeof(SetTBContext), | |
150 | .priv_class = &settb_class, | |
151 | .inputs = avfilter_vf_settb_inputs, | |
152 | .outputs = avfilter_vf_settb_outputs, | |
153 | }; | |
154 | #endif /* CONFIG_SETTB_FILTER */ | |
155 | ||
156 | #if CONFIG_ASETTB_FILTER | |
157 | ||
158 | DEFINE_OPTIONS(asettb, AUDIO); | |
159 | AVFILTER_DEFINE_CLASS(asettb); | |
160 | ||
161 | static const AVFilterPad avfilter_af_asettb_inputs[] = { | |
162 | { | |
163 | .name = "default", | |
164 | .type = AVMEDIA_TYPE_AUDIO, | |
165 | .filter_frame = filter_frame, | |
166 | }, | |
167 | { NULL } | |
168 | }; | |
169 | ||
170 | static const AVFilterPad avfilter_af_asettb_outputs[] = { | |
171 | { | |
172 | .name = "default", | |
173 | .type = AVMEDIA_TYPE_AUDIO, | |
174 | .config_props = config_output_props, | |
175 | }, | |
176 | { NULL } | |
177 | }; | |
178 | ||
179 | AVFilter ff_af_asettb = { | |
180 | .name = "asettb", | |
181 | .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."), | |
182 | .priv_size = sizeof(SetTBContext), | |
183 | .inputs = avfilter_af_asettb_inputs, | |
184 | .outputs = avfilter_af_asettb_outputs, | |
185 | .priv_class = &asettb_class, | |
186 | }; | |
187 | #endif /* CONFIG_ASETTB_FILTER */ |