blob: 83616c1361045f3c8704793386fbc88e9fac5b7c
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 */ |
188 |