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