| 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 */ |