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 40static 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 47enum var_name { 48 VAR_AVTB, 49 VAR_INTB, 50 VAR_SR, 51 VAR_VARS_NB 52}; 53 54typedef 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) \ 62static 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 70static 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 107static 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 125DEFINE_OPTIONS(settb, VIDEO); 126AVFILTER_DEFINE_CLASS(settb); 127 128static 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 137static 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 146AVFilter 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 158DEFINE_OPTIONS(asettb, AUDIO); 159AVFILTER_DEFINE_CLASS(asettb); 160 161static 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 170static 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 179AVFilter 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