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  1. /*
  2.  * Copyright (c) 2010 Stefano Sabatini
  3.  * Copyright (c) 2008 Victor Paesa
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * video presentation timestamp (PTS) modification filter
  25.  */
  26.  
  27. #include "libavutil/eval.h"
  28. #include "libavutil/internal.h"
  29. #include "libavutil/mathematics.h"
  30. #include "libavutil/opt.h"
  31. #include "libavutil/time.h"
  32. #include "audio.h"
  33. #include "avfilter.h"
  34. #include "internal.h"
  35. #include "video.h"
  36.  
  37. static const char *const var_names[] = {
  38.     "FRAME_RATE",  ///< defined only for constant frame-rate video
  39.     "INTERLACED",  ///< tell if the current frame is interlaced
  40.     "N",           ///< frame / sample number (starting at zero)
  41.     "NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
  42.     "NB_SAMPLES",  ///< number of samples in the current frame (only audio)
  43.     "POS",         ///< original position in the file of the frame
  44.     "PREV_INPTS",  ///< previous  input PTS
  45.     "PREV_INT",    ///< previous  input time in seconds
  46.     "PREV_OUTPTS", ///< previous output PTS
  47.     "PREV_OUTT",   ///< previous output time in seconds
  48.     "PTS",         ///< original pts in the file of the frame
  49.     "SAMPLE_RATE", ///< sample rate (only audio)
  50.     "STARTPTS",    ///< PTS at start of movie
  51.     "STARTT",      ///< time at start of movie
  52.     "T",           ///< original time in the file of the frame
  53.     "TB",          ///< timebase
  54.     "RTCTIME",     ///< wallclock (RTC) time in micro seconds
  55.     "RTCSTART",    ///< wallclock (RTC) time at the start of the movie in micro seconds
  56.     "S",           //   Number of samples in the current frame
  57.     "SR",          //   Audio sample rate
  58.     NULL
  59. };
  60.  
  61. enum var_name {
  62.     VAR_FRAME_RATE,
  63.     VAR_INTERLACED,
  64.     VAR_N,
  65.     VAR_NB_CONSUMED_SAMPLES,
  66.     VAR_NB_SAMPLES,
  67.     VAR_POS,
  68.     VAR_PREV_INPTS,
  69.     VAR_PREV_INT,
  70.     VAR_PREV_OUTPTS,
  71.     VAR_PREV_OUTT,
  72.     VAR_PTS,
  73.     VAR_SAMPLE_RATE,
  74.     VAR_STARTPTS,
  75.     VAR_STARTT,
  76.     VAR_T,
  77.     VAR_TB,
  78.     VAR_RTCTIME,
  79.     VAR_RTCSTART,
  80.     VAR_S,
  81.     VAR_SR,
  82.     VAR_VARS_NB
  83. };
  84.  
  85. typedef struct {
  86.     const AVClass *class;
  87.     char *expr_str;
  88.     AVExpr *expr;
  89.     double var_values[VAR_VARS_NB];
  90.     enum AVMediaType type;
  91. } SetPTSContext;
  92.  
  93. static av_cold int init(AVFilterContext *ctx)
  94. {
  95.     SetPTSContext *setpts = ctx->priv;
  96.     int ret;
  97.  
  98.     if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
  99.                              var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
  100.         av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
  101.         return ret;
  102.     }
  103.  
  104.     setpts->var_values[VAR_N]           = 0.0;
  105.     setpts->var_values[VAR_S]           = 0.0;
  106.     setpts->var_values[VAR_PREV_INPTS]  = NAN;
  107.     setpts->var_values[VAR_PREV_INT]    = NAN;
  108.     setpts->var_values[VAR_PREV_OUTPTS] = NAN;
  109.     setpts->var_values[VAR_PREV_OUTT]   = NAN;
  110.     setpts->var_values[VAR_STARTPTS]    = NAN;
  111.     setpts->var_values[VAR_STARTT]      = NAN;
  112.     return 0;
  113. }
  114.  
  115. static int config_input(AVFilterLink *inlink)
  116. {
  117.     AVFilterContext *ctx = inlink->dst;
  118.     SetPTSContext *setpts = ctx->priv;
  119.  
  120.     setpts->type = inlink->type;
  121.     setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
  122.     setpts->var_values[VAR_RTCSTART] = av_gettime();
  123.  
  124.     setpts->var_values[VAR_SR] =
  125.     setpts->var_values[VAR_SAMPLE_RATE] =
  126.         setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
  127.  
  128.     setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num && inlink->frame_rate.den ?
  129.         av_q2d(inlink->frame_rate) : NAN;
  130.  
  131.     av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
  132.            setpts->var_values[VAR_TB],
  133.            setpts->var_values[VAR_FRAME_RATE],
  134.            setpts->var_values[VAR_SAMPLE_RATE]);
  135.     return 0;
  136. }
  137.  
  138. #define D2TS(d)  (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
  139. #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
  140. #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
  141.  
  142. #define BUF_SIZE 64
  143.  
  144. static inline char *double2int64str(char *buf, double v)
  145. {
  146.     if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
  147.     else          snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
  148.     return buf;
  149. }
  150.  
  151. #define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
  152.  
  153. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
  154. {
  155.     SetPTSContext *setpts = inlink->dst->priv;
  156.     int64_t in_pts = frame->pts;
  157.     double d;
  158.  
  159.     if (isnan(setpts->var_values[VAR_STARTPTS])) {
  160.         setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
  161.         setpts->var_values[VAR_STARTT  ] = TS2T(frame->pts, inlink->time_base);
  162.     }
  163.     setpts->var_values[VAR_PTS       ] = TS2D(frame->pts);
  164.     setpts->var_values[VAR_T         ] = TS2T(frame->pts, inlink->time_base);
  165.     setpts->var_values[VAR_POS       ] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);
  166.     setpts->var_values[VAR_RTCTIME   ] = av_gettime();
  167.  
  168.     if (inlink->type == AVMEDIA_TYPE_VIDEO) {
  169.         setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
  170.     } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
  171.         setpts->var_values[VAR_S] = frame->nb_samples;
  172.         setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;
  173.     }
  174.  
  175.     d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
  176.     frame->pts = D2TS(d);
  177.  
  178.     av_log(inlink->dst, AV_LOG_DEBUG,
  179.            "N:%"PRId64" PTS:%s T:%f POS:%s",
  180.            (int64_t)setpts->var_values[VAR_N],
  181.            d2istr(setpts->var_values[VAR_PTS]),
  182.            setpts->var_values[VAR_T],
  183.            d2istr(setpts->var_values[VAR_POS]));
  184.     switch (inlink->type) {
  185.     case AVMEDIA_TYPE_VIDEO:
  186.         av_log(inlink->dst, AV_LOG_DEBUG, " INTERLACED:%"PRId64,
  187.                (int64_t)setpts->var_values[VAR_INTERLACED]);
  188.         break;
  189.     case AVMEDIA_TYPE_AUDIO:
  190.         av_log(inlink->dst, AV_LOG_DEBUG, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
  191.                (int64_t)setpts->var_values[VAR_NB_SAMPLES],
  192.                (int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
  193.         break;
  194.     }
  195.     av_log(inlink->dst, AV_LOG_DEBUG, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
  196.  
  197.     if (inlink->type == AVMEDIA_TYPE_VIDEO) {
  198.         setpts->var_values[VAR_N] += 1.0;
  199.     } else {
  200.         setpts->var_values[VAR_N] += frame->nb_samples;
  201.     }
  202.  
  203.     setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
  204.     setpts->var_values[VAR_PREV_INT   ] = TS2T(in_pts, inlink->time_base);
  205.     setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
  206.     setpts->var_values[VAR_PREV_OUTT]   = TS2T(frame->pts, inlink->time_base);
  207.     if (setpts->type == AVMEDIA_TYPE_AUDIO) {
  208.         setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
  209.     }
  210.     return ff_filter_frame(inlink->dst->outputs[0], frame);
  211. }
  212.  
  213. static av_cold void uninit(AVFilterContext *ctx)
  214. {
  215.     SetPTSContext *setpts = ctx->priv;
  216.     av_expr_free(setpts->expr);
  217.     setpts->expr = NULL;
  218. }
  219.  
  220. #define OFFSET(x) offsetof(SetPTSContext, x)
  221. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
  222. static const AVOption options[] = {
  223.     { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
  224.     { NULL }
  225. };
  226.  
  227. #if CONFIG_SETPTS_FILTER
  228. #define setpts_options options
  229. AVFILTER_DEFINE_CLASS(setpts);
  230.  
  231. static const AVFilterPad avfilter_vf_setpts_inputs[] = {
  232.     {
  233.         .name         = "default",
  234.         .type         = AVMEDIA_TYPE_VIDEO,
  235.         .config_props = config_input,
  236.         .filter_frame = filter_frame,
  237.     },
  238.     { NULL }
  239. };
  240.  
  241. static const AVFilterPad avfilter_vf_setpts_outputs[] = {
  242.     {
  243.         .name = "default",
  244.         .type = AVMEDIA_TYPE_VIDEO,
  245.     },
  246.     { NULL }
  247. };
  248.  
  249. AVFilter avfilter_vf_setpts = {
  250.     .name      = "setpts",
  251.     .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
  252.     .init      = init,
  253.     .uninit    = uninit,
  254.  
  255.     .priv_size = sizeof(SetPTSContext),
  256.     .priv_class = &setpts_class,
  257.  
  258.     .inputs    = avfilter_vf_setpts_inputs,
  259.     .outputs   = avfilter_vf_setpts_outputs,
  260. };
  261. #endif /* CONFIG_SETPTS_FILTER */
  262.  
  263. #if CONFIG_ASETPTS_FILTER
  264.  
  265. #define asetpts_options options
  266. AVFILTER_DEFINE_CLASS(asetpts);
  267.  
  268. static const AVFilterPad asetpts_inputs[] = {
  269.     {
  270.         .name         = "default",
  271.         .type         = AVMEDIA_TYPE_AUDIO,
  272.         .config_props = config_input,
  273.         .filter_frame = filter_frame,
  274.     },
  275.     { NULL }
  276. };
  277.  
  278. static const AVFilterPad asetpts_outputs[] = {
  279.     {
  280.         .name = "default",
  281.         .type = AVMEDIA_TYPE_AUDIO,
  282.     },
  283.     { NULL }
  284. };
  285.  
  286. AVFilter avfilter_af_asetpts = {
  287.     .name        = "asetpts",
  288.     .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
  289.     .init        = init,
  290.     .uninit      = uninit,
  291.     .priv_size   = sizeof(SetPTSContext),
  292.     .priv_class  = &asetpts_class,
  293.     .inputs      = asetpts_inputs,
  294.     .outputs     = asetpts_outputs,
  295. };
  296. #endif /* CONFIG_ASETPTS_FILTER */
  297.