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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 <inttypes.h>
  28.  
  29. #include "libavutil/eval.h"
  30. #include "libavutil/internal.h"
  31. #include "libavutil/mathematics.h"
  32. #include "libavutil/opt.h"
  33. #include "libavutil/time.h"
  34. #include "audio.h"
  35. #include "avfilter.h"
  36. #include "internal.h"
  37. #include "video.h"
  38.  
  39. static const char *const var_names[] = {
  40.     "FRAME_RATE",  ///< defined only for constant frame-rate video
  41.     "INTERLACED",  ///< tell if the current frame is interlaced
  42.     "N",           ///< frame / sample number (starting at zero)
  43.     "NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
  44.     "NB_SAMPLES",  ///< number of samples in the current frame (only audio)
  45.     "POS",         ///< original position in the file of the frame
  46.     "PREV_INPTS",  ///< previous  input PTS
  47.     "PREV_INT",    ///< previous  input time in seconds
  48.     "PREV_OUTPTS", ///< previous output PTS
  49.     "PREV_OUTT",   ///< previous output time in seconds
  50.     "PTS",         ///< original pts in the file of the frame
  51.     "SAMPLE_RATE", ///< sample rate (only audio)
  52.     "STARTPTS",    ///< PTS at start of movie
  53.     "STARTT",      ///< time at start of movie
  54.     "T",           ///< original time in the file of the frame
  55.     "TB",          ///< timebase
  56.     "RTCTIME",     ///< wallclock (RTC) time in micro seconds
  57.     "RTCSTART",    ///< wallclock (RTC) time at the start of the movie in micro seconds
  58.     "S",           //   Number of samples in the current frame
  59.     "SR",          //   Audio sample rate
  60.     NULL
  61. };
  62.  
  63. enum var_name {
  64.     VAR_FRAME_RATE,
  65.     VAR_INTERLACED,
  66.     VAR_N,
  67.     VAR_NB_CONSUMED_SAMPLES,
  68.     VAR_NB_SAMPLES,
  69.     VAR_POS,
  70.     VAR_PREV_INPTS,
  71.     VAR_PREV_INT,
  72.     VAR_PREV_OUTPTS,
  73.     VAR_PREV_OUTT,
  74.     VAR_PTS,
  75.     VAR_SAMPLE_RATE,
  76.     VAR_STARTPTS,
  77.     VAR_STARTT,
  78.     VAR_T,
  79.     VAR_TB,
  80.     VAR_RTCTIME,
  81.     VAR_RTCSTART,
  82.     VAR_S,
  83.     VAR_SR,
  84.     VAR_VARS_NB
  85. };
  86.  
  87. typedef struct SetPTSContext {
  88.     const AVClass *class;
  89.     char *expr_str;
  90.     AVExpr *expr;
  91.     double var_values[VAR_VARS_NB];
  92.     enum AVMediaType type;
  93. } SetPTSContext;
  94.  
  95. static av_cold int init(AVFilterContext *ctx)
  96. {
  97.     SetPTSContext *setpts = ctx->priv;
  98.     int ret;
  99.  
  100.     if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
  101.                              var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
  102.         av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
  103.         return ret;
  104.     }
  105.  
  106.     setpts->var_values[VAR_N]           = 0.0;
  107.     setpts->var_values[VAR_S]           = 0.0;
  108.     setpts->var_values[VAR_PREV_INPTS]  = NAN;
  109.     setpts->var_values[VAR_PREV_INT]    = NAN;
  110.     setpts->var_values[VAR_PREV_OUTPTS] = NAN;
  111.     setpts->var_values[VAR_PREV_OUTT]   = NAN;
  112.     setpts->var_values[VAR_STARTPTS]    = NAN;
  113.     setpts->var_values[VAR_STARTT]      = NAN;
  114.     return 0;
  115. }
  116.  
  117. static int config_input(AVFilterLink *inlink)
  118. {
  119.     AVFilterContext *ctx = inlink->dst;
  120.     SetPTSContext *setpts = ctx->priv;
  121.  
  122.     setpts->type = inlink->type;
  123.     setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
  124.     setpts->var_values[VAR_RTCSTART] = av_gettime();
  125.  
  126.     setpts->var_values[VAR_SR] =
  127.     setpts->var_values[VAR_SAMPLE_RATE] =
  128.         setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
  129.  
  130.     setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num && inlink->frame_rate.den ?
  131.         av_q2d(inlink->frame_rate) : NAN;
  132.  
  133.     av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
  134.            setpts->var_values[VAR_TB],
  135.            setpts->var_values[VAR_FRAME_RATE],
  136.            setpts->var_values[VAR_SAMPLE_RATE]);
  137.     return 0;
  138. }
  139.  
  140. #define D2TS(d)  (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
  141. #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
  142. #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
  143.  
  144. #define BUF_SIZE 64
  145.  
  146. static inline char *double2int64str(char *buf, double v)
  147. {
  148.     if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
  149.     else          snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
  150.     return buf;
  151. }
  152.  
  153. #define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
  154.  
  155. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
  156. {
  157.     SetPTSContext *setpts = inlink->dst->priv;
  158.     int64_t in_pts = frame->pts;
  159.     double d;
  160.  
  161.     if (isnan(setpts->var_values[VAR_STARTPTS])) {
  162.         setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
  163.         setpts->var_values[VAR_STARTT  ] = TS2T(frame->pts, inlink->time_base);
  164.     }
  165.     setpts->var_values[VAR_PTS       ] = TS2D(frame->pts);
  166.     setpts->var_values[VAR_T         ] = TS2T(frame->pts, inlink->time_base);
  167.     setpts->var_values[VAR_POS       ] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);
  168.     setpts->var_values[VAR_RTCTIME   ] = av_gettime();
  169.  
  170.     if (inlink->type == AVMEDIA_TYPE_VIDEO) {
  171.         setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
  172.     } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
  173.         setpts->var_values[VAR_S] = frame->nb_samples;
  174.         setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;
  175.     }
  176.  
  177.     d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
  178.     frame->pts = D2TS(d);
  179.  
  180.     av_log(inlink->dst, AV_LOG_TRACE,
  181.             "N:%"PRId64" PTS:%s T:%f POS:%s",
  182.             (int64_t)setpts->var_values[VAR_N],
  183.             d2istr(setpts->var_values[VAR_PTS]),
  184.             setpts->var_values[VAR_T],
  185.             d2istr(setpts->var_values[VAR_POS]));
  186.     switch (inlink->type) {
  187.     case AVMEDIA_TYPE_VIDEO:
  188.         av_log(inlink->dst, AV_LOG_TRACE, " INTERLACED:%"PRId64,
  189.                 (int64_t)setpts->var_values[VAR_INTERLACED]);
  190.         break;
  191.     case AVMEDIA_TYPE_AUDIO:
  192.         av_log(inlink->dst, AV_LOG_TRACE, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
  193.                 (int64_t)setpts->var_values[VAR_NB_SAMPLES],
  194.                 (int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
  195.         break;
  196.     }
  197.     av_log(inlink->dst, AV_LOG_TRACE, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
  198.  
  199.     if (inlink->type == AVMEDIA_TYPE_VIDEO) {
  200.         setpts->var_values[VAR_N] += 1.0;
  201.     } else {
  202.         setpts->var_values[VAR_N] += frame->nb_samples;
  203.     }
  204.  
  205.     setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
  206.     setpts->var_values[VAR_PREV_INT   ] = TS2T(in_pts, inlink->time_base);
  207.     setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
  208.     setpts->var_values[VAR_PREV_OUTT]   = TS2T(frame->pts, inlink->time_base);
  209.     if (setpts->type == AVMEDIA_TYPE_AUDIO) {
  210.         setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
  211.     }
  212.     return ff_filter_frame(inlink->dst->outputs[0], frame);
  213. }
  214.  
  215. static av_cold void uninit(AVFilterContext *ctx)
  216. {
  217.     SetPTSContext *setpts = ctx->priv;
  218.     av_expr_free(setpts->expr);
  219.     setpts->expr = NULL;
  220. }
  221.  
  222. #define OFFSET(x) offsetof(SetPTSContext, x)
  223. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
  224. static const AVOption options[] = {
  225.     { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
  226.     { NULL }
  227. };
  228.  
  229. #if CONFIG_SETPTS_FILTER
  230. #define setpts_options options
  231. AVFILTER_DEFINE_CLASS(setpts);
  232.  
  233. static const AVFilterPad avfilter_vf_setpts_inputs[] = {
  234.     {
  235.         .name         = "default",
  236.         .type         = AVMEDIA_TYPE_VIDEO,
  237.         .config_props = config_input,
  238.         .filter_frame = filter_frame,
  239.     },
  240.     { NULL }
  241. };
  242.  
  243. static const AVFilterPad avfilter_vf_setpts_outputs[] = {
  244.     {
  245.         .name = "default",
  246.         .type = AVMEDIA_TYPE_VIDEO,
  247.     },
  248.     { NULL }
  249. };
  250.  
  251. AVFilter ff_vf_setpts = {
  252.     .name      = "setpts",
  253.     .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
  254.     .init      = init,
  255.     .uninit    = uninit,
  256.  
  257.     .priv_size = sizeof(SetPTSContext),
  258.     .priv_class = &setpts_class,
  259.  
  260.     .inputs    = avfilter_vf_setpts_inputs,
  261.     .outputs   = avfilter_vf_setpts_outputs,
  262. };
  263. #endif /* CONFIG_SETPTS_FILTER */
  264.  
  265. #if CONFIG_ASETPTS_FILTER
  266.  
  267. #define asetpts_options options
  268. AVFILTER_DEFINE_CLASS(asetpts);
  269.  
  270. static const AVFilterPad asetpts_inputs[] = {
  271.     {
  272.         .name         = "default",
  273.         .type         = AVMEDIA_TYPE_AUDIO,
  274.         .config_props = config_input,
  275.         .filter_frame = filter_frame,
  276.     },
  277.     { NULL }
  278. };
  279.  
  280. static const AVFilterPad asetpts_outputs[] = {
  281.     {
  282.         .name = "default",
  283.         .type = AVMEDIA_TYPE_AUDIO,
  284.     },
  285.     { NULL }
  286. };
  287.  
  288. AVFilter ff_af_asetpts = {
  289.     .name        = "asetpts",
  290.     .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
  291.     .init        = init,
  292.     .uninit      = uninit,
  293.     .priv_size   = sizeof(SetPTSContext),
  294.     .priv_class  = &asetpts_class,
  295.     .inputs      = asetpts_inputs,
  296.     .outputs     = asetpts_outputs,
  297. };
  298. #endif /* CONFIG_ASETPTS_FILTER */
  299.