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-rw-r--r--libavfilter/f_setpts.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/libavfilter/f_setpts.c b/libavfilter/f_setpts.c
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+/*
+ * Copyright (c) 2010 Stefano Sabatini
+ * Copyright (c) 2008 Victor Paesa
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * video presentation timestamp (PTS) modification filter
+ */
+
+#include "libavutil/eval.h"
+#include "libavutil/internal.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/time.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "audio.h"
+#include "video.h"
+
+static const char *const var_names[] = {
+ "FRAME_RATE", ///< defined only for constant frame-rate video
+ "INTERLACED", ///< tell if the current frame is interlaced
+ "N", ///< frame number (starting at zero)
+ "NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
+ "NB_SAMPLES", ///< number of samples in the current frame (only audio)
+ "POS", ///< original position in the file of the frame
+ "PREV_INPTS", ///< previous input PTS
+ "PREV_INT", ///< previous input time in seconds
+ "PREV_OUTPTS", ///< previous output PTS
+ "PREV_OUTT", ///< previous output time in seconds
+ "PTS", ///< original pts in the file of the frame
+ "SAMPLE_RATE", ///< sample rate (only audio)
+ "STARTPTS", ///< PTS at start of movie
+ "STARTT", ///< time at start of movie
+ "T", ///< original time in the file of the frame
+ "TB", ///< timebase
+ "RTCTIME", ///< wallclock (RTC) time in micro seconds
+ "RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
+ NULL
+};
+
+enum var_name {
+ VAR_FRAME_RATE,
+ VAR_INTERLACED,
+ VAR_N,
+ VAR_NB_CONSUMED_SAMPLES,
+ VAR_NB_SAMPLES,
+ VAR_POS,
+ VAR_PREV_INPTS,
+ VAR_PREV_INT,
+ VAR_PREV_OUTPTS,
+ VAR_PREV_OUTT,
+ VAR_PTS,
+ VAR_SAMPLE_RATE,
+ VAR_STARTPTS,
+ VAR_STARTT,
+ VAR_T,
+ VAR_TB,
+ VAR_RTCTIME,
+ VAR_RTCSTART,
+ VAR_VARS_NB
+};
+
+typedef struct {
+ AVExpr *expr;
+ double var_values[VAR_VARS_NB];
+ enum AVMediaType type;
+} SetPTSContext;
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+ SetPTSContext *setpts = ctx->priv;
+ int ret;
+
+ if ((ret = av_expr_parse(&setpts->expr, args ? args : "PTS",
+ var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", args);
+ return ret;
+ }
+
+ setpts->var_values[VAR_N ] = 0.0;
+ setpts->var_values[VAR_PREV_INPTS ] = setpts->var_values[VAR_PREV_INT ] = NAN;
+ setpts->var_values[VAR_PREV_OUTPTS] = setpts->var_values[VAR_PREV_OUTT] = NAN;
+ setpts->var_values[VAR_STARTPTS ] = setpts->var_values[VAR_STARTT ] = NAN;
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ SetPTSContext *setpts = ctx->priv;
+
+ setpts->type = inlink->type;
+ setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
+ setpts->var_values[VAR_RTCSTART] = av_gettime();
+
+ setpts->var_values[VAR_SAMPLE_RATE] =
+ setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
+
+ setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num && inlink->frame_rate.den ?
+ av_q2d(inlink->frame_rate) : NAN;
+
+ av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
+ setpts->var_values[VAR_TB],
+ setpts->var_values[VAR_FRAME_RATE],
+ setpts->var_values[VAR_SAMPLE_RATE]);
+ return 0;
+}
+
+#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
+#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
+#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
+
+#define BUF_SIZE 64
+
+static inline char *double2int64str(char *buf, double v)
+{
+ if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
+ else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
+ return buf;
+}
+
+#define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
+
+static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
+{
+ SetPTSContext *setpts = inlink->dst->priv;
+ int64_t in_pts = frame->pts;
+ double d;
+
+ if (isnan(setpts->var_values[VAR_STARTPTS])) {
+ setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
+ setpts->var_values[VAR_STARTT ] = TS2T(frame->pts, inlink->time_base);
+ }
+ setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
+ setpts->var_values[VAR_T ] = TS2T(frame->pts, inlink->time_base);
+ setpts->var_values[VAR_POS ] = frame->pos == -1 ? NAN : frame->pos;
+ setpts->var_values[VAR_RTCTIME ] = av_gettime();
+
+ switch (inlink->type) {
+ case AVMEDIA_TYPE_VIDEO:
+ setpts->var_values[VAR_INTERLACED] = frame->video->interlaced;
+ break;
+
+ case AVMEDIA_TYPE_AUDIO:
+ setpts->var_values[VAR_NB_SAMPLES] = frame->audio->nb_samples;
+ break;
+ }
+
+ d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
+
+ av_log(inlink->dst, AV_LOG_DEBUG,
+ "N:%"PRId64" PTS:%s T:%f POS:%s",
+ (int64_t)setpts->var_values[VAR_N],
+ d2istr(setpts->var_values[VAR_PTS]),
+ setpts->var_values[VAR_T],
+ d2istr(setpts->var_values[VAR_POS]));
+ switch (inlink->type) {
+ case AVMEDIA_TYPE_VIDEO:
+ av_log(inlink->dst, AV_LOG_DEBUG, " INTERLACED:%"PRId64,
+ (int64_t)setpts->var_values[VAR_INTERLACED]);
+ break;
+ case AVMEDIA_TYPE_AUDIO:
+ av_log(inlink->dst, AV_LOG_DEBUG, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
+ (int64_t)setpts->var_values[VAR_NB_SAMPLES],
+ (int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
+ break;
+ }
+ av_log(inlink->dst, AV_LOG_DEBUG, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
+
+ frame->pts = D2TS(d);
+
+ setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
+ setpts->var_values[VAR_PREV_INT ] = TS2T(in_pts, inlink->time_base);
+ setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
+ setpts->var_values[VAR_PREV_OUTT] = TS2T(frame->pts, inlink->time_base);
+ setpts->var_values[VAR_N] += 1.0;
+ if (setpts->type == AVMEDIA_TYPE_AUDIO) {
+ setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->audio->nb_samples;
+ }
+ return ff_filter_frame(inlink->dst->outputs[0], frame);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ SetPTSContext *setpts = ctx->priv;
+ av_expr_free(setpts->expr);
+ setpts->expr = NULL;
+}
+
+#if CONFIG_ASETPTS_FILTER
+static const AVFilterPad avfilter_af_asetpts_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .get_audio_buffer = ff_null_get_audio_buffer,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad avfilter_af_asetpts_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_af_asetpts = {
+ .name = "asetpts",
+ .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
+ .init = init,
+ .uninit = uninit,
+ .priv_size = sizeof(SetPTSContext),
+ .inputs = avfilter_af_asetpts_inputs,
+ .outputs = avfilter_af_asetpts_outputs,
+};
+#endif /* CONFIG_ASETPTS_FILTER */
+
+#if CONFIG_SETPTS_FILTER
+static const AVFilterPad avfilter_vf_setpts_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad avfilter_vf_setpts_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_vf_setpts = {
+ .name = "setpts",
+ .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
+ .init = init,
+ .uninit = uninit,
+
+ .priv_size = sizeof(SetPTSContext),
+
+ .inputs = avfilter_vf_setpts_inputs,
+ .outputs = avfilter_vf_setpts_outputs,
+};
+#endif /* CONFIG_SETPTS_FILTER */
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