summaryrefslogtreecommitdiff
path: root/libavfilter/setpts.c
blob: 9fa1df5a896e98e6be6841039962f7fd35854495 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/*
 * Copyright (c) 2010 Stefano Sabatini
 * Copyright (c) 2008 Victor Paesa
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; 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/opt.h"
#include "libavutil/time.h"

#include "audio.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"

#include "config.h"

static const char *const var_names[] = {
    "E",           ///< Euler number
    "INTERLACED",  ///< tell if the current frame is interlaced
    "N",           ///< frame / sample number (starting at zero)
    "PHI",         ///< golden ratio
    "PI",          ///< greek pi
    "PREV_INPTS",  ///< previous  input PTS
    "PREV_OUTPTS", ///< previous output PTS
    "PTS",         ///< original pts in the file of the frame
    "STARTPTS",    ///< PTS at start of movie
    "TB",          ///< timebase
    "RTCTIME",     ///< wallclock (RTC) time in micro seconds
    "RTCSTART",    ///< wallclock (RTC) time at the start of the movie in micro seconds
    "S",           //   Number of samples in the current frame
    "SR",          //   Audio sample rate
    NULL
};

enum var_name {
    VAR_E,
    VAR_INTERLACED,
    VAR_N,
    VAR_PHI,
    VAR_PI,
    VAR_PREV_INPTS,
    VAR_PREV_OUTPTS,
    VAR_PTS,
    VAR_STARTPTS,
    VAR_TB,
    VAR_RTCTIME,
    VAR_RTCSTART,
    VAR_S,
    VAR_SR,
    VAR_VARS_NB
};

typedef struct {
    const AVClass *class;
    char *expr_str;
    AVExpr *expr;
    double var_values[VAR_VARS_NB];
} SetPTSContext;

static av_cold int init(AVFilterContext *ctx)
{
    SetPTSContext *setpts = ctx->priv;
    int ret;

    if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
                             var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
        av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
        return ret;
    }

    setpts->var_values[VAR_E]           = M_E;
    setpts->var_values[VAR_N]           = 0.0;
    setpts->var_values[VAR_S]           = 0.0;
    setpts->var_values[VAR_PHI]         = M_PHI;
    setpts->var_values[VAR_PI]          = M_PI;
    setpts->var_values[VAR_PREV_INPTS]  = NAN;
    setpts->var_values[VAR_PREV_OUTPTS] = NAN;
    setpts->var_values[VAR_STARTPTS]    = NAN;
    return 0;
}

static int config_input(AVFilterLink *inlink)
{
    SetPTSContext *setpts = inlink->dst->priv;

    setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
    setpts->var_values[VAR_RTCSTART] = av_gettime();

    if (inlink->type == AVMEDIA_TYPE_AUDIO) {
        setpts->var_values[VAR_SR] = inlink->sample_rate;
    }

    av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
    return 0;
}

#define D2TS(d)  (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))

static int filter_frame(AVFilterLink *inlink, AVFrame *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_PTS       ] = TS2D(frame->pts);
    setpts->var_values[VAR_RTCTIME   ] = av_gettime();

    if (inlink->type == AVMEDIA_TYPE_VIDEO) {
        setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
    } else {
        setpts->var_values[VAR_S] = frame->nb_samples;
    }

    d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
    frame->pts = D2TS(d);

#ifdef DEBUG
    av_log(inlink->dst, AV_LOG_DEBUG,
           "n:%"PRId64" interlaced:%d pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
           (int64_t)setpts->var_values[VAR_N],
           (int)setpts->var_values[VAR_INTERLACED],
           in_pts, in_pts * av_q2d(inlink->time_base),
           frame->pts, frame->pts * av_q2d(inlink->time_base));
#endif


    if (inlink->type == AVMEDIA_TYPE_VIDEO) {
        setpts->var_values[VAR_N] += 1.0;
    } else {
        setpts->var_values[VAR_N] += frame->nb_samples;
    }

    setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
    setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
    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;
}

#define OFFSET(x) offsetof(SetPTSContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
static const AVOption options[] = {
    { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
    { NULL },
};

#if CONFIG_SETPTS_FILTER
static const AVClass setpts_class = {
    .class_name = "setpts",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

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),
    .priv_class = &setpts_class,

    .inputs    = avfilter_vf_setpts_inputs,
    .outputs   = avfilter_vf_setpts_outputs,
};
#endif

#if CONFIG_ASETPTS_FILTER
static const AVClass asetpts_class = {
    .class_name = "asetpts",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

static const AVFilterPad 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 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),
    .priv_class = &asetpts_class,

    .inputs    = asetpts_inputs,
    .outputs   = asetpts_outputs,
};
#endif