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avfilter/setpts: add command support

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Add support for changing expr on the fly.

Signed-off-by: Oleg <oafanasiev@gmail.com>
This commit is contained in:
Oleg
2023-04-29 19:56:46 +01:00
committed by Stefano Sabatini
parent 6f1368842d
commit e700d87b20
3 changed files with 64 additions and 17 deletions
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73
libavfilter/setpts.c
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@@ -63,6 +63,7 @@ static const char *const var_names[] = {
"S", // Number of samples in the current frame
"SR", // Audio sample rate
"FR", ///< defined only for constant frame-rate video
"T_CHANGE", ///< time of first frame after latest command was applied
NULL
};
@@ -90,7 +91,8 @@ enum var_name {
VAR_S,
VAR_SR,
VAR_FR,
VAR_VARS_NB
VAR_T_CHANGE,
VAR_VARS_NB,
};
typedef struct SetPTSContext {
@@ -120,6 +122,7 @@ static av_cold int init(AVFilterContext *ctx)
setpts->var_values[VAR_PREV_OUTT] = NAN;
setpts->var_values[VAR_STARTPTS] = NAN;
setpts->var_values[VAR_STARTT] = NAN;
setpts->var_values[VAR_T_CHANGE] = NAN;
return 0;
}
@@ -163,6 +166,9 @@ static double eval_pts(SetPTSContext *setpts, AVFilterLink *inlink, AVFrame *fra
setpts->var_values[VAR_STARTPTS] = TS2D(pts);
setpts->var_values[VAR_STARTT ] = TS2T(pts, inlink->time_base);
}
if (isnan(setpts->var_values[VAR_T_CHANGE])) {
setpts->var_values[VAR_T_CHANGE] = TS2T(pts, inlink->time_base);
}
setpts->var_values[VAR_PTS ] = TS2D(pts);
setpts->var_values[VAR_T ] = TS2T(pts, inlink->time_base);
#if FF_API_FRAME_PKT
@@ -269,14 +275,45 @@ static av_cold void uninit(AVFilterContext *ctx)
setpts->expr = NULL;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *arg,
char *res, int res_len, int flags)
{
SetPTSContext *setpts = ctx->priv;
AVExpr *new_expr;
int ret;
ret = ff_filter_process_command(ctx, cmd, arg, res, res_len, flags);
if (ret < 0)
return ret;
if (!strcmp(cmd, "expr")) {
ret = av_expr_parse(&new_expr, arg, var_names, NULL, NULL, NULL, NULL, 0, ctx);
// Only free and replace previous expression if new one succeeds,
// otherwise defensively keep everything intact even if reporting an error.
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", arg);
} else {
av_expr_free(setpts->expr);
setpts->expr = new_expr;
setpts->var_values[VAR_T_CHANGE] = NAN;
}
} else {
ret = AVERROR(EINVAL);
}
return ret;
}
#define OFFSET(x) offsetof(SetPTSContext, x)
#define V AV_OPT_FLAG_VIDEO_PARAM
#define A AV_OPT_FLAG_AUDIO_PARAM
#define R AV_OPT_FLAG_RUNTIME_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
#if CONFIG_SETPTS_FILTER
static const AVOption setpts_options[] = {
{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = V|F },
{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = V|F|R },
{ NULL }
};
AVFILTER_DEFINE_CLASS(setpts);
@@ -297,12 +334,13 @@ static const AVFilterPad avfilter_vf_setpts_outputs[] = {
};
const AVFilter ff_vf_setpts = {
.name = "setpts",
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
.init = init,
.activate = activate,
.uninit = uninit,
.flags = AVFILTER_FLAG_METADATA_ONLY,
.name = "setpts",
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
.init = init,
.activate = activate,
.uninit = uninit,
.process_command = process_command,
.flags = AVFILTER_FLAG_METADATA_ONLY,
.priv_size = sizeof(SetPTSContext),
.priv_class = &setpts_class,
@@ -315,7 +353,7 @@ const AVFilter ff_vf_setpts = {
#if CONFIG_ASETPTS_FILTER
static const AVOption asetpts_options[] = {
{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = A|F },
{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = A|F|R },
{ NULL }
};
AVFILTER_DEFINE_CLASS(asetpts);
@@ -336,14 +374,15 @@ static const AVFilterPad asetpts_outputs[] = {
};
const AVFilter ff_af_asetpts = {
.name = "asetpts",
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
.init = init,
.activate = activate,
.uninit = uninit,
.priv_size = sizeof(SetPTSContext),
.priv_class = &asetpts_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
.name = "asetpts",
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
.init = init,
.activate = activate,
.uninit = uninit,
.process_command = process_command,
.priv_size = sizeof(SetPTSContext),
.priv_class = &asetpts_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(asetpts_inputs),
FILTER_OUTPUTS(asetpts_outputs),
};