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lavfi: add asetpts audio filter

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Based on an idea by Andrey Utkin <andrey.krieger.utkin@gmail.com>.
This commit is contained in:
Stefano Sabatini 2012-08-08 13:44:11 +02:00
parent 11a1033c9f
commit f6580b50ed
6 changed files with 92 additions and 12 deletions
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1
Changelog
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@ -43,6 +43,7 @@ version next:
- MP2 encoding via TwoLAME
- bmp parser
- smptebars source
- asetpts filter
version 0.11:

19
doc/filters.texi
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@ -3032,9 +3032,11 @@ Mark the frame as top-field-first.
Mark the frame as progressive.
@end table
@section setpts
@section asetpts, setpts
Change the PTS (presentation timestamp) of the input video frames.
Change the PTS (presentation timestamp) of the input frames.
@code{asetpts} works on audio frames, @code{setpts} on video frames.
Accept in input an expression evaluated through the eval API, which
can contain the following constants:
@ -3046,6 +3048,16 @@ the presentation timestamp in input
@item N
the count of the input frame, starting from 0.
@item NB_CONSUMED_SAMPLES
the number of consumed samples, not including the current frame (only
audio)
@item NB_SAMPLES
the number of samples in the current frame (only audio)
@item SAMPLE_RATE
audio sample rate
@item STARTPTS
the PTS of the first video frame
@ -3084,6 +3096,9 @@ setpts=N/(25*TB)
# fixed rate 25 fps with some jitter
setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
# apply an offset of 10 seconds to the input PTS
setpts=PTS+10/TB
@end example
@section settb, asettb

1
libavfilter/Makefile
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@ -52,6 +52,7 @@ OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o
OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o
OBJS-$(CONFIG_ARESAMPLE_FILTER) += af_aresample.o
OBJS-$(CONFIG_ASETNSAMPLES_FILTER) += af_asetnsamples.o
OBJS-$(CONFIG_ASETPTS_FILTER) += vf_setpts.o
OBJS-$(CONFIG_ASETTB_FILTER) += f_settb.o
OBJS-$(CONFIG_ASHOWINFO_FILTER) += af_ashowinfo.o
OBJS-$(CONFIG_ASPLIT_FILTER) += split.o

1
libavfilter/allfilters.c
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@ -42,6 +42,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (ANULL, anull, af);
REGISTER_FILTER (ARESAMPLE, aresample, af);
REGISTER_FILTER (ASETNSAMPLES, asetnsamples, af);
REGISTER_FILTER (ASETPTS, asetpts, af);
REGISTER_FILTER (ASETTB, asettb, af);
REGISTER_FILTER (ASHOWINFO, ashowinfo, af);
REGISTER_FILTER (ASPLIT, asplit, af);

2
libavfilter/version.h
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@ -29,7 +29,7 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 6
#define LIBAVFILTER_VERSION_MINOR 7
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

80
libavfilter/vf_setpts.c
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@ -30,16 +30,20 @@
#include "libavutil/mathematics.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"
#include "video.h"
static const char *const var_names[] = {
"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_OUTPTS", ///< previous output PTS
"PTS", ///< original pts in the file of the frame
"STARTPTS", ///< PTS at start of movie
"SAMPLE_RATE", ///< sample rate (only audio)
"STARTPTS", ///< PTS at start of movie
"TB", ///< timebase
NULL
};
@ -47,10 +51,13 @@ static const char *const var_names[] = {
enum var_name {
VAR_INTERLACED,
VAR_N,
VAR_NB_CONSUMED_SAMPLES,
VAR_NB_SAMPLES,
VAR_POS,
VAR_PREV_INPTS,
VAR_PREV_OUTPTS,
VAR_PTS,
VAR_SAMPLE_RATE,
VAR_STARTPTS,
VAR_TB,
VAR_VARS_NB
@ -59,6 +66,7 @@ enum var_name {
typedef struct {
AVExpr *expr;
double var_values[VAR_VARS_NB];
enum AVMediaType type;
} SetPTSContext;
static av_cold int init(AVFilterContext *ctx, const char *args)
@ -81,18 +89,24 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
static int config_input(AVFilterLink *inlink)
{
SetPTSContext *setpts = inlink->dst->priv;
AVFilterContext *ctx = inlink->dst;
SetPTSContext *setpts = ctx->priv;
setpts->type = inlink->type;
setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
if (setpts->type == AVMEDIA_TYPE_AUDIO)
setpts->var_values[VAR_SAMPLE_RATE] = inlink->sample_rate;
av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f SAMPLE_RATE:%f\n",
setpts->var_values[VAR_TB], 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))
static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
{
SetPTSContext *setpts = inlink->dst->priv;
double d;
@ -103,28 +117,45 @@ static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
if (isnan(setpts->var_values[VAR_STARTPTS]))
setpts->var_values[VAR_STARTPTS] = TS2D(inpicref->pts);
setpts->var_values[VAR_INTERLACED] = inpicref->video->interlaced;
setpts->var_values[VAR_PTS ] = TS2D(inpicref->pts);
setpts->var_values[VAR_POS ] = inpicref->pos == -1 ? NAN : inpicref->pos;
switch (inlink->type) {
case AVMEDIA_TYPE_VIDEO:
setpts->var_values[VAR_INTERLACED] = inpicref->video->interlaced;
break;
case AVMEDIA_TYPE_AUDIO:
setpts->var_values[VAR_NB_SAMPLES] = inpicref->audio->nb_samples;
break;
}
d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
outpicref->pts = D2TS(d);
#ifdef DEBUG
av_log(inlink->dst, AV_LOG_DEBUG,
"n:%"PRId64" interlaced:%d pos:%"PRId64" pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
"n:%"PRId64" interlaced:%d nb_samples:%d nb_consumed_samples:%d "
"pos:%"PRId64" pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
(int64_t)setpts->var_values[VAR_N],
(int)setpts->var_values[VAR_INTERLACED],
(int)setpts->var_values[VAR_NB_SAMPLES],
(int)setpts->var_values[VAR_NB_CONSUMED_SAMPLES],
inpicref ->pos,
inpicref ->pts, inpicref ->pts * av_q2d(inlink->time_base),
outpicref->pts, outpicref->pts * av_q2d(inlink->time_base));
#endif
setpts->var_values[VAR_N] += 1.0;
setpts->var_values[VAR_PREV_INPTS ] = TS2D(inpicref ->pts);
setpts->var_values[VAR_PREV_OUTPTS] = TS2D(outpicref->pts);
return ff_start_frame(inlink->dst->outputs[0], outpicref);
if (setpts->type == AVMEDIA_TYPE_AUDIO) {
setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += inpicref->audio->nb_samples;
return ff_filter_samples(inlink->dst->outputs[0], outpicref);
} else
return ff_start_frame (inlink->dst->outputs[0], outpicref);
}
static av_cold void uninit(AVFilterContext *ctx)
@ -134,6 +165,36 @@ static av_cold void uninit(AVFilterContext *ctx)
setpts->expr = NULL;
}
#if CONFIG_ASETPTS_FILTER
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 = (const AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.get_audio_buffer = ff_null_get_audio_buffer,
.config_props = config_input,
.filter_samples = filter_frame,
},
{ .name = NULL }
},
.outputs = (const AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ .name = NULL }
},
};
#endif /* CONFIG_ASETPTS_FILTER */
#if CONFIG_SETPTS_FILTER
AVFilter avfilter_vf_setpts = {
.name = "setpts",
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
@ -146,9 +207,10 @@ AVFilter avfilter_vf_setpts = {
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = ff_null_get_video_buffer,
.config_props = config_input,
.start_frame = start_frame, },
.start_frame = filter_frame, },
{ .name = NULL }},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};
#endif /* CONFIG_SETPTS_FILTER */