From ad8159e0fe2bfc1c34739f0956ce464f9859b5a7 Mon Sep 17 00:00:00 2001 From: Nicolas George Date: Thu, 3 Apr 2014 15:42:22 +0200 Subject: [PATCH] libavfilter: Add asettb filter for setting timebase for audio Ported asettb (including the sr option for audio sample rate) from FFmpeg, and copied/modified the existing settb documentation for asettb. Signed-off-by: Katerina Barone-Adesi Signed-off-by: Anton Khirnov --- Changelog | 1 + doc/filters.texi | 41 +++++++++++++++++++++++++++++++++++++++++ libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/settb.c | 47 +++++++++++++++++++++++++++++++++++++++++++++-- libavfilter/version.h | 2 +- 6 files changed, 90 insertions(+), 3 deletions(-) diff --git a/Changelog b/Changelog index 5380565..55216e8 100644 --- a/Changelog +++ b/Changelog @@ -18,6 +18,7 @@ version : - LucasArts SMUSH VIMA audio decoder (ADPCM) - LucasArts SMUSH demuxer - MP2 encoding via TwoLAME +- asettb filter version 10: diff --git a/doc/filters.texi b/doc/filters.texi index f986623..c34aef2 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -260,6 +260,47 @@ asetpts=expr=N/SR/TB asetpts='(RTCTIME - RTCSTART) / (TB * 1000000)" @end example +@section asettb + +Set the timebase to use for the output frames timestamps. +It is mainly useful for testing timebase configuration. + +This filter accepts the following parameters: + +@table @option + +@item expr +The expression which is evaluated into the output timebase. + +@end table + +The expression can contain the constants @var{PI}, @var{E}, @var{PHI}, @var{AVTB} (the +default timebase), @var{intb} (the input timebase), and @var{sr} (the sample rate, +audio only). + +The default value for the input is @var{intb}. + +Some examples: + +@example +# Set the timebase to 1/25: +settb=1/25 + +# Set the timebase to 1/10: +settb=0.1 + +# Set the timebase to 1001/1000: +settb=1+0.001 + +# Set the timebase to 2*intb: +settb=2*intb + +# Set the default timebase value: +settb=AVTB + +# Set the timebase to twice the sample rate: +asettb=sr*2 +@end example @section ashowinfo diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 1f5e433..9c5c666 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -28,6 +28,7 @@ OBJS-$(CONFIG_AFORMAT_FILTER) += af_aformat.o OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o OBJS-$(CONFIG_ASETPTS_FILTER) += setpts.o +OBJS-$(CONFIG_ASETTB_FILTER) += settb.o OBJS-$(CONFIG_ASHOWINFO_FILTER) += af_ashowinfo.o OBJS-$(CONFIG_ASPLIT_FILTER) += split.o OBJS-$(CONFIG_ASYNCTS_FILTER) += af_asyncts.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index ddca153..d7bb47a 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -48,6 +48,7 @@ void avfilter_register_all(void) REGISTER_FILTER(AMIX, amix, af); REGISTER_FILTER(ANULL, anull, af); REGISTER_FILTER(ASETPTS, asetpts, af); + REGISTER_FILTER(ASETTB, asettb, af); REGISTER_FILTER(ASHOWINFO, ashowinfo, af); REGISTER_FILTER(ASPLIT, asplit, af); REGISTER_FILTER(ASYNCTS, asyncts, af); diff --git a/libavfilter/settb.c b/libavfilter/settb.c index 87b60a7..962e7b3 100644 --- a/libavfilter/settb.c +++ b/libavfilter/settb.c @@ -32,6 +32,7 @@ #include "libavutil/mathematics.h" #include "libavutil/opt.h" #include "libavutil/rational.h" +#include "audio.h" #include "avfilter.h" #include "internal.h" #include "video.h" @@ -42,6 +43,7 @@ static const char *const var_names[] = { "PI", "AVTB", /* default timebase 1/AV_TIME_BASE */ "intb", /* input timebase */ + "sr", /* sample rate */ NULL }; @@ -51,6 +53,7 @@ enum var_name { VAR_PI, VAR_AVTB, VAR_INTB, + VAR_SR, VAR_VARS_NB }; @@ -74,6 +77,7 @@ static int config_output_props(AVFilterLink *outlink) settb->var_values[VAR_PI] = M_PI; settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q); settb->var_values[VAR_INTB] = av_q2d(inlink->time_base); + settb->var_values[VAR_SR] = inlink->sample_rate; outlink->w = inlink->w; outlink->h = inlink->h; @@ -116,12 +120,13 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame) } #define OFFSET(x) offsetof(SetTBContext, x) -#define FLAGS AV_OPT_FLAG_VIDEO_PARAM +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM static const AVOption options[] = { { "expr", "Expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, { .str = "intb" }, .flags = FLAGS }, { NULL }, }; +#if CONFIG_SETTB_FILTER static const AVClass settb_class = { .class_name = "settb", .item_name = av_default_item_name, @@ -150,7 +155,7 @@ static const AVFilterPad avfilter_vf_settb_outputs[] = { AVFilter ff_vf_settb = { .name = "settb", - .description = NULL_IF_CONFIG_SMALL("Set timebase for the output link."), + .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."), .priv_size = sizeof(SetTBContext), .priv_class = &settb_class, @@ -159,3 +164,41 @@ AVFilter ff_vf_settb = { .outputs = avfilter_vf_settb_outputs, }; +#endif /* CONFIG_SETTB_FILTER */ + +#if CONFIG_ASETTB_FILTER +static const AVClass asettb_class = { + .class_name = "asettb", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +static const AVFilterPad avfilter_af_asettb_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .get_audio_buffer = ff_null_get_audio_buffer, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad avfilter_af_asettb_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .config_props = config_output_props, + }, + { NULL } +}; + +AVFilter ff_af_asettb = { + .name = "asettb", + .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."), + .priv_size = sizeof(SetTBContext), + .inputs = avfilter_af_asettb_inputs, + .outputs = avfilter_af_asettb_outputs, + .priv_class = &asettb_class, +}; +#endif /* CONFIG_ASETTB_FILTER */ diff --git a/libavfilter/version.h b/libavfilter/version.h index 1fd0eb6..5093e50 100644 --- a/libavfilter/version.h +++ b/libavfilter/version.h @@ -30,7 +30,7 @@ #include "libavutil/version.h" #define LIBAVFILTER_VERSION_MAJOR 4 -#define LIBAVFILTER_VERSION_MINOR 3 +#define LIBAVFILTER_VERSION_MINOR 4 #define LIBAVFILTER_VERSION_MICRO 0 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \ -- 2.7.4