diff options
| -rw-r--r-- | doc/filters.texi | 15 | ||||
| -rw-r--r-- | libavfilter/af_volume.c | 17 | ||||
| -rw-r--r-- | libavfilter/version.h | 2 |
3 files changed, 32 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 548cb43801..a57996468f 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -1828,7 +1828,8 @@ Set when the volume expression is evaluated. It accepts the following values: @table @samp @item once -only evaluate expression once during the filter initialization +only evaluate expression once during the filter initialization, or +when the @samp{volume} command is sent @item frame evaluate expression for each incoming frame @@ -1870,6 +1871,18 @@ Note that when @option{eval} is set to @samp{once} only the @var{sample_rate} and @var{tb} variables are available, all other variables will evaluate to NAN. +@subsection Commands + +This filter supports the following commands: +@table @option +@item volume +Modify the volume expression. +The command accepts the same syntax of the corresponding option. + +If the specified expression is not valid, it is kept at its current +value. +@end table + @subsection Examples @itemize diff --git a/libavfilter/af_volume.c b/libavfilter/af_volume.c index b4ab6fee88..9dc868f91a 100644 --- a/libavfilter/af_volume.c +++ b/libavfilter/af_volume.c @@ -296,6 +296,22 @@ static int config_output(AVFilterLink *outlink) return set_volume(ctx); } +static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, + char *res, int res_len, int flags) +{ + VolumeContext *vol = ctx->priv; + int ret = AVERROR(ENOSYS); + + if (!strcmp(cmd, "volume")) { + if ((ret = set_expr(&vol->volume_pexpr, args, ctx)) < 0) + return ret; + if (vol->eval_mode == EVAL_MODE_ONCE) + set_volume(ctx); + } + + return ret; +} + #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)) @@ -403,4 +419,5 @@ AVFilter ff_af_volume = { .inputs = avfilter_af_volume_inputs, .outputs = avfilter_af_volume_outputs, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, + .process_command = process_command, }; diff --git a/libavfilter/version.h b/libavfilter/version.h index 59fef97891..51c049a209 100644 --- a/libavfilter/version.h +++ b/libavfilter/version.h @@ -31,7 +31,7 @@ #define LIBAVFILTER_VERSION_MAJOR 4 #define LIBAVFILTER_VERSION_MINOR 0 -#define LIBAVFILTER_VERSION_MICRO 101 +#define LIBAVFILTER_VERSION_MICRO 102 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \ LIBAVFILTER_VERSION_MINOR, \ |