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lavfi/volume: implement process_command() callback, with the volume command

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Address trac ticket #2868.
This commit is contained in:
Stefano Sabatini 2013-12-23 18:24:57 +01:00
parent 7619a87cc8
commit 97aa554634
3 changed files with 32 additions and 2 deletions
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15
doc/filters.texi
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@ -1828,7 +1828,8 @@ Set when the volume expression is evaluated.
It accepts the following values: It accepts the following values:
@table @samp @table @samp
@item once @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 @item frame
evaluate expression for each incoming 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 @var{sample_rate} and @var{tb} variables are available, all other
variables will evaluate to NAN. 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 @subsection Examples
@itemize @itemize

17
libavfilter/af_volume.c
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@ -296,6 +296,22 @@ static int config_output(AVFilterLink *outlink)
return set_volume(ctx); 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 D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb)) #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, .inputs = avfilter_af_volume_inputs,
.outputs = avfilter_af_volume_outputs, .outputs = avfilter_af_volume_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
.process_command = process_command,
}; };

2
libavfilter/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 4 #define LIBAVFILTER_VERSION_MAJOR 4
#define LIBAVFILTER_VERSION_MINOR 0 #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, \ #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \ LIBAVFILTER_VERSION_MINOR, \