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lavfi/aevalsrc: duplicate last expression for the missing channels 

Use last expression for the missing channel expressions in case the
channel layout was specified. Enhance flexibility.
This commit is contained in:
Stefano Sabatini 2013-12-06 10:26:11 +01:00
parent 5b073da7a1
commit 405b3eb535
3 changed files with 26 additions and 13 deletions
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3
doc/filters.texi
View File

@ -1896,7 +1896,8 @@ This source accepts the following options:
@item exprs
Set the '|'-separated expressions list for each separate channel. In case the
@option{channel_layout} option is not specified, the selected channel layout
depends on the number of provided expressions.
depends on the number of provided expressions. Otherwise the last
specified expression is applied to the remaining output channels.
@item channel_layout, c
Set the channel layout. The number of channels in the specified layout

34
libavfilter/asrc_aevalsrc.c
View File

@ -85,7 +85,7 @@ static av_cold int init(AVFilterContext *ctx)
{
EvalContext *eval = ctx->priv;
char *args1 = av_strdup(eval->exprs);
char *expr, *buf;
char *expr, *last_expr, *buf;
int ret;
if (!args1) {
@ -94,27 +94,39 @@ static av_cold int init(AVFilterContext *ctx)
goto end;
}
#define ADD_EXPRESSION(expr_) do { \
if (!av_dynarray2_add((void **)&eval->expr, &eval->nb_channels, \
sizeof(*eval->expr), NULL)) { \
ret = AVERROR(ENOMEM); \
goto end; \
} \
eval->expr[eval->nb_channels-1] = NULL; \
ret = av_expr_parse(&eval->expr[eval->nb_channels - 1], expr_, \
var_names, NULL, NULL, \
NULL, NULL, 0, ctx); \
if (ret < 0) \
goto end; \
} while (0)
/* parse expressions */
buf = args1;
while (expr = av_strtok(buf, "|", &buf)) {
if (!av_dynarray2_add((void **)&eval->expr, &eval->nb_channels, sizeof(*eval->expr), NULL)) {
ret = AVERROR(ENOMEM);
goto end;
}
eval->expr[eval->nb_channels-1] = NULL;
ret = av_expr_parse(&eval->expr[eval->nb_channels - 1], expr, var_names,
NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0)
goto end;
ADD_EXPRESSION(expr);
last_expr = expr;
}
if (eval->chlayout_str) {
int n;
int i, n;
ret = ff_parse_channel_layout(&eval->chlayout, NULL, eval->chlayout_str, ctx);
if (ret < 0)
goto end;
n = av_get_channel_layout_nb_channels(eval->chlayout);
if (n > eval->nb_channels) {
for (i = eval->nb_channels; i < n; i++)
ADD_EXPRESSION(last_expr);
}
if (n != eval->nb_channels) {
av_log(ctx, AV_LOG_ERROR,
"Mismatch between the specified number of channels '%d' "

2
libavfilter/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 91
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \