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lavfi/hue: rework logic for setting commands 

In particular, fix h/H commands in case h and H are not specified as
initial parameters.
This commit is contained in:
Stefano Sabatini 2013-04-21 17:12:02 +02:00
parent b21b2ca95b
commit 638ffb2413
1 changed files with 39 additions and 16 deletions
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55
libavfilter/vf_hue.c
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@ -100,23 +100,32 @@ static inline void compute_sin_and_cos(HueContext *hue)
hue->hue_cos = rint(cos(hue->hue) * (1 << 16) * hue->saturation);
}
static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
static int set_expr(AVExpr **pexpr_ptr, char **expr_ptr,
const char *expr, const char *option, void *log_ctx)
{
int ret;
AVExpr *old = NULL;
AVExpr *new_pexpr;
char *new_expr;
if (*pexpr)
old = *pexpr;
ret = av_expr_parse(pexpr, expr, var_names,
new_expr = av_strdup(expr);
if (!new_expr)
return AVERROR(ENOMEM);
ret = av_expr_parse(&new_pexpr, expr, var_names,
NULL, NULL, NULL, NULL, 0, log_ctx);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s' for %s\n",
expr, option);
*pexpr = old;
av_free(new_expr);
return ret;
}
av_expr_free(old);
if (*pexpr_ptr)
av_expr_free(*pexpr_ptr);
*pexpr_ptr = new_pexpr;
av_freep(expr_ptr);
*expr_ptr = new_expr;
return 0;
}
@ -134,13 +143,15 @@ static av_cold int init(AVFilterContext *ctx)
#define SET_EXPR(expr, option) \
if (hue->expr##_expr) do { \
ret = set_expr(&hue->expr##_pexpr, hue->expr##_expr, option, ctx); \
ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
hue->expr##_expr, option, ctx); \
if (ret < 0) \
return ret; \
} while (0)
SET_EXPR(saturation, "s");
SET_EXPR(hue_deg, "h");
SET_EXPR(hue, "H");
#undef SET_EXPR
av_log(ctx, AV_LOG_VERBOSE,
"H_expr:%s h_deg_expr:%s s_expr:%s\n",
@ -306,16 +317,28 @@ static int process_command(AVFilterContext *ctx, const char *cmd, const char *ar
char *res, int res_len, int flags)
{
HueContext *hue = ctx->priv;
int ret;
#define SET_CMD(expr, option) do { \
if (!strcmp(cmd, option)) \
return set_expr(&hue->expr##_pexpr, args, cmd, ctx); \
} while (0)
SET_CMD(hue_deg, "h");
SET_CMD(hue, "H");
SET_CMD(saturation, "s");
#define SET_EXPR(expr, option) \
do { \
ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
args, option, ctx); \
if (ret < 0) \
return ret; \
} while (0)
return AVERROR(ENOSYS);
if (!strcmp(cmd, "h")) {
SET_EXPR(hue_deg, "h");
av_freep(&hue->hue_expr);
} else if (!strcmp(cmd, "H")) {
SET_EXPR(hue, "H");
av_freep(&hue->hue_deg_expr);
} else if (!strcmp(cmd, "s")) {
SET_EXPR(saturation, "s");
} else
return AVERROR(ENOSYS);
return 0;
}
static const AVFilterPad hue_inputs[] = {