*/
#include "avfilter.h"
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avassert.h"
#include "libswscale/swscale.h"
+static const char *var_names[] = {
+ "PI",
+ "PHI",
+ "E",
+ "in_w", "iw",
+ "in_h", "ih",
+ "out_w", "ow",
+ "out_h", "oh",
+ "a",
+ "hsub",
+ "vsub",
+ NULL
+};
+
+enum var_name {
+ VAR_PI,
+ VAR_PHI,
+ VAR_E,
+ VAR_IN_W, VAR_IW,
+ VAR_IN_H, VAR_IH,
+ VAR_OUT_W, VAR_OW,
+ VAR_OUT_H, VAR_OH,
+ VAR_A,
+ VAR_HSUB,
+ VAR_VSUB,
+ VARS_NB
+};
+
typedef struct {
struct SwsContext *sws; ///< software scaler context
struct SwsContext *isws[2]; ///< software scaler context for interlaced material
int slice_y; ///< top of current output slice
int input_is_pal; ///< set to 1 if the input format is paletted
int interlaced;
+
+ char w_expr[256]; ///< width expression string
+ char h_expr[256]; ///< height expression string
} ScaleContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
ScaleContext *scale = ctx->priv;
const char *p;
+ av_strlcpy(scale->w_expr, "iw", sizeof(scale->w_expr));
+ av_strlcpy(scale->h_expr, "ih", sizeof(scale->h_expr));
+
scale->flags = SWS_BILINEAR;
if (args) {
- sscanf(args, "%d:%d", &scale->w, &scale->h);
+ sscanf(args, "%255[^:]:%255[^:]", scale->w_expr, scale->h_expr);
p = strstr(args,"flags=");
if (p) scale->flags = strtoul(p+6, NULL, 0);
if(strstr(args,"interl=1")){
scale->interlaced=-1;
}
- /* sanity check params */
- if (scale->w < -1 || scale->h < -1) {
- av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
- return AVERROR(EINVAL);
- }
- if (scale->w == -1 && scale->h == -1)
- scale->w = scale->h = 0;
-
return 0;
}
AVFilterLink *inlink = outlink->src->inputs[0];
ScaleContext *scale = ctx->priv;
int64_t w, h;
+ double var_values[VARS_NB], res;
+ char *expr;
+ int ret;
+
+ var_values[VAR_PI] = M_PI;
+ var_values[VAR_PHI] = M_PHI;
+ var_values[VAR_E] = M_E;
+ var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
+ var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
+ var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
+ var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
+ var_values[VAR_A] = (float) inlink->w / inlink->h;
+ var_values[VAR_HSUB] = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
+ var_values[VAR_VSUB] = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
+
+ /* evaluate width and height */
+ av_expr_parse_and_eval(&res, (expr = scale->w_expr),
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx);
+ scale->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
+ if ((ret = av_expr_parse_and_eval(&res, (expr = scale->h_expr),
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+ scale->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
+ /* evaluate again the width, as it may depend on the output height */
+ if ((ret = av_expr_parse_and_eval(&res, (expr = scale->w_expr),
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+ scale->w = res;
+
+ w = scale->w;
+ h = scale->h;
+
+ /* sanity check params */
+ if (w < -1 || h < -1) {
+ av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
+ return AVERROR(EINVAL);
+ }
+ if (w == -1 && h == -1)
+ scale->w = scale->h = 0;
if (!(w = scale->w))
w = inlink->w;
scale->input_is_pal = av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL;
+ if (scale->sws)
+ sws_freeContext(scale->sws);
scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
outlink->w, outlink->h, outlink->format,
scale->flags, NULL, NULL, NULL);
+ if (scale->isws[0])
+ sws_freeContext(scale->isws[0]);
scale->isws[0] = sws_getContext(inlink ->w, inlink ->h/2, inlink ->format,
outlink->w, outlink->h/2, outlink->format,
scale->flags, NULL, NULL, NULL);
+ if (scale->isws[1])
+ sws_freeContext(scale->isws[1]);
scale->isws[1] = sws_getContext(inlink ->w, inlink ->h/2, inlink ->format,
outlink->w, outlink->h/2, outlink->format,
scale->flags, NULL, NULL, NULL);
return AVERROR(EINVAL);
return 0;
+
+fail:
+ av_log(NULL, AV_LOG_ERROR,
+ "Error when evaluating the expression '%s'\n", expr);
+ return ret;
}
static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
outlink->out_buf = outpicref;
- av_reduce(&outpicref->video->pixel_aspect.num, &outpicref->video->pixel_aspect.den,
- (int64_t)picref->video->pixel_aspect.num * outlink->h * link->w,
- (int64_t)picref->video->pixel_aspect.den * outlink->w * link->h,
+ av_reduce(&outpicref->video->sample_aspect_ratio.num, &outpicref->video->sample_aspect_ratio.den,
+ (int64_t)picref->video->sample_aspect_ratio.num * outlink->h * link->w,
+ (int64_t)picref->video->sample_aspect_ratio.den * outlink->w * link->h,
INT_MAX);
scale->slice_y = 0;
ScaleContext *scale = link->dst->priv;
AVFilterBufferRef *cur_pic = link->cur_buf;
AVFilterBufferRef *out_buf = link->dst->outputs[0]->out_buf;
- const uint8_t *in[4], *out[4];
+ const uint8_t *in[4];
+ uint8_t *out[4];
int in_stride[4],out_stride[4];
int i;
projects / ffmpeg / blobdiff