#include "avfilter.h"
#include "formats.h"
#include "internal.h"
+#include "scale.h"
#include "video.h"
#include "libavutil/avstring.h"
-#include "libavutil/eval.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libswscale/swscale.h"
-static const char *const var_names[] = {
- "in_w", "iw",
- "in_h", "ih",
- "out_w", "ow",
- "out_h", "oh",
- "a",
- "sar",
- "dar",
- "hsub",
- "vsub",
- "ohsub",
- "ovsub",
- NULL
-};
-
-enum var_name {
- VAR_IN_W, VAR_IW,
- VAR_IN_H, VAR_IH,
- VAR_OUT_W, VAR_OW,
- VAR_OUT_H, VAR_OH,
- VAR_A,
- VAR_SAR,
- VAR_DAR,
- VAR_HSUB,
- VAR_VSUB,
- VAR_OHSUB,
- VAR_OVSUB,
- VARS_NB
-};
-
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
-
typedef struct ScaleContext {
const AVClass *class;
struct SwsContext *sws; ///< software scaler context
outlink->src->inputs[1] :
outlink->src->inputs[0];
enum AVPixelFormat outfmt = outlink->format;
- ScaleContext *scale = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
- const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format);
- int64_t w, h;
- double var_values[VARS_NB], res;
- char *expr;
+ ScaleContext *scale = ctx->priv;
+ int w, h;
int ret;
- int factor_w, factor_h;
-
- 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] = (double) inlink->w / inlink->h;
- var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
- (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
- var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
- var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
- var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
- var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;
- var_values[VAR_OVSUB] = 1 << out_desc->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;
-
- /* Check if it is requested that the result has to be divisible by a some
- * factor (w or h = -n with n being the factor). */
- factor_w = 1;
- factor_h = 1;
- if (w < -1) {
- factor_w = -w;
- }
- if (h < -1) {
- factor_h = -h;
- }
-
- if (w < 0 && h < 0)
- scale->w = scale->h = 0;
- if (!(w = scale->w))
- w = inlink->w;
- if (!(h = scale->h))
- h = inlink->h;
-
- /* Make sure that the result is divisible by the factor we determined
- * earlier. If no factor was set, it is nothing will happen as the default
- * factor is 1 */
- if (w < 0)
- w = av_rescale(h, inlink->w, inlink->h * factor_w) * factor_w;
- if (h < 0)
- h = av_rescale(w, inlink->h, inlink->w * factor_h) * factor_h;
+ if ((ret = ff_scale_eval_dimensions(ctx,
+ scale->w_expr, scale->h_expr,
+ inlink, outlink,
+ &w, &h)) < 0)
+ goto fail;
/* Note that force_original_aspect_ratio may overwrite the previous set
* dimensions so that it is not divisible by the set factors anymore. */
int i;
for (i = 0; i < 3; i++) {
+ int in_v_chr_pos = scale->in_v_chr_pos, out_v_chr_pos = scale->out_v_chr_pos;
struct SwsContext **s = swscs[i];
*s = sws_alloc_context();
if (!*s)
* MPEG-2 chroma positions are used by convention
* XXX: support other 4:2:0 pixel formats */
if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) {
- scale->in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
+ in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}
if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) {
- scale->out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
+ out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}
av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
- av_opt_set_int(*s, "src_v_chr_pos", scale->in_v_chr_pos, 0);
+ av_opt_set_int(*s, "src_v_chr_pos", in_v_chr_pos, 0);
av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
- av_opt_set_int(*s, "dst_v_chr_pos", scale->out_v_chr_pos, 0);
+ av_opt_set_int(*s, "dst_v_chr_pos", out_v_chr_pos, 0);
if ((ret = sws_init_context(*s, NULL, NULL)) < 0)
return ret;
return 0;
fail:
- av_log(NULL, AV_LOG_ERROR,
- "Error when evaluating the expression '%s'.\n"
- "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
- expr, scale->w_expr, scale->h_expr);
return ret;
}
projects / ffmpeg / blobdiff