/*
* Copyright (c) 2010 Bobby Bingham
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* aspect ratio modification video filters
*/
+#include <float.h>
+
+#include "libavutil/common.h"
+#include "libavutil/eval.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+
#include "avfilter.h"
+#include "internal.h"
+#include "video.h"
+
+static const char *const var_names[] = {
+ "PI",
+ "PHI",
+ "E",
+ "w",
+ "h",
+ "a", "dar",
+ "sar",
+ "hsub",
+ "vsub",
+ NULL
+};
+
+enum var_name {
+ VAR_PI,
+ VAR_PHI,
+ VAR_E,
+ VAR_W,
+ VAR_H,
+ VAR_A, VAR_DAR,
+ VAR_SAR,
+ VAR_HSUB,
+ VAR_VSUB,
+ VARS_NB
+};
-typedef struct {
- AVRational aspect;
+typedef struct AspectContext {
+ const AVClass *class;
+ AVRational dar;
+ AVRational sar;
+#if FF_API_OLD_FILTER_OPTS
+ float aspect_num, aspect_den;
+#endif
+ char *ratio_expr;
} AspectContext;
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+#if FF_API_OLD_FILTER_OPTS
+static av_cold int init(AVFilterContext *ctx)
{
- AspectContext *aspect = ctx->priv;
- double ratio;
- int64_t gcd;
-
- if (args) {
- if (sscanf(args, "%d:%d", &aspect->aspect.num, &aspect->aspect.den) < 2) {
- if (sscanf(args, "%lf", &ratio) < 1) {
- av_log(ctx, AV_LOG_ERROR,
- "Invalid string '%s' for aspect ratio.\n", args);
- return AVERROR(EINVAL);
- }
- aspect->aspect = av_d2q(ratio, 100);
- } else {
- gcd = av_gcd(FFABS(aspect->aspect.num), FFABS(aspect->aspect.den));
- if (gcd) {
- aspect->aspect.num /= gcd;
- aspect->aspect.den /= gcd;
- }
- }
- }
+ AspectContext *s = ctx->priv;
- if (aspect->aspect.den == 0)
- aspect->aspect = (AVRational) {0, 1};
+ if (s->aspect_num > 0 && s->aspect_den > 0) {
+ av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use "
+ "dar=<number> or dar=num/den.\n");
+ s->sar = s->dar = av_d2q(s->aspect_num / s->aspect_den, INT_MAX);
+ }
- av_log(ctx, AV_LOG_INFO, "a:%d/%d\n", aspect->aspect.num, aspect->aspect.den);
return 0;
}
+#endif
+
+static int filter_frame(AVFilterLink *link, AVFrame *frame)
+{
+ AspectContext *s = link->dst->priv;
+
+ frame->sample_aspect_ratio = s->sar;
+ return ff_filter_frame(link->dst->outputs[0], frame);
+}
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+#define OFFSET(x) offsetof(AspectContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
+
+static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
{
- AspectContext *aspect = link->dst->priv;
+ AVFilterContext *ctx = inlink->dst;
+ AspectContext *s = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ double var_values[VARS_NB], res;
+ int ret;
+
+ var_values[VAR_PI] = M_PI;
+ var_values[VAR_PHI] = M_PHI;
+ var_values[VAR_E] = M_E;
+ var_values[VAR_W] = inlink->w;
+ var_values[VAR_H] = inlink->h;
+ 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;
- picref->video->pixel_aspect = aspect->aspect;
- avfilter_start_frame(link->dst->outputs[0], picref);
+ /* evaluate new aspect ratio*/
+ if ((ret = av_expr_parse_and_eval(&res, s->ratio_expr,
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
+ av_log(NULL, AV_LOG_ERROR,
+ "Error when evaluating the expression '%s'\n", s->ratio_expr);
+ return ret;
+ }
+ *aspect_ratio = av_d2q(res, INT_MAX);
+ return 0;
}
#if CONFIG_SETDAR_FILTER
/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
static int setdar_config_props(AVFilterLink *inlink)
{
- AspectContext *aspect = inlink->dst->priv;
- AVRational dar = aspect->aspect;
+ AspectContext *s = inlink->dst->priv;
+ AVRational dar;
+ int ret;
+
+#if FF_API_OLD_FILTER_OPTS
+ if (!(s->aspect_num > 0 && s->aspect_den > 0)) {
+#endif
+ if ((ret = get_aspect_ratio(inlink, &s->dar)))
+ return ret;
+#if FF_API_OLD_FILTER_OPTS
+ }
+#endif
- av_reduce(&aspect->aspect.num, &aspect->aspect.den,
- aspect->aspect.num * inlink->h,
- aspect->aspect.den * inlink->w, 100);
+ if (s->dar.num && s->dar.den) {
+ av_reduce(&s->sar.num, &s->sar.den,
+ s->dar.num * inlink->h,
+ s->dar.den * inlink->w, 100);
+ inlink->sample_aspect_ratio = s->sar;
+ dar = s->dar;
+ } else {
+ inlink->sample_aspect_ratio = (AVRational){ 1, 1 };
+ dar = (AVRational){ inlink->w, inlink->h };
+ }
+
+ av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n",
+ inlink->w, inlink->h, dar.num, dar.den,
+ inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den);
- av_log(inlink->dst, AV_LOG_INFO, "w:%d h:%d -> dar:%d/%d par:%d/%d\n",
- inlink->h, inlink->w, dar.num, dar.den, aspect->aspect.num, aspect->aspect.den);
return 0;
}
-AVFilter avfilter_vf_setdar = {
+static const AVOption setdar_options[] = {
+#if FF_API_OLD_FILTER_OPTS
+ { "dar_num", NULL, OFFSET(aspect_num), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
+ { "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
+#endif
+ { "dar", "display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
+ { NULL },
+};
+
+static const AVClass setdar_class = {
+ .class_name = "setdar",
+ .item_name = av_default_item_name,
+ .option = setdar_options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVFilterPad avfilter_vf_setdar_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = setdar_config_props,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad avfilter_vf_setdar_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_setdar = {
.name = "setdar",
.description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
+#if FF_API_OLD_FILTER_OPTS
.init = init,
+#endif
.priv_size = sizeof(AspectContext),
+ .priv_class = &setdar_class,
+
+ .inputs = avfilter_vf_setdar_inputs,
- .inputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .config_props = setdar_config_props,
- .get_video_buffer = avfilter_null_get_video_buffer,
- .start_frame = start_frame,
- .end_frame = avfilter_null_end_frame },
- { .name = NULL}},
-
- .outputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO, },
- { .name = NULL}},
+ .outputs = avfilter_vf_setdar_outputs,
};
#endif /* CONFIG_SETDAR_FILTER */
#if CONFIG_SETSAR_FILTER
-AVFilter avfilter_vf_setsar = {
+/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
+static int setsar_config_props(AVFilterLink *inlink)
+{
+ AspectContext *s = inlink->dst->priv;
+ int ret;
+
+#if FF_API_OLD_FILTER_OPTS
+ if (!(s->aspect_num > 0 && s->aspect_den > 0)) {
+#endif
+ if ((ret = get_aspect_ratio(inlink, &s->sar)))
+ return ret;
+#if FF_API_OLD_FILTER_OPTS
+ }
+#endif
+
+ inlink->sample_aspect_ratio = s->sar;
+
+ return 0;
+}
+
+static const AVOption setsar_options[] = {
+#if FF_API_OLD_FILTER_OPTS
+ { "sar_num", NULL, OFFSET(aspect_num), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
+ { "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
+#endif
+ { "sar", "sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
+ { NULL },
+};
+
+static const AVClass setsar_class = {
+ .class_name = "setsar",
+ .item_name = av_default_item_name,
+ .option = setsar_options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVFilterPad avfilter_vf_setsar_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = setsar_config_props,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad avfilter_vf_setsar_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_setsar = {
.name = "setsar",
.description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
+#if FF_API_OLD_FILTER_OPTS
.init = init,
+#endif
.priv_size = sizeof(AspectContext),
+ .priv_class = &setsar_class,
- .inputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .get_video_buffer = avfilter_null_get_video_buffer,
- .start_frame = start_frame,
- .end_frame = avfilter_null_end_frame },
- { .name = NULL}},
+ .inputs = avfilter_vf_setsar_inputs,
- .outputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO, },
- { .name = NULL}},
+ .outputs = avfilter_vf_setsar_outputs,
};
#endif /* CONFIG_SETSAR_FILTER */
-
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