* based heavily on vf_negate.c by Bobby Bingham
*/
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
+#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
+#include "drawutils.h"
+#include "internal.h"
typedef struct {
+ const AVClass *class;
int factor, fade_per_frame;
- unsigned int frame_index, start_frame, stop_frame;
+ unsigned int frame_index, start_frame, stop_frame, nb_frames;
int hsub, vsub, bpp;
+ unsigned int black_level, black_level_scaled;
+
+ char *type;
} FadeContext;
+#define OFFSET(x) offsetof(FadeContext, x)
+
+static const AVOption fade_options[] = {
+ { "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX },
+ { "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX },
+ { "start_frame", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX },
+ { "s", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX },
+ { "nb_frames", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
+ { "n", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
+ {NULL},
+};
+
+static const char *fade_get_name(void *ctx)
+{
+ return "fade";
+}
+
+static const AVClass fade_class = {
+ "FadeContext",
+ fade_get_name,
+ fade_options
+};
+
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
FadeContext *fade = ctx->priv;
- unsigned int nb_frames;
- char in_out[4];
+ int ret = 0;
+ char *args1, *expr, *bufptr = NULL;
- if (!args ||
- sscanf(args, " %3[^:]:%u:%u", in_out, &fade->start_frame, &nb_frames) != 3) {
- av_log(ctx, AV_LOG_ERROR,
- "Expected 3 arguments '(in|out):#:#':'%s'\n", args);
- return AVERROR(EINVAL);
+ fade->class = &fade_class;
+ av_opt_set_defaults(fade);
+
+ if (!(args1 = av_strdup(args))) {
+ ret = AVERROR(ENOMEM);
+ goto end;
}
- nb_frames = nb_frames ? nb_frames : 1;
- fade->fade_per_frame = (1 << 16) / nb_frames;
- if (!strcmp(in_out, "in"))
+ if (expr = av_strtok(args1, ":", &bufptr)) {
+ if (!(fade->type = av_strdup(expr))) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ }
+ if (expr = av_strtok(NULL, ":", &bufptr)) {
+ if ((ret = av_opt_set(fade, "start_frame", expr, 0)) < 0) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid value '%s' for start_frame option\n", expr);
+ return ret;
+ }
+ }
+ if (expr = av_strtok(NULL, ":", &bufptr)) {
+ if ((ret = av_opt_set(fade, "nb_frames", expr, 0)) < 0) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid value '%s' for nb_frames option\n", expr);
+ return ret;
+ }
+ }
+
+ if (bufptr && (ret = av_set_options_string(fade, bufptr, "=", ":")) < 0)
+ goto end;
+
+ fade->fade_per_frame = (1 << 16) / fade->nb_frames;
+ if (!strcmp(fade->type, "in"))
fade->factor = 0;
- else if (!strcmp(in_out, "out")) {
+ else if (!strcmp(fade->type, "out")) {
fade->fade_per_frame = -fade->fade_per_frame;
fade->factor = (1 << 16);
} else {
av_log(ctx, AV_LOG_ERROR,
- "first argument must be 'in' or 'out':'%s'\n", in_out);
- return AVERROR(EINVAL);
+ "Type argument must be 'in' or 'out' but '%s' was specified\n", fade->type);
+ ret = AVERROR(EINVAL);
+ goto end;
}
- fade->stop_frame = fade->start_frame + nb_frames;
+ fade->stop_frame = fade->start_frame + fade->nb_frames;
av_log(ctx, AV_LOG_INFO,
"type:%s start_frame:%d nb_frames:%d\n",
- in_out, fade->start_frame, nb_frames);
- return 0;
+ fade->type, fade->start_frame, fade->nb_frames);
+
+end:
+ av_free(args1);
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ FadeContext *fade = ctx->priv;
+
+ av_freep(&fade->type);
}
static int query_formats(AVFilterContext *ctx)
return 0;
}
+const static enum PixelFormat studio_level_pix_fmts[] = {
+ PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
+ PIX_FMT_YUV411P, PIX_FMT_YUV410P,
+ PIX_FMT_YUV440P,
+ PIX_FMT_NONE
+};
+
static int config_props(AVFilterLink *inlink)
{
FadeContext *fade = inlink->dst->priv;
fade->vsub = pixdesc->log2_chroma_h;
fade->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
+
+ fade->black_level = ff_fmt_is_in(inlink->format, studio_level_pix_fmts) ? 16 : 0;
+ /* 32768 = 1 << 15, it is an integer representation
+ * of 0.5 and is for rounding. */
+ fade->black_level_scaled = (fade->black_level << 16) + 32768;
return 0;
}
for (i = 0; i < h; i++) {
p = outpic->data[0] + (y+i) * outpic->linesize[0];
for (j = 0; j < inlink->w * fade->bpp; j++) {
- /* fade->factor is using 16 lower-order bits for decimal
- * places. 32768 = 1 << 15, it is an integer representation
- * of 0.5 and is for rounding. */
- *p = (*p * fade->factor + 32768) >> 16;
+ /* fade->factor is using 16 lower-order bits for decimal places. */
+ *p = ((*p - fade->black_level) * fade->factor + fade->black_level_scaled) >> 16;
p++;
}
}
.name = "fade",
.description = NULL_IF_CONFIG_SMALL("Fade in/out input video"),
.init = init,
+ .uninit = uninit,
.priv_size = sizeof(FadeContext),
.query_formats = query_formats,
- .inputs = (AVFilterPad[]) {{ .name = "default",
+ .inputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.get_video_buffer = avfilter_null_get_video_buffer,
.min_perms = AV_PERM_READ | AV_PERM_WRITE,
.rej_perms = AV_PERM_PRESERVE, },
{ .name = NULL}},
- .outputs = (AVFilterPad[]) {{ .name = "default",
+ .outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};
projects / ffmpeg / blobdiff