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-rw-r--r--libavfilter/vf_fade.c177
1 files changed, 131 insertions, 46 deletions
diff --git a/libavfilter/vf_fade.c b/libavfilter/vf_fade.c
index f609db1248..df222747be 100644
--- a/libavfilter/vf_fade.c
+++ b/libavfilter/vf_fade.c
@@ -2,20 +2,20 @@
* Copyright (c) 2010 Brandon Mintern
* Copyright (c) 2007 Bobby Bingham
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -25,52 +25,94 @@
* based heavily on vf_negate.c by Bobby Bingham
*/
+#include "libavutil/avstring.h"
#include "libavutil/common.h"
+#include "libavutil/eval.h"
+#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
+#include "drawutils.h"
+#include "internal.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
+#define R 0
+#define G 1
+#define B 2
+#define A 3
+
+#define Y 0
+#define U 1
+#define V 2
+
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;
+ uint8_t is_packed_rgb;
+ uint8_t rgba_map[4];
+ int alpha;
+
+ char *type;
} FadeContext;
+#define OFFSET(x) offsetof(FadeContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption fade_options[] = {
+ { "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "start_frame", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, FLAGS },
+ { "s", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, FLAGS },
+ { "nb_frames", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.i64 = 25 }, 0, INT_MAX, FLAGS },
+ { "n", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.i64 = 25 }, 0, INT_MAX, FLAGS },
+ { "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS },
+ {NULL},
+};
+
+AVFILTER_DEFINE_CLASS(fade);
+
static av_cold int init(AVFilterContext *ctx, const char *args)
{
FadeContext *fade = ctx->priv;
- unsigned int nb_frames;
- char in_out[4];
+ static const char *shorthand[] = { "type", "start_frame", "nb_frames", NULL };
+ int ret;
- 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 ((ret = av_opt_set_from_string(fade, args, shorthand, "=", ":")) < 0)
+ return ret;
- nb_frames = nb_frames ? nb_frames : 1;
- fade->fade_per_frame = (1 << 16) / nb_frames;
- if (!strcmp(in_out, "in"))
+ 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);
+ "Type argument must be 'in' or 'out' but '%s' was specified\n", fade->type);
return AVERROR(EINVAL);
}
- fade->stop_frame = fade->start_frame + nb_frames;
+ fade->stop_frame = fade->start_frame + fade->nb_frames;
av_log(ctx, AV_LOG_VERBOSE,
- "type:%s start_frame:%d nb_frames:%d\n",
- in_out, fade->start_frame, nb_frames);
+ "type:%s start_frame:%d nb_frames:%d alpha:%d\n",
+ fade->type, fade->start_frame, fade->nb_frames, fade->alpha);
return 0;
}
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ FadeContext *fade = ctx->priv;
+
+ av_opt_free(fade);
+}
+
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
@@ -78,7 +120,10 @@ static int query_formats(AVFilterContext *ctx)
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
+ AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
+ AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
+ AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_NONE
};
@@ -86,6 +131,13 @@ static int query_formats(AVFilterContext *ctx)
return 0;
}
+const static enum AVPixelFormat studio_level_pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+ AV_PIX_FMT_YUV440P,
+ AV_PIX_FMT_NONE
+};
+
static int config_props(AVFilterLink *inlink)
{
FadeContext *fade = inlink->dst->priv;
@@ -95,9 +147,37 @@ static int config_props(AVFilterLink *inlink)
fade->vsub = pixdesc->log2_chroma_h;
fade->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
+ fade->alpha &= pixdesc->flags & PIX_FMT_ALPHA;
+ fade->is_packed_rgb = ff_fill_rgba_map(fade->rgba_map, inlink->format) >= 0;
+
+ /* use CCIR601/709 black level for studio-level pixel non-alpha components */
+ fade->black_level =
+ ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !fade->alpha ? 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;
}
+static void fade_plane(int y, int h, int w,
+ int fade_factor, int black_level, int black_level_scaled,
+ uint8_t offset, uint8_t step, int bytes_per_plane,
+ uint8_t *data, int line_size)
+{
+ uint8_t *p;
+ int i, j;
+
+ /* luma, alpha or rgb plane */
+ for (i = 0; i < h; i++) {
+ p = data + offset + (y+i) * line_size;
+ for (j = 0; j < w * bytes_per_plane; j++) {
+ /* fade->factor is using 16 lower-order bits for decimal places. */
+ *p = ((*p - black_level) * fade_factor + black_level_scaled) >> 16;
+ p+=step;
+ }
+ }
+}
+
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
{
FadeContext *fade = inlink->dst->priv;
@@ -105,29 +185,33 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
int i, j, plane;
if (fade->factor < UINT16_MAX) {
- /* luma or rgb plane */
- for (i = 0; i < frame->video->h; i++) {
- p = frame->data[0] + i * frame->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;
- p++;
- }
- }
-
- if (frame->data[1] && frame->data[2]) {
- /* chroma planes */
- for (plane = 1; plane < 3; plane++) {
- for (i = 0; i < frame->video->h; i++) {
- p = frame->data[plane] + (i >> fade->vsub) * frame->linesize[plane];
- for (j = 0; j < inlink->w >> fade->hsub; j++) {
- /* 8421367 = ((128 << 1) + 1) << 15. It is an integer
- * representation of 128.5. The .5 is for rounding
- * purposes. */
- *p = ((*p - 128) * fade->factor + 8421367) >> 16;
- p++;
+ if (fade->alpha) {
+ // alpha only
+ plane = fade->is_packed_rgb ? 0 : A; // alpha is on plane 0 for packed formats
+ // or plane 3 for planar formats
+ fade_plane(0, frame->video->h, inlink->w,
+ fade->factor, fade->black_level, fade->black_level_scaled,
+ fade->is_packed_rgb ? fade->rgba_map[A] : 0, // alpha offset for packed formats
+ fade->is_packed_rgb ? 4 : 1, // pixstep for 8 bit packed formats
+ 1, frame->data[plane], frame->linesize[plane]);
+ } else {
+ /* luma or rgb plane */
+ fade_plane(0, frame->video->h, inlink->w,
+ fade->factor, fade->black_level, fade->black_level_scaled,
+ 0, 1, // offset & pixstep for Y plane or RGB packed format
+ fade->bpp, frame->data[0], frame->linesize[0]);
+ if (frame->data[1] && frame->data[2]) {
+ /* chroma planes */
+ for (plane = 1; plane < 3; plane++) {
+ for (i = 0; i < frame->video->h; i++) {
+ p = frame->data[plane] + (i >> fade->vsub) * frame->linesize[plane];
+ for (j = 0; j < inlink->w >> fade->hsub; j++) {
+ /* 8421367 = ((128 << 1) + 1) << 15. It is an integer
+ * representation of 128.5. The .5 is for rounding
+ * purposes. */
+ *p = ((*p - 128) * fade->factor + 8421367) >> 16;
+ p++;
+ }
}
}
}
@@ -151,7 +235,6 @@ static const AVFilterPad avfilter_vf_fade_inputs[] = {
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
.min_perms = AV_PERM_READ | AV_PERM_WRITE,
- .rej_perms = AV_PERM_PRESERVE,
},
{ NULL }
};
@@ -166,11 +249,13 @@ static const AVFilterPad avfilter_vf_fade_outputs[] = {
AVFilter avfilter_vf_fade = {
.name = "fade",
- .description = NULL_IF_CONFIG_SMALL("Fade in/out input video"),
+ .description = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
.init = init,
+ .uninit = uninit,
.priv_size = sizeof(FadeContext),
.query_formats = query_formats,
.inputs = avfilter_vf_fade_inputs,
.outputs = avfilter_vf_fade_outputs,
+ .priv_class = &fade_class,
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 17:54:47 +0000