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vf_fade: add alpha option and alpha fading support
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
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@ -1166,6 +1166,9 @@ See @var{start_frame}.
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@item nb_frames, n
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See @var{nb_frames}.
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@item alpha
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If set to 1, fade only alpha channel, if one exists on the input.
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Default value is 0.
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@end table
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A few usage examples follow, usable too as test scenarios.
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@ -1181,6 +1184,9 @@ fade=in:0:25, fade=out:975:25
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# make first 5 frames black, then fade in from frame 5-24
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fade=in:5:20
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# fade in alpha over first 25 frames of video
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fade=in:0:25:alpha=1
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@end example
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@section fieldorder
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@ -30,7 +30,7 @@
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#define LIBAVFILTER_VERSION_MAJOR 2
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#define LIBAVFILTER_VERSION_MINOR 47
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#define LIBAVFILTER_VERSION_MICRO 1
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#define LIBAVFILTER_VERSION_MICRO 2
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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@ -33,12 +33,24 @@
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#include "drawutils.h"
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#include "internal.h"
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#define R 0
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#define G 1
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#define B 2
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#define A 3
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#define Y 0
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#define U 1
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#define V 2
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typedef struct {
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const AVClass *class;
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int factor, fade_per_frame;
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unsigned int frame_index, start_frame, stop_frame, nb_frames;
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int hsub, vsub, bpp;
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unsigned int black_level, black_level_scaled;
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uint8_t is_packed_rgb;
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uint8_t rgba_map[4];
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int alpha;
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char *type;
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} FadeContext;
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@ -52,6 +64,7 @@ static const AVOption fade_options[] = {
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{ "s", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX },
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{ "nb_frames", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
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{ "n", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
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{ "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, 1 },
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{NULL},
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};
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@ -119,8 +132,8 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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fade->stop_frame = fade->start_frame + fade->nb_frames;
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av_log(ctx, AV_LOG_INFO,
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"type:%s start_frame:%d nb_frames:%d\n",
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fade->type, fade->start_frame, fade->nb_frames);
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"type:%s start_frame:%d nb_frames:%d alpha:%d\n",
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fade->type, fade->start_frame, fade->nb_frames, fade->alpha);
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end:
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av_free(args1);
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@ -141,7 +154,10 @@ static int query_formats(AVFilterContext *ctx)
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PIX_FMT_YUV411P, PIX_FMT_YUV410P,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
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PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
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PIX_FMT_YUVA420P,
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PIX_FMT_RGB24, PIX_FMT_BGR24,
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PIX_FMT_ARGB, PIX_FMT_ABGR,
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PIX_FMT_RGBA, PIX_FMT_BGRA,
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PIX_FMT_NONE
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};
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@ -156,6 +172,13 @@ const static enum PixelFormat studio_level_pix_fmts[] = {
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PIX_FMT_NONE
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};
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static enum PixelFormat alpha_pix_fmts[] = {
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PIX_FMT_YUVA420P,
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PIX_FMT_ARGB, PIX_FMT_ABGR,
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PIX_FMT_RGBA, PIX_FMT_BGRA,
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PIX_FMT_NONE
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};
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static int config_props(AVFilterLink *inlink)
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{
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FadeContext *fade = inlink->dst->priv;
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@ -165,14 +188,37 @@ static int config_props(AVFilterLink *inlink)
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fade->vsub = pixdesc->log2_chroma_h;
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fade->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
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fade->alpha = fade->alpha ? ff_fmt_is_in(inlink->format, alpha_pix_fmts) : 0;
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fade->is_packed_rgb = ff_fill_rgba_map(fade->rgba_map, inlink->format) >= 0;
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fade->black_level = ff_fmt_is_in(inlink->format, studio_level_pix_fmts) ? 16 : 0;
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/* CCIR601/709 black level unless input is RGB or has alpha */
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fade->black_level =
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ff_fmt_is_in(inlink->format, studio_level_pix_fmts) || fade->alpha ? 0 : 16;
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/* 32768 = 1 << 15, it is an integer representation
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* of 0.5 and is for rounding. */
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fade->black_level_scaled = (fade->black_level << 16) + 32768;
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return 0;
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}
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static void fade_plane(int y, int h, int w,
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int fade_factor, int black_level, int black_level_scaled,
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uint8_t offset, uint8_t step, int bytes_per_plane,
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uint8_t *data, int line_size)
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{
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uint8_t *p;
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int i, j;
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/* luma, alpha or rgb plane */
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for (i = 0; i < h; i++) {
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p = data + offset + (y+i) * line_size;
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for (j = 0; j < w * bytes_per_plane; j++) {
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/* fade->factor is using 16 lower-order bits for decimal places. */
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*p = ((*p - black_level) * fade_factor + black_level_scaled) >> 16;
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p+=step;
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}
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}
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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FadeContext *fade = inlink->dst->priv;
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@ -181,16 +227,21 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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int i, j, plane;
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if (fade->factor < UINT16_MAX) {
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if (fade->alpha) {
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// alpha only
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plane = fade->is_packed_rgb ? 0 : A; // alpha is on plane 0 for packed formats
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// or plane 3 for planar formats
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fade_plane(y, h, inlink->w,
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fade->factor, fade->black_level, fade->black_level_scaled,
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fade->is_packed_rgb ? fade->rgba_map[A] : 0, // alpha offset for packed formats
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fade->is_packed_rgb ? 4 : 1, // pixstep for 8 bit packed formats
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1, outpic->data[plane], outpic->linesize[plane]);
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} else {
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/* luma or rgb plane */
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for (i = 0; i < h; i++) {
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p = outpic->data[0] + (y+i) * outpic->linesize[0];
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for (j = 0; j < inlink->w * fade->bpp; j++) {
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/* fade->factor is using 16 lower-order bits for decimal places. */
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*p = ((*p - fade->black_level) * fade->factor + fade->black_level_scaled) >> 16;
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p++;
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}
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}
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fade_plane(y, h, inlink->w,
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fade->factor, fade->black_level, fade->black_level_scaled,
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0, 1, // offset & pixstep for Y plane or RGB packed format
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fade->bpp, outpic->data[0], outpic->linesize[0]);
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if (outpic->data[1] && outpic->data[2]) {
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/* chroma planes */
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for (plane = 1; plane < 3; plane++) {
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@ -206,6 +257,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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}
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}
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}
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}
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}
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avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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