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vf_overlay: enable RGB path

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Add option rgb which forces the RGB path.
This commit is contained in:
Stefano Sabatini
2011-10-29 00:10:43 +02:00
parent c0dbab964d
commit 3013bfa81e
2 changed files with 116 additions and 20 deletions
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121
libavfilter/vf_overlay.c
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@@ -33,6 +33,7 @@
#include "libavutil/imgutils.h"
#include "libavutil/mathematics.h"
#include "internal.h"
#include "drawutils.h"
static const char *var_names[] = {
"main_w", "W", ///< width of the main video
@@ -53,13 +54,31 @@ enum var_name {
#define MAIN 0
#define OVERLAY 1
#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 x, y; ///< position of overlayed picture
int allow_packed_rgb;
uint8_t main_is_packed_rgb;
uint8_t main_rgba_map[4];
uint8_t main_has_alpha;
uint8_t overlay_is_packed_rgb;
uint8_t overlay_rgba_map[4];
uint8_t overlay_has_alpha;
AVFilterBufferRef *overpicref;
int max_plane_step[4]; ///< steps per pixel for each plane
int main_pix_step[4]; ///< steps per pixel for each plane of the main output
int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
int hsub, vsub; ///< chroma subsampling values
char *x_expr, *y_expr;
@@ -70,6 +89,7 @@ typedef struct {
static const AVOption overlay_options[] = {
{ "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX },
{ "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX },
{"rgb", "force packed RGB in input and output", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
{NULL},
};
@@ -128,27 +148,59 @@ static av_cold void uninit(AVFilterContext *ctx)
static int query_formats(AVFilterContext *ctx)
{
const enum PixelFormat inout_pix_fmts[] = { PIX_FMT_YUV420P, PIX_FMT_NONE };
const enum PixelFormat blend_pix_fmts[] = { PIX_FMT_YUVA420P, PIX_FMT_NONE };
AVFilterFormats *inout_formats = avfilter_make_format_list(inout_pix_fmts);
AVFilterFormats *blend_formats = avfilter_make_format_list(blend_pix_fmts);
OverlayContext *over = ctx->priv;
avfilter_formats_ref(inout_formats, &ctx->inputs [MAIN ]->out_formats);
avfilter_formats_ref(blend_formats, &ctx->inputs [OVERLAY]->out_formats);
avfilter_formats_ref(inout_formats, &ctx->outputs[MAIN ]->in_formats );
/* overlay formats contains alpha, for avoiding conversion with alpha information loss */
const enum PixelFormat main_pix_fmts_yuv[] = { PIX_FMT_YUV420P, PIX_FMT_NONE };
const enum PixelFormat overlay_pix_fmts_yuv[] = { PIX_FMT_YUVA420P, PIX_FMT_NONE };
const enum PixelFormat main_pix_fmts_rgb[] = {
PIX_FMT_ARGB, PIX_FMT_RGBA,
PIX_FMT_ABGR, PIX_FMT_BGRA,
PIX_FMT_RGB24, PIX_FMT_BGR24,
PIX_FMT_NONE
};
const enum PixelFormat overlay_pix_fmts_rgb[] = {
PIX_FMT_ARGB, PIX_FMT_RGBA,
PIX_FMT_ABGR, PIX_FMT_BGRA,
PIX_FMT_NONE
};
AVFilterFormats *main_formats;
AVFilterFormats *overlay_formats;
if (over->allow_packed_rgb) {
main_formats = avfilter_make_format_list(main_pix_fmts_rgb);
overlay_formats = avfilter_make_format_list(overlay_pix_fmts_rgb);
} else {
main_formats = avfilter_make_format_list(main_pix_fmts_yuv);
overlay_formats = avfilter_make_format_list(overlay_pix_fmts_yuv);
}
avfilter_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats);
avfilter_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
avfilter_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats );
return 0;
}
static enum PixelFormat alpha_pix_fmts[] = {
PIX_FMT_YUVA420P, PIX_FMT_ARGB, PIX_FMT_ABGR, PIX_FMT_RGBA,
PIX_FMT_BGRA, PIX_FMT_NONE
};
static int config_input_main(AVFilterLink *inlink)
{
OverlayContext *over = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
av_image_fill_max_pixsteps(over->max_plane_step, NULL, pix_desc);
av_image_fill_max_pixsteps(over->main_pix_step, NULL, pix_desc);
over->hsub = pix_desc->log2_chroma_w;
over->vsub = pix_desc->log2_chroma_h;
over->main_is_packed_rgb =
ff_fill_rgba_map(over->main_rgba_map, inlink->format) >= 0;
over->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
return 0;
}
@@ -159,6 +211,9 @@ static int config_input_overlay(AVFilterLink *inlink)
char *expr;
double var_values[VAR_VARS_NB], res;
int ret;
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
av_image_fill_max_pixsteps(over->overlay_pix_step, NULL, pix_desc);
/* Finish the configuration by evaluating the expressions
now when both inputs are configured. */
@@ -181,6 +236,10 @@ static int config_input_overlay(AVFilterLink *inlink)
goto fail;
over->x = res;
over->overlay_is_packed_rgb =
ff_fill_rgba_map(over->overlay_rgba_map, inlink->format) >= 0;
over->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
av_log(ctx, AV_LOG_INFO,
"main w:%d h:%d fmt:%s overlay x:%d y:%d w:%d h:%d fmt:%s\n",
ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
@@ -272,6 +331,10 @@ static void start_frame_overlay(AVFilterLink *inlink, AVFilterBufferRef *inpicre
ctx->outputs[0]->time_base);
}
// divide by 255 and round to nearest
// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
static void blend_slice(AVFilterContext *ctx,
AVFilterBufferRef *dst, AVFilterBufferRef *src,
int x, int y, int w, int h,
@@ -289,21 +352,43 @@ static void blend_slice(AVFilterContext *ctx,
start_y = FFMAX(y, slice_y);
height = end_y - start_y;
if (dst->format == PIX_FMT_BGR24 || dst->format == PIX_FMT_RGB24) {
uint8_t *dp = dst->data[0] + x * 3 + start_y * dst->linesize[0];
if (over->main_is_packed_rgb) {
uint8_t *dp = dst->data[0] + x * over->main_pix_step[0] +
start_y * dst->linesize[0];
uint8_t *sp = src->data[0];
int b = dst->format == PIX_FMT_BGR24 ? 2 : 0;
int r = dst->format == PIX_FMT_BGR24 ? 0 : 2;
uint8_t alpha; ///< the amount of overlay to blend on to main
const int dr = over->main_rgba_map[R];
const int dg = over->main_rgba_map[G];
const int db = over->main_rgba_map[B];
const int dstep = over->main_pix_step[0];
const int sr = over->overlay_rgba_map[R];
const int sg = over->overlay_rgba_map[G];
const int sb = over->overlay_rgba_map[B];
const int sa = over->overlay_rgba_map[A];
const int sstep = over->overlay_pix_step[0];
if (slice_y > y)
sp += (slice_y - y) * src->linesize[0];
for (i = 0; i < height; i++) {
uint8_t *d = dp, *s = sp;
for (j = 0; j < width; j++) {
d[r] = (d[r] * (0xff - s[3]) + s[0] * s[3] + 128) >> 8;
d[1] = (d[1] * (0xff - s[3]) + s[1] * s[3] + 128) >> 8;
d[b] = (d[b] * (0xff - s[3]) + s[2] * s[3] + 128) >> 8;
d += 3;
s += 4;
alpha = s[sa];
switch (alpha) {
case 0:
break;
case 255:
d[dr] = s[sr];
d[dg] = s[sg];
d[db] = s[sb];
break;
default:
// main_value = main_value * (1 - alpha) + overlay_value * alpha
// since alpha is in the range 0-255, the result must divided by 255
d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha);
d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha);
d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha);
}
d += dstep;
s += sstep;
}
dp += dst->linesize[0];
sp += src->linesize[0];