* Copyright (c) 2010 Baptiste Coudurier
* 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
*/
* overlay one video on top of another
*/
+/* #define DEBUG */
+
#include "avfilter.h"
#include "formats.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/avstring.h"
-#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
+#include "libavutil/timestamp.h"
#include "internal.h"
+#include "bufferqueue.h"
+#include "drawutils.h"
#include "video.h"
static const char *const var_names[] = {
- "E",
- "PHI",
- "PI",
"main_w", "W", ///< width of the main video
"main_h", "H", ///< height of the main video
"overlay_w", "w", ///< width of the overlay video
"overlay_h", "h", ///< height of the overlay video
+ "hsub",
+ "vsub",
+ "x",
+ "y",
+ "n", ///< number of frame
+ "pos", ///< position in the file
+ "t", ///< timestamp expressed in seconds
NULL
};
enum var_name {
- VAR_E,
- VAR_PHI,
- VAR_PI,
VAR_MAIN_W, VAR_MW,
VAR_MAIN_H, VAR_MH,
VAR_OVERLAY_W, VAR_OW,
VAR_OVERLAY_H, VAR_OH,
+ VAR_HSUB,
+ VAR_VSUB,
+ VAR_X,
+ VAR_Y,
+ VAR_N,
+ VAR_POS,
+ VAR_T,
VAR_VARS_NB
};
#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 max_plane_step[4]; ///< steps per pixel for each plane
+ int allow_packed_rgb;
+ uint8_t frame_requested;
+ uint8_t overlay_eof;
+ 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;
+ enum OverlayFormat { OVERLAY_FORMAT_YUV420, OVERLAY_FORMAT_YUV444, OVERLAY_FORMAT_RGB, OVERLAY_FORMAT_NB} format;
+ enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode;
+
+ AVFrame *overpicref;
+ struct FFBufQueue queue_main;
+ struct FFBufQueue queue_over;
+
+ 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
+ int shortest; ///< terminate stream when the shortest input terminates
+ int repeatlast; ///< repeat last overlay frame
+ double var_values[VAR_VARS_NB];
char *x_expr, *y_expr;
-
- AVFrame *main;
- AVFrame *over_prev, *over_next;
+ AVExpr *x_pexpr, *y_pexpr;
} OverlayContext;
+static av_cold int init(AVFilterContext *ctx)
+{
+ OverlayContext *s = ctx->priv;
+
+ if (s->allow_packed_rgb) {
+ av_log(ctx, AV_LOG_WARNING,
+ "The rgb option is deprecated and is overriding the format option, use format instead\n");
+ s->format = OVERLAY_FORMAT_RGB;
+ }
+ return 0;
+}
+
static av_cold void uninit(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
- av_frame_free(&s->main);
- av_frame_free(&s->over_prev);
- av_frame_free(&s->over_next);
+ av_frame_free(&s->overpicref);
+ ff_bufqueue_discard_all(&s->queue_main);
+ ff_bufqueue_discard_all(&s->queue_over);
+ av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
+ av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
+}
+
+static inline int normalize_xy(double d, int chroma_sub)
+{
+ if (isnan(d))
+ return INT_MAX;
+ return (int)d & ~((1 << chroma_sub) - 1);
+}
+
+static void eval_expr(AVFilterContext *ctx)
+{
+ OverlayContext *s = ctx->priv;
+
+ s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
+ s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
+ s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
+ s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
+ s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
+}
+
+static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
+{
+ int ret;
+ AVExpr *old = NULL;
+
+ if (*pexpr)
+ old = *pexpr;
+ ret = av_expr_parse(pexpr, expr, var_names,
+ NULL, NULL, NULL, NULL, 0, log_ctx);
+ if (ret < 0) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Error when evaluating the expression '%s' for %s\n",
+ expr, option);
+ *pexpr = old;
+ return ret;
+ }
+
+ av_expr_free(old);
+ return 0;
+}
+
+static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
+ char *res, int res_len, int flags)
+{
+ OverlayContext *s = ctx->priv;
+ int ret;
+
+ if (!strcmp(cmd, "x"))
+ ret = set_expr(&s->x_pexpr, args, cmd, ctx);
+ else if (!strcmp(cmd, "y"))
+ ret = set_expr(&s->y_pexpr, args, cmd, ctx);
+ else
+ ret = AVERROR(ENOSYS);
+
+ if (ret < 0)
+ return ret;
+
+ if (s->eval_mode == EVAL_MODE_INIT) {
+ eval_expr(ctx);
+ av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
+ s->var_values[VAR_X], s->x,
+ s->var_values[VAR_Y], s->y);
+ }
+ return ret;
}
static int query_formats(AVFilterContext *ctx)
{
- const enum AVPixelFormat inout_pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE };
- const enum AVPixelFormat blend_pix_fmts[] = { AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE };
- AVFilterFormats *inout_formats = ff_make_format_list(inout_pix_fmts);
- AVFilterFormats *blend_formats = ff_make_format_list(blend_pix_fmts);
+ OverlayContext *s = ctx->priv;
+
+ /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
+ static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
+ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
+ };
+ static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
+ AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
+ };
+
+ static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
+ };
+ static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
+ AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
+ };
+
+ static const enum AVPixelFormat main_pix_fmts_rgb[] = {
+ AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
+ AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
+ AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
+ AV_PIX_FMT_NONE
+ };
+ static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
+ AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
+ AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
+ AV_PIX_FMT_NONE
+ };
+
+ AVFilterFormats *main_formats;
+ AVFilterFormats *overlay_formats;
+
+ switch (s->format) {
+ case OVERLAY_FORMAT_YUV420:
+ main_formats = ff_make_format_list(main_pix_fmts_yuv420);
+ overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420);
+ break;
+ case OVERLAY_FORMAT_YUV444:
+ main_formats = ff_make_format_list(main_pix_fmts_yuv444);
+ overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444);
+ break;
+ case OVERLAY_FORMAT_RGB:
+ main_formats = ff_make_format_list(main_pix_fmts_rgb);
+ overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb);
+ break;
+ default:
+ av_assert0(0);
+ }
- ff_formats_ref(inout_formats, &ctx->inputs [MAIN ]->out_formats);
- ff_formats_ref(blend_formats, &ctx->inputs [OVERLAY]->out_formats);
- ff_formats_ref(inout_formats, &ctx->outputs[MAIN ]->in_formats );
+ ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats);
+ ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
+ ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats );
return 0;
}
+static const enum AVPixelFormat alpha_pix_fmts[] = {
+ AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P,
+ AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
+ AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE
+};
+
static int config_input_main(AVFilterLink *inlink)
{
OverlayContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
- av_image_fill_max_pixsteps(s->max_plane_step, NULL, pix_desc);
+ av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
+
s->hsub = pix_desc->log2_chroma_w;
s->vsub = pix_desc->log2_chroma_h;
+ s->main_is_packed_rgb =
+ ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
+ s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
return 0;
}
{
AVFilterContext *ctx = inlink->dst;
OverlayContext *s = inlink->dst->priv;
- char *expr;
- double var_values[VAR_VARS_NB], res;
int ret;
+ const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
+
+ av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc);
/* Finish the configuration by evaluating the expressions
now when both inputs are configured. */
- var_values[VAR_E ] = M_E;
- var_values[VAR_PHI] = M_PHI;
- var_values[VAR_PI ] = M_PI;
-
- var_values[VAR_MAIN_W ] = var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
- var_values[VAR_MAIN_H ] = var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
- var_values[VAR_OVERLAY_W] = var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
- var_values[VAR_OVERLAY_H] = var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
-
- if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr), var_names, var_values,
- NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
- goto fail;
- s->x = res;
- if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr), var_names, var_values,
- NULL, NULL, NULL, NULL, NULL, 0, ctx)))
- goto fail;
- s->y = res;
- /* x may depend on y */
- if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr), var_names, var_values,
- NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
- goto fail;
- s->x = res;
+ s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
+ s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
+ s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
+ s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
+ s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
+ s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
+ s->var_values[VAR_X] = NAN;
+ s->var_values[VAR_Y] = NAN;
+ s->var_values[VAR_N] = 0;
+ s->var_values[VAR_T] = NAN;
+ s->var_values[VAR_POS] = NAN;
+
+ if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
+ (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
+ return ret;
+
+ s->overlay_is_packed_rgb =
+ ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
+ s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
+
+ if (s->eval_mode == EVAL_MODE_INIT) {
+ eval_expr(ctx);
+ av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
+ s->var_values[VAR_X], s->x,
+ s->var_values[VAR_Y], s->y);
+ }
av_log(ctx, AV_LOG_VERBOSE,
- "main w:%d h:%d fmt:%s overlay x:%d y:%d w:%d h:%d fmt:%s\n",
+ "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s\n",
ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
- s->x, s->y,
ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));
-
- if (s->x < 0 || s->y < 0 ||
- s->x + var_values[VAR_OVERLAY_W] > var_values[VAR_MAIN_W] ||
- s->y + var_values[VAR_OVERLAY_H] > var_values[VAR_MAIN_H]) {
- av_log(ctx, AV_LOG_ERROR,
- "Overlay area (%d,%d)<->(%d,%d) not within the main area (0,0)<->(%d,%d) or zero-sized\n",
- s->x, s->y,
- (int)(s->x + var_values[VAR_OVERLAY_W]),
- (int)(s->y + var_values[VAR_OVERLAY_H]),
- (int)var_values[VAR_MAIN_W], (int)var_values[VAR_MAIN_H]);
- return AVERROR(EINVAL);
- }
return 0;
-
-fail:
- av_log(NULL, AV_LOG_ERROR,
- "Error when evaluating the expression '%s'\n", expr);
- return ret;
}
static int config_output(AVFilterLink *outlink)
return 0;
}
-static void blend_frame(AVFilterContext *ctx,
+// 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)
+
+// calculate the unpremultiplied alpha, applying the general equation:
+// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
+// (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
+// ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
+#define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
+
+/**
+ * Blend image in src to destination buffer dst at position (x, y).
+ */
+static void blend_image(AVFilterContext *ctx,
AVFrame *dst, AVFrame *src,
int x, int y)
{
OverlayContext *s = ctx->priv;
- int i, j, k;
- int width, height;
- int overlay_end_y = y + src->height;
- int end_y, start_y;
-
- width = FFMIN(dst->width - x, src->width);
- end_y = FFMIN(dst->height, overlay_end_y);
- start_y = FFMAX(y, 0);
- height = end_y - start_y;
-
- if (dst->format == AV_PIX_FMT_BGR24 || dst->format == AV_PIX_FMT_RGB24) {
- uint8_t *dp = dst->data[0] + x * 3 + start_y * dst->linesize[0];
- uint8_t *sp = src->data[0];
- int b = dst->format == AV_PIX_FMT_BGR24 ? 2 : 0;
- int r = dst->format == AV_PIX_FMT_BGR24 ? 0 : 2;
- if (y < 0)
- sp += -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;
+ int i, imax, j, jmax, k, kmax;
+ const int src_w = src->width;
+ const int src_h = src->height;
+ const int dst_w = dst->width;
+ const int dst_h = dst->height;
+
+ if (x >= dst_w || x+dst_w < 0 ||
+ y >= dst_h || y+dst_h < 0)
+ return; /* no intersection */
+
+ if (s->main_is_packed_rgb) {
+ uint8_t alpha; ///< the amount of overlay to blend on to main
+ const int dr = s->main_rgba_map[R];
+ const int dg = s->main_rgba_map[G];
+ const int db = s->main_rgba_map[B];
+ const int da = s->main_rgba_map[A];
+ const int dstep = s->main_pix_step[0];
+ const int sr = s->overlay_rgba_map[R];
+ const int sg = s->overlay_rgba_map[G];
+ const int sb = s->overlay_rgba_map[B];
+ const int sa = s->overlay_rgba_map[A];
+ const int sstep = s->overlay_pix_step[0];
+ const int main_has_alpha = s->main_has_alpha;
+ uint8_t *s, *sp, *d, *dp;
+
+ i = FFMAX(-y, 0);
+ sp = src->data[0] + i * src->linesize[0];
+ dp = dst->data[0] + (y+i) * dst->linesize[0];
+
+ for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
+ j = FFMAX(-x, 0);
+ s = sp + j * sstep;
+ d = dp + (x+j) * dstep;
+
+ for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
+ alpha = s[sa];
+
+ // if the main channel has an alpha channel, alpha has to be calculated
+ // to create an un-premultiplied (straight) alpha value
+ if (main_has_alpha && alpha != 0 && alpha != 255) {
+ uint8_t alpha_d = d[da];
+ alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
+ }
+
+ 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);
+ }
+ if (main_has_alpha) {
+ switch (alpha) {
+ case 0:
+ break;
+ case 255:
+ d[da] = s[sa];
+ break;
+ default:
+ // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
+ d[da] += FAST_DIV255((255 - d[da]) * s[sa]);
+ }
+ }
+ d += dstep;
+ s += sstep;
}
dp += dst->linesize[0];
sp += src->linesize[0];
}
} else {
+ const int main_has_alpha = s->main_has_alpha;
+ if (main_has_alpha) {
+ uint8_t alpha; ///< the amount of overlay to blend on to main
+ uint8_t *s, *sa, *d, *da;
+
+ i = FFMAX(-y, 0);
+ sa = src->data[3] + i * src->linesize[3];
+ da = dst->data[3] + (y+i) * dst->linesize[3];
+
+ for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
+ j = FFMAX(-x, 0);
+ s = sa + j;
+ d = da + x+j;
+
+ for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
+ alpha = *s;
+ if (alpha != 0 && alpha != 255) {
+ uint8_t alpha_d = *d;
+ alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
+ }
+ switch (alpha) {
+ case 0:
+ break;
+ case 255:
+ *d = *s;
+ break;
+ default:
+ // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
+ *d += FAST_DIV255((255 - *d) * *s);
+ }
+ d += 1;
+ s += 1;
+ }
+ da += dst->linesize[3];
+ sa += src->linesize[3];
+ }
+ }
for (i = 0; i < 3; i++) {
int hsub = i ? s->hsub : 0;
int vsub = i ? s->vsub : 0;
- uint8_t *dp = dst->data[i] + (x >> hsub) +
- (start_y >> vsub) * dst->linesize[i];
- uint8_t *sp = src->data[i];
- uint8_t *ap = src->data[3];
- int wp = FFALIGN(width, 1<<hsub) >> hsub;
- int hp = FFALIGN(height, 1<<vsub) >> vsub;
- if (y < 0) {
- sp += ((-y) >> vsub) * src->linesize[i];
- ap += -y * src->linesize[3];
- }
- for (j = 0; j < hp; j++) {
- uint8_t *d = dp, *s = sp, *a = ap;
- for (k = 0; k < wp; k++) {
- // average alpha for color components, improve quality
+ int src_wp = FF_CEIL_RSHIFT(src_w, hsub);
+ int src_hp = FF_CEIL_RSHIFT(src_h, vsub);
+ int dst_wp = FF_CEIL_RSHIFT(dst_w, hsub);
+ int dst_hp = FF_CEIL_RSHIFT(dst_h, vsub);
+ int yp = y>>vsub;
+ int xp = x>>hsub;
+ uint8_t *s, *sp, *d, *dp, *a, *ap;
+
+ j = FFMAX(-yp, 0);
+ sp = src->data[i] + j * src->linesize[i];
+ dp = dst->data[i] + (yp+j) * dst->linesize[i];
+ ap = src->data[3] + (j<<vsub) * src->linesize[3];
+
+ for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
+ k = FFMAX(-xp, 0);
+ d = dp + xp+k;
+ s = sp + k;
+ a = ap + (k<<hsub);
+
+ for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
int alpha_v, alpha_h, alpha;
- if (hsub && vsub && j+1 < hp && k+1 < wp) {
+
+ // average alpha for color components, improve quality
+ if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
alpha = (a[0] + a[src->linesize[3]] +
a[1] + a[src->linesize[3]+1]) >> 2;
} else if (hsub || vsub) {
- alpha_h = hsub && k+1 < wp ?
+ alpha_h = hsub && k+1 < src_wp ?
(a[0] + a[1]) >> 1 : a[0];
- alpha_v = vsub && j+1 < hp ?
+ alpha_v = vsub && j+1 < src_hp ?
(a[0] + a[src->linesize[3]]) >> 1 : a[0];
alpha = (alpha_v + alpha_h) >> 1;
} else
alpha = a[0];
- *d = (*d * (0xff - alpha) + *s++ * alpha + 128) >> 8;
+ // if the main channel has an alpha channel, alpha has to be calculated
+ // to create an un-premultiplied (straight) alpha value
+ if (main_has_alpha && alpha != 0 && alpha != 255) {
+ // average alpha for color components, improve quality
+ uint8_t alpha_d;
+ if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
+ alpha_d = (d[0] + d[src->linesize[3]] +
+ d[1] + d[src->linesize[3]+1]) >> 2;
+ } else if (hsub || vsub) {
+ alpha_h = hsub && k+1 < src_wp ?
+ (d[0] + d[1]) >> 1 : d[0];
+ alpha_v = vsub && j+1 < src_hp ?
+ (d[0] + d[src->linesize[3]]) >> 1 : d[0];
+ alpha_d = (alpha_v + alpha_h) >> 1;
+ } else
+ alpha_d = d[0];
+ alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
+ }
+ *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
+ s++;
d++;
a += 1 << hsub;
}
}
}
-static int filter_frame_main(AVFilterLink *inlink, AVFrame *frame)
+static int try_filter_frame(AVFilterContext *ctx, AVFrame *mainpic)
{
- OverlayContext *s = inlink->dst->priv;
+ OverlayContext *s = ctx->priv;
+ AVFilterLink *inlink = ctx->inputs[0];
+ AVFrame *next_overpic;
+ int ret;
- av_assert0(!s->main);
- s->main = frame;
+ /* Discard obsolete overlay frames: if there is a next overlay frame with pts
+ * before the main frame, we can drop the current overlay. */
+ while (1) {
+ next_overpic = ff_bufqueue_peek(&s->queue_over, 0);
+ if (!next_overpic && s->overlay_eof && !s->repeatlast) {
+ av_frame_free(&s->overpicref);
+ break;
+ }
+ if (!next_overpic || av_compare_ts(next_overpic->pts, ctx->inputs[OVERLAY]->time_base,
+ mainpic->pts , ctx->inputs[MAIN]->time_base) > 0)
+ break;
+ ff_bufqueue_get(&s->queue_over);
+ av_frame_free(&s->overpicref);
+ s->overpicref = next_overpic;
+ }
- return 0;
+ /* If there is no next frame and no EOF and the overlay frame is before
+ * the main frame, we can not know yet if it will be superseded. */
+ if (!s->queue_over.available && !s->overlay_eof &&
+ (!s->overpicref || av_compare_ts(s->overpicref->pts, ctx->inputs[OVERLAY]->time_base,
+ mainpic->pts , ctx->inputs[MAIN]->time_base) < 0))
+ return AVERROR(EAGAIN);
+
+ /* At this point, we know that the current overlay frame extends to the
+ * time of the main frame. */
+ av_dlog(ctx, "main_pts:%s main_pts_time:%s",
+ av_ts2str(mainpic->pts), av_ts2timestr(mainpic->pts, &ctx->inputs[MAIN]->time_base));
+ if (s->overpicref)
+ av_dlog(ctx, " over_pts:%s over_pts_time:%s",
+ av_ts2str(s->overpicref->pts), av_ts2timestr(s->overpicref->pts, &ctx->inputs[OVERLAY]->time_base));
+ av_dlog(ctx, "\n");
+
+ if (s->overpicref) {
+ if (s->eval_mode == EVAL_MODE_FRAME) {
+ int64_t pos = av_frame_get_pkt_pos(mainpic);
+
+ s->var_values[VAR_N] = inlink->frame_count;
+ s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
+ NAN : mainpic->pts * av_q2d(inlink->time_base);
+ s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
+
+ eval_expr(ctx);
+ av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
+ s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
+ s->var_values[VAR_X], s->x,
+ s->var_values[VAR_Y], s->y);
+ }
+ if (!ctx->is_disabled)
+ blend_image(ctx, mainpic, s->overpicref, s->x, s->y);
+
+ }
+ ret = ff_filter_frame(ctx->outputs[0], mainpic);
+ av_assert1(ret != AVERROR(EAGAIN));
+ s->frame_requested = 0;
+ return ret;
}
-static int filter_frame_overlay(AVFilterLink *inlink, AVFrame *frame)
+static int try_filter_next_frame(AVFilterContext *ctx)
{
- OverlayContext *s = inlink->dst->priv;
+ OverlayContext *s = ctx->priv;
+ AVFrame *next_mainpic = ff_bufqueue_peek(&s->queue_main, 0);
+ int ret;
- av_assert0(!s->over_next);
- s->over_next = frame;
+ if (!next_mainpic)
+ return AVERROR(EAGAIN);
+ if ((ret = try_filter_frame(ctx, next_mainpic)) == AVERROR(EAGAIN))
+ return ret;
+ ff_bufqueue_get(&s->queue_main);
+ return ret;
+}
- return 0;
+static int flush_frames(AVFilterContext *ctx)
+{
+ int ret;
+
+ while (!(ret = try_filter_next_frame(ctx)));
+ return ret == AVERROR(EAGAIN) ? 0 : ret;
}
-static int output_frame(AVFilterContext *ctx)
+static int filter_frame_main(AVFilterLink *inlink, AVFrame *inpicref)
{
+ AVFilterContext *ctx = inlink->dst;
OverlayContext *s = ctx->priv;
- AVFilterLink *outlink = ctx->outputs[0];
- int ret = ff_filter_frame(outlink, s->main);
- s->main = NULL;
+ int ret;
- return ret;
+ if ((ret = flush_frames(ctx)) < 0)
+ return ret;
+ if ((ret = try_filter_frame(ctx, inpicref)) < 0) {
+ if (ret != AVERROR(EAGAIN))
+ return ret;
+ ff_bufqueue_add(ctx, &s->queue_main, inpicref);
+ }
+
+ if (!s->overpicref)
+ return 0;
+ flush_frames(ctx);
+
+ return 0;
}
-static int handle_overlay_eof(AVFilterContext *ctx)
+static int filter_frame_over(AVFilterLink *inlink, AVFrame *inpicref)
{
+ AVFilterContext *ctx = inlink->dst;
OverlayContext *s = ctx->priv;
- if (s->over_prev)
- blend_frame(ctx, s->main, s->over_prev, s->x, s->y);
- return output_frame(ctx);
+ int ret;
+
+ if ((ret = flush_frames(ctx)) < 0)
+ return ret;
+ ff_bufqueue_add(ctx, &s->queue_over, inpicref);
+ ret = try_filter_next_frame(ctx);
+ return ret == AVERROR(EAGAIN) ? 0 : ret;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
- OverlayContext *s = ctx->priv;
- AVRational tb_main = ctx->inputs[MAIN]->time_base;
- AVRational tb_over = ctx->inputs[OVERLAY]->time_base;
- int ret = 0;
-
- /* get a frame on the main input */
- if (!s->main) {
- ret = ff_request_frame(ctx->inputs[MAIN]);
+ OverlayContext *s = ctx->priv;
+ int input, ret;
+
+ if (!try_filter_next_frame(ctx))
+ return 0;
+ s->frame_requested = 1;
+ while (s->frame_requested) {
+ /* TODO if we had a frame duration, we could guess more accurately */
+ input = !s->overlay_eof && (s->queue_main.available ||
+ s->queue_over.available < 2) ?
+ OVERLAY : MAIN;
+ ret = ff_request_frame(ctx->inputs[input]);
+ /* EOF on main is reported immediately */
+ if (ret == AVERROR_EOF && input == OVERLAY) {
+ s->overlay_eof = 1;
+ if (s->shortest)
+ return ret;
+ if ((ret = try_filter_next_frame(ctx)) != AVERROR(EAGAIN))
+ return ret;
+ ret = 0; /* continue requesting frames on main */
+ }
if (ret < 0)
return ret;
}
-
- /* get a new frame on the overlay input, on EOF
- * reuse previous */
- if (!s->over_next) {
- ret = ff_request_frame(ctx->inputs[OVERLAY]);
- if (ret == AVERROR_EOF)
- return handle_overlay_eof(ctx);
- else if (ret < 0)
- return ret;
- }
-
- while (s->main->pts != AV_NOPTS_VALUE &&
- s->over_next->pts != AV_NOPTS_VALUE &&
- av_compare_ts(s->over_next->pts, tb_over, s->main->pts, tb_main) < 0) {
- av_frame_free(&s->over_prev);
- FFSWAP(AVFrame*, s->over_prev, s->over_next);
-
- ret = ff_request_frame(ctx->inputs[OVERLAY]);
- if (ret == AVERROR_EOF)
- return handle_overlay_eof(ctx);
- else if (ret < 0)
- return ret;
- }
-
- if (s->main->pts == AV_NOPTS_VALUE ||
- s->over_next->pts == AV_NOPTS_VALUE ||
- !av_compare_ts(s->over_next->pts, tb_over, s->main->pts, tb_main)) {
- blend_frame(ctx, s->main, s->over_next, s->x, s->y);
- av_frame_free(&s->over_prev);
- FFSWAP(AVFrame*, s->over_prev, s->over_next);
- } else if (s->over_prev) {
- blend_frame(ctx, s->main, s->over_prev, s->x, s->y);
- }
-
- return output_frame(ctx);
+ return 0;
}
#define OFFSET(x) offsetof(OverlayContext, x)
-#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
-static const AVOption options[] = {
- { "x", "Horizontal position of the left edge of the overlaid video on the "
- "main video.", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
- { "y", "Vertical position of the top edge of the overlaid video on the "
- "main video.", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
- { NULL },
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption overlay_options[] = {
+ { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
+ { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
+ { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
+ { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
+ { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
+ { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
+ { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
+ { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
+ { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
+ { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
+ { NULL }
};
-static const AVClass overlay_class = {
- .class_name = "overlay",
- .item_name = av_default_item_name,
- .option = options,
- .version = LIBAVUTIL_VERSION_INT,
-};
+AVFILTER_DEFINE_CLASS(overlay);
static const AVFilterPad avfilter_vf_overlay_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = ff_null_get_video_buffer,
.config_props = config_input_main,
.filter_frame = filter_frame_main,
.needs_writable = 1,
- .needs_fifo = 1,
},
{
.name = "overlay",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_overlay,
- .filter_frame = filter_frame_overlay,
- .needs_fifo = 1,
+ .filter_frame = filter_frame_over,
},
{ NULL }
};
.name = "overlay",
.description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
+ .init = init,
.uninit = uninit,
.priv_size = sizeof(OverlayContext),
.priv_class = &overlay_class,
.query_formats = query_formats,
+ .process_command = process_command,
.inputs = avfilter_vf_overlay_inputs,
.outputs = avfilter_vf_overlay_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
projects / ffmpeg / blobdiff