[PATCH] Implement SDL display sink.
Stefano Sabatini
stefano.sabatini-lala
Wed Dec 1 17:44:12 CET 2010
---
configure | 2 +
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vsink_sdldisplay.c | 159 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 163 insertions(+), 0 deletions(-)
create mode 100644 libavfilter/vsink_sdldisplay.c
diff --git a/configure b/configure
index a882501..dba6e26 100755
--- a/configure
+++ b/configure
@@ -1408,6 +1408,7 @@ cropdetect_filter_deps="gpl"
frei0r_filter_deps="frei0r dlopen strtok_r"
frei0r_src_filter_deps="frei0r dlopen strtok_r"
ocv_smooth_filter_deps="libopencv"
+sdldisplay_filter_deps="sdl"
yadif_filter_deps="gpl"
# libraries
@@ -2796,6 +2797,7 @@ if "${SDL_CONFIG}" --version > /dev/null 2>&1; then
enable sdl &&
check_struct SDL.h SDL_VideoInfo current_w $sdl_cflags && enable sdl_video_size
fi
+enabled sdl && add_cflags $sdl_cflags && add_extralibs $sdl_libs
texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index a8237c5..201659c 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -51,6 +51,7 @@ OBJS-$(CONFIG_FREI0R_SRC_FILTER) += vf_frei0r.o
OBJS-$(CONFIG_NULLSRC_FILTER) += vsrc_nullsrc.o
OBJS-$(CONFIG_NULLSINK_FILTER) += vsink_nullsink.o
+OBJS-$(CONFIG_SDLDISPLAY_FILTER) += vsink_sdldisplay.o
-include $(SUBDIR)$(ARCH)/Makefile
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 56ff02d..dd6103d 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -72,4 +72,5 @@ void avfilter_register_all(void)
REGISTER_FILTER (NULLSRC, nullsrc, vsrc);
REGISTER_FILTER (NULLSINK, nullsink, vsink);
+ REGISTER_FILTER (SDLDISPLAY, sdldisplay, vsink);
}
diff --git a/libavfilter/vsink_sdldisplay.c b/libavfilter/vsink_sdldisplay.c
new file mode 100644
index 0000000..9044b8c
--- /dev/null
+++ b/libavfilter/vsink_sdldisplay.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2010 Stefano Sabatini
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "SDL.h"
+#include "avfilter.h"
+
+typedef struct {
+ SDL_Surface *surface;
+ SDL_Overlay *overlay;
+} DisplayContext;
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ if (SDL_Init(SDL_INIT_VIDEO) != 0) {
+ av_log(ctx, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+av_cold static void uninit(AVFilterContext *ctx)
+{
+ DisplayContext *dpy = ctx->priv;
+
+ if (dpy->overlay) {
+ SDL_FreeYUVOverlay(dpy->overlay);
+ dpy->overlay = NULL;
+ }
+ SDL_Quit();
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum PixelFormat pix_fmts[] = {
+ PIX_FMT_YUV420P, PIX_FMT_NONE
+ };
+
+ avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int config_props(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ DisplayContext *dpy = ctx->priv;
+
+ dpy->surface = SDL_SetVideoMode(inlink->w, inlink->h, 24, SDL_SWSURFACE);
+ if (!dpy->surface) {
+ av_log(ctx, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
+ return AVERROR(EINVAL);
+ }
+
+ /* fixme: make this customizable */
+ /* SDL_WM_SetCaption("SDL video display", "SDL video display"); */
+
+ dpy->overlay = SDL_CreateYUVOverlay(inlink->w, inlink->h,
+ SDL_YV12_OVERLAY, dpy->surface);
+ if (!dpy->overlay || dpy->overlay->pitches[0] < inlink->w) {
+ av_log(ctx, AV_LOG_ERROR,
+ "The SDL video system does not support an image with size of %dx%d pixels.\n",
+ inlink->w, inlink->h);
+ return AVERROR(EINVAL);
+ }
+
+ SDL_FillRect(dpy->surface, &dpy->surface->clip_rect,
+ SDL_MapRGB(dpy->surface->format, 0, 0, 0));
+
+ return 0;
+}
+
+static void null_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) { }
+
+static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
+
+static void end_frame(AVFilterLink *inlink) {
+ AVFilterContext *ctx = inlink->dst;
+ DisplayContext *dpy = ctx->priv;
+ AVFilterBufferRef *inpic = inlink->cur_buf;
+ float aspect_ratio;
+ int width, height;
+ SDL_Rect rect;
+
+ if (inpic->video->pixel_aspect.num == 0)
+ aspect_ratio = 0;
+ else
+ aspect_ratio = av_q2d(inpic->video->pixel_aspect);
+
+ if (aspect_ratio <= 0.0)
+ aspect_ratio = 1.0;
+ aspect_ratio *= (float)inlink->w / (float)inlink->h;
+
+ /* XXX: we suppose the screen has a 1.0 pixel ratio */
+ height = inlink->h;
+ width = ((int)rint(height * aspect_ratio)) & ~1;
+ if (width > inlink->w) {
+ width = inlink->w;
+ height = ((int)rint(width / aspect_ratio)) & ~1;
+ }
+
+ rect.x = 0;
+ rect.y = 0;
+ rect.w = width;
+ rect.h = height;
+
+ SDL_LockYUVOverlay(dpy->overlay);
+ dpy->overlay->pixels[0] = inpic->data[0];
+ dpy->overlay->pixels[2] = inpic->data[1];
+ dpy->overlay->pixels[1] = inpic->data[2];
+
+ dpy->overlay->pitches[0] = inpic->linesize[0];
+ dpy->overlay->pitches[2] = inpic->linesize[1];
+ dpy->overlay->pitches[1] = inpic->linesize[2];
+
+ SDL_DisplayYUVOverlay(dpy->overlay, &rect);
+ SDL_UnlockYUVOverlay(dpy->overlay);
+
+ SDL_UpdateRect(dpy->surface, 0, 0, inlink->w, inlink->h);
+ avfilter_unref_buffer(inpic);
+}
+
+AVFilter avfilter_vsink_sdldisplay = {
+ .name = "sdldisplay",
+ .description = NULL_IF_CONFIG_SMALL("Display the input video in a SDL window."),
+ .priv_size = sizeof(DisplayContext),
+
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+
+ .inputs = (AVFilterPad[]) {{
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_props,
+ .start_frame = null_start_frame,
+ .draw_slice = null_draw_slice,
+ .end_frame = end_frame, },
+
+ { .name = NULL},
+ },
+ .outputs = (AVFilterPad[]) {{ .name = NULL }},
+};
--
1.7.1
--1LKvkjL3sHcu1TtY--
More information about the ffmpeg-devel
mailing list