[FFmpeg-devel] [PATCH] avdevice: add fbdev output device

Lukasz Marek lukasz.m.luki at gmail.com
Fri Oct 18 23:11:12 CEST 2013


Signed-off-by: Lukasz Marek <lukasz.m.luki at gmail.com>
---
 Changelog                |    1 +
 configure                |    1 +
 doc/outdevs.texi         |   31 ++++++
 libavdevice/Makefile     |    1 +
 libavdevice/alldevices.c |    2 +-
 libavdevice/fbdev_enc.c  |  256 ++++++++++++++++++++++++++++++++++++++++++++++
 libavdevice/version.h    |    2 +-
 7 files changed, 292 insertions(+), 2 deletions(-)
 create mode 100644 libavdevice/fbdev_enc.c

diff --git a/Changelog b/Changelog
index ee58336..e196d8e 100644
--- a/Changelog
+++ b/Changelog
@@ -40,6 +40,7 @@ version <next>
 - dpx parser
 - max_error_rate parameter in ffmpeg
 - PulseAudio output device
+- Linux framebuffer output device
 
 
 version 2.0:
diff --git a/configure b/configure
index 101954e..0eb62b3 100755
--- a/configure
+++ b/configure
@@ -2125,6 +2125,7 @@ dshow_indev_extralibs="-lpsapi -lole32 -lstrmiids -luuid"
 dv1394_indev_deps="dv1394"
 dv1394_indev_select="dv_demuxer"
 fbdev_indev_deps="linux_fb_h"
+fbdev_outdev_deps="linux_fb_h"
 iec61883_indev_deps="libiec61883"
 jack_indev_deps="jack_jack_h sem_timedwait"
 lavfi_indev_deps="avfilter"
diff --git a/doc/outdevs.texi b/doc/outdevs.texi
index 55c9110..569b402 100644
--- a/doc/outdevs.texi
+++ b/doc/outdevs.texi
@@ -104,6 +104,37 @@ ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
 @end example
 @end itemize
 
+ at section fbdev
+
+Linux framebuffer output device.
+
+The Linux framebuffer is a graphic hardware-independent abstraction
+layer to show graphics on a computer monitor, typically on the
+console. It is accessed through a file device node, usually
+ at file{/dev/fb0}.
+
+For more detailed information read the file
+Documentation/fb/framebuffer.txt included in the Linux source tree.
+
+ at subsection Options
+ at table @option
+
+ at item xoffset
+Set x coordinate of top left corner. Default is 0.
+
+ at item yoffset
+Set y coordinate of top left corner. Default is 0.
+ at end table
+
+ at subsection Examples
+Play a file on framebuffer device @file{/dev/fb0}.
+Required pixel format depends on current framebuffer settings.
+ at example
+ffmpeg -re -i INPUT -vcodec rawvideo -pix_fmt bgra -f fbdev /dev/fb0
+ at end example
+
+See also @url{http://linux-fbdev.sourceforge.net/}, and fbset(1).
+
 @section oss
 
 OSS (Open Sound System) output device.
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index ad959ee..f6f05e5 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -24,6 +24,7 @@ OBJS-$(CONFIG_DSHOW_INDEV)               += dshow.o dshow_enummediatypes.o \
                                             dshow_pin.o dshow_common.o
 OBJS-$(CONFIG_DV1394_INDEV)              += dv1394.o
 OBJS-$(CONFIG_FBDEV_INDEV)               += fbdev.o
+OBJS-$(CONFIG_FBDEV_OUTDEV)              += fbdev_enc.o
 OBJS-$(CONFIG_IEC61883_INDEV)            += iec61883.o
 OBJS-$(CONFIG_JACK_INDEV)                += jack_audio.o timefilter.o
 OBJS-$(CONFIG_LAVFI_INDEV)               += lavfi.o
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index 33ce155..5178f30 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -51,7 +51,7 @@ void avdevice_register_all(void)
     REGISTER_OUTDEV  (CACA,             caca);
     REGISTER_INDEV   (DSHOW,            dshow);
     REGISTER_INDEV   (DV1394,           dv1394);
-    REGISTER_INDEV   (FBDEV,            fbdev);
+    REGISTER_INOUTDEV(FBDEV,            fbdev);
     REGISTER_INDEV   (IEC61883,         iec61883);
     REGISTER_INDEV   (JACK,             jack);
     REGISTER_INDEV   (LAVFI,            lavfi);
diff --git a/libavdevice/fbdev_enc.c b/libavdevice/fbdev_enc.c
new file mode 100644
index 0000000..d92a6d1
--- /dev/null
+++ b/libavdevice/fbdev_enc.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2013 Lukasz Marek
+ *
+ * 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 <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <linux/fb.h>
+#include "libavutil/pixdesc.h"
+#include "libavutil/log.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+#include "libavformat/avformat.h"
+
+typedef struct {
+    AVClass *class;                   ///< class for private options
+    int xoffset;                      ///< x coordinate of top left corner
+    int yoffset;                      ///< y coordinate of top left corner
+    struct fb_var_screeninfo varinfo; ///< variable info;
+    struct fb_fix_screeninfo fixinfo; ///< fixed info;
+    int fd;                           ///< framebuffer device file descriptor
+    int stream_index;                 ///< Index of a video stream
+    uint8_t *data;                    ///< framebuffer data
+    int width;
+    int height;
+    int bpp;
+    enum AVPixelFormat pix_fmt;
+} FBDevContext;
+
+struct rgb_pixfmt_map_entry {
+    int bits_per_pixel;
+    int red_offset, green_offset, blue_offset, alpha_offset;
+    enum AVPixelFormat pixfmt;
+};
+
+static const struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = {
+    // bpp, red_offset,  green_offset, blue_offset, alpha_offset, pixfmt
+    {  32,       0,           8,          16,           24,   AV_PIX_FMT_RGBA  },
+    {  32,      16,           8,           0,           24,   AV_PIX_FMT_BGRA  },
+    {  32,       8,          16,          24,            0,   AV_PIX_FMT_ARGB  },
+    {  32,       3,           2,           8,            0,   AV_PIX_FMT_ABGR  },
+    {  24,       0,           8,          16,            0,   AV_PIX_FMT_RGB24 },
+    {  24,      16,           8,           0,            0,   AV_PIX_FMT_BGR24 },
+    {  16,      11,           5,           0,           16,   AV_PIX_FMT_RGB565 },
+};
+
+static enum AVPixelFormat get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo)
+{
+    int i;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(rgb_pixfmt_map); i++) {
+        const struct rgb_pixfmt_map_entry *entry = &rgb_pixfmt_map[i];
+        if (entry->bits_per_pixel == varinfo->bits_per_pixel &&
+            entry->red_offset     == varinfo->red.offset     &&
+            entry->green_offset   == varinfo->green.offset   &&
+            entry->blue_offset    == varinfo->blue.offset)
+            return entry->pixfmt;
+    }
+
+    return AV_PIX_FMT_NONE;
+}
+
+static av_cold int fbdev_write_header(AVFormatContext *h)
+{
+    FBDevContext *s = h->priv_data;
+    enum AVPixelFormat pix_fmt;
+    AVStream *st = NULL;
+    int ret, flags = O_RDWR;
+
+    for (int i = 0; i < h->nb_streams; i++) {
+        if (h->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
+            s->stream_index = i;
+            st = h->streams[i];
+            break;
+        }
+    }
+    if (!st) {
+        av_log(h, AV_LOG_ERROR, "No video stream found.\n");
+        return AVERROR(EINVAL);
+    }
+
+    if ((s->fd = avpriv_open(h->filename, flags)) == -1) {
+        ret = AVERROR(errno);
+        av_log(h, AV_LOG_ERROR,
+               "Could not open framebuffer device '%s': %s\n",
+               h->filename, strerror(ret));
+        return ret;
+    }
+
+    if (ioctl(s->fd, FBIOGET_VSCREENINFO, &s->varinfo) < 0) {
+        ret = AVERROR(errno);
+        av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", strerror(errno));
+        goto fail;
+    }
+
+    if (ioctl(s->fd, FBIOGET_FSCREENINFO, &s->fixinfo) < 0) {
+        ret = AVERROR(errno);
+        av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", strerror(errno));
+        goto fail;
+    }
+
+    pix_fmt = get_pixfmt_from_fb_varinfo(&s->varinfo);
+    if (pix_fmt == AV_PIX_FMT_NONE) {
+        ret = AVERROR(EINVAL);
+        av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n");
+        goto fail;
+    }
+
+    s->data = mmap(NULL, s->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, s->fd, 0);
+    if (s->data == MAP_FAILED) {
+        ret = AVERROR(errno);
+        av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", strerror(errno));
+        goto fail;
+    }
+
+    s->pix_fmt = st->codec->pix_fmt;
+    s->width = st->codec->width;
+    s->height = st->codec->height;
+    s->bpp = ((st->codec->bits_per_coded_sample + 7) >> 3);
+
+    return 0;
+  fail:
+    close(s->fd);
+    return ret;
+}
+
+static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt)
+{
+    FBDevContext *s = h->priv_data;
+    uint8_t *pin, *pout;
+    enum AVPixelFormat pix_fmt;
+    int disp_height;
+    int bytes_to_copy;
+    int src_line_size = s->width * s->bpp;
+
+    if (s->stream_index != pkt->stream_index)
+        return 0;
+
+    if (ioctl(s->fd, FBIOGET_VSCREENINFO, &s->varinfo) < 0)
+        av_log(h, AV_LOG_WARNING,
+               "Error refreshing variable info: %s\n", strerror(errno));
+
+    pix_fmt = get_pixfmt_from_fb_varinfo(&s->varinfo);
+
+    //TODO: add mapping between formats
+    if (pix_fmt != s->pix_fmt) {
+        av_log(h, AV_LOG_ERROR, "Not supported pixel format, use %s\n",
+               av_get_pix_fmt_name(pix_fmt));
+        return AVERROR(EINVAL);
+    }
+
+    disp_height = FFMIN(s->varinfo.yres, s->height);
+    bytes_to_copy = FFMIN(s->varinfo.xres, s->width) * s->bpp;
+
+    pin  = pkt->data;
+    pout = s->data +
+           s->bpp * s->varinfo.xoffset +
+           s->varinfo.yoffset * s->fixinfo.line_length;
+
+    if (s->xoffset) {
+        if (s->xoffset < 0) {
+            if (-s->xoffset >= s->width) //nothing to display
+                return 0;
+            bytes_to_copy += s->xoffset * s->bpp;
+            pin -= s->xoffset * s->bpp;
+        }
+        else {
+            int diff = (s->width + s->xoffset) - s->varinfo.xres;
+            if (diff > 0) {
+                if (diff >= s->width) //nothing to display
+                    return 0;
+                bytes_to_copy -= diff * s->bpp;
+            }
+            pout += s->bpp * s->xoffset;
+        }
+    }
+
+    if (s->yoffset) {
+        if (s->yoffset < 0) {
+            if (-s->yoffset >= s->height) //nothing to display
+                return 0;
+            disp_height += s->yoffset;
+            pin -= s->yoffset * src_line_size;
+        }
+        else {
+            int diff = (s->height + s->yoffset) - s->varinfo.yres;
+            if (diff > 0) {
+                if (diff >= s->height) //nothing to display
+                    return 0;
+                disp_height -= diff;
+            }
+            pout += s->yoffset * s->fixinfo.line_length;
+        }
+    }
+
+    for (int i = 0; i < disp_height; i++) {
+        memcpy(pout, pin, bytes_to_copy);
+        pout += s->fixinfo.line_length;
+        pin  += src_line_size;
+    }
+
+    return 0;
+}
+
+static av_cold int fbdev_write_trailer(AVFormatContext *h)
+{
+    FBDevContext *s = h->priv_data;
+    munmap(s->data, s->fixinfo.smem_len);
+    close(s->fd);
+    return 0;
+}
+
+#define OFFSET(x) offsetof(FBDevContext, x)
+#define ENC AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
+    { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
+    { NULL }
+};
+
+static const AVClass fbdev_class = {
+    .class_name = "fbdev outdev",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVOutputFormat ff_fbdev_muxer = {
+    .name           = "fbdev",
+    .long_name      = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
+    .priv_data_size = sizeof(FBDevContext),
+    .audio_codec    = AV_CODEC_ID_NONE,
+    .video_codec    = AV_CODEC_ID_RAWVIDEO,
+    .write_header   = fbdev_write_header,
+    .write_packet   = fbdev_write_packet,
+    .write_trailer  = fbdev_write_trailer,
+    .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
+    .priv_class     = &fbdev_class,
+};
diff --git a/libavdevice/version.h b/libavdevice/version.h
index 5823ab9..4f4ec99 100644
--- a/libavdevice/version.h
+++ b/libavdevice/version.h
@@ -28,7 +28,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVDEVICE_VERSION_MAJOR  55
-#define LIBAVDEVICE_VERSION_MINOR   4
+#define LIBAVDEVICE_VERSION_MINOR   5
 #define LIBAVDEVICE_VERSION_MICRO 100
 
 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
-- 
1.7.10.4



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