lavd: rename fbdev.c into fbdev_dec.c

Rename existing fbdev.c to make it a more meaningful name.

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

1 files changed, 263 insertions, 0 deletions

diff --git a/libavdevice/fbdev_dec.c b/libavdevice/fbdev_dec.c
new file mode 100644
index 0000000000..b49052ef6f
--- /dev/null
+++ b/libavdevice/fbdev_dec.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright (c) 2011 Stefano Sabatini
+ * Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com>
+ * Copyright (C) 2002 Gunnar Monell <gmo@linux.nu>
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Linux framebuffer input device,
+ * inspired by code from fbgrab.c by Gunnar Monell.
+ * @see http://linux-fbdev.sourceforge.net/
+ */
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <time.h>
+#include <linux/fb.h>
+
+#include "libavutil/internal.h"
+#include "libavutil/log.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+#include "libavutil/time.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "avdevice.h"
+#include "libavformat/internal.h"
+
+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;
+}
+
+typedef struct {
+    AVClass *class;          ///< class for private options
+    int frame_size;          ///< size in bytes of a grabbed frame
+    AVRational framerate_q;  ///< framerate
+    int64_t time_frame;      ///< time for the next frame to output (in 1/1000000 units)
+
+    int fd;                  ///< framebuffer device file descriptor
+    int width, height;       ///< assumed frame resolution
+    int frame_linesize;      ///< linesize of the output frame, it is assumed to be constant
+    int bytes_per_pixel;
+
+    struct fb_var_screeninfo varinfo; ///< variable info;
+    struct fb_fix_screeninfo fixinfo; ///< fixed    info;
+
+    uint8_t *data;           ///< framebuffer data
+} FBDevContext;
+
+static av_cold int fbdev_read_header(AVFormatContext *avctx)
+{
+    FBDevContext *fbdev = avctx->priv_data;
+    AVStream *st = NULL;
+    enum AVPixelFormat pix_fmt;
+    int ret, flags = O_RDONLY;
+
+    if (!(st = avformat_new_stream(avctx, NULL)))
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */
+
+    /* NONBLOCK is ignored by the fbdev driver, only set for consistency */
+    if (avctx->flags & AVFMT_FLAG_NONBLOCK)
+        flags |= O_NONBLOCK;
+
+    if ((fbdev->fd = avpriv_open(avctx->filename, flags)) == -1) {
+        ret = AVERROR(errno);
+        av_log(avctx, AV_LOG_ERROR,
+               "Could not open framebuffer device '%s': %s\n",
+               avctx->filename, av_err2str(ret));
+        return ret;
+    }
+
+    if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
+        ret = AVERROR(errno);
+        av_log(avctx, AV_LOG_ERROR,
+               "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
+        goto fail;
+    }
+
+    if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
+        ret = AVERROR(errno);
+        av_log(avctx, AV_LOG_ERROR,
+               "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
+        goto fail;
+    }
+
+    pix_fmt = get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
+    if (pix_fmt == AV_PIX_FMT_NONE) {
+        ret = AVERROR(EINVAL);
+        av_log(avctx, AV_LOG_ERROR,
+               "Framebuffer pixel format not supported.\n");
+        goto fail;
+    }
+
+    fbdev->width           = fbdev->varinfo.xres;
+    fbdev->height          = fbdev->varinfo.yres;
+    fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3;
+    fbdev->frame_linesize  = fbdev->width * fbdev->bytes_per_pixel;
+    fbdev->frame_size      = fbdev->frame_linesize * fbdev->height;
+    fbdev->time_frame      = AV_NOPTS_VALUE;
+    fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0);
+    if (fbdev->data == MAP_FAILED) {
+        ret = AVERROR(errno);
+        av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
+        goto fail;
+    }
+
+    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id   = AV_CODEC_ID_RAWVIDEO;
+    st->codec->width      = fbdev->width;
+    st->codec->height     = fbdev->height;
+    st->codec->pix_fmt    = pix_fmt;
+    st->codec->time_base  = av_inv_q(fbdev->framerate_q);
+    st->codec->bit_rate   =
+        fbdev->width * fbdev->height * fbdev->bytes_per_pixel * av_q2d(fbdev->framerate_q) * 8;
+
+    av_log(avctx, AV_LOG_INFO,
+           "w:%d h:%d bpp:%d pixfmt:%s fps:%d/%d bit_rate:%d\n",
+           fbdev->width, fbdev->height, fbdev->varinfo.bits_per_pixel,
+           av_get_pix_fmt_name(pix_fmt),
+           fbdev->framerate_q.num, fbdev->framerate_q.den,
+           st->codec->bit_rate);
+    return 0;
+
+fail:
+    close(fbdev->fd);
+    return ret;
+}
+
+static int fbdev_read_packet(AVFormatContext *avctx, AVPacket *pkt)
+{
+    FBDevContext *fbdev = avctx->priv_data;
+    int64_t curtime, delay;
+    struct timespec ts;
+    int i, ret;
+    uint8_t *pin, *pout;
+
+    if (fbdev->time_frame == AV_NOPTS_VALUE)
+        fbdev->time_frame = av_gettime();
+
+    /* wait based on the frame rate */
+    while (1) {
+        curtime = av_gettime();
+        delay = fbdev->time_frame - curtime;
+        av_dlog(avctx,
+                "time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n",
+                fbdev->time_frame, curtime, delay);
+        if (delay <= 0) {
+            fbdev->time_frame += INT64_C(1000000) / av_q2d(fbdev->framerate_q);
+            break;
+        }
+        if (avctx->flags & AVFMT_FLAG_NONBLOCK)
+            return AVERROR(EAGAIN);
+        ts.tv_sec  =  delay / 1000000;
+        ts.tv_nsec = (delay % 1000000) * 1000;
+        while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
+    }
+
+    if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0)
+        return ret;
+
+    /* refresh fbdev->varinfo, visible data position may change at each call */
+    if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
+        av_log(avctx, AV_LOG_WARNING,
+               "Error refreshing variable info: %s\n", av_err2str(ret));
+
+    pkt->pts = curtime;
+
+    /* compute visible data offset */
+    pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset +
+                        fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
+    pout = pkt->data;
+
+    for (i = 0; i < fbdev->height; i++) {
+        memcpy(pout, pin, fbdev->frame_linesize);
+        pin  += fbdev->fixinfo.line_length;
+        pout += fbdev->frame_linesize;
+    }
+
+    return fbdev->frame_size;
+}
+
+static av_cold int fbdev_read_close(AVFormatContext *avctx)
+{
+    FBDevContext *fbdev = avctx->priv_data;
+
+    munmap(fbdev->data, fbdev->fixinfo.smem_len);
+    close(fbdev->fd);
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(FBDevContext, x)
+#define DEC AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+    { "framerate","", OFFSET(framerate_q), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
+    { NULL },
+};
+
+static const AVClass fbdev_class = {
+    .class_name = "fbdev indev",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_fbdev_demuxer = {
+    .name           = "fbdev",
+    .long_name      = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
+    .priv_data_size = sizeof(FBDevContext),
+    .read_header    = fbdev_read_header,
+    .read_packet    = fbdev_read_packet,
+    .read_close     = fbdev_read_close,
+    .flags          = AVFMT_NOFILE,
+    .priv_class     = &fbdev_class,
+};