v4l2: factorize returning error codes.

[ffmpeg] / libavdevice / v4l.c

diff --git a/libavdevice/v4l.c b/libavdevice/v4l.c
index d0ef7d5e047d1332fa365f3a6da4194084244b30..1be7adf49d920ad3a480b7080badd6717525b3b9 100644 (file)
--- a/libavdevice/v4l.c
+++ b/libavdevice/v4l.c
@@ -2,26 +2,33 @@
  * Linux video grab interface
  * Copyright (c) 2000,2001 Fabrice Bellard
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "avdevice.h"
+
+#if FF_API_V4L
+
 #undef __STRICT_ANSI__ //workaround due to broken kernel headers
 #include "config.h"
 #include "libavutil/rational.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
 #include "libavformat/avformat.h"
 #include "libavcodec/dsputil.h"
 #include <unistd.h>
@@ -35,6 +42,7 @@
 #include <strings.h>
 
 typedef struct {
+    AVClass *class;
     int fd;
     int frame_format; /* see VIDEO_PALETTE_xxx */
     int use_mmap;
@@ -48,6 +56,7 @@ typedef struct {
     struct video_mbuf gb_buffers;
     struct video_mmap gb_buf;
     int gb_frame;
+    int standard;
 } VideoData;
 
 static const struct {
@@ -78,6 +87,8 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
     int j;
     int vformat_num = FF_ARRAY_ELEMS(video_formats);
 
+    av_log(s1, AV_LOG_WARNING, "V4L input device is deprecated and will be removed in the next release.");
+
     if (ap->time_base.den <= 0) {
         av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
         return -1;
@@ -116,7 +127,7 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
         }
     }
 
-    if(avcodec_check_dimensions(s1, s->video_win.width, s->video_win.height) < 0)
+    if(av_image_check_size(s->video_win.width, s->video_win.height, 0, s1) < 0)
         return -1;
 
     desired_palette = -1;
@@ -130,13 +141,18 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
     }
 
     /* set tv standard */
-    if (ap->standard && !ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
-        if (!strcasecmp(ap->standard, "pal"))
-            tuner.mode = VIDEO_MODE_PAL;
-        else if (!strcasecmp(ap->standard, "secam"))
-            tuner.mode = VIDEO_MODE_SECAM;
-        else
-            tuner.mode = VIDEO_MODE_NTSC;
+    if (!ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
+#if FF_API_FORMAT_PARAMETERS
+        if (ap->standard) {
+            if (!strcasecmp(ap->standard, "pal"))
+                s->standard = VIDEO_MODE_PAL;
+            else if (!strcasecmp(ap->standard, "secam"))
+                s->standard = VIDEO_MODE_SECAM;
+            else
+                s->standard = VIDEO_MODE_NTSC;
+        }
+#endif
+        tuner.mode = s->standard;
         ioctl(video_fd, VIDIOCSTUNER, &tuner);
     }
 
@@ -148,14 +164,8 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
     ioctl(video_fd, VIDIOCSAUDIO, &audio);
 
     ioctl(video_fd, VIDIOCGPICT, &pict);
-#if 0
-    printf("v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
-           pict.colour,
-           pict.hue,
-           pict.brightness,
-           pict.contrast,
-           pict.whiteness);
-#endif
+    av_dlog(s1, "v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
+            pict.colour, pict.hue, pict.brightness, pict.contrast, pict.whiteness);
     /* try to choose a suitable video format */
     pict.palette = desired_palette;
     pict.depth= desired_depth;
@@ -338,7 +348,22 @@ static int grab_read_close(AVFormatContext *s1)
     return 0;
 }
 
-AVInputFormat v4l_demuxer = {
+static const AVOption options[] = {
+    { "standard", "", offsetof(VideoData, standard), FF_OPT_TYPE_INT, {.dbl = VIDEO_MODE_NTSC}, VIDEO_MODE_PAL, VIDEO_MODE_NTSC, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+    { "PAL",   "", 0, FF_OPT_TYPE_CONST, {.dbl = VIDEO_MODE_PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+    { "SECAM", "", 0, FF_OPT_TYPE_CONST, {.dbl = VIDEO_MODE_SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+    { "NTSC",  "", 0, FF_OPT_TYPE_CONST, {.dbl = VIDEO_MODE_NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+    { NULL },
+};
+
+static const AVClass v4l_class = {
+    .class_name = "V4L indev",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_v4l_demuxer = {
     "video4linux",
     NULL_IF_CONFIG_SMALL("Video4Linux device grab"),
     sizeof(VideoData),
@@ -347,4 +372,6 @@ AVInputFormat v4l_demuxer = {
     grab_read_packet,
     grab_read_close,
     .flags = AVFMT_NOFILE,
+    .priv_class = &v4l_class,
 };
+#endif  /* FF_API_V4L */