1 /* 2 * Copyright (C) 2014 Collabora Ltd. 3 * Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk> 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public 16 * License along with this library; if not, write to the 17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22 #ifndef __V4L2_UTILS_H__ 23 #define __V4L2_UTILS_H__ 24 25 #include <gst/gst.h> 26 27 G_BEGIN_DECLS 28 29 #define GST_V4L2_ERROR_INIT { NULL, NULL } 30 #define GST_V4L2_ERROR(v4l2err,domain,code,msg,dbg) \ 31 {\ 32 if (v4l2err) { \ 33 gchar *_msg = _gst_element_error_printf msg; \ 34 v4l2err->error = g_error_new_literal (GST_##domain##_ERROR, \ 35 GST_##domain##_ERROR_##code, _msg); \ 36 g_free (_msg); \ 37 v4l2err->dbg_message = _gst_element_error_printf dbg; \ 38 v4l2err->file = __FILE__; \ 39 v4l2err->func = GST_FUNCTION; \ 40 v4l2err->line = __LINE__; \ 41 } \ 42 } 43 44 /** 45 * GST_V4L2_IS_M2M: 46 * @_dcaps: The device capabilities 47 * 48 * Checks if the device caps represent an M2M device. Note that modern M2M 49 * devices uses V4L2_CAP_VIDEO_M2M* flag, but legacy uses to set both CAPTURE 50 * and OUTPUT flags instead. 51 * 52 * Returns: %TRUE if this is a M2M device. 53 */ 54 #define GST_V4L2_IS_M2M(_dcaps) \ 55 (((_dcaps) & (V4L2_CAP_VIDEO_M2M | V4L2_CAP_VIDEO_M2M_MPLANE)) ||\ 56 (((_dcaps) & \ 57 (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) && \ 58 ((_dcaps) & \ 59 (V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)))) 60 61 62 typedef struct _GstV4l2Iterator GstV4l2Iterator; 63 typedef struct _GstV4l2Error GstV4l2Error; 64 65 struct _GstV4l2Iterator 66 { 67 const gchar *device_path; 68 const gchar *device_name; 69 const gchar *sys_path; 70 }; 71 72 struct _GstV4l2Error 73 { 74 GError *error; 75 gchar *dbg_message; 76 const gchar *file; 77 const gchar *func; 78 gint line; 79 }; 80 81 GstV4l2Iterator * gst_v4l2_iterator_new (void); 82 gboolean gst_v4l2_iterator_next (GstV4l2Iterator *it); 83 void gst_v4l2_iterator_free (GstV4l2Iterator *it); 84 85 const gchar * gst_v4l2_iterator_get_device_path (GstV4l2Iterator *it); 86 const gchar * gst_v4l2_iterator_get_device_name (GstV4l2Iterator *it); 87 const gchar * gst_v4l2_iterator_get_sys_path (GstV4l2Iterator *it); 88 89 void gst_v4l2_clear_error (GstV4l2Error *error); 90 void gst_v4l2_error (gpointer element, GstV4l2Error *error); 91 92 G_END_DECLS 93 94 #endif /* __V4L2_UTILS_H__ */ 95 96 97