/* G-Streamer Video4linux2 video-capture plugin * Copyright (C) 2002 Ronald Bultje * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include "v4l2src_calls.h" static GstElementDetails gst_v4l2src_details = { "Video (video4linux2) Source", "Source/Video", "Reads frames (compressed or uncompressed) from a video4linux2 device", VERSION, "Ronald Bultje ", "(C) 2002", }; /* V4l2Src signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; /* arguments */ enum { ARG_0, ARG_WIDTH, ARG_HEIGHT, ARG_PALETTE, ARG_PALETTE_NAMES, ARG_FOURCC, ARG_FOURCC_LIST, ARG_NUMBUFS, ARG_BUFSIZE }; /* init functions */ static void gst_v4l2src_class_init (GstV4l2SrcClass *klass); static void gst_v4l2src_init (GstV4l2Src *v4l2src); /* pad/buffer functions */ static GstPadConnectReturn gst_v4l2src_srcconnect (GstPad *pad, GstCaps *caps); static GstBuffer * gst_v4l2src_get (GstPad *pad); /* get/set params */ static void gst_v4l2src_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gst_v4l2src_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); /* state handling */ static GstElementStateReturn gst_v4l2src_change_state (GstElement *element); /* bufferpool functions */ static GstBuffer * gst_v4l2src_buffer_new (GstBufferPool *pool, guint64 offset, guint size, gpointer user_data); static GstBuffer * gst_v4l2src_buffer_copy (GstBufferPool *pool, const GstBuffer *srcbuf, gpointer user_data); static void gst_v4l2src_buffer_free (GstBufferPool *pool, GstBuffer *buf, gpointer user_data); static GstPadTemplate *src_template; static GstElementClass *parent_class = NULL; /*static guint gst_v4l2src_signals[LAST_SIGNAL] = { 0 }; */ GType gst_v4l2src_get_type (void) { static GType v4l2src_type = 0; if (!v4l2src_type) { static const GTypeInfo v4l2src_info = { sizeof(GstV4l2SrcClass), NULL, NULL, (GClassInitFunc) gst_v4l2src_class_init, NULL, NULL, sizeof(GstV4l2Src), 0, (GInstanceInitFunc) gst_v4l2src_init, NULL }; v4l2src_type = g_type_register_static(GST_TYPE_V4L2ELEMENT, "GstV4l2Src", &v4l2src_info, 0); } return v4l2src_type; } static void gst_v4l2src_class_init (GstV4l2SrcClass *klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass*)klass; gstelement_class = (GstElementClass*)klass; parent_class = g_type_class_ref(GST_TYPE_V4L2ELEMENT); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_WIDTH, g_param_spec_int("width","width","width", G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_HEIGHT, g_param_spec_int("height","height","height", G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_PALETTE, g_param_spec_int("palette","palette","palette", G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_PALETTE_NAMES, g_param_spec_pointer("palette_name","palette_name","palette_name", G_PARAM_READABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FOURCC, g_param_spec_string("fourcc","fourcc","fourcc", NULL,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FOURCC_LIST, g_param_spec_pointer("fourcc_list","fourcc_list","fourcc_list", G_PARAM_READABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NUMBUFS, g_param_spec_int("num_buffers","num_buffers","num_buffers", G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BUFSIZE, g_param_spec_int("buffer_size","buffer_size","buffer_size", G_MININT,G_MAXINT,0,G_PARAM_READABLE)); gobject_class->set_property = gst_v4l2src_set_property; gobject_class->get_property = gst_v4l2src_get_property; gstelement_class->change_state = gst_v4l2src_change_state; } static void gst_v4l2src_init (GstV4l2Src *v4l2src) { v4l2src->srcpad = gst_pad_new_from_template(src_template, "src"); gst_element_add_pad(GST_ELEMENT(v4l2src), v4l2src->srcpad); gst_pad_set_get_function(v4l2src->srcpad, gst_v4l2src_get); gst_pad_set_connect_function(v4l2src->srcpad, gst_v4l2src_srcconnect); v4l2src->bufferpool = gst_buffer_pool_new(NULL, NULL, gst_v4l2src_buffer_new, gst_v4l2src_buffer_copy, gst_v4l2src_buffer_free, v4l2src); v4l2src->palette = 0; /* means 'any' - user can specify a specific palette */ v4l2src->width = 160; v4l2src->height = 120; v4l2src->breq.count = 0; } static GstCaps * gst_v4l2src_v4l2fourcc_to_caps (guint32 fourcc, gint width, gint height, gboolean compressed) { GstCaps *capslist = NULL, *caps; switch (fourcc) { case V4L2_PIX_FMT_MJPEG: /* v4l2_fourcc('M','J','P','G') */ caps = gst_caps_new("v4l2src_caps", "video/jpeg", gst_props_new( "width", GST_PROPS_INT(width), "height", GST_PROPS_INT(height), NULL)); capslist = gst_caps_append(capslist, caps); break; case V4L2_PIX_FMT_RGB332: case V4L2_PIX_FMT_RGB555: case V4L2_PIX_FMT_RGB555X: case V4L2_PIX_FMT_RGB565: case V4L2_PIX_FMT_RGB565X: case V4L2_PIX_FMT_RGB24: case V4L2_PIX_FMT_BGR24: case V4L2_PIX_FMT_RGB32: case V4L2_PIX_FMT_BGR32: { guint depth=0, bpp=0; gint endianness=0; gulong r_mask=0, b_mask=0, g_mask=0; switch (fourcc) { case V4L2_PIX_FMT_RGB332: bpp = depth = 8; endianness = G_BYTE_ORDER; /* 'like, whatever' */ r_mask = 0xe0; g_mask = 0x1c; b_mask = 0x03; break; case V4L2_PIX_FMT_RGB555: bpp = 16; depth = 15; endianness = G_LITTLE_ENDIAN; r_mask = 0x7c00; g_mask = 0x03e0; b_mask = 0x001f; break; case V4L2_PIX_FMT_RGB555X: bpp = 16; depth = 15; endianness = G_BIG_ENDIAN; r_mask = 0x7c00; g_mask = 0x03e0; b_mask = 0x001f; break; case V4L2_PIX_FMT_RGB565: bpp = depth = 16; endianness = G_LITTLE_ENDIAN; r_mask = 0xf800; g_mask = 0x07e0; b_mask = 0x001f; break; case V4L2_PIX_FMT_RGB565X: bpp = depth = 16; endianness = G_BIG_ENDIAN; r_mask = 0xf800; g_mask = 0x07e0; b_mask = 0x001f; break; case V4L2_PIX_FMT_RGB24: bpp = depth = 24; endianness = G_BIG_ENDIAN; r_mask = 0xff0000; g_mask = 0x00ff00; b_mask = 0x0000ff; break; case V4L2_PIX_FMT_BGR24: bpp = depth = 24; endianness = G_LITTLE_ENDIAN; r_mask = 0xff0000; g_mask = 0x00ff00; b_mask = 0x0000ff; break; case V4L2_PIX_FMT_RGB32: bpp = depth = 32; endianness = G_BIG_ENDIAN; r_mask = 0x00ff0000; g_mask = 0x0000ff00; b_mask = 0x000000ff; break; case V4L2_PIX_FMT_BGR32: endianness = G_LITTLE_ENDIAN; bpp = depth = 32; r_mask = 0x00ff0000; g_mask = 0x0000ff00; b_mask = 0x000000ff; break; } caps = gst_caps_new("v4l2src_caps", "video/raw", gst_props_new( "format", GST_PROPS_FOURCC(GST_MAKE_FOURCC('R','G','B',' ')), "width", GST_PROPS_INT(width), "height", GST_PROPS_INT(height), "bpp", GST_PROPS_INT(bpp), "depth", GST_PROPS_INT(depth), "red_mask", GST_PROPS_INT(r_mask), "green_mask", GST_PROPS_INT(g_mask), "blue_mask", GST_PROPS_INT(b_mask), "endianness", GST_PROPS_INT(endianness), NULL)); capslist = gst_caps_append(capslist, caps); break; } case V4L2_PIX_FMT_YUV420: /* I420/IYUV */ caps = gst_caps_new("v4l2src_caps", "video/raw", gst_props_new( "format", GST_PROPS_FOURCC(GST_MAKE_FOURCC('I','4','2','0')), "width", GST_PROPS_INT(width), "height", GST_PROPS_INT(height), NULL)); capslist = gst_caps_append(capslist, caps); caps = gst_caps_new("v4l2src_caps", "video/raw", gst_props_new( "format", GST_PROPS_FOURCC(GST_MAKE_FOURCC('I','Y','U','V')), "width", GST_PROPS_INT(width), "height", GST_PROPS_INT(height), NULL)); capslist = gst_caps_append(capslist, caps); break; case V4L2_PIX_FMT_YUYV: caps = gst_caps_new("v4l2src_caps", "video/raw", gst_props_new( "format", GST_PROPS_FOURCC(GST_MAKE_FOURCC('Y','U','Y','2')), "width", GST_PROPS_INT(width), "height", GST_PROPS_INT(height), NULL)); capslist = gst_caps_append(capslist, caps); break; default: break; } /* add the standard one */ if (compressed) { guint32 print_format = GUINT32_FROM_LE(fourcc); gchar *print_format_str = (gchar *) &print_format, *string_format; gint i; for (i=0;i<4;i++) print_format_str[i] = g_ascii_tolower(print_format_str[i]); string_format = g_strdup_printf("video/%4.4s", print_format_str); caps = gst_caps_new("v4l2src_caps", string_format, gst_props_new( "width", GST_PROPS_INT(width), "height", GST_PROPS_INT(height), NULL)); capslist = gst_caps_append(capslist, caps); g_free(string_format); } else { caps = gst_caps_new("v4l2src_caps", "video/raw", gst_props_new( "format", GST_PROPS_FOURCC(fourcc), "width", GST_PROPS_INT(width), "height", GST_PROPS_INT(height), NULL)); capslist = gst_caps_append(capslist, caps); } return capslist; } static GList * gst_v4l2_caps_to_v4l2fourcc (GstV4l2Src *v4l2src, GstCaps *capslist) { GList *fourcclist = NULL; GstCaps *caps; guint32 fourcc; gint i; for (caps = capslist;caps != NULL; caps = caps->next) { const gchar *format = gst_caps_get_mime(caps); if (!strcmp(format, "video/raw")) { /* non-compressed */ gst_caps_get_fourcc_int(caps, "format", &fourcc); switch (fourcc) { case GST_MAKE_FOURCC('I','4','2','0'): case GST_MAKE_FOURCC('I','Y','U','V'): fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_YUV420); break; case GST_MAKE_FOURCC('Y','U','Y','2'): fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_YUYV); break; case GST_MAKE_FOURCC('R','G','B',' '): { gint depth, endianness; gst_caps_get_int(caps, "depth", &depth); gst_caps_get_int(caps, "endianness", &endianness); if (depth == 8) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_RGB332); } else if (depth == 15 && endianness == G_LITTLE_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_RGB555); } else if (depth == 15 && endianness == G_BIG_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_RGB555X); } else if (depth == 16 && endianness == G_LITTLE_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_RGB565); } else if (depth == 16 && endianness == G_BIG_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_RGB565X); } else if (depth == 24 && endianness == G_LITTLE_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_BGR24); } else if (depth == 24 && endianness == G_BIG_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_RGB24); } else if (depth == 32 && endianness == G_LITTLE_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_BGR32); } else if (depth == 32 && endianness == G_BIG_ENDIAN) { fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_RGB32); } break; } } for (i=0;iformats);i++) { struct v4l2_fmtdesc *fmt = (struct v4l2_fmtdesc *) g_list_nth_data(GST_V4L2ELEMENT(v4l2src)->formats, i); if (fmt->pixelformat == fourcc) fourcclist = g_list_append(fourcclist, (gpointer)fourcc); } } else { /* compressed */ gchar *format_us; gint i; if (strncmp(format, "video/", 6)) continue; format = &format[6]; if (strlen(format) != 4) continue; format_us = g_strdup(format); for (i=0;i<4;i++) format_us[i] = g_ascii_toupper(format_us[i]); fourcc = GST_MAKE_FOURCC(format_us[0],format_us[1],format_us[2],format_us[3]); switch (fourcc) { case GST_MAKE_FOURCC('J','P','E','G'): fourcclist = g_list_append(fourcclist, (gpointer)V4L2_PIX_FMT_MJPEG); break; } fourcclist = g_list_append(fourcclist, (gpointer)fourcc); } } return fourcclist; } static GstCaps * gst_v4l2src_caps_intersect (GstCaps *caps1, GstCaps *_caps2) { GstCaps *_list = NULL; if (!_caps2) return caps1; for (;caps1!=NULL;caps1=caps1->next) { GstCaps *caps2 = _caps2; for (;caps2!=NULL;caps2=caps2->next) { if (!strcmp(gst_caps_get_mime(caps1), gst_caps_get_mime(caps2))) { if (!strcmp(gst_caps_get_mime(caps1), "video/raw")) { guint32 fmt1, fmt2; gst_caps_get_fourcc_int(caps1, "format", &fmt1); gst_caps_get_fourcc_int(caps2, "format", &fmt2); if (fmt1 == fmt2) goto try_it_out; } else if (!strncmp(gst_caps_get_mime(caps1), "video/", 6)) { goto try_it_out; } continue; } continue; try_it_out: if (!strcmp(gst_caps_get_mime(caps1), "video/raw")) { GstCaps *list = _list; for (;list!=NULL;list=list->next) { if (!strcmp(gst_caps_get_mime(list), gst_caps_get_mime(caps1))) { guint32 fmt1, fmt2; gst_caps_get_fourcc_int(caps1, "format", &fmt1); gst_caps_get_fourcc_int(list, "format", &fmt2); if (fmt1 == fmt2) break; } } if (list == NULL) goto add_it; } else { GstCaps *list = _list; for (;list!=NULL;list=list->next) { if (!strcmp(gst_caps_get_mime(list), gst_caps_get_mime(caps1))) { break; } } if (list == NULL) goto add_it; } continue; add_it: _list = gst_caps_append(_list, gst_caps_copy_1(caps1)); break; } } return _list; } static GstPadConnectReturn gst_v4l2src_srcconnect (GstPad *pad, GstCaps *vscapslist) { GstV4l2Src *v4l2src; GstV4l2Element *v4l2element; GstCaps *owncapslist; GstCaps *caps; GList *fourccs; gint i; v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad)); v4l2element = GST_V4L2ELEMENT(v4l2src); /* clean up if we still haven't cleaned up our previous * capture session */ if (GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) if (!gst_v4l2src_capture_deinit(v4l2src)) return GST_PAD_CONNECT_REFUSED; /* build our own capslist */ if (v4l2src->palette) { struct v4l2_fmtdesc *format = g_list_nth_data(v4l2element->formats, v4l2src->palette); owncapslist = gst_v4l2src_v4l2fourcc_to_caps(format->pixelformat, v4l2src->width, v4l2src->height, format->flags & V4L2_FMT_FLAG_COMPRESSED); } else { gint i; owncapslist = NULL; for (i=0;iformats);i++) { struct v4l2_fmtdesc *format = g_list_nth_data(v4l2element->formats, i); caps = gst_v4l2src_v4l2fourcc_to_caps(format->pixelformat, v4l2src->width, v4l2src->height, format->flags & V4L2_FMT_FLAG_COMPRESSED); owncapslist = gst_caps_append(owncapslist, caps); } } /* and now, get the caps that we have in common */ if (!(caps = gst_v4l2src_caps_intersect(owncapslist, vscapslist))) return GST_PAD_CONNECT_REFUSED; /* and get them back to V4L2-compatible fourcc codes */ if (!(fourccs = gst_v4l2_caps_to_v4l2fourcc(v4l2src, caps))) return GST_PAD_CONNECT_REFUSED; /* we now have the fourcc codes. try out each of them */ for (i=0;iformats);n++) { struct v4l2_fmtdesc *format = g_list_nth_data(v4l2element->formats, n); if (format->pixelformat == fourcc) { /* we found the pixelformat! - try it out */ if (gst_v4l2src_set_capture(v4l2src, format, v4l2src->width, v4l2src->height)) { /* it fits! Now, get the proper counterpart and retry * it on the other side (again...) - if it works, we're * done -> GST_PAD_CONNECT_OK */ GstCaps *lastcaps = gst_v4l2src_v4l2fourcc_to_caps(format->pixelformat, v4l2src->format.fmt.pix.width, v4l2src->format.fmt.pix.height, format->flags & V4L2_FMT_FLAG_COMPRESSED); GstCaps *onecaps; for (;lastcaps != NULL; lastcaps = lastcaps->next) { onecaps = gst_caps_copy_1(lastcaps); if (gst_pad_try_set_caps(v4l2src->srcpad, onecaps) > 0) if (gst_v4l2src_capture_init(v4l2src)) return GST_PAD_CONNECT_OK; } } } } } return GST_PAD_CONNECT_REFUSED; } static GstBuffer* gst_v4l2src_get (GstPad *pad) { GstV4l2Src *v4l2src; GstBuffer *buf; gint num; g_return_val_if_fail (pad != NULL, NULL); v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad)); buf = gst_buffer_new_from_pool(v4l2src->bufferpool, 0, 0); if (!buf) { gst_element_error(GST_ELEMENT(v4l2src), "Failed to create a new GstBuffer"); return NULL; } /* grab a frame from the device */ if (!gst_v4l2src_grab_frame(v4l2src, &num)) return NULL; GST_BUFFER_DATA(buf) = GST_V4L2ELEMENT(v4l2src)->buffer[num]; GST_BUFFER_SIZE(buf) = v4l2src->bufsettings.bytesused; GST_BUFFER_MAXSIZE(buf) = v4l2src->bufsettings.length; if (!v4l2src->first_timestamp) v4l2src->first_timestamp = v4l2src->bufsettings.timestamp; GST_BUFFER_TIMESTAMP(buf) = v4l2src->bufsettings.length - v4l2src->first_timestamp; return buf; } static void gst_v4l2src_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GstV4l2Src *v4l2src; g_return_if_fail(GST_IS_V4L2SRC(object)); v4l2src = GST_V4L2SRC(object); switch (prop_id) { case ARG_WIDTH: if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) { v4l2src->width = g_value_get_int(value); } break; case ARG_HEIGHT: if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) { v4l2src->height = g_value_get_int(value); } break; case ARG_PALETTE: if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) { v4l2src->palette = g_value_get_int(value); } break; case ARG_FOURCC: if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) { gint i; const gchar *formatstr = g_value_get_string(value); guint32 fourcc = GST_MAKE_FOURCC(formatstr[0],formatstr[1],formatstr[2],formatstr[3]); for (i=0;iformats);i++) { struct v4l2_fmtdesc *fmt = (struct v4l2_fmtdesc *) g_list_nth_data(GST_V4L2ELEMENT(v4l2src)->formats, i); if (fmt->pixelformat == fourcc) v4l2src->palette = i; } } break; case ARG_NUMBUFS: if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) { v4l2src->breq.count = g_value_get_int(value); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_v4l2src_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GstV4l2Src *v4l2src; g_return_if_fail(GST_IS_V4L2SRC(object)); v4l2src = GST_V4L2SRC(object); switch (prop_id) { case ARG_WIDTH: g_value_set_int(value, v4l2src->width); break; case ARG_HEIGHT: g_value_set_int(value, v4l2src->height); break; case ARG_PALETTE: g_value_set_int(value, v4l2src->palette); break; case ARG_PALETTE_NAMES: g_value_set_pointer(value, gst_v4l2src_get_format_list(v4l2src)); break; case ARG_FOURCC: { struct v4l2_fmtdesc *fmt = g_list_nth_data(GST_V4L2ELEMENT(v4l2src)->formats, v4l2src->palette); guint32 print_format = GUINT32_FROM_LE(fmt->pixelformat); gchar *print_format_str = (gchar *) &print_format; g_value_set_string(value, g_strndup(print_format_str, 4)); break; } case ARG_FOURCC_LIST: g_value_set_pointer(value, gst_v4l2src_get_fourcc_list(v4l2src)); break; case ARG_NUMBUFS: g_value_set_int(value, v4l2src->breq.count); break; case ARG_BUFSIZE: g_value_set_int(value, v4l2src->format.fmt.pix.sizeimage); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstElementStateReturn gst_v4l2src_change_state (GstElement *element) { GstV4l2Src *v4l2src; gint transition = GST_STATE_TRANSITION (element); GstElementStateReturn parent_return; g_return_val_if_fail(GST_IS_V4L2SRC(element), GST_STATE_FAILURE); v4l2src = GST_V4L2SRC(element); if (GST_ELEMENT_CLASS (parent_class)->change_state) { parent_return = GST_ELEMENT_CLASS (parent_class)->change_state (element); if (parent_return != GST_STATE_SUCCESS) return parent_return; } switch (transition) { case GST_STATE_NULL_TO_READY: if (!gst_v4l2src_get_capture(v4l2src)) return GST_STATE_FAILURE; break; case GST_STATE_READY_TO_PAUSED: v4l2src->first_timestamp = 0; /* buffer setup moved to capsnego */ break; case GST_STATE_PAUSED_TO_PLAYING: /* queue all buffer, start streaming capture */ if (!gst_v4l2src_capture_start(v4l2src)) return GST_STATE_FAILURE; break; case GST_STATE_PLAYING_TO_PAUSED: /* de-queue all queued buffers */ if (!gst_v4l2src_capture_stop(v4l2src)) return GST_STATE_FAILURE; break; case GST_STATE_PAUSED_TO_READY: /* stop capturing, unmap all buffers */ if (!gst_v4l2src_capture_deinit(v4l2src)) return GST_STATE_FAILURE; break; case GST_STATE_READY_TO_NULL: break; } return GST_STATE_SUCCESS; } static GstBuffer* gst_v4l2src_buffer_new (GstBufferPool *pool, guint64 offset, guint size, gpointer user_data) { GstBuffer *buffer; buffer = gst_buffer_new(); if (!buffer) return NULL; /* TODO: add interlacing info to buffer as metadata (height>288 or 240 = topfieldfirst, else noninterlaced) */ return buffer; } static GstBuffer* gst_v4l2src_buffer_copy (GstBufferPool *pool, const GstBuffer *srcbuf, gpointer user_data) { GstBuffer *buffer; buffer = gst_buffer_new(); if (!buffer) return NULL; GST_BUFFER_DATA(buffer) = g_malloc(GST_BUFFER_SIZE(srcbuf)); if (!GST_BUFFER_DATA(buffer)) return NULL; GST_BUFFER_MAXSIZE(buffer) = GST_BUFFER_SIZE(srcbuf); GST_BUFFER_SIZE(buffer) = GST_BUFFER_SIZE(srcbuf); memcpy(GST_BUFFER_DATA(buffer), GST_BUFFER_DATA(srcbuf), GST_BUFFER_SIZE(srcbuf)); GST_BUFFER_TIMESTAMP(buffer) = GST_BUFFER_TIMESTAMP(srcbuf); return buffer; } static void gst_v4l2src_buffer_free (GstBufferPool *pool, GstBuffer *buf, gpointer user_data) { GstV4l2Src *v4l2src = GST_V4L2SRC(user_data); int n; for (n=0;nbreq.count;n++) if (GST_BUFFER_DATA(buf) == GST_V4L2ELEMENT(v4l2src)->buffer[n]) { gst_v4l2src_requeue_frame(v4l2src, n); return; } gst_element_error(GST_ELEMENT(v4l2src), "Couldn\'t find the buffer"); } static gboolean plugin_init (GModule *module, GstPlugin *plugin) { GstElementFactory *factory; /* create an elementfactory for the v4l2src */ factory = gst_element_factory_new("v4l2src", GST_TYPE_V4L2SRC, &gst_v4l2src_details); g_return_val_if_fail(factory != NULL, FALSE); src_template = gst_pad_template_new("src", GST_PAD_SRC, GST_PAD_ALWAYS, NULL); gst_element_factory_add_pad_template(factory, src_template); gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE(factory)); return TRUE; } GstPluginDesc plugin_desc = { GST_VERSION_MAJOR, GST_VERSION_MINOR, "v4l2src", plugin_init };