/* G-Streamer hardware MJPEG video source plugin * Copyright (C) 2001-2002 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. */ #ifdef HAVE_CONFIG_H #include #endif #include #include "v4lmjpegsrc_calls.h" /* elementfactory information */ static GstElementDetails gst_v4lmjpegsrc_details = { "Video (video4linux/MJPEG) Source", "Source/Video", "Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device", "Ronald Bultje " }; /* V4lMjpegSrc signals and args */ enum { SIGNAL_FRAME_CAPTURE, SIGNAL_FRAME_DROP, SIGNAL_FRAME_INSERT, SIGNAL_FRAME_LOST, LAST_SIGNAL }; /* arguments */ enum { ARG_0, #if 0 ARG_X_OFFSET, ARG_Y_OFFSET, ARG_F_WIDTH, ARG_F_HEIGHT, /* normally, we would want to use subframe capture, however, * for the time being it's easier if we disable it first */ #endif ARG_QUALITY, ARG_NUMBUFS, ARG_BUFSIZE, ARG_USE_FIXED_FPS }; GST_FORMATS_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_formats, GST_FORMAT_TIME, GST_FORMAT_DEFAULT); GST_QUERY_TYPE_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_query_types, GST_QUERY_POSITION); /* init functions */ static void gst_v4lmjpegsrc_base_init (gpointer g_class); static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass *klass); static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc *v4lmjpegsrc); /* pad/info functions */ static gboolean gst_v4lmjpegsrc_src_convert (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value); static gboolean gst_v4lmjpegsrc_src_query (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value); /* buffer functions */ static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad *pad, const GstCaps *caps); static GstData* gst_v4lmjpegsrc_get (GstPad *pad); static GstCaps* gst_v4lmjpegsrc_getcaps (GstPad *pad); /* get/set params */ static void gst_v4lmjpegsrc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gst_v4lmjpegsrc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); /* set_clock function for A/V sync */ static void gst_v4lmjpegsrc_set_clock (GstElement *element, GstClock *clock); /* state handling */ static GstElementStateReturn gst_v4lmjpegsrc_change_state (GstElement *element); /* requeue buffer after use */ static void gst_v4lmjpegsrc_buffer_free (GstBuffer *buffer); static GstElementClass *parent_class = NULL; static guint gst_v4lmjpegsrc_signals[LAST_SIGNAL] = { 0 }; GType gst_v4lmjpegsrc_get_type (void) { static GType v4lmjpegsrc_type = 0; if (!v4lmjpegsrc_type) { static const GTypeInfo v4lmjpegsrc_info = { sizeof(GstV4lMjpegSrcClass), gst_v4lmjpegsrc_base_init, NULL, (GClassInitFunc)gst_v4lmjpegsrc_class_init, NULL, NULL, sizeof(GstV4lMjpegSrc), 0, (GInstanceInitFunc)gst_v4lmjpegsrc_init, NULL }; v4lmjpegsrc_type = g_type_register_static(GST_TYPE_V4LELEMENT, "GstV4lMjpegSrc", &v4lmjpegsrc_info, 0); } return v4lmjpegsrc_type; } static void gst_v4lmjpegsrc_base_init (gpointer g_class) { static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ( "src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-jpeg, " "width = (int) [ 0, MAX ], " "height = (int) [ 0, MAX ], " "framerate = (double) [ 0, MAX ]" ) ); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details (gstelement_class, &gst_v4lmjpegsrc_details); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&src_template)); } static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass *klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass*)klass; gstelement_class = (GstElementClass*)klass; parent_class = g_type_class_ref(GST_TYPE_V4LELEMENT); #if 0 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_X_OFFSET, g_param_spec_int("x_offset","x_offset","x_offset", G_MININT,G_MAXINT,0,G_PARAM_WRITABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_Y_OFFSET, g_param_spec_int("y_offset","y_offset","y_offset", G_MININT,G_MAXINT,0,G_PARAM_WRITABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_F_WIDTH, g_param_spec_int("frame_width","frame_width","frame_width", G_MININT,G_MAXINT,0,G_PARAM_WRITABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_F_HEIGHT, g_param_spec_int("frame_height","frame_height","frame_height", G_MININT,G_MAXINT,0,G_PARAM_WRITABLE)); #endif g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_QUALITY, g_param_spec_int("quality","Quality","JPEG frame quality", 1,100,50,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NUMBUFS, g_param_spec_int("num_buffers","Num Buffers","Number of Buffers", 1,256,64,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BUFSIZE, g_param_spec_int("buffer_size", "Buffer Size", "Size of buffers", 0, 512*1024, 128*1024, G_PARAM_READABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_USE_FIXED_FPS, g_param_spec_boolean("use_fixed_fps", "Use Fixed FPS", "Drop/Insert frames to reach a certain FPS (TRUE) " "or adapt FPS to suit the number of frabbed frames", TRUE, G_PARAM_READWRITE)); /* signals */ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE] = g_signal_new("frame_capture", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET(GstV4lMjpegSrcClass, frame_capture), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP] = g_signal_new("frame_drop", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET(GstV4lMjpegSrcClass, frame_drop), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT] = g_signal_new("frame_insert", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET(GstV4lMjpegSrcClass, frame_insert), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST] = g_signal_new("frame_lost", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET(GstV4lMjpegSrcClass, frame_lost), NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT); gobject_class->set_property = gst_v4lmjpegsrc_set_property; gobject_class->get_property = gst_v4lmjpegsrc_get_property; gstelement_class->change_state = gst_v4lmjpegsrc_change_state; gstelement_class->set_clock = gst_v4lmjpegsrc_set_clock; } static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc *v4lmjpegsrc) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (v4lmjpegsrc); GST_FLAG_SET(GST_ELEMENT(v4lmjpegsrc), GST_ELEMENT_THREAD_SUGGESTED); v4lmjpegsrc->srcpad = gst_pad_new_from_template ( gst_element_class_get_pad_template (klass, "src"), "src"); gst_element_add_pad(GST_ELEMENT(v4lmjpegsrc), v4lmjpegsrc->srcpad); gst_pad_set_get_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get); gst_pad_set_getcaps_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_getcaps); gst_pad_set_link_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_srcconnect); gst_pad_set_convert_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_src_convert); gst_pad_set_formats_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get_formats); gst_pad_set_query_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_src_query); gst_pad_set_query_type_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get_query_types); #if 0 v4lmjpegsrc->frame_width = 0; v4lmjpegsrc->frame_height = 0; v4lmjpegsrc->x_offset = -1; v4lmjpegsrc->y_offset = -1; #endif v4lmjpegsrc->quality = 50; v4lmjpegsrc->numbufs = 64; /* no clock */ v4lmjpegsrc->clock = NULL; /* fps */ v4lmjpegsrc->use_fixed_fps = TRUE; } static gfloat gst_v4lmjpegsrc_get_fps (GstV4lMjpegSrc *v4lmjpegsrc) { gint norm; gfloat fps; if (!v4lmjpegsrc->use_fixed_fps && v4lmjpegsrc->clock != NULL && v4lmjpegsrc->handled > 0) { /* try to get time from clock master and calculate fps */ GstClockTime time = gst_clock_get_time(v4lmjpegsrc->clock) - v4lmjpegsrc->substract_time; return v4lmjpegsrc->handled * GST_SECOND / time; } /* if that failed ... */ if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lmjpegsrc))) return 0.; if (!gst_v4l_get_chan_norm(GST_V4LELEMENT(v4lmjpegsrc), NULL, &norm)) return 0.; if (norm == VIDEO_MODE_NTSC) fps = 30000/1001; else fps = 25.; return fps; } static gboolean gst_v4lmjpegsrc_src_convert (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value) { GstV4lMjpegSrc *v4lmjpegsrc; gdouble fps; v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); if ((fps = gst_v4lmjpegsrc_get_fps(v4lmjpegsrc)) == 0) return FALSE; switch (src_format) { case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_DEFAULT: *dest_value = src_value * fps / GST_SECOND; break; default: return FALSE; } break; case GST_FORMAT_DEFAULT: switch (*dest_format) { case GST_FORMAT_TIME: *dest_value = src_value * GST_SECOND / fps; break; default: return FALSE; } break; default: return FALSE; } return TRUE; } static gboolean gst_v4lmjpegsrc_src_query (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); gboolean res = TRUE; gdouble fps; if ((fps = gst_v4lmjpegsrc_get_fps(v4lmjpegsrc)) == 0) return FALSE; switch (type) { case GST_QUERY_POSITION: switch (*format) { case GST_FORMAT_TIME: *value = v4lmjpegsrc->handled * GST_SECOND / fps; break; case GST_FORMAT_DEFAULT: *value = v4lmjpegsrc->handled; break; default: res = FALSE; break; } break; default: res = FALSE; break; } return res; } static inline gulong calc_bufsize (int hor_dec, int ver_dec) { guint8 div = hor_dec * ver_dec; guint32 num = (1024 * 512) / (div); guint32 result = 2; num--; while (num) { num >>= 1; result <<= 1; } if (result > (512 * 1024)) return (512 * 1024); if (result < 8192) return 8192; return result; } static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad *pad, const GstCaps *caps) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC(gst_pad_get_parent(pad)); gint hor_dec, ver_dec; gint w, h; gint max_w = GST_V4LELEMENT(v4lmjpegsrc)->vcap.maxwidth, max_h = GST_V4LELEMENT(v4lmjpegsrc)->vcap.maxheight; gulong bufsize; GstStructure *structure; /* in case the buffers are active (which means that we already * did capsnego before and didn't clean up), clean up anyways */ if (GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc))) { if (!gst_v4lmjpegsrc_capture_deinit(v4lmjpegsrc)) return GST_PAD_LINK_REFUSED; } else if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lmjpegsrc))) { return GST_PAD_LINK_DELAYED; } /* Note: basically, we don't give a damn about the opposite caps here. * that might seem odd, but it isn't. we know that the opposite caps is * either NULL or has mime type video/x-jpeg, and in both cases, we'll set * our own mime type back and it'll work. Other properties are to be set * by the src, not by the opposite caps */ structure = gst_caps_get_structure (caps, 0); gst_structure_get_int (structure, "width", &w); gst_structure_get_int (structure, "height", &h); /* figure out decimation */ if (w >= max_w) { hor_dec = 1; } else if (w*2 >= max_w) { hor_dec = 2; } else { hor_dec = 4; } if (h >= max_h) { ver_dec = 1; } else if (h*2 >= max_h) { ver_dec = 2; } else { ver_dec = 4; } /* calculate bufsize */ bufsize = calc_bufsize(hor_dec, ver_dec); /* set buffer info */ if (!gst_v4lmjpegsrc_set_buffer(v4lmjpegsrc, v4lmjpegsrc->numbufs, bufsize)) { return GST_PAD_LINK_REFUSED; } /* set capture parameters and mmap the buffers */ if (hor_dec == ver_dec) { if (!gst_v4lmjpegsrc_set_capture(v4lmjpegsrc, hor_dec, v4lmjpegsrc->quality)) { return GST_PAD_LINK_REFUSED; } } else { if (!gst_v4lmjpegsrc_set_capture_m(v4lmjpegsrc, 0, 0, max_w, max_h, hor_dec, ver_dec, v4lmjpegsrc->quality)) { return GST_PAD_LINK_REFUSED; } } #if 0 if (!v4lmjpegsrc->frame_width && !v4lmjpegsrc->frame_height && v4lmjpegsrc->x_offset < 0 && v4lmjpegsrc->y_offset < 0 && v4lmjpegsrc->horizontal_decimation == v4lmjpegsrc->vertical_decimation) { if (!gst_v4lmjpegsrc_set_capture(v4lmjpegsrc, v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->quality)) return GST_PAD_LINK_REFUSED; } else { if (!gst_v4lmjpegsrc_set_capture_m(v4lmjpegsrc, v4lmjpegsrc->x_offset, v4lmjpegsrc->y_offset, v4lmjpegsrc->frame_width, v4lmjpegsrc->frame_height, v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->vertical_decimation, v4lmjpegsrc->quality)) return GST_PAD_LINK_REFUSED; } #endif return GST_PAD_LINK_OK; } static GstData* gst_v4lmjpegsrc_get (GstPad *pad) { GstV4lMjpegSrc *v4lmjpegsrc; GstBuffer *buf; gint num; gdouble fps = 0; g_return_val_if_fail (pad != NULL, NULL); v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); if (v4lmjpegsrc->use_fixed_fps && (fps = gst_v4lmjpegsrc_get_fps(v4lmjpegsrc)) == 0) return NULL; if (v4lmjpegsrc->need_writes > 0) { /* use last frame */ num = v4lmjpegsrc->last_frame; v4lmjpegsrc->need_writes--; } else if (v4lmjpegsrc->clock && v4lmjpegsrc->use_fixed_fps) { GstClockTime time; gboolean have_frame = FALSE; do { /* by default, we use the frame once */ v4lmjpegsrc->need_writes = 1; /* grab a frame from the device */ if (!gst_v4lmjpegsrc_grab_frame(v4lmjpegsrc, &num, &v4lmjpegsrc->last_size)) return NULL; v4lmjpegsrc->last_frame = num; time = GST_TIMEVAL_TO_TIME(v4lmjpegsrc->bsync.timestamp) - v4lmjpegsrc->substract_time; /* first check whether we lost any frames according to the device */ if (v4lmjpegsrc->last_seq != 0) { if (v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq > 1) { v4lmjpegsrc->need_writes = v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq; g_signal_emit(G_OBJECT(v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST], 0, v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq - 1); } } v4lmjpegsrc->last_seq = v4lmjpegsrc->bsync.seq; /* decide how often we're going to write the frame - set * v4lmjpegsrc->need_writes to (that-1) and have_frame to TRUE * if we're going to write it - else, just continue. * * time is generally the system or audio clock. Let's * say that we've written one second of audio, then we want * to have written one second of video too, within the same * timeframe. This means that if time - begin_time = X sec, * we want to have written X*fps frames. If we've written * more - drop, if we've written less - dup... */ if (v4lmjpegsrc->handled * (GST_SECOND/fps) - time > 1.5 * (GST_SECOND/fps)) { /* yo dude, we've got too many frames here! Drop! DROP! */ v4lmjpegsrc->need_writes--; /* -= (v4lmjpegsrc->handled - (time / fps)); */ g_signal_emit(G_OBJECT(v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP], 0); } else if (v4lmjpegsrc->handled * (GST_SECOND/fps) - time < - 1.5 * (GST_SECOND/fps)) { /* this means we're lagging far behind */ v4lmjpegsrc->need_writes++; /* += ((time / fps) - v4lmjpegsrc->handled); */ g_signal_emit(G_OBJECT(v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT], 0); } if (v4lmjpegsrc->need_writes > 0) { have_frame = TRUE; v4lmjpegsrc->use_num_times[num] = v4lmjpegsrc->need_writes; v4lmjpegsrc->need_writes--; } else { gst_v4lmjpegsrc_requeue_frame(v4lmjpegsrc, num); } } while (!have_frame); } else { /* grab a frame from the device */ if (!gst_v4lmjpegsrc_grab_frame(v4lmjpegsrc, &num, &v4lmjpegsrc->last_size)) return NULL; v4lmjpegsrc->use_num_times[num] = 1; } buf = gst_buffer_new (); GST_BUFFER_FREE_DATA_FUNC (buf) = gst_v4lmjpegsrc_buffer_free; GST_BUFFER_PRIVATE (buf) = v4lmjpegsrc; GST_BUFFER_DATA(buf) = gst_v4lmjpegsrc_get_buffer(v4lmjpegsrc, num); GST_BUFFER_SIZE(buf) = v4lmjpegsrc->last_size; GST_BUFFER_MAXSIZE(buf) = v4lmjpegsrc->breq.size; GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY | GST_BUFFER_DONTFREE); if (v4lmjpegsrc->use_fixed_fps) GST_BUFFER_TIMESTAMP(buf) = v4lmjpegsrc->handled * GST_SECOND / fps; else /* calculate time based on our own clock */ GST_BUFFER_TIMESTAMP(buf) = GST_TIMEVAL_TO_TIME(v4lmjpegsrc->bsync.timestamp) - v4lmjpegsrc->substract_time; v4lmjpegsrc->handled++; g_signal_emit(G_OBJECT(v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE], 0); return GST_DATA (buf); } static GstCaps* gst_v4lmjpegsrc_getcaps (GstPad *pad) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC(gst_pad_get_parent(pad)); struct video_capability *vcap = &GST_V4LELEMENT(v4lmjpegsrc)->vcap; if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lmjpegsrc))) { return NULL; } return gst_caps_new_simple ("video/x-jpeg", "width", GST_TYPE_INT_RANGE, vcap->maxwidth/4, vcap->maxwidth, "height", GST_TYPE_INT_RANGE, vcap->maxheight/4, vcap->maxheight, "framerate", GST_TYPE_DOUBLE_RANGE, 0.0, G_MAXDOUBLE, NULL); } static void gst_v4lmjpegsrc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GstV4lMjpegSrc *v4lmjpegsrc; g_return_if_fail(GST_IS_V4LMJPEGSRC(object)); v4lmjpegsrc = GST_V4LMJPEGSRC(object); switch (prop_id) { #if 0 case ARG_X_OFFSET: v4lmjpegsrc->x_offset = g_value_get_int(value); break; case ARG_Y_OFFSET: v4lmjpegsrc->y_offset = g_value_get_int(value); break; case ARG_F_WIDTH: v4lmjpegsrc->frame_width = g_value_get_int(value); break; case ARG_F_HEIGHT: v4lmjpegsrc->frame_height = g_value_get_int(value); break; #endif case ARG_QUALITY: v4lmjpegsrc->quality = g_value_get_int(value); break; case ARG_NUMBUFS: v4lmjpegsrc->numbufs = g_value_get_int(value); break; case ARG_USE_FIXED_FPS: if (!GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc))) { v4lmjpegsrc->use_fixed_fps = g_value_get_boolean(value); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_v4lmjpegsrc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GstV4lMjpegSrc *v4lmjpegsrc; g_return_if_fail(GST_IS_V4LMJPEGSRC(object)); v4lmjpegsrc = GST_V4LMJPEGSRC(object); switch (prop_id) { #if 0 case ARG_X_OFFSET: g_value_set_int(value, v4lmjpegsrc->x_offset); break; case ARG_Y_OFFSET: g_value_set_int(value, v4lmjpegsrc->y_offset); break; case ARG_F_WIDTH: g_value_set_int(value, v4lmjpegsrc->frame_width); break; case ARG_F_HEIGHT: g_value_set_int(value, v4lmjpegsrc->frame_height); break; #endif case ARG_QUALITY: g_value_set_int(value, v4lmjpegsrc->quality); break; case ARG_NUMBUFS: if (GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc))) g_value_set_int(value, v4lmjpegsrc->breq.count); else g_value_set_int(value, v4lmjpegsrc->numbufs); break; case ARG_BUFSIZE: g_value_set_int(value, v4lmjpegsrc->breq.size); break; case ARG_USE_FIXED_FPS: g_value_set_boolean(value, v4lmjpegsrc->use_fixed_fps); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstElementStateReturn gst_v4lmjpegsrc_change_state (GstElement *element) { GstV4lMjpegSrc *v4lmjpegsrc; GTimeVal time; g_return_val_if_fail(GST_IS_V4LMJPEGSRC(element), GST_STATE_FAILURE); v4lmjpegsrc = GST_V4LMJPEGSRC(element); switch (GST_STATE_TRANSITION(element)) { case GST_STATE_READY_TO_PAUSED: /* actual buffer set-up used to be done here - but I moved * it to capsnego itself */ v4lmjpegsrc->handled = 0; v4lmjpegsrc->need_writes = 0; v4lmjpegsrc->last_frame = 0; v4lmjpegsrc->substract_time = 0; break; case GST_STATE_PAUSED_TO_PLAYING: /* queue all buffer, start streaming capture */ if (!gst_v4lmjpegsrc_capture_start(v4lmjpegsrc)) return GST_STATE_FAILURE; g_get_current_time(&time); v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME(time) - v4lmjpegsrc->substract_time; v4lmjpegsrc->last_seq = 0; break; case GST_STATE_PLAYING_TO_PAUSED: g_get_current_time(&time); v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME(time) - v4lmjpegsrc->substract_time; /* de-queue all queued buffers */ if (!gst_v4lmjpegsrc_capture_stop(v4lmjpegsrc)) return GST_STATE_FAILURE; break; case GST_STATE_PAUSED_TO_READY: /* stop capturing, unmap all buffers */ if (!gst_v4lmjpegsrc_capture_deinit(v4lmjpegsrc)) return GST_STATE_FAILURE; break; } if (GST_ELEMENT_CLASS (parent_class)->change_state) return GST_ELEMENT_CLASS (parent_class)->change_state (element); return GST_STATE_SUCCESS; } static void gst_v4lmjpegsrc_set_clock (GstElement *element, GstClock *clock) { GST_V4LMJPEGSRC(element)->clock = clock; } #if 0 static GstBuffer* gst_v4lmjpegsrc_buffer_new (GstBufferPool *pool, guint64 offset, guint size, gpointer user_data) { GstBuffer *buffer; GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC(user_data); if (!GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc))) return NULL; buffer = gst_buffer_new(); if (!buffer) return NULL; /* TODO: add interlacing info to buffer as metadata */ GST_BUFFER_MAXSIZE(buffer) = v4lmjpegsrc->breq.size; GST_BUFFER_FLAG_SET(buffer, GST_BUFFER_DONTFREE); return buffer; } #endif static void gst_v4lmjpegsrc_buffer_free (GstBuffer *buf) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (GST_BUFFER_PRIVATE (buf)); int n; if (gst_element_get_state(GST_ELEMENT(v4lmjpegsrc)) != GST_STATE_PLAYING) return; /* we've already cleaned up ourselves */ for (n=0;nbreq.count;n++) if (GST_BUFFER_DATA(buf) == gst_v4lmjpegsrc_get_buffer(v4lmjpegsrc, n)) { v4lmjpegsrc->use_num_times[n]--; if (v4lmjpegsrc->use_num_times[n] <= 0) { gst_v4lmjpegsrc_requeue_frame(v4lmjpegsrc, n); } break; } if (n == v4lmjpegsrc->breq.count) gst_element_error(v4lmjpegsrc, RESOURCE, TOO_LAZY, NULL, ("Couldn't find the buffer")); }