/* 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 #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #endif #include #include "v4lmjpegsrc_calls.h" /* elementfactory information */ static GstElementDetails gst_v4lmjpegsrc_details = { "Video (video4linux/MJPEG) Source", "Source/Video", "LGPL", "Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device", VERSION, "Ronald Bultje ", "(C) 2001", }; /* 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 }; /* init functions */ static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass *klass); static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc *v4lmjpegsrc); /* pad/buffer functions */ static gboolean gst_v4lmjpegsrc_srcconvert (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value); static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad *pad, GstCaps *caps); static GstBuffer* gst_v4lmjpegsrc_get (GstPad *pad); static GstCaps* gst_v4lmjpegsrc_getcaps (GstPad *pad, GstCaps *caps); /* 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); /* bufferpool functions */ static GstBuffer* gst_v4lmjpegsrc_buffer_new (GstBufferPool *pool, guint64 offset, guint size, gpointer user_data); static void gst_v4lmjpegsrc_buffer_free (GstBufferPool *pool, GstBuffer *buf, gpointer user_data); static GstCaps *capslist = NULL; static GstPadTemplate *src_template; 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), NULL, 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_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","quality", G_MININT,G_MAXINT,0,G_PARAM_WRITABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NUMBUFS, g_param_spec_int("num_buffers","Num Buffers","Number of 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", "Size of buffers", 0, G_MAXINT, 0, 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) { GST_FLAG_SET(GST_ELEMENT(v4lmjpegsrc), GST_ELEMENT_THREAD_SUGGESTED); v4lmjpegsrc->srcpad = gst_pad_new_from_template (src_template, "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_srcconvert); v4lmjpegsrc->bufferpool = gst_buffer_pool_new( NULL, NULL, (GstBufferPoolBufferNewFunction)gst_v4lmjpegsrc_buffer_new, NULL, (GstBufferPoolBufferFreeFunction)gst_v4lmjpegsrc_buffer_free, v4lmjpegsrc); #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_srcconvert (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 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; } #define gst_caps_get_int_range(caps, name, min, max) \ gst_props_entry_get_int_range(gst_props_get_entry((caps)->properties, \ name), \ min, max) static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad *pad, GstCaps *caps) { GstPadLinkReturn ret_val; 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; gfloat fps = gst_v4lmjpegsrc_get_fps(v4lmjpegsrc); /* 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 */ if (gst_caps_has_property(caps, "width")) { if (gst_caps_has_fixed_property(caps, "width")) { gst_caps_get_int(caps, "width", &w); } else { int max; gst_caps_get_int_range(caps, "width", &max, &w); } } if (gst_caps_has_property(caps, "height")) { if (gst_caps_has_fixed_property(caps, "height")) { gst_caps_get_int(caps, "height", &h); } else { int max; gst_caps_get_int_range(caps, "height", &max, &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 /* we now have an actual width/height - *set it* */ caps = gst_caps_new("v4lmjpegsrc_caps", "video/x-jpeg", gst_props_new( "width", GST_PROPS_INT(v4lmjpegsrc->end_width), "height", GST_PROPS_INT(v4lmjpegsrc->end_height), "framerate", GST_PROPS_FLOAT(fps), NULL ) ); if ((ret_val = gst_pad_try_set_caps(v4lmjpegsrc->srcpad, caps)) == GST_PAD_LINK_REFUSED) return GST_PAD_LINK_REFUSED; else if (ret_val == GST_PAD_LINK_DELAYED) return GST_PAD_LINK_DELAYED; if (!gst_v4lmjpegsrc_capture_init(v4lmjpegsrc)) return GST_PAD_LINK_REFUSED; return GST_PAD_LINK_DONE; } static GstBuffer* 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; buf = gst_buffer_new_from_pool(v4lmjpegsrc->bufferpool, 0, 0); if (!buf) { gst_element_error(GST_ELEMENT(v4lmjpegsrc), "Failed to create a new GstBuffer"); 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; } GST_BUFFER_DATA(buf) = gst_v4lmjpegsrc_get_buffer(v4lmjpegsrc, num); GST_BUFFER_SIZE(buf) = v4lmjpegsrc->last_size; 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 buf; } static GstCaps* gst_v4lmjpegsrc_getcaps (GstPad *pad, GstCaps *_caps) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC(gst_pad_get_parent(pad)); struct video_capability *vcap = &GST_V4LELEMENT(v4lmjpegsrc)->vcap; GstCaps *caps; if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lmjpegsrc))) { return NULL; } caps = GST_CAPS_NEW("v4lmjpegsrc_jpeg_caps", "video/x-jpeg", "width", GST_PROPS_INT_RANGE(vcap->maxwidth/4, vcap->maxwidth), "height", GST_PROPS_INT_RANGE(vcap->maxheight/4, vcap->maxheight), "framerate", GST_PROPS_FLOAT_RANGE(0, G_MAXFLOAT), NULL); return caps; } 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: g_value_set_int(value, v4lmjpegsrc->breq.count); 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; GstElementStateReturn parent_value; 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) { parent_value = GST_ELEMENT_CLASS (parent_class)->change_state (element); } else { parent_value = GST_STATE_FAILURE; } if (GST_STATE_TRANSITION(element) == GST_STATE_NULL_TO_READY) { /* do autodetection if no input/norm is selected yet */ if ((GST_V4LELEMENT(v4lmjpegsrc)->norm < VIDEO_MODE_PAL || GST_V4LELEMENT(v4lmjpegsrc)->norm == VIDEO_MODE_AUTO) || (GST_V4LELEMENT(v4lmjpegsrc)->channel < 0 || GST_V4LELEMENT(v4lmjpegsrc)->channel == V4L_MJPEG_INPUT_AUTO)) { gint norm, input; if (GST_V4LELEMENT(v4lmjpegsrc)->norm < 0) norm = VIDEO_MODE_AUTO; else norm = GST_V4LELEMENT(v4lmjpegsrc)->norm; if (GST_V4LELEMENT(v4lmjpegsrc)->channel < 0) input = V4L_MJPEG_INPUT_AUTO; else input = GST_V4LELEMENT(v4lmjpegsrc)->channel; if (!gst_v4lmjpegsrc_set_input_norm(v4lmjpegsrc, input, norm)) return GST_STATE_FAILURE; } } if (GST_ELEMENT_CLASS (parent_class)->change_state) return parent_value; return GST_STATE_SUCCESS; } static void gst_v4lmjpegsrc_set_clock (GstElement *element, GstClock *clock) { GST_V4LMJPEGSRC(element)->clock = clock; } 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; } static void gst_v4lmjpegsrc_buffer_free (GstBufferPool *pool, GstBuffer *buf, gpointer user_data) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (user_data); 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(GST_ELEMENT(v4lmjpegsrc), "Couldn't find the buffer"); /* free the buffer struct et all */ gst_buffer_default_free(buf); } static gboolean plugin_init (GModule *module, GstPlugin *plugin) { GstElementFactory *factory; GstCaps *caps; /* create an elementfactory for the v4lmjpegsrcparse element */ factory = gst_element_factory_new("v4lmjpegsrc",GST_TYPE_V4LMJPEGSRC, &gst_v4lmjpegsrc_details); g_return_val_if_fail(factory != NULL, FALSE); caps = gst_caps_new ("v4lmjpegsrc_caps", "video/x-jpeg", gst_props_new ( "width", GST_PROPS_INT_RANGE (0, G_MAXINT), "height", GST_PROPS_INT_RANGE (0, G_MAXINT), "framerate", GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT), NULL ) ); capslist = gst_caps_append(capslist, caps); src_template = gst_pad_template_new ( "src", GST_PAD_SRC, GST_PAD_ALWAYS, capslist, 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, "v4lmjpegsrc", plugin_init };