/* GStreamer * Copyright (C) <1999> Erik Walthinsen * * 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. */ /** * SECTION:element-videorate * * This element takes an incoming stream of timestamped video frames. * It will produce a perfect stream that matches the source pad's framerate. * * The correction is performed by dropping and duplicating frames, no fancy * algorithm is used to interpolate frames (yet). * * By default the element will simply negotiate the same framerate on its * source and sink pad. * * This operation is useful to link to elements that require a perfect stream. * Typical examples are formats that do not store timestamps for video frames, * but only store a framerate, like Ogg and AVI. * * A conversion to a specific framerate can be forced by using filtered caps on * the source pad. * * The properties #GstVideoRate:in, #GstVideoRate:out, #GstVideoRate:duplicate * and #GstVideoRate:drop can be read to obtain information about number of * input frames, output frames, dropped frames (i.e. the number of unused input * frames) and duplicated frames (i.e. the number of times an input frame was * duplicated, beside being used normally). * * An input stream that needs no adjustments will thus never have dropped or * duplicated frames. * * When the #GstVideoRate:silent property is set to FALSE, a GObject property * notification will be emitted whenever one of the #GstVideoRate:duplicate or * #GstVideoRate:drop values changes. * This can potentially cause performance degradation. * Note that property notification will happen from the streaming thread, so * applications should be prepared for this. * * * Example pipelines * |[ * gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videorate ! video/x-raw,framerate=15/1 ! xvimagesink * ]| Decode an Ogg/Theora file and adjust the framerate to 15 fps before playing. * To create the test Ogg/Theora file refer to the documentation of theoraenc. * |[ * gst-launch -v v4l2src ! videorate ! video/x-raw,framerate=25/2 ! theoraenc ! oggmux ! filesink location=recording.ogg * ]| Capture video from a V4L device, and adjust the stream to 12.5 fps before * encoding to Ogg/Theora. * * * Last reviewed on 2006-09-02 (0.10.11) */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstvideorate.h" GST_DEBUG_CATEGORY_STATIC (video_rate_debug); #define GST_CAT_DEFAULT video_rate_debug /* GstVideoRate signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; #define DEFAULT_SILENT TRUE #define DEFAULT_NEW_PREF 1.0 #define DEFAULT_SKIP_TO_FIRST FALSE #define DEFAULT_DROP_ONLY FALSE #define DEFAULT_AVERAGE_PERIOD 0 #define DEFAULT_MAX_RATE G_MAXINT enum { PROP_0, PROP_IN, PROP_OUT, PROP_DUP, PROP_DROP, PROP_SILENT, PROP_NEW_PREF, PROP_SKIP_TO_FIRST, PROP_DROP_ONLY, PROP_AVERAGE_PERIOD, PROP_MAX_RATE }; static GstStaticPadTemplate gst_video_rate_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw;" "image/jpeg;" "image/png") ); static GstStaticPadTemplate gst_video_rate_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw;" "image/jpeg;" "image/png") ); static void gst_video_rate_swap_prev (GstVideoRate * videorate, GstBuffer * buffer, gint64 time); static gboolean gst_video_rate_sink_event (GstBaseTransform * trans, GstEvent * event); static gboolean gst_video_rate_query (GstBaseTransform * trans, GstPadDirection direction, GstQuery * query); static gboolean gst_video_rate_setcaps (GstBaseTransform * trans, GstCaps * in_caps, GstCaps * out_caps); static GstCaps *gst_video_rate_transform_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter); static void gst_video_rate_fixate_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps); static GstFlowReturn gst_video_rate_transform_ip (GstBaseTransform * trans, GstBuffer * buf); static gboolean gst_video_rate_start (GstBaseTransform * trans); static gboolean gst_video_rate_stop (GstBaseTransform * trans); static void gst_video_rate_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_video_rate_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GParamSpec *pspec_drop = NULL; static GParamSpec *pspec_duplicate = NULL; #define gst_video_rate_parent_class parent_class G_DEFINE_TYPE (GstVideoRate, gst_video_rate, GST_TYPE_BASE_TRANSFORM); static void gst_video_rate_class_init (GstVideoRateClass * klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); GstElementClass *element_class = GST_ELEMENT_CLASS (klass); GstBaseTransformClass *base_class = GST_BASE_TRANSFORM_CLASS (klass); object_class->set_property = gst_video_rate_set_property; object_class->get_property = gst_video_rate_get_property; base_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_rate_setcaps); base_class->transform_caps = GST_DEBUG_FUNCPTR (gst_video_rate_transform_caps); base_class->transform_ip = GST_DEBUG_FUNCPTR (gst_video_rate_transform_ip); base_class->sink_event = GST_DEBUG_FUNCPTR (gst_video_rate_sink_event); base_class->start = GST_DEBUG_FUNCPTR (gst_video_rate_start); base_class->stop = GST_DEBUG_FUNCPTR (gst_video_rate_stop); base_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_video_rate_fixate_caps); base_class->query = GST_DEBUG_FUNCPTR (gst_video_rate_query); g_object_class_install_property (object_class, PROP_IN, g_param_spec_uint64 ("in", "In", "Number of input frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (object_class, PROP_OUT, g_param_spec_uint64 ("out", "Out", "Number of output frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); pspec_duplicate = g_param_spec_uint64 ("duplicate", "Duplicate", "Number of duplicated frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS); g_object_class_install_property (object_class, PROP_DUP, pspec_duplicate); pspec_drop = g_param_spec_uint64 ("drop", "Drop", "Number of dropped frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS); g_object_class_install_property (object_class, PROP_DROP, pspec_drop); g_object_class_install_property (object_class, PROP_SILENT, g_param_spec_boolean ("silent", "silent", "Don't emit notify for dropped and duplicated frames", DEFAULT_SILENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (object_class, PROP_NEW_PREF, g_param_spec_double ("new-pref", "New Pref", "Value indicating how much to prefer new frames (unused)", 0.0, 1.0, DEFAULT_NEW_PREF, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstVideoRate:skip-to-first: * * Don't produce buffers before the first one we receive. * * Since: 0.10.25 */ g_object_class_install_property (object_class, PROP_SKIP_TO_FIRST, g_param_spec_boolean ("skip-to-first", "Skip to first buffer", "Don't produce buffers before the first one we receive", DEFAULT_SKIP_TO_FIRST, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstVideoRate:drop-only: * * Only drop frames, no duplicates are produced. * * Since: 0.10.36 */ g_object_class_install_property (object_class, PROP_DROP_ONLY, g_param_spec_boolean ("drop-only", "Only Drop", "Only drop frames, no duplicates are produced", DEFAULT_DROP_ONLY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstVideoRate:average-period: * * Arrange for maximum framerate by dropping frames beyond a certain framerate, * where the framerate is calculated using a moving average over the * configured. * * Since: 0.10.36 */ g_object_class_install_property (object_class, PROP_AVERAGE_PERIOD, g_param_spec_uint64 ("average-period", "Period over which to average", "Period over which to average the framerate (in ns) (0 = disabled)", 0, G_MAXINT64, DEFAULT_AVERAGE_PERIOD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstVideoRate:max-rate: * * maximum framerate to pass through * * Since: 0.10.36 */ g_object_class_install_property (object_class, PROP_MAX_RATE, g_param_spec_int ("max-rate", "maximum framerate", "Maximum framerate allowed to pass through " "(in frames per second, implies drop-only)", 1, G_MAXINT, DEFAULT_MAX_RATE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS)); gst_element_class_set_details_simple (element_class, "Video rate adjuster", "Filter/Effect/Video", "Drops/duplicates/adjusts timestamps on video frames to make a perfect stream", "Wim Taymans "); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_video_rate_sink_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_video_rate_src_template)); } static void gst_value_fraction_get_extremes (const GValue * v, gint * min_num, gint * min_denom, gint * max_num, gint * max_denom) { if (GST_VALUE_HOLDS_FRACTION (v)) { *min_num = *max_num = gst_value_get_fraction_numerator (v); *min_denom = *max_denom = gst_value_get_fraction_denominator (v); } else if (GST_VALUE_HOLDS_FRACTION_RANGE (v)) { const GValue *min, *max; min = gst_value_get_fraction_range_min (v); *min_num = gst_value_get_fraction_numerator (min); *min_denom = gst_value_get_fraction_denominator (min); max = gst_value_get_fraction_range_max (v); *max_num = gst_value_get_fraction_numerator (max); *max_denom = gst_value_get_fraction_denominator (max); } else if (GST_VALUE_HOLDS_LIST (v)) { gint min_n = G_MAXINT, min_d = 1, max_n = 0, max_d = 1; int i, n; *min_num = G_MAXINT; *min_denom = 1; *max_num = 0; *max_denom = 1; n = gst_value_list_get_size (v); g_assert (n > 0); for (i = 0; i < n; i++) { const GValue *t = gst_value_list_get_value (v, i); gst_value_fraction_get_extremes (t, &min_n, &min_d, &max_n, &max_d); if (gst_util_fraction_compare (min_n, min_d, *min_num, *min_denom) < 0) { *min_num = min_n; *min_denom = min_d; } if (gst_util_fraction_compare (max_n, max_d, *max_num, *max_denom) > 0) { *max_num = max_n; *max_denom = max_d; } } } else { g_warning ("Unknown type for framerate"); *min_num = 0; *min_denom = 1; *max_num = G_MAXINT; *max_denom = 1; } } /* Clamp the framerate in a caps structure to be a smaller range then * [1...max_rate], otherwise return false */ static gboolean gst_video_max_rate_clamp_structure (GstStructure * s, gint maxrate, gint * min_num, gint * min_denom, gint * max_num, gint * max_denom) { gboolean ret = FALSE; if (!gst_structure_has_field (s, "framerate")) { /* No framerate field implies any framerate, clamping would result in * [1..max_rate] so not a real subset */ goto out; } else { const GValue *v; GValue intersection = { 0, }; GValue clamp = { 0, }; gint tmp_num, tmp_denom; g_value_init (&clamp, GST_TYPE_FRACTION_RANGE); gst_value_set_fraction_range_full (&clamp, 0, 1, maxrate, 1); v = gst_structure_get_value (s, "framerate"); ret = gst_value_intersect (&intersection, v, &clamp); g_value_unset (&clamp); if (!ret) goto out; gst_value_fraction_get_extremes (&intersection, min_num, min_denom, max_num, max_denom); gst_value_fraction_get_extremes (v, &tmp_num, &tmp_denom, max_num, max_denom); if (gst_util_fraction_compare (*max_num, *max_denom, maxrate, 1) > 0) { *max_num = maxrate; *max_denom = 1; } gst_structure_take_value (s, "framerate", &intersection); } out: return ret; } static GstCaps * gst_video_rate_transform_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter) { GstVideoRate *videorate = GST_VIDEO_RATE (trans); GstCaps *ret; GstStructure *s, *s2; GstStructure *s3 = NULL; int maxrate = g_atomic_int_get (&videorate->max_rate); /* Should always be called with simple caps */ g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL); ret = gst_caps_copy (caps); s = gst_caps_get_structure (ret, 0); s2 = gst_structure_copy (s); if (videorate->drop_only) { gint min_num = 0, min_denom = 1; gint max_num = G_MAXINT, max_denom = 1; /* Clamp the caps to our maximum rate as the first caps if possible */ if (!gst_video_max_rate_clamp_structure (s, maxrate, &min_num, &min_denom, &max_num, &max_denom)) { min_num = 0; min_denom = 1; max_num = maxrate; max_denom = 1; /* clamp wouldn't be a real subset of 1..maxrate, in this case the sink * caps should become [1..maxrate], [1..maxint] and the src caps just * [1..maxrate]. In case there was a caps incompatibility things will * explode later as appropriate :) * * In case [X..maxrate] == [X..maxint], skip as we'll set it later */ if (direction == GST_PAD_SRC && maxrate != G_MAXINT) gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, min_num, min_denom, maxrate, 1, NULL); else gst_caps_remove_structure (ret, 0); } if (direction == GST_PAD_SRC) { /* We can accept anything as long as it's at least the minimal framerate * the the sink needs */ gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE, min_num, min_denom, G_MAXINT, 1, NULL); /* Also allow unknown framerate, if it isn't already */ if (min_num != 0 || min_denom != 1) { s3 = gst_structure_copy (s); gst_structure_set (s3, "framerate", GST_TYPE_FRACTION, 0, 1, NULL); } } else if (max_num != 0 || max_denom != 1) { /* We can provide everything upto the maximum framerate at the src */ gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, max_num, max_denom, NULL); } } else if (direction == GST_PAD_SINK) { gint min_num = 0, min_denom = 1; gint max_num = G_MAXINT, max_denom = 1; if (!gst_video_max_rate_clamp_structure (s, maxrate, &min_num, &min_denom, &max_num, &max_denom)) gst_caps_remove_structure (ret, 0); gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, maxrate, 1, NULL); } else { /* set the framerate as a range */ gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL); } gst_caps_merge_structure (ret, s2); if (s3 != NULL) gst_caps_merge_structure (ret, s3); return ret; } static void gst_video_rate_fixate_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps) { GstStructure *s; gint num, denom; s = gst_caps_get_structure (caps, 0); if (G_UNLIKELY (!gst_structure_get_fraction (s, "framerate", &num, &denom))) return; s = gst_caps_get_structure (othercaps, 0); gst_structure_fixate_field_nearest_fraction (s, "framerate", num, denom); } static gboolean gst_video_rate_setcaps (GstBaseTransform * trans, GstCaps * in_caps, GstCaps * out_caps) { GstVideoRate *videorate = GST_VIDEO_RATE (trans); GstStructure *structure; gboolean ret = TRUE; gint rate_numerator, rate_denominator; videorate = GST_VIDEO_RATE (trans); GST_DEBUG_OBJECT (trans, "setcaps called in: %" GST_PTR_FORMAT " out: %" GST_PTR_FORMAT, in_caps, out_caps); structure = gst_caps_get_structure (in_caps, 0); if (!gst_structure_get_fraction (structure, "framerate", &rate_numerator, &rate_denominator)) goto no_framerate; videorate->from_rate_numerator = rate_numerator; videorate->from_rate_denominator = rate_denominator; structure = gst_caps_get_structure (out_caps, 0); if (!gst_structure_get_fraction (structure, "framerate", &rate_numerator, &rate_denominator)) goto no_framerate; /* out_frame_count is scaled by the frame rate caps when calculating next_ts. * when the frame rate caps change, we must update base_ts and reset * out_frame_count */ if (videorate->to_rate_numerator) { videorate->base_ts += gst_util_uint64_scale (videorate->out_frame_count, videorate->to_rate_denominator * GST_SECOND, videorate->to_rate_numerator); } videorate->out_frame_count = 0; videorate->to_rate_numerator = rate_numerator; videorate->to_rate_denominator = rate_denominator; if (rate_numerator) videorate->wanted_diff = gst_util_uint64_scale_int (GST_SECOND, rate_denominator, rate_numerator); else videorate->wanted_diff = 0; done: /* After a setcaps, our caps may have changed. In that case, we can't use * the old buffer, if there was one (it might have different dimensions) */ GST_DEBUG_OBJECT (videorate, "swapping old buffers"); gst_video_rate_swap_prev (videorate, NULL, GST_CLOCK_TIME_NONE); videorate->last_ts = GST_CLOCK_TIME_NONE; videorate->average = 0; return ret; no_framerate: { GST_DEBUG_OBJECT (videorate, "no framerate specified"); ret = FALSE; goto done; } } static void gst_video_rate_reset (GstVideoRate * videorate) { GST_DEBUG_OBJECT (videorate, "resetting internal variables"); videorate->in = 0; videorate->out = 0; videorate->base_ts = 0; videorate->out_frame_count = 0; videorate->drop = 0; videorate->dup = 0; videorate->next_ts = GST_CLOCK_TIME_NONE; videorate->last_ts = GST_CLOCK_TIME_NONE; videorate->discont = TRUE; videorate->average = 0; gst_video_rate_swap_prev (videorate, NULL, 0); gst_segment_init (&videorate->segment, GST_FORMAT_TIME); } static void gst_video_rate_init (GstVideoRate * videorate) { gst_video_rate_reset (videorate); videorate->silent = DEFAULT_SILENT; videorate->new_pref = DEFAULT_NEW_PREF; videorate->drop_only = DEFAULT_DROP_ONLY; videorate->average_period = DEFAULT_AVERAGE_PERIOD; videorate->average_period_set = DEFAULT_AVERAGE_PERIOD; videorate->max_rate = DEFAULT_MAX_RATE; videorate->from_rate_numerator = 0; videorate->from_rate_denominator = 0; videorate->to_rate_numerator = 0; videorate->to_rate_denominator = 0; gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (videorate), TRUE); } /* flush the oldest buffer */ static GstFlowReturn gst_video_rate_flush_prev (GstVideoRate * videorate, gboolean duplicate) { GstFlowReturn res; GstBuffer *outbuf; GstClockTime push_ts; if (!videorate->prevbuf) goto eos_before_buffers; /* make sure we can write to the metadata */ outbuf = gst_buffer_make_writable (gst_buffer_ref (videorate->prevbuf)); GST_BUFFER_OFFSET (outbuf) = videorate->out; GST_BUFFER_OFFSET_END (outbuf) = videorate->out + 1; if (videorate->discont) { GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT); videorate->discont = FALSE; } else GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DISCONT); if (duplicate) GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP); else GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_GAP); /* this is the timestamp we put on the buffer */ push_ts = videorate->next_ts; videorate->out++; videorate->out_frame_count++; if (videorate->to_rate_numerator) { /* interpolate next expected timestamp in the segment */ videorate->next_ts = videorate->segment.base + videorate->segment.start + videorate->base_ts + gst_util_uint64_scale (videorate->out_frame_count, videorate->to_rate_denominator * GST_SECOND, videorate->to_rate_numerator); GST_BUFFER_DURATION (outbuf) = videorate->next_ts - push_ts; } /* We do not need to update time in VFR (variable frame rate) mode */ if (!videorate->drop_only) { /* adapt for looping, bring back to time in current segment. */ GST_BUFFER_TIMESTAMP (outbuf) = push_ts - videorate->segment.base; } GST_LOG_OBJECT (videorate, "old is best, dup, pushing buffer outgoing ts %" GST_TIME_FORMAT, GST_TIME_ARGS (push_ts)); res = gst_pad_push (GST_BASE_TRANSFORM_SRC_PAD (videorate), outbuf); return res; /* WARNINGS */ eos_before_buffers: { GST_INFO_OBJECT (videorate, "got EOS before any buffer was received"); return GST_FLOW_OK; } } static void gst_video_rate_swap_prev (GstVideoRate * videorate, GstBuffer * buffer, gint64 time) { GST_LOG_OBJECT (videorate, "swap_prev: storing buffer %p in prev", buffer); if (videorate->prevbuf) gst_buffer_unref (videorate->prevbuf); videorate->prevbuf = buffer != NULL ? gst_buffer_ref (buffer) : NULL; videorate->prev_ts = time; } static void gst_video_rate_notify_drop (GstVideoRate * videorate) { #if !GLIB_CHECK_VERSION(2,26,0) g_object_notify ((GObject *) videorate, "drop"); #else g_object_notify_by_pspec ((GObject *) videorate, pspec_drop); #endif } static void gst_video_rate_notify_duplicate (GstVideoRate * videorate) { #if !GLIB_CHECK_VERSION(2,26,0) g_object_notify ((GObject *) videorate, "duplicate"); #else g_object_notify_by_pspec ((GObject *) videorate, pspec_duplicate); #endif } #define MAGIC_LIMIT 25 static gboolean gst_video_rate_sink_event (GstBaseTransform * trans, GstEvent * event) { GstVideoRate *videorate; videorate = GST_VIDEO_RATE (trans); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEGMENT: { const GstSegment *segment; gst_event_parse_segment (event, &segment); if (segment->format != GST_FORMAT_TIME) goto format_error; GST_DEBUG_OBJECT (videorate, "handle NEWSEGMENT"); /* close up the previous segment, if appropriate */ if (videorate->prevbuf) { gint count = 0; GstFlowReturn res; res = GST_FLOW_OK; /* fill up to the end of current segment, * or only send out the stored buffer if there is no specific stop. * regardless, prevent going loopy in strange cases */ while (res == GST_FLOW_OK && count <= MAGIC_LIMIT && ((GST_CLOCK_TIME_IS_VALID (videorate->segment.stop) && videorate->next_ts - videorate->segment.base < videorate->segment.stop) || count < 1)) { res = gst_video_rate_flush_prev (videorate, count > 0); count++; } if (count > 1) { videorate->dup += count - 1; if (!videorate->silent) gst_video_rate_notify_duplicate (videorate); } else if (count == 0) { videorate->drop++; if (!videorate->silent) gst_video_rate_notify_drop (videorate); } /* clean up for the new one; _chain will resume from the new start */ videorate->base_ts = 0; videorate->out_frame_count = 0; gst_video_rate_swap_prev (videorate, NULL, 0); videorate->next_ts = GST_CLOCK_TIME_NONE; } /* We just want to update the accumulated stream_time */ gst_segment_copy_into (segment, &videorate->segment); GST_DEBUG_OBJECT (videorate, "updated segment: %" GST_SEGMENT_FORMAT, &videorate->segment); break; } case GST_EVENT_EOS:{ gint count = 0; GstFlowReturn res = GST_FLOW_OK; GST_DEBUG_OBJECT (videorate, "Got EOS"); /* If the segment has a stop position, fill the segment */ if (GST_CLOCK_TIME_IS_VALID (videorate->segment.stop)) { /* fill up to the end of current segment, * or only send out the stored buffer if there is no specific stop. * regardless, prevent going loopy in strange cases */ while (res == GST_FLOW_OK && count <= MAGIC_LIMIT && ((videorate->next_ts - videorate->segment.base < videorate->segment.stop) || count < 1)) { res = gst_video_rate_flush_prev (videorate, count > 0); count++; } } else if (videorate->prevbuf) { /* Output at least one frame but if the buffer duration is valid, output * enough frames to use the complete buffer duration */ if (GST_BUFFER_DURATION_IS_VALID (videorate->prevbuf)) { GstClockTime end_ts = videorate->next_ts + GST_BUFFER_DURATION (videorate->prevbuf); while (res == GST_FLOW_OK && count <= MAGIC_LIMIT && ((videorate->next_ts - videorate->segment.base < end_ts) || count < 1)) { res = gst_video_rate_flush_prev (videorate, count > 0); count++; } } else { res = gst_video_rate_flush_prev (videorate, FALSE); count = 1; } } if (count > 1) { videorate->dup += count - 1; if (!videorate->silent) gst_video_rate_notify_duplicate (videorate); } else if (count == 0) { videorate->drop++; if (!videorate->silent) gst_video_rate_notify_drop (videorate); } break; } case GST_EVENT_FLUSH_STOP: /* also resets the segment */ GST_DEBUG_OBJECT (videorate, "Got FLUSH_STOP"); gst_video_rate_reset (videorate); break; default: break; } return TRUE; /* ERRORS */ format_error: { GST_WARNING_OBJECT (videorate, "Got segment but doesn't have GST_FORMAT_TIME value"); return FALSE; } } static gboolean gst_video_rate_query (GstBaseTransform * trans, GstPadDirection direction, GstQuery * query) { GstVideoRate *videorate = GST_VIDEO_RATE (trans); gboolean res = FALSE; GstPad *otherpad; otherpad = (direction == GST_PAD_SRC) ? GST_BASE_TRANSFORM_SINK_PAD (trans) : GST_BASE_TRANSFORM_SRC_PAD (trans); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_LATENCY: { GstClockTime min, max; gboolean live; guint64 latency; guint64 avg_period; GstPad *peer; GST_OBJECT_LOCK (videorate); avg_period = videorate->average_period_set; GST_OBJECT_UNLOCK (videorate); if (avg_period == 0 && (peer = gst_pad_get_peer (otherpad))) { if ((res = gst_pad_query (peer, query))) { gst_query_parse_latency (query, &live, &min, &max); GST_DEBUG_OBJECT (videorate, "Peer latency: min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT, GST_TIME_ARGS (min), GST_TIME_ARGS (max)); if (videorate->from_rate_numerator != 0) { /* add latency. We don't really know since we hold on to the frames * until we get a next frame, which can be anything. We assume * however that this will take from_rate time. */ latency = gst_util_uint64_scale (GST_SECOND, videorate->from_rate_denominator, videorate->from_rate_numerator); } else { /* no input framerate, we don't know */ latency = 0; } GST_DEBUG_OBJECT (videorate, "Our latency: %" GST_TIME_FORMAT, GST_TIME_ARGS (latency)); min += latency; if (max != -1) max += latency; GST_DEBUG_OBJECT (videorate, "Calculated total latency : min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT, GST_TIME_ARGS (min), GST_TIME_ARGS (max)); gst_query_set_latency (query, live, min, max); } gst_object_unref (peer); break; } /* Simple fallthrough if we don't have a latency or not a peer that we * can't ask about its latency yet.. */ } default: res = GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction, query); break; } return res; } static GstFlowReturn gst_video_rate_trans_ip_max_avg (GstVideoRate * videorate, GstBuffer * buf) { GstClockTime ts = GST_BUFFER_TIMESTAMP (buf); videorate->in++; if (!GST_CLOCK_TIME_IS_VALID (ts) || videorate->wanted_diff == 0) goto push; /* drop frames if they exceed our output rate */ if (GST_CLOCK_TIME_IS_VALID (videorate->last_ts)) { GstClockTimeDiff diff = ts - videorate->last_ts; /* Drop buffer if its early compared to the desired frame rate and * the current average is higher than the desired average */ if (diff < videorate->wanted_diff && videorate->average < videorate->wanted_diff) goto drop; /* Update average */ if (videorate->average) { GstClockTimeDiff wanted_diff; if (G_LIKELY (videorate->average_period > videorate->wanted_diff)) wanted_diff = videorate->wanted_diff; else wanted_diff = videorate->average_period * 10; videorate->average = gst_util_uint64_scale_round (videorate->average, videorate->average_period - wanted_diff, videorate->average_period) + gst_util_uint64_scale_round (diff, wanted_diff, videorate->average_period); } else { videorate->average = diff; } } videorate->last_ts = ts; push: videorate->out++; return GST_FLOW_OK; drop: if (!videorate->silent) gst_video_rate_notify_drop (videorate); return GST_BASE_TRANSFORM_FLOW_DROPPED; } static GstFlowReturn gst_video_rate_transform_ip (GstBaseTransform * trans, GstBuffer * buffer) { GstVideoRate *videorate; GstFlowReturn res = GST_BASE_TRANSFORM_FLOW_DROPPED; GstClockTime intime, in_ts, in_dur; GstClockTime avg_period; gboolean skip = FALSE; videorate = GST_VIDEO_RATE (trans); /* make sure the denominators are not 0 */ if (videorate->from_rate_denominator == 0 || videorate->to_rate_denominator == 0) goto not_negotiated; GST_OBJECT_LOCK (videorate); avg_period = videorate->average_period_set; GST_OBJECT_UNLOCK (videorate); /* MT-safe switching between modes */ if (G_UNLIKELY (avg_period != videorate->average_period)) { gboolean switch_mode = (avg_period == 0 || videorate->average_period == 0); videorate->average_period = avg_period; videorate->last_ts = GST_CLOCK_TIME_NONE; if (switch_mode) { if (avg_period) { /* enabling average mode */ videorate->average = 0; /* make sure no cached buffers from regular mode are left */ gst_video_rate_swap_prev (videorate, NULL, 0); } else { /* enable regular mode */ videorate->next_ts = GST_CLOCK_TIME_NONE; skip = TRUE; } /* max averaging mode has a no latency, normal mode does */ gst_element_post_message (GST_ELEMENT (videorate), gst_message_new_latency (GST_OBJECT (videorate))); } } if (videorate->average_period > 0) return gst_video_rate_trans_ip_max_avg (videorate, buffer); in_ts = GST_BUFFER_TIMESTAMP (buffer); in_dur = GST_BUFFER_DURATION (buffer); if (G_UNLIKELY (in_ts == GST_CLOCK_TIME_NONE)) { in_ts = videorate->last_ts; if (G_UNLIKELY (in_ts == GST_CLOCK_TIME_NONE)) goto invalid_buffer; } /* get the time of the next expected buffer timestamp, we use this when the * next buffer has -1 as a timestamp */ videorate->last_ts = in_ts; if (in_dur != GST_CLOCK_TIME_NONE) videorate->last_ts += in_dur; GST_DEBUG_OBJECT (videorate, "got buffer with timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (in_ts)); /* the input time is the time in the segment + all previously accumulated * segments */ intime = in_ts + videorate->segment.base; /* we need to have two buffers to compare */ if (videorate->prevbuf == NULL) { gst_video_rate_swap_prev (videorate, buffer, intime); videorate->in++; if (!GST_CLOCK_TIME_IS_VALID (videorate->next_ts)) { /* new buffer, we expect to output a buffer that matches the first * timestamp in the segment */ if (videorate->skip_to_first || skip) { videorate->next_ts = intime; videorate->base_ts = in_ts - videorate->segment.start; videorate->out_frame_count = 0; } else { videorate->next_ts = videorate->segment.start + videorate->segment.base; } } } else { GstClockTime prevtime; gint count = 0; gint64 diff1, diff2; prevtime = videorate->prev_ts; GST_LOG_OBJECT (videorate, "BEGINNING prev buf %" GST_TIME_FORMAT " new buf %" GST_TIME_FORMAT " outgoing ts %" GST_TIME_FORMAT, GST_TIME_ARGS (prevtime), GST_TIME_ARGS (intime), GST_TIME_ARGS (videorate->next_ts)); videorate->in++; /* drop new buffer if it's before previous one */ if (intime < prevtime) { GST_DEBUG_OBJECT (videorate, "The new buffer (%" GST_TIME_FORMAT ") is before the previous buffer (%" GST_TIME_FORMAT "). Dropping new buffer.", GST_TIME_ARGS (intime), GST_TIME_ARGS (prevtime)); videorate->drop++; if (!videorate->silent) gst_video_rate_notify_drop (videorate); goto done; } /* got 2 buffers, see which one is the best */ do { diff1 = prevtime - videorate->next_ts; diff2 = intime - videorate->next_ts; /* take absolute values, beware: abs and ABS don't work for gint64 */ if (diff1 < 0) diff1 = -diff1; if (diff2 < 0) diff2 = -diff2; GST_LOG_OBJECT (videorate, "diff with prev %" GST_TIME_FORMAT " diff with new %" GST_TIME_FORMAT " outgoing ts %" GST_TIME_FORMAT, GST_TIME_ARGS (diff1), GST_TIME_ARGS (diff2), GST_TIME_ARGS (videorate->next_ts)); /* output first one when its the best */ if (diff1 <= diff2) { GstFlowReturn r; count++; /* on error the _flush function posted a warning already */ if ((r = gst_video_rate_flush_prev (videorate, count > 1)) != GST_FLOW_OK) { res = r; goto done; } } /* Do not produce any dups. We can exit loop now */ if (videorate->drop_only) break; /* continue while the first one was the best, if they were equal avoid * going into an infinite loop */ } while (diff1 < diff2); /* if we outputed the first buffer more then once, we have dups */ if (count > 1) { videorate->dup += count - 1; if (!videorate->silent) gst_video_rate_notify_duplicate (videorate); } /* if we didn't output the first buffer, we have a drop */ else if (count == 0) { videorate->drop++; if (!videorate->silent) gst_video_rate_notify_drop (videorate); GST_LOG_OBJECT (videorate, "new is best, old never used, drop, outgoing ts %" GST_TIME_FORMAT, GST_TIME_ARGS (videorate->next_ts)); } GST_LOG_OBJECT (videorate, "END, putting new in old, diff1 %" GST_TIME_FORMAT ", diff2 %" GST_TIME_FORMAT ", next_ts %" GST_TIME_FORMAT ", in %" G_GUINT64_FORMAT ", out %" G_GUINT64_FORMAT ", drop %" G_GUINT64_FORMAT ", dup %" G_GUINT64_FORMAT, GST_TIME_ARGS (diff1), GST_TIME_ARGS (diff2), GST_TIME_ARGS (videorate->next_ts), videorate->in, videorate->out, videorate->drop, videorate->dup); /* swap in new one when it's the best */ gst_video_rate_swap_prev (videorate, buffer, intime); } done: return res; /* ERRORS */ not_negotiated: { GST_WARNING_OBJECT (videorate, "no framerate negotiated"); res = GST_FLOW_NOT_NEGOTIATED; goto done; } invalid_buffer: { GST_WARNING_OBJECT (videorate, "Got buffer with GST_CLOCK_TIME_NONE timestamp, discarding it"); res = GST_BASE_TRANSFORM_FLOW_DROPPED; goto done; } } static gboolean gst_video_rate_start (GstBaseTransform * trans) { gst_video_rate_reset (GST_VIDEO_RATE (trans)); return TRUE; } static gboolean gst_video_rate_stop (GstBaseTransform * trans) { gst_video_rate_reset (GST_VIDEO_RATE (trans)); return TRUE; } static void gst_video_rate_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstVideoRate *videorate = GST_VIDEO_RATE (object); GST_OBJECT_LOCK (videorate); switch (prop_id) { case PROP_SILENT: videorate->silent = g_value_get_boolean (value); break; case PROP_NEW_PREF: videorate->new_pref = g_value_get_double (value); break; case PROP_SKIP_TO_FIRST: videorate->skip_to_first = g_value_get_boolean (value); break; case PROP_DROP_ONLY: videorate->drop_only = g_value_get_boolean (value); goto reconfigure; break; case PROP_AVERAGE_PERIOD: videorate->average_period_set = g_value_get_uint64 (value); break; case PROP_MAX_RATE: g_atomic_int_set (&videorate->max_rate, g_value_get_int (value)); goto reconfigure; break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (videorate); return; reconfigure: GST_OBJECT_UNLOCK (videorate); gst_base_transform_reconfigure (GST_BASE_TRANSFORM (videorate)); } static void gst_video_rate_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstVideoRate *videorate = GST_VIDEO_RATE (object); GST_OBJECT_LOCK (videorate); switch (prop_id) { case PROP_IN: g_value_set_uint64 (value, videorate->in); break; case PROP_OUT: g_value_set_uint64 (value, videorate->out); break; case PROP_DUP: g_value_set_uint64 (value, videorate->dup); break; case PROP_DROP: g_value_set_uint64 (value, videorate->drop); break; case PROP_SILENT: g_value_set_boolean (value, videorate->silent); break; case PROP_NEW_PREF: g_value_set_double (value, videorate->new_pref); break; case PROP_SKIP_TO_FIRST: g_value_set_boolean (value, videorate->skip_to_first); break; case PROP_DROP_ONLY: g_value_set_boolean (value, videorate->drop_only); break; case PROP_AVERAGE_PERIOD: g_value_set_uint64 (value, videorate->average_period_set); break; case PROP_MAX_RATE: g_value_set_int (value, g_atomic_int_get (&videorate->max_rate)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (videorate); } static gboolean plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (video_rate_debug, "videorate", 0, "VideoRate stream fixer"); return gst_element_register (plugin, "videorate", GST_RANK_NONE, GST_TYPE_VIDEO_RATE); } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "videorate", "Adjusts video frames", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)