/* 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-yuv,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 v4lsrc ! videorate ! video/x-raw-yuv,framerate=25/2 ! theoraenc ! oggmux ! filesink location=v4l.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 enum { ARG_0, ARG_IN, ARG_OUT, ARG_DUP, ARG_DROP, ARG_SILENT, ARG_NEW_PREF, ARG_SKIP_TO_FIRST /* FILL ME */ }; static GstStaticPadTemplate gst_video_rate_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw-yuv;" "video/x-raw-rgb;" "video/x-raw-gray;" "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-yuv;" "video/x-raw-rgb;" "video/x-raw-gray;" "image/jpeg;" "image/png") ); static void gst_video_rate_swap_prev (GstVideoRate * videorate, GstBuffer * buffer, gint64 time); static gboolean gst_video_rate_event (GstPad * pad, GstEvent * event); static gboolean gst_video_rate_query (GstPad * pad, GstQuery * query); static GstFlowReturn gst_video_rate_chain (GstPad * pad, GstBuffer * buffer); 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 GstStateChangeReturn gst_video_rate_change_state (GstElement * element, GstStateChange transition); /*static guint gst_video_rate_signals[LAST_SIGNAL] = { 0 }; */ 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_ELEMENT); static void gst_video_rate_class_init (GstVideoRateClass * klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); GstElementClass *element_class = GST_ELEMENT_CLASS (klass); parent_class = g_type_class_peek_parent (klass); object_class->set_property = gst_video_rate_set_property; object_class->get_property = gst_video_rate_get_property; g_object_class_install_property (object_class, ARG_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, ARG_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, ARG_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, ARG_DROP, pspec_drop); g_object_class_install_property (object_class, ARG_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, ARG_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, ARG_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)); 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)); element_class->change_state = GST_DEBUG_FUNCPTR (gst_video_rate_change_state); } /* return the caps that can be used on out_pad given in_caps on in_pad */ static gboolean gst_video_rate_transformcaps (GstPad * in_pad, GstCaps * in_caps, GstPad * out_pad, GstCaps ** out_caps) { GstCaps *intersect; const GstCaps *in_templ; gint i; GSList *extra_structures = NULL; GSList *iter; in_templ = gst_pad_get_pad_template_caps (in_pad); intersect = gst_caps_intersect (in_caps, in_templ); /* all possible framerates are allowed */ for (i = 0; i < gst_caps_get_size (intersect); i++) { GstStructure *structure; structure = gst_caps_get_structure (intersect, i); if (gst_structure_has_field (structure, "framerate")) { GstStructure *copy_structure; copy_structure = gst_structure_copy (structure); gst_structure_set (copy_structure, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL); extra_structures = g_slist_append (extra_structures, copy_structure); } } /* append the extra structures */ for (iter = extra_structures; iter != NULL; iter = g_slist_next (iter)) { gst_caps_append_structure (intersect, (GstStructure *) iter->data); } g_slist_free (extra_structures); *out_caps = intersect; return TRUE; } static GstCaps * gst_video_rate_getcaps (GstPad * pad) { GstVideoRate *videorate; GstPad *otherpad; GstCaps *caps; videorate = GST_VIDEO_RATE (GST_PAD_PARENT (pad)); otherpad = (pad == videorate->srcpad) ? videorate->sinkpad : videorate->srcpad; /* we can do what the peer can */ caps = gst_pad_peer_get_caps (otherpad); if (caps) { GstCaps *transform; gst_video_rate_transformcaps (otherpad, caps, pad, &transform); gst_caps_unref (caps); caps = transform; } else { /* no peer, our padtemplate is enough then */ caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad)); } return caps; } static gboolean gst_video_rate_setcaps (GstPad * pad, GstCaps * caps) { GstVideoRate *videorate; GstStructure *structure; gboolean ret = TRUE; GstPad *otherpad, *opeer; gint rate_numerator, rate_denominator; videorate = GST_VIDEO_RATE (gst_pad_get_parent (pad)); GST_DEBUG_OBJECT (pad, "setcaps called %" GST_PTR_FORMAT, caps); structure = gst_caps_get_structure (caps, 0); if (!gst_structure_get_fraction (structure, "framerate", &rate_numerator, &rate_denominator)) goto no_framerate; if (pad == videorate->srcpad) { /* 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; otherpad = videorate->sinkpad; } else { videorate->from_rate_numerator = rate_numerator; videorate->from_rate_denominator = rate_denominator; otherpad = videorate->srcpad; } /* now try to find something for the peer */ opeer = gst_pad_get_peer (otherpad); if (opeer) { if (gst_pad_accept_caps (opeer, caps)) { /* the peer accepts the caps as they are */ gst_pad_set_caps (otherpad, caps); ret = TRUE; } else { GstCaps *peercaps; GstCaps *transform = NULL; ret = FALSE; /* see how we can transform the input caps */ if (!gst_video_rate_transformcaps (pad, caps, otherpad, &transform)) goto no_transform; /* see what the peer can do */ peercaps = gst_pad_get_caps (opeer); GST_DEBUG_OBJECT (opeer, "icaps %" GST_PTR_FORMAT, peercaps); GST_DEBUG_OBJECT (videorate, "transform %" GST_PTR_FORMAT, transform); /* filter against our possibilities */ caps = gst_caps_intersect (peercaps, transform); gst_caps_unref (peercaps); gst_caps_unref (transform); GST_DEBUG_OBJECT (videorate, "intersect %" GST_PTR_FORMAT, caps); /* could turn up empty, due to e.g. colorspace etc */ if (gst_caps_get_size (caps) == 0) { gst_caps_unref (caps); goto no_transform; } /* take first possibility */ gst_caps_truncate (caps); structure = gst_caps_get_structure (caps, 0); /* and fixate */ gst_structure_fixate_field_nearest_fraction (structure, "framerate", rate_numerator, rate_denominator); gst_structure_get_fraction (structure, "framerate", &rate_numerator, &rate_denominator); if (otherpad == videorate->srcpad) { videorate->to_rate_numerator = rate_numerator; videorate->to_rate_denominator = rate_denominator; } else { videorate->from_rate_numerator = rate_numerator; videorate->from_rate_denominator = rate_denominator; } if (gst_structure_has_field (structure, "interlaced")) gst_structure_fixate_field_boolean (structure, "interlaced", FALSE); if (gst_structure_has_field (structure, "color-matrix")) gst_structure_fixate_field_string (structure, "color-matrix", "sdtv"); if (gst_structure_has_field (structure, "chroma-site")) gst_structure_fixate_field_string (structure, "chroma-site", "mpeg2"); if (gst_structure_has_field (structure, "pixel-aspect-ratio")) gst_structure_fixate_field_nearest_fraction (structure, "pixel-aspect-ratio", 1, 1); gst_pad_set_caps (otherpad, caps); gst_caps_unref (caps); ret = TRUE; } gst_object_unref (opeer); } 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); gst_object_unref (videorate); return ret; no_framerate: { GST_DEBUG_OBJECT (videorate, "no framerate specified"); goto done; } no_transform: { GST_DEBUG_OBJECT (videorate, "no framerate transform possible"); 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; gst_video_rate_swap_prev (videorate, NULL, 0); gst_segment_init (&videorate->segment, GST_FORMAT_TIME); } static void gst_video_rate_init (GstVideoRate * videorate) { videorate->sinkpad = gst_pad_new_from_static_template (&gst_video_rate_sink_template, "sink"); gst_pad_set_event_function (videorate->sinkpad, GST_DEBUG_FUNCPTR (gst_video_rate_event)); gst_pad_set_chain_function (videorate->sinkpad, GST_DEBUG_FUNCPTR (gst_video_rate_chain)); gst_pad_set_getcaps_function (videorate->sinkpad, GST_DEBUG_FUNCPTR (gst_video_rate_getcaps)); gst_pad_set_setcaps_function (videorate->sinkpad, GST_DEBUG_FUNCPTR (gst_video_rate_setcaps)); gst_element_add_pad (GST_ELEMENT (videorate), videorate->sinkpad); videorate->srcpad = gst_pad_new_from_static_template (&gst_video_rate_src_template, "src"); gst_pad_set_query_function (videorate->srcpad, GST_DEBUG_FUNCPTR (gst_video_rate_query)); gst_pad_set_getcaps_function (videorate->srcpad, GST_DEBUG_FUNCPTR (gst_video_rate_getcaps)); gst_pad_set_setcaps_function (videorate->srcpad, GST_DEBUG_FUNCPTR (gst_video_rate_setcaps)); gst_element_add_pad (GST_ELEMENT (videorate), videorate->srcpad); gst_video_rate_reset (videorate); videorate->silent = DEFAULT_SILENT; videorate->new_pref = DEFAULT_NEW_PREF; videorate->from_rate_numerator = 0; videorate->from_rate_denominator = 0; videorate->to_rate_numerator = 0; videorate->to_rate_denominator = 0; } /* 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.accum + 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; } /* adapt for looping, bring back to time in current segment. */ GST_BUFFER_TIMESTAMP (outbuf) = push_ts - videorate->segment.accum; gst_buffer_set_caps (outbuf, GST_PAD_CAPS (videorate->srcpad)); GST_LOG_OBJECT (videorate, "old is best, dup, pushing buffer outgoing ts %" GST_TIME_FORMAT, GST_TIME_ARGS (push_ts)); res = gst_pad_push (videorate->srcpad, 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; 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_event (GstPad * pad, GstEvent * event) { GstVideoRate *videorate; gboolean ret; videorate = GST_VIDEO_RATE (gst_pad_get_parent (pad)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT: { gint64 start, stop, time; gdouble rate, arate; gboolean update; GstFormat format; gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format, &start, &stop, &time); if (format != GST_FORMAT_TIME) goto format_error; GST_DEBUG_OBJECT (videorate, "handle NEWSEGMENT"); /* close up the previous segment, if appropriate */ if (!update && 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.accum < 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_set_newsegment_full (&videorate->segment, update, rate, arate, format, start, stop, time); 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.accum < 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.accum < 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; } ret = gst_pad_push_event (videorate->srcpad, event); done: gst_object_unref (videorate); return ret; /* ERRORS */ format_error: { GST_WARNING_OBJECT (videorate, "Got segment but doesn't have GST_FORMAT_TIME value"); gst_event_unref (event); ret = FALSE; goto done; } } static gboolean gst_video_rate_query (GstPad * pad, GstQuery * query) { GstVideoRate *videorate; gboolean res = FALSE; videorate = GST_VIDEO_RATE (gst_pad_get_parent (pad)); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_LATENCY: { GstClockTime min, max; gboolean live; guint64 latency; GstPad *peer; if ((peer = gst_pad_get_peer (videorate->sinkpad))) { 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; } default: res = gst_pad_query_default (pad, query); break; } gst_object_unref (videorate); return res; } static GstFlowReturn gst_video_rate_chain (GstPad * pad, GstBuffer * buffer) { GstVideoRate *videorate; GstFlowReturn res = GST_FLOW_OK; GstClockTime intime, in_ts, in_dur; videorate = GST_VIDEO_RATE (GST_PAD_PARENT (pad)); /* make sure the denominators are not 0 */ if (videorate->from_rate_denominator == 0 || videorate->to_rate_denominator == 0) goto not_negotiated; 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.accum; /* 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) { 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.accum; } } } 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); gst_buffer_unref (buffer); 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) { count++; /* on error the _flush function posted a warning already */ if ((res = gst_video_rate_flush_prev (videorate, count > 1)) != GST_FLOW_OK) { gst_buffer_unref (buffer); goto done; } } /* 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"); gst_buffer_unref (buffer); res = GST_FLOW_NOT_NEGOTIATED; goto done; } invalid_buffer: { GST_WARNING_OBJECT (videorate, "Got buffer with GST_CLOCK_TIME_NONE timestamp, discarding it"); gst_buffer_unref (buffer); goto done; } } static void gst_video_rate_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstVideoRate *videorate = GST_VIDEO_RATE (object); switch (prop_id) { case ARG_SILENT: videorate->silent = g_value_get_boolean (value); break; case ARG_NEW_PREF: videorate->new_pref = g_value_get_double (value); break; case ARG_SKIP_TO_FIRST: videorate->skip_to_first = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_video_rate_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstVideoRate *videorate = GST_VIDEO_RATE (object); switch (prop_id) { case ARG_IN: g_value_set_uint64 (value, videorate->in); break; case ARG_OUT: g_value_set_uint64 (value, videorate->out); break; case ARG_DUP: g_value_set_uint64 (value, videorate->dup); break; case ARG_DROP: g_value_set_uint64 (value, videorate->drop); break; case ARG_SILENT: g_value_set_boolean (value, videorate->silent); break; case ARG_NEW_PREF: g_value_set_double (value, videorate->new_pref); break; case ARG_SKIP_TO_FIRST: g_value_set_boolean (value, videorate->skip_to_first); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_video_rate_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret; GstVideoRate *videorate; videorate = GST_VIDEO_RATE (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: videorate->discont = TRUE; videorate->last_ts = -1; break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_video_rate_reset (videorate); break; default: break; } return ret; } 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)