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576 lines
16 KiB
C
576 lines
16 KiB
C
/* gstmonoscope.c: implementation of monoscope drawing element
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* Copyright (C) <2002> Richard Boulton <richard@tartarus.org>
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* Copyright (C) <2006> Tim-Philipp Müller <tim centricular net>
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* Copyright (C) <2006> Wim Taymans <wim at fluendo dot com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-monoscope
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* @see_also: goom
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*
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* Monoscope is an audio visualisation element. It creates a coloured
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* curve of the audio signal like on an oscilloscope.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch-1.0 -v audiotestsrc ! audioconvert ! monoscope ! videoconvert ! ximagesink
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* ]|
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/video/video.h>
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#include <gst/audio/audio.h>
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#include <string.h>
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#include "gstmonoscope.h"
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#include "monoscope.h"
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GST_DEBUG_CATEGORY_STATIC (monoscope_debug);
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#define GST_CAT_DEFAULT monoscope_debug
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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GST_STATIC_CAPS ("video/x-raw, "
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"format = (string) xRGB, "
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"width = 256, " "height = 128, " "framerate = " GST_VIDEO_FPS_RANGE)
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#else
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GST_STATIC_CAPS ("video/x-raw, "
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"format = (string) BGRx, "
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"width = 256, " "height = 128, " "framerate = " GST_VIDEO_FPS_RANGE)
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#endif
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);
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw, "
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"format = (string) " GST_AUDIO_NE (S16) ", "
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"rate = (int) [ 8000, 96000 ], "
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"channels = (int) 1, " "layout = (string) interleaved")
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);
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#define gst_monoscope_parent_class parent_class
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G_DEFINE_TYPE (GstMonoscope, gst_monoscope, GST_TYPE_ELEMENT);
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static void gst_monoscope_finalize (GObject * object);
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static GstFlowReturn gst_monoscope_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buf);
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static gboolean gst_monoscope_src_setcaps (GstMonoscope * mono, GstCaps * caps);
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static gboolean gst_monoscope_sink_setcaps (GstMonoscope * mono,
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GstCaps * caps);
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static void gst_monoscope_reset (GstMonoscope * monoscope);
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static gboolean gst_monoscope_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_monoscope_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstStateChangeReturn gst_monoscope_change_state (GstElement * element,
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GstStateChange transition);
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static void
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gst_monoscope_class_init (GstMonoscopeClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gobject_class->finalize = gst_monoscope_finalize;
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_monoscope_change_state);
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_set_static_metadata (gstelement_class, "Monoscope",
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"Visualization",
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"Displays a highly stabilised waveform of audio input",
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"Richard Boulton <richard@tartarus.org>");
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}
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static void
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gst_monoscope_init (GstMonoscope * monoscope)
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{
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monoscope->sinkpad =
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gst_pad_new_from_static_template (&sink_template, "sink");
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gst_pad_set_chain_function (monoscope->sinkpad,
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GST_DEBUG_FUNCPTR (gst_monoscope_chain));
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gst_pad_set_event_function (monoscope->sinkpad,
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GST_DEBUG_FUNCPTR (gst_monoscope_sink_event));
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gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->sinkpad);
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monoscope->srcpad = gst_pad_new_from_static_template (&src_template, "src");
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gst_pad_set_event_function (monoscope->srcpad,
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GST_DEBUG_FUNCPTR (gst_monoscope_src_event));
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gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->srcpad);
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monoscope->adapter = gst_adapter_new ();
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monoscope->next_ts = GST_CLOCK_TIME_NONE;
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monoscope->bps = sizeof (gint16);
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/* reset the initial video state */
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monoscope->width = 256;
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monoscope->height = 128;
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monoscope->fps_num = 25; /* desired frame rate */
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monoscope->fps_denom = 1;
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monoscope->visstate = NULL;
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/* reset the initial audio state */
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monoscope->rate = GST_AUDIO_DEF_RATE;
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}
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static void
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gst_monoscope_finalize (GObject * object)
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{
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GstMonoscope *monoscope = GST_MONOSCOPE (object);
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if (monoscope->visstate)
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monoscope_close (monoscope->visstate);
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g_object_unref (monoscope->adapter);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_monoscope_reset (GstMonoscope * monoscope)
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{
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monoscope->next_ts = GST_CLOCK_TIME_NONE;
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gst_adapter_clear (monoscope->adapter);
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gst_segment_init (&monoscope->segment, GST_FORMAT_UNDEFINED);
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GST_OBJECT_LOCK (monoscope);
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monoscope->proportion = 1.0;
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monoscope->earliest_time = -1;
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GST_OBJECT_UNLOCK (monoscope);
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}
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static gboolean
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gst_monoscope_sink_setcaps (GstMonoscope * monoscope, GstCaps * caps)
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{
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GstStructure *structure;
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (structure, "rate", &monoscope->rate);
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GST_DEBUG_OBJECT (monoscope, "sample rate = %d", monoscope->rate);
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return TRUE;
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}
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static gboolean
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gst_monoscope_src_setcaps (GstMonoscope * monoscope, GstCaps * caps)
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{
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GstStructure *structure;
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gboolean res;
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (structure, "width", &monoscope->width);
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gst_structure_get_int (structure, "height", &monoscope->height);
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gst_structure_get_fraction (structure, "framerate", &monoscope->fps_num,
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&monoscope->fps_denom);
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monoscope->outsize = monoscope->width * monoscope->height * 4;
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monoscope->frame_duration = gst_util_uint64_scale_int (GST_SECOND,
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monoscope->fps_denom, monoscope->fps_num);
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monoscope->spf =
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gst_util_uint64_scale_int (monoscope->rate, monoscope->fps_denom,
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monoscope->fps_num);
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GST_DEBUG_OBJECT (monoscope, "dimension %dx%d, framerate %d/%d, spf %d",
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monoscope->width, monoscope->height, monoscope->fps_num,
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monoscope->fps_denom, monoscope->spf);
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if (monoscope->visstate) {
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monoscope_close (monoscope->visstate);
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monoscope->visstate = NULL;
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}
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monoscope->visstate = monoscope_init (monoscope->width, monoscope->height);
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res = gst_pad_set_caps (monoscope->srcpad, caps);
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return res && (monoscope->visstate != NULL);
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}
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static gboolean
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gst_monoscope_src_negotiate (GstMonoscope * monoscope)
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{
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GstCaps *othercaps, *target;
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GstStructure *structure;
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GstCaps *templ;
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GstQuery *query;
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GstBufferPool *pool;
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GstStructure *config;
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guint size, min, max;
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templ = gst_pad_get_pad_template_caps (monoscope->srcpad);
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GST_DEBUG_OBJECT (monoscope, "performing negotiation");
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/* see what the peer can do */
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othercaps = gst_pad_peer_query_caps (monoscope->srcpad, NULL);
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if (othercaps) {
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target = gst_caps_intersect (othercaps, templ);
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gst_caps_unref (othercaps);
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gst_caps_unref (templ);
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if (gst_caps_is_empty (target))
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goto no_format;
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target = gst_caps_truncate (target);
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} else {
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target = templ;
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}
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target = gst_caps_make_writable (target);
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structure = gst_caps_get_structure (target, 0);
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gst_structure_fixate_field_nearest_int (structure, "width", 320);
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gst_structure_fixate_field_nearest_int (structure, "height", 240);
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gst_structure_fixate_field_nearest_fraction (structure, "framerate", 25, 1);
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gst_monoscope_src_setcaps (monoscope, target);
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/* try to get a bufferpool now */
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/* find a pool for the negotiated caps now */
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query = gst_query_new_allocation (target, TRUE);
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if (!gst_pad_peer_query (monoscope->srcpad, query)) {
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}
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if (gst_query_get_n_allocation_pools (query) > 0) {
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/* we got configuration from our peer, parse them */
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gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
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} else {
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pool = NULL;
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size = monoscope->outsize;
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min = max = 0;
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}
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if (pool == NULL) {
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/* we did not get a pool, make one ourselves then */
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pool = gst_buffer_pool_new ();
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}
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config = gst_buffer_pool_get_config (pool);
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gst_buffer_pool_config_set_params (config, target, size, min, max);
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gst_buffer_pool_set_config (pool, config);
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if (monoscope->pool) {
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gst_buffer_pool_set_active (monoscope->pool, TRUE);
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gst_object_unref (monoscope->pool);
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}
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monoscope->pool = pool;
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/* and activate */
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gst_buffer_pool_set_active (pool, TRUE);
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gst_caps_unref (target);
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return TRUE;
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no_format:
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{
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gst_caps_unref (target);
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return FALSE;
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}
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}
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/* make sure we are negotiated */
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static GstFlowReturn
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ensure_negotiated (GstMonoscope * monoscope)
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{
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gboolean reconfigure;
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reconfigure = gst_pad_check_reconfigure (monoscope->srcpad);
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/* we don't know an output format yet, pick one */
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if (reconfigure || !gst_pad_has_current_caps (monoscope->srcpad)) {
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if (!gst_monoscope_src_negotiate (monoscope))
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return GST_FLOW_NOT_NEGOTIATED;
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}
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return GST_FLOW_OK;
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}
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static GstFlowReturn
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gst_monoscope_chain (GstPad * pad, GstObject * parent, GstBuffer * inbuf)
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{
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GstFlowReturn flow_ret = GST_FLOW_OK;
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GstMonoscope *monoscope;
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monoscope = GST_MONOSCOPE (parent);
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if (monoscope->rate == 0) {
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gst_buffer_unref (inbuf);
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flow_ret = GST_FLOW_NOT_NEGOTIATED;
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goto out;
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}
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/* Make sure have an output format */
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flow_ret = ensure_negotiated (monoscope);
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if (flow_ret != GST_FLOW_OK) {
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gst_buffer_unref (inbuf);
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goto out;
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}
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/* don't try to combine samples from discont buffer */
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if (GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_DISCONT)) {
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gst_adapter_clear (monoscope->adapter);
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monoscope->next_ts = GST_CLOCK_TIME_NONE;
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}
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/* Match timestamps from the incoming audio */
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if (GST_BUFFER_TIMESTAMP (inbuf) != GST_CLOCK_TIME_NONE)
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monoscope->next_ts = GST_BUFFER_TIMESTAMP (inbuf);
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GST_LOG_OBJECT (monoscope,
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"in buffer has %" G_GSIZE_FORMAT " samples, ts=%" GST_TIME_FORMAT,
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gst_buffer_get_size (inbuf) / monoscope->bps,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (inbuf)));
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gst_adapter_push (monoscope->adapter, inbuf);
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inbuf = NULL;
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/* Collect samples until we have enough for an output frame */
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while (flow_ret == GST_FLOW_OK) {
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gint16 *samples;
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GstBuffer *outbuf = NULL;
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guint32 *pixels, avail, bytesperframe;
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avail = gst_adapter_available (monoscope->adapter);
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GST_LOG_OBJECT (monoscope, "bytes avail now %u", avail);
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bytesperframe = monoscope->spf * monoscope->bps;
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if (avail < bytesperframe)
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break;
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/* FIXME: something is wrong with QoS, we are skipping way too much
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* stuff even with very low CPU loads */
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#if 0
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if (monoscope->next_ts != -1) {
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gboolean need_skip;
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gint64 qostime;
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qostime = gst_segment_to_running_time (&monoscope->segment,
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GST_FORMAT_TIME, monoscope->next_ts);
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GST_OBJECT_LOCK (monoscope);
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/* check for QoS, don't compute buffers that are known to be late */
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need_skip =
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GST_CLOCK_TIME_IS_VALID (monoscope->earliest_time) &&
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qostime <= monoscope->earliest_time;
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GST_OBJECT_UNLOCK (monoscope);
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if (need_skip) {
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GST_WARNING_OBJECT (monoscope,
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"QoS: skip ts: %" GST_TIME_FORMAT ", earliest: %" GST_TIME_FORMAT,
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GST_TIME_ARGS (qostime), GST_TIME_ARGS (monoscope->earliest_time));
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goto skip;
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}
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}
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#endif
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samples = (gint16 *) gst_adapter_map (monoscope->adapter, bytesperframe);
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if (monoscope->spf < 512) {
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gint16 in_data[512], i;
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for (i = 0; i < 512; ++i) {
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gdouble off;
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off = ((gdouble) i * (gdouble) monoscope->spf) / 512.0;
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in_data[i] = samples[MIN ((guint) off, monoscope->spf)];
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}
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pixels = monoscope_update (monoscope->visstate, in_data);
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} else {
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/* not really correct, but looks much prettier */
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pixels = monoscope_update (monoscope->visstate, samples);
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}
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GST_LOG_OBJECT (monoscope, "allocating output buffer");
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flow_ret = gst_buffer_pool_acquire_buffer (monoscope->pool, &outbuf, NULL);
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if (flow_ret != GST_FLOW_OK) {
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gst_adapter_unmap (monoscope->adapter);
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goto out;
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}
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gst_buffer_fill (outbuf, 0, pixels, monoscope->outsize);
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GST_BUFFER_TIMESTAMP (outbuf) = monoscope->next_ts;
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GST_BUFFER_DURATION (outbuf) = monoscope->frame_duration;
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flow_ret = gst_pad_push (monoscope->srcpad, outbuf);
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#if 0
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skip:
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#endif
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if (GST_CLOCK_TIME_IS_VALID (monoscope->next_ts))
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monoscope->next_ts += monoscope->frame_duration;
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gst_adapter_flush (monoscope->adapter, bytesperframe);
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}
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out:
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return flow_ret;
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}
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static gboolean
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gst_monoscope_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstMonoscope *monoscope;
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gboolean res;
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monoscope = GST_MONOSCOPE (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_START:
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res = gst_pad_push_event (monoscope->srcpad, event);
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break;
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case GST_EVENT_FLUSH_STOP:
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gst_monoscope_reset (monoscope);
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res = gst_pad_push_event (monoscope->srcpad, event);
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break;
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case GST_EVENT_SEGMENT:
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{
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/* the newsegment values are used to clip the input samples
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* and to convert the incomming timestamps to running time so
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* we can do QoS */
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gst_event_copy_segment (event, &monoscope->segment);
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res = gst_pad_push_event (monoscope->srcpad, event);
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break;
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}
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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gst_event_parse_caps (event, &caps);
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gst_monoscope_sink_setcaps (monoscope, caps);
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gst_event_unref (event);
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res = TRUE;
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break;
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}
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default:
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res = gst_pad_push_event (monoscope->srcpad, event);
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break;
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}
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return res;
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}
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|
static gboolean
|
|
gst_monoscope_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
|
|
{
|
|
GstMonoscope *monoscope;
|
|
gboolean res;
|
|
|
|
monoscope = GST_MONOSCOPE (parent);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_QOS:{
|
|
gdouble proportion;
|
|
GstClockTimeDiff diff;
|
|
GstClockTime timestamp;
|
|
|
|
gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
|
|
|
|
/* save stuff for the _chain() function */
|
|
GST_OBJECT_LOCK (monoscope);
|
|
monoscope->proportion = proportion;
|
|
if (diff >= 0)
|
|
/* we're late, this is a good estimate for next displayable
|
|
* frame (see part-qos.txt) */
|
|
monoscope->earliest_time =
|
|
timestamp + 2 * diff + monoscope->frame_duration;
|
|
else
|
|
monoscope->earliest_time = timestamp + diff;
|
|
GST_OBJECT_UNLOCK (monoscope);
|
|
|
|
res = gst_pad_push_event (monoscope->sinkpad, event);
|
|
break;
|
|
}
|
|
default:
|
|
res = gst_pad_push_event (monoscope->sinkpad, event);
|
|
break;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_monoscope_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstMonoscope *monoscope = GST_MONOSCOPE (element);
|
|
GstStateChangeReturn ret;
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
gst_monoscope_reset (monoscope);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
if (monoscope->pool) {
|
|
gst_buffer_pool_set_active (monoscope->pool, FALSE);
|
|
gst_object_replace ((GstObject **) & monoscope->pool, NULL);
|
|
}
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
plugin_init (GstPlugin * plugin)
|
|
{
|
|
GST_DEBUG_CATEGORY_INIT (monoscope_debug, "monoscope", 0,
|
|
"monoscope element");
|
|
|
|
return gst_element_register (plugin, "monoscope",
|
|
GST_RANK_NONE, GST_TYPE_MONOSCOPE);
|
|
}
|
|
|
|
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
monoscope,
|
|
"Monoscope visualization",
|
|
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
|