gstreamer/gst/monoscope/gstmonoscope.c
Sebastian Dröge a65a7ec05b monoscope: Forward the SEGMENT event from the chain function
Otherwise we'll break the event order and forward the SEGMENT event
before sending a CAPS event.
2018-02-18 21:38:13 +01:00

593 lines
17 KiB
C

/* gstmonoscope.c: implementation of monoscope drawing element
* Copyright (C) <2002> Richard Boulton <richard@tartarus.org>
* Copyright (C) <2006> Tim-Philipp Müller <tim centricular net>
* Copyright (C) <2006> Wim Taymans <wim at fluendo dot com>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-monoscope
* @see_also: goom
*
* Monoscope is an audio visualisation element. It creates a coloured
* curve of the audio signal like on an oscilloscope.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v audiotestsrc ! audioconvert ! monoscope ! videoconvert ! ximagesink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/video/video.h>
#include <gst/audio/audio.h>
#include <string.h>
#include "gstmonoscope.h"
#include "monoscope.h"
GST_DEBUG_CATEGORY_STATIC (monoscope_debug);
#define GST_CAT_DEFAULT monoscope_debug
#if G_BYTE_ORDER == G_BIG_ENDIAN
#define RGB_ORDER "xRGB"
#else
#define RGB_ORDER "BGRx"
#endif
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw, "
"format = (string) " RGB_ORDER ", "
"width = " G_STRINGIFY (scope_width) ", "
"height = " G_STRINGIFY (scope_height) ", "
"framerate = " GST_VIDEO_FPS_RANGE)
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) " GST_AUDIO_NE (S16) ", "
"rate = (int) [ 8000, 96000 ], "
"channels = (int) 1, " "layout = (string) interleaved")
);
#define gst_monoscope_parent_class parent_class
G_DEFINE_TYPE (GstMonoscope, gst_monoscope, GST_TYPE_ELEMENT);
static void gst_monoscope_finalize (GObject * object);
static GstFlowReturn gst_monoscope_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean gst_monoscope_src_setcaps (GstMonoscope * mono, GstCaps * caps);
static gboolean gst_monoscope_sink_setcaps (GstMonoscope * mono,
GstCaps * caps);
static void gst_monoscope_reset (GstMonoscope * monoscope);
static gboolean gst_monoscope_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_monoscope_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstStateChangeReturn gst_monoscope_change_state (GstElement * element,
GstStateChange transition);
static void
gst_monoscope_class_init (GstMonoscopeClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_monoscope_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_monoscope_change_state);
gst_element_class_add_static_pad_template (gstelement_class, &src_template);
gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
gst_element_class_set_static_metadata (gstelement_class, "Monoscope",
"Visualization",
"Displays a highly stabilised waveform of audio input",
"Richard Boulton <richard@tartarus.org>");
}
static void
gst_monoscope_init (GstMonoscope * monoscope)
{
monoscope->sinkpad =
gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (monoscope->sinkpad,
GST_DEBUG_FUNCPTR (gst_monoscope_chain));
gst_pad_set_event_function (monoscope->sinkpad,
GST_DEBUG_FUNCPTR (gst_monoscope_sink_event));
gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->sinkpad);
monoscope->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_set_event_function (monoscope->srcpad,
GST_DEBUG_FUNCPTR (gst_monoscope_src_event));
gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->srcpad);
monoscope->adapter = gst_adapter_new ();
monoscope->next_ts = GST_CLOCK_TIME_NONE;
monoscope->bps = sizeof (gint16);
/* reset the initial video state */
monoscope->width = scope_width;
monoscope->height = scope_height;
monoscope->fps_num = 25; /* desired frame rate */
monoscope->fps_denom = 1;
monoscope->visstate = NULL;
/* reset the initial audio state */
monoscope->rate = GST_AUDIO_DEF_RATE;
}
static void
gst_monoscope_finalize (GObject * object)
{
GstMonoscope *monoscope = GST_MONOSCOPE (object);
if (monoscope->visstate)
monoscope_close (monoscope->visstate);
g_object_unref (monoscope->adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_monoscope_reset (GstMonoscope * monoscope)
{
monoscope->next_ts = GST_CLOCK_TIME_NONE;
gst_adapter_clear (monoscope->adapter);
gst_segment_init (&monoscope->segment, GST_FORMAT_UNDEFINED);
monoscope->segment_pending = FALSE;
GST_OBJECT_LOCK (monoscope);
monoscope->proportion = 1.0;
monoscope->earliest_time = -1;
GST_OBJECT_UNLOCK (monoscope);
}
static gboolean
gst_monoscope_sink_setcaps (GstMonoscope * monoscope, GstCaps * caps)
{
GstStructure *structure;
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "rate", &monoscope->rate);
GST_DEBUG_OBJECT (monoscope, "sample rate = %d", monoscope->rate);
return TRUE;
}
static gboolean
gst_monoscope_src_setcaps (GstMonoscope * monoscope, GstCaps * caps)
{
GstStructure *structure;
gboolean res;
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "width", &monoscope->width);
gst_structure_get_int (structure, "height", &monoscope->height);
gst_structure_get_fraction (structure, "framerate", &monoscope->fps_num,
&monoscope->fps_denom);
monoscope->outsize = monoscope->width * monoscope->height * 4;
monoscope->frame_duration = gst_util_uint64_scale_int (GST_SECOND,
monoscope->fps_denom, monoscope->fps_num);
monoscope->spf =
gst_util_uint64_scale_int (monoscope->rate, monoscope->fps_denom,
monoscope->fps_num);
GST_DEBUG_OBJECT (monoscope, "dimension %dx%d, framerate %d/%d, spf %d",
monoscope->width, monoscope->height, monoscope->fps_num,
monoscope->fps_denom, monoscope->spf);
if (monoscope->visstate) {
monoscope_close (monoscope->visstate);
monoscope->visstate = NULL;
}
monoscope->visstate = monoscope_init (monoscope->width, monoscope->height);
res = gst_pad_set_caps (monoscope->srcpad, caps);
return res && (monoscope->visstate != NULL);
}
static gboolean
gst_monoscope_src_negotiate (GstMonoscope * monoscope)
{
GstCaps *othercaps, *target;
GstStructure *structure;
GstCaps *templ;
GstQuery *query;
GstBufferPool *pool;
GstStructure *config;
guint size, min, max;
templ = gst_pad_get_pad_template_caps (monoscope->srcpad);
GST_DEBUG_OBJECT (monoscope, "performing negotiation");
/* see what the peer can do */
othercaps = gst_pad_peer_query_caps (monoscope->srcpad, NULL);
if (othercaps) {
target = gst_caps_intersect (othercaps, templ);
gst_caps_unref (othercaps);
gst_caps_unref (templ);
if (gst_caps_is_empty (target))
goto no_format;
target = gst_caps_truncate (target);
} else {
target = templ;
}
target = gst_caps_make_writable (target);
structure = gst_caps_get_structure (target, 0);
gst_structure_fixate_field_nearest_int (structure, "width", 320);
gst_structure_fixate_field_nearest_int (structure, "height", 240);
gst_structure_fixate_field_nearest_fraction (structure, "framerate", 25, 1);
gst_monoscope_src_setcaps (monoscope, target);
/* try to get a bufferpool now */
/* find a pool for the negotiated caps now */
query = gst_query_new_allocation (target, TRUE);
if (!gst_pad_peer_query (monoscope->srcpad, query)) {
}
if (gst_query_get_n_allocation_pools (query) > 0) {
/* we got configuration from our peer, parse them */
gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
} else {
pool = NULL;
size = monoscope->outsize;
min = max = 0;
}
if (pool == NULL) {
/* we did not get a pool, make one ourselves then */
pool = gst_buffer_pool_new ();
}
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, target, size, min, max);
gst_buffer_pool_set_config (pool, config);
if (monoscope->pool) {
gst_buffer_pool_set_active (monoscope->pool, TRUE);
gst_object_unref (monoscope->pool);
}
monoscope->pool = pool;
/* and activate */
gst_buffer_pool_set_active (pool, TRUE);
gst_query_unref (query);
gst_caps_unref (target);
return TRUE;
no_format:
{
gst_caps_unref (target);
return FALSE;
}
}
/* make sure we are negotiated */
static GstFlowReturn
ensure_negotiated (GstMonoscope * monoscope)
{
gboolean reconfigure;
reconfigure = gst_pad_check_reconfigure (monoscope->srcpad);
/* we don't know an output format yet, pick one */
if (reconfigure || !gst_pad_has_current_caps (monoscope->srcpad)) {
if (!gst_monoscope_src_negotiate (monoscope)) {
gst_pad_mark_reconfigure (monoscope->srcpad);
if (GST_PAD_IS_FLUSHING (monoscope->srcpad))
return GST_FLOW_FLUSHING;
else
return GST_FLOW_NOT_NEGOTIATED;
}
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_monoscope_chain (GstPad * pad, GstObject * parent, GstBuffer * inbuf)
{
GstFlowReturn flow_ret = GST_FLOW_OK;
GstMonoscope *monoscope;
monoscope = GST_MONOSCOPE (parent);
if (monoscope->rate == 0) {
gst_buffer_unref (inbuf);
flow_ret = GST_FLOW_NOT_NEGOTIATED;
goto out;
}
/* Make sure have an output format */
flow_ret = ensure_negotiated (monoscope);
if (flow_ret != GST_FLOW_OK) {
gst_buffer_unref (inbuf);
goto out;
}
if (monoscope->segment_pending) {
gst_pad_push_event (monoscope->srcpad,
gst_event_new_segment (&monoscope->segment));
monoscope->segment_pending = FALSE;
}
/* don't try to combine samples from discont buffer */
if (GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_DISCONT)) {
gst_adapter_clear (monoscope->adapter);
monoscope->next_ts = GST_CLOCK_TIME_NONE;
}
/* Match timestamps from the incoming audio */
if (GST_BUFFER_TIMESTAMP (inbuf) != GST_CLOCK_TIME_NONE)
monoscope->next_ts = GST_BUFFER_TIMESTAMP (inbuf);
GST_LOG_OBJECT (monoscope,
"in buffer has %" G_GSIZE_FORMAT " samples, ts=%" GST_TIME_FORMAT,
gst_buffer_get_size (inbuf) / monoscope->bps,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (inbuf)));
gst_adapter_push (monoscope->adapter, inbuf);
inbuf = NULL;
/* Collect samples until we have enough for an output frame */
while (flow_ret == GST_FLOW_OK) {
gint16 *samples;
GstBuffer *outbuf = NULL;
guint32 *pixels, avail, bytesperframe;
avail = gst_adapter_available (monoscope->adapter);
GST_LOG_OBJECT (monoscope, "bytes avail now %u", avail);
bytesperframe = monoscope->spf * monoscope->bps;
if (avail < bytesperframe)
break;
/* FIXME: something is wrong with QoS, we are skipping way too much
* stuff even with very low CPU loads */
#if 0
if (monoscope->next_ts != -1) {
gboolean need_skip;
gint64 qostime;
qostime = gst_segment_to_running_time (&monoscope->segment,
GST_FORMAT_TIME, monoscope->next_ts);
GST_OBJECT_LOCK (monoscope);
/* check for QoS, don't compute buffers that are known to be late */
need_skip =
GST_CLOCK_TIME_IS_VALID (monoscope->earliest_time) &&
qostime <= monoscope->earliest_time;
GST_OBJECT_UNLOCK (monoscope);
if (need_skip) {
GST_WARNING_OBJECT (monoscope,
"QoS: skip ts: %" GST_TIME_FORMAT ", earliest: %" GST_TIME_FORMAT,
GST_TIME_ARGS (qostime), GST_TIME_ARGS (monoscope->earliest_time));
goto skip;
}
}
#endif
samples = (gint16 *) gst_adapter_map (monoscope->adapter, bytesperframe);
if (monoscope->spf < convolver_big) {
gint16 in_data[convolver_big], i;
gdouble scale = (gdouble) monoscope->spf / (gdouble) convolver_big;
for (i = 0; i < convolver_big; ++i) {
gdouble off = (gdouble) i * scale;
in_data[i] = samples[MIN ((guint) off, monoscope->spf)];
}
pixels = monoscope_update (monoscope->visstate, in_data);
} else {
/* not really correct, but looks much prettier */
pixels = monoscope_update (monoscope->visstate, samples);
}
GST_LOG_OBJECT (monoscope, "allocating output buffer");
flow_ret = gst_buffer_pool_acquire_buffer (monoscope->pool, &outbuf, NULL);
if (flow_ret != GST_FLOW_OK) {
gst_adapter_unmap (monoscope->adapter);
goto out;
}
gst_buffer_fill (outbuf, 0, pixels, monoscope->outsize);
GST_BUFFER_TIMESTAMP (outbuf) = monoscope->next_ts;
GST_BUFFER_DURATION (outbuf) = monoscope->frame_duration;
flow_ret = gst_pad_push (monoscope->srcpad, outbuf);
#if 0
skip:
#endif
if (GST_CLOCK_TIME_IS_VALID (monoscope->next_ts))
monoscope->next_ts += monoscope->frame_duration;
gst_adapter_flush (monoscope->adapter, bytesperframe);
}
out:
return flow_ret;
}
static gboolean
gst_monoscope_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstMonoscope *monoscope;
gboolean res;
monoscope = GST_MONOSCOPE (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
res = gst_pad_push_event (monoscope->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_monoscope_reset (monoscope);
res = gst_pad_push_event (monoscope->srcpad, event);
break;
case GST_EVENT_SEGMENT:
{
/* the newsegment values are used to clip the input samples
* and to convert the incomming timestamps to running time so
* we can do QoS */
gst_event_copy_segment (event, &monoscope->segment);
/* We forward the event from the chain function after caps are
* negotiated. Otherwise we would potentially break the event order and
* send the segment event before the caps event */
monoscope->segment_pending = TRUE;
gst_event_unref (event);
res = TRUE;
break;
}
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
gst_monoscope_sink_setcaps (monoscope, caps);
gst_event_unref (event);
res = TRUE;
break;
}
default:
res = gst_pad_push_event (monoscope->srcpad, event);
break;
}
return res;
}
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, &timestamp);
/* 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);