gstreamer/gst/playondemand/gstplayondemand.c

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/* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gst/audio/audio.h>
#include "gstplayondemand.h"
/* in these files, a 'tick' is a discrete unit of time, usually around the 1ms
* range. a tick is not divisible into smaller units of time. 1ms is probably
* way beyond what a real computer can actually keep track of, but hey ... */
/* some default values */
#define GST_POD_MAX_PLAYS 100 /* maximum simultaneous plays */
#define GST_POD_BUFFER_TIME 5.0 /* buffer length in seconds */
#define GST_POD_TICK_RATE 1e-6 /* ticks per second */
/* buffer pool fallback values ... use if no buffer pool is available */
#define GST_POD_BUFPOOL_SIZE 4096
#define GST_POD_BUFPOOL_NUM 6
static GstElementDetails play_on_demand_details = {
"Play On Demand",
"Filter/Editor/Audio",
"Schedule a stream to play at specific times, or when a signal is received",
"Leif Morgan Johnson <leif@ambient.2y.net>",
};
static GstStaticPadTemplate play_on_demand_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_CAPS)
);
static GstStaticPadTemplate play_on_demand_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_CAPS)
);
/* GObject functionality */
static void play_on_demand_class_init (GstPlayOnDemandClass * klass);
static void play_on_demand_base_init (GstPlayOnDemandClass * klass);
static void play_on_demand_init (GstPlayOnDemand * filter);
static void play_on_demand_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void play_on_demand_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void play_on_demand_dispose (GObject * object);
/* GStreamer functionality */
static GstPadLinkReturn play_on_demand_pad_link (GstPad * pad,
const GstCaps * caps);
static void play_on_demand_loop (GstElement * elem);
static void play_on_demand_set_clock (GstElement * elem, GstClock * clock);
/* signal handlers */
static void play_on_demand_play_handler (GstElement * elem);
static void play_on_demand_clear_handler (GstElement * elem);
static void play_on_demand_reset_handler (GstElement * elem);
/* utility functions */
static void play_on_demand_add_play_pointer (GstPlayOnDemand * filter,
guint pos);
static void play_on_demand_resize_buffer (GstPlayOnDemand * filter);
GType
gst_play_on_demand_get_type (void)
{
static GType play_on_demand_type = 0;
if (!play_on_demand_type) {
static const GTypeInfo play_on_demand_info = {
sizeof (GstPlayOnDemandClass),
(GBaseInitFunc) play_on_demand_base_init,
NULL,
(GClassInitFunc) play_on_demand_class_init,
NULL,
NULL,
sizeof (GstPlayOnDemand),
0,
(GInstanceInitFunc) play_on_demand_init,
};
play_on_demand_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstPlayOnDemand", &play_on_demand_info, 0);
}
return play_on_demand_type;
}
/* signals and properties */
enum
{
/* add signals here */
PLAYED_SIGNAL,
STOPPED_SIGNAL,
PLAY_SIGNAL,
CLEAR_SIGNAL,
RESET_SIGNAL,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_MUTE,
PROP_BUFFER_TIME,
PROP_MAX_PLAYS,
PROP_TICK_RATE,
PROP_TOTAL_TICKS,
PROP_TICKS
};
static guint gst_pod_filter_signals[LAST_SIGNAL] = { 0 };
static GstElementClass *parent_class = NULL;
static void
play_on_demand_base_init (GstPlayOnDemandClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&play_on_demand_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&play_on_demand_sink_template));
gst_element_class_set_details (element_class, &play_on_demand_details);
}
static void
play_on_demand_class_init (GstPlayOnDemandClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gst_pod_filter_signals[PLAYED_SIGNAL] =
g_signal_new ("played", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPlayOnDemandClass, played),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_pod_filter_signals[STOPPED_SIGNAL] =
g_signal_new ("stopped", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPlayOnDemandClass, stopped),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_pod_filter_signals[PLAY_SIGNAL] =
g_signal_new ("play", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPlayOnDemandClass, play),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_pod_filter_signals[CLEAR_SIGNAL] =
g_signal_new ("clear", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPlayOnDemandClass, clear),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_pod_filter_signals[RESET_SIGNAL] =
g_signal_new ("reset", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPlayOnDemandClass, reset),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
klass->play = play_on_demand_play_handler;
klass->clear = play_on_demand_clear_handler;
klass->reset = play_on_demand_reset_handler;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->set_property = play_on_demand_set_property;
gobject_class->get_property = play_on_demand_get_property;
gobject_class->dispose = play_on_demand_dispose;
gstelement_class->set_clock = play_on_demand_set_clock;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MUTE,
g_param_spec_boolean ("mute", "Silence output", "Do not output any sound",
FALSE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BUFFER_TIME,
g_param_spec_float ("buffer-time", "Buffer length in seconds",
"Number of seconds of audio the buffer holds", 0.0, G_MAXFLOAT,
GST_POD_BUFFER_TIME, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MAX_PLAYS,
g_param_spec_uint ("max-plays", "Maximum simultaneous playbacks",
"Maximum allowed number of simultaneous plays from the buffer", 1,
G_MAXUINT, GST_POD_MAX_PLAYS, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TICK_RATE,
g_param_spec_float ("tick-rate", "Tick rate (ticks/second)",
"The rate of musical ticks, the smallest time unit in a song", 0,
G_MAXFLOAT, GST_POD_TICK_RATE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TOTAL_TICKS,
g_param_spec_uint ("total-ticks", "Total number of ticks",
"Total number of ticks in the tick array", 1, G_MAXUINT, 1,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TICKS,
g_param_spec_pointer ("ticks", "Ticks to play sample on",
"An array of ticks (musical times) at which to play the sample",
G_PARAM_READWRITE));
}
static void
play_on_demand_init (GstPlayOnDemand * filter)
{
filter->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&play_on_demand_src_template), "src");
filter->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&play_on_demand_sink_template), "sink");
gst_pad_set_link_function (filter->sinkpad, play_on_demand_pad_link);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
gst_element_set_loop_function (GST_ELEMENT (filter), play_on_demand_loop);
filter->clock = NULL;
filter->rate = 0;
filter->ticks = g_new (guint32, filter->total_ticks / 32 + 1);
filter->plays = g_new (guint, filter->max_plays);
play_on_demand_resize_buffer (filter);
play_on_demand_reset_handler (GST_ELEMENT (filter));
}
static void
play_on_demand_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPlayOnDemand *filter;
register guint i;
guint new_size, min_size, *new_plays;
guint *new_ticks;
g_return_if_fail (GST_IS_PLAYONDEMAND (object));
filter = GST_PLAYONDEMAND (object);
switch (prop_id) {
case PROP_MUTE:
filter->mute = g_value_get_boolean (value);
break;
case PROP_BUFFER_TIME:
filter->buffer_time = g_value_get_float (value);
play_on_demand_resize_buffer (filter);
/* clear out now-invalid play pointers */
for (i = 0; i < filter->max_plays; i++)
filter->plays[i] = G_MAXUINT;
break;
case PROP_MAX_PLAYS:
new_size = g_value_get_uint (value);
min_size = (new_size < filter->max_plays) ? new_size : filter->max_plays;
new_plays = g_new (guint, new_size);
for (i = 0; i < min_size; i++)
new_plays[i] = filter->plays[i];
for (i = min_size; i < new_size; i++)
new_plays[i] = G_MAXUINT;
g_free (filter->plays);
filter->plays = new_plays;
filter->max_plays = new_size;
break;
case PROP_TICK_RATE:
filter->tick_rate = g_value_get_float (value);
break;
case PROP_TOTAL_TICKS:
new_size = g_value_get_uint (value);
min_size =
(new_size < filter->total_ticks) ? new_size : filter->total_ticks;
new_ticks = g_new (guint32, new_size / 32 + 1);
for (i = 0; i <= min_size / 32; i++)
new_ticks[i] = filter->ticks[i];
for (i = min_size / 32 + 1; i <= new_size / 32; i++)
new_ticks[i] = 0;
g_free (filter->ticks);
filter->ticks = new_ticks;
filter->total_ticks = new_size;
break;
case PROP_TICKS:
new_ticks = (guint *) g_value_get_pointer (value);
if (new_ticks) {
g_free (filter->ticks);
filter->ticks = new_ticks;
}
break;
default:
break;
}
}
static void
play_on_demand_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstPlayOnDemand *filter;
g_return_if_fail (GST_IS_PLAYONDEMAND (object));
filter = GST_PLAYONDEMAND (object);
switch (prop_id) {
case PROP_MUTE:
g_value_set_boolean (value, filter->mute);
break;
case PROP_BUFFER_TIME:
g_value_set_float (value, filter->buffer_time);
break;
case PROP_MAX_PLAYS:
g_value_set_uint (value, filter->max_plays);
break;
case PROP_TICK_RATE:
g_value_set_float (value, filter->tick_rate);
break;
case PROP_TOTAL_TICKS:
g_value_set_uint (value, filter->total_ticks);
break;
case PROP_TICKS:
g_value_set_pointer (value, (gpointer) filter->ticks);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
play_on_demand_dispose (GObject * object)
{
GstPlayOnDemand *filter = GST_PLAYONDEMAND (object);
G_OBJECT_CLASS (parent_class)->dispose (object);
g_free (filter->ticks);
g_free (filter->plays);
g_free (filter->buffer);
}
static GstPadLinkReturn
play_on_demand_pad_link (GstPad * pad, const GstCaps * caps)
{
const gchar *mimetype;
GstPlayOnDemand *filter;
GstStructure *structure;
g_return_val_if_fail (caps != NULL, GST_PAD_LINK_DELAYED);
g_return_val_if_fail (pad != NULL, GST_PAD_LINK_DELAYED);
filter = GST_PLAYONDEMAND (GST_PAD_PARENT (pad));
structure = gst_caps_get_structure (caps, 0);
mimetype = gst_structure_get_name (structure);
gst_structure_get_int (structure, "rate", &filter->rate);
gst_structure_get_int (structure, "channels", &filter->channels);
if (strcmp (mimetype, "audio/x-raw-int") == 0) {
filter->format = GST_PLAYONDEMAND_FORMAT_INT;
gst_structure_get_int (structure, "width", &filter->width);
} else if (strcmp (mimetype, "audio/x-raw-float") == 0) {
filter->format = GST_PLAYONDEMAND_FORMAT_FLOAT;
}
play_on_demand_resize_buffer (filter);
return gst_pad_try_set_caps (filter->srcpad, caps);
}
inline static void
play_on_demand_add_play_pointer (GstPlayOnDemand * filter, guint pos)
{
register guint i;
if (filter->rate && ((filter->buffer_time * filter->rate) > pos)) {
for (i = 0; i < filter->max_plays; i++) {
if (filter->plays[i] == G_MAXUINT) {
filter->plays[i] = pos;
/* emit a signal to indicate a sample being played */
g_signal_emit (filter, gst_pod_filter_signals[PLAYED_SIGNAL], 0);
break;
}
}
}
}
static void
play_on_demand_loop (GstElement * elem)
{
GstPlayOnDemand *filter = GST_PLAYONDEMAND (elem);
guint num_in, num_out, num_filter;
GstData *in = NULL;
GstBuffer *out = NULL;
static guint last_tick = 0;
g_return_if_fail (filter != NULL);
g_return_if_fail (GST_IS_PLAYONDEMAND (filter));
in = (in == NULL && !filter->eos) ? gst_pad_pull (filter->sinkpad) : NULL;
if (filter->format == GST_PLAYONDEMAND_FORMAT_INT) {
if (filter->width == 16) {
gint16 min = 0xffff;
gint16 max = 0x7fff;
gint16 zero = 0;
#define _TYPE_ gint16
#include "filter.func"
#undef _TYPE_
} else if (filter->width == 8) {
gint8 min = 0xff;
gint8 max = 0x7f;
gint8 zero = 0;
#define _TYPE_ gint8
#include "filter.func"
#undef _TYPE_
}
} else if (filter->format == GST_PLAYONDEMAND_FORMAT_FLOAT) {
gfloat min = -1.0;
gfloat max = 1.0;
gfloat zero = 0.0;
#define _TYPE_ gfloat
#include "filter.func"
#undef _TYPE_
}
}
static void
play_on_demand_set_clock (GstElement * elem, GstClock * clock)
{
GstPlayOnDemand *filter;
g_return_if_fail (elem != NULL);
g_return_if_fail (GST_IS_PLAYONDEMAND (elem));
filter = GST_PLAYONDEMAND (elem);
filter->clock = clock;
}
static void
play_on_demand_play_handler (GstElement * elem)
{
GstPlayOnDemand *filter;
g_return_if_fail (elem != NULL);
g_return_if_fail (GST_IS_PLAYONDEMAND (elem));
filter = GST_PLAYONDEMAND (elem);
play_on_demand_add_play_pointer (filter, 0);
}
static void
play_on_demand_clear_handler (GstElement * elem)
{
GstPlayOnDemand *filter;
register guint i;
g_return_if_fail (elem != NULL);
g_return_if_fail (GST_IS_PLAYONDEMAND (elem));
filter = GST_PLAYONDEMAND (elem);
filter->write = 0;
filter->eos = FALSE;
for (i = 0; i < filter->max_plays; i++)
filter->plays[i] = G_MAXUINT;
for (i = 0; i < filter->buffer_bytes; i++)
filter->buffer[i] = (gchar) 0;
}
static void
play_on_demand_reset_handler (GstElement * elem)
{
GstPlayOnDemand *filter;
register guint i;
play_on_demand_clear_handler (elem);
g_return_if_fail (elem != NULL);
g_return_if_fail (GST_IS_PLAYONDEMAND (elem));
filter = GST_PLAYONDEMAND (elem);
for (i = 0; i <= filter->total_ticks / 32; i++)
filter->ticks[i] = 0;
}
static void
play_on_demand_resize_buffer (GstPlayOnDemand * filter)
{
register guint i;
guint new_size, min_size;
gchar *new_buffer;
/* use a default sample rate of 44100, 1 channel, 1 byte per sample if caps
haven't been set yet */
new_size = (guint) filter->buffer_time;
new_size *= (filter->rate) ? filter->rate : 44100;
new_size *= (filter->channels) ? filter->channels : 1;
if (filter->format && filter->format == GST_PLAYONDEMAND_FORMAT_FLOAT)
new_size *= sizeof (gfloat);
else
new_size *= (filter->width) ? filter->width / 8 : 1;
min_size =
(new_size < filter->buffer_bytes) ? new_size : filter->buffer_bytes;
new_buffer = g_new (gchar, new_size);
for (i = 0; i < min_size; i++)
new_buffer[i] = filter->buffer[i];
for (i = min_size; i < new_size; i++)
new_buffer[i] = (gchar) 0;
g_free (filter->buffer);
filter->buffer = new_buffer;
filter->buffer_bytes = new_size;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "playondemand",
GST_RANK_NONE, GST_TYPE_PLAYONDEMAND);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"playondemand",
"Plays a stream at specific times, or when it receives a signal",
plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)