gstreamer/gst/adder/gstadder.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
* 2001 Thomas <thomas@apestaart.org>
*
* adder.c: Adder element, N in, one out, samples are added
*
* 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.
*/
#include "gstadder.h"
#include <gst/audio/audio.h>
#include <string.h> /* strcmp */
#define GST_ADDER_BUFFER_SIZE 4096
#define GST_ADDER_NUM_BUFFERS 8
/* elementfactory information */
GstElementDetails adder_details = {
"Adder",
"Filter/Audio",
"LGPL",
"N-to-1 audio adder/mixer",
VERSION,
"Thomas <thomas@apestaart.org>",
"(C) 2001, 2002",
};
/* Adder signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_NUM_PADS,
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (gst_adder_src_template_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
gst_caps_new ("int_src", "audio/raw",
GST_AUDIO_INT_PAD_TEMPLATE_PROPS),
gst_caps_new ("float_src", "audio/raw",
GST_AUDIO_FLOAT_MONO_PAD_TEMPLATE_PROPS)
);
GST_PAD_TEMPLATE_FACTORY (gst_adder_sink_template_factory,
"sink%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
gst_caps_new ("int_sink", "audio/raw",
GST_AUDIO_INT_PAD_TEMPLATE_PROPS),
gst_caps_new ("float_sink", "audio/raw",
GST_AUDIO_FLOAT_MONO_PAD_TEMPLATE_PROPS)
);
static void gst_adder_class_init (GstAdderClass *klass);
static void gst_adder_init (GstAdder *adder);
static void gst_adder_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstPad* gst_adder_request_new_pad (GstElement *element, GstPadTemplate *temp,
const gchar *unused);
static GstElementStateReturn
gst_adder_change_state (GstElement *element);
/* we do need a loop function */
static void gst_adder_loop (GstElement *element);
static GstElementClass *parent_class = NULL;
/* static guint gst_adder_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_adder_get_type (void) {
static GType adder_type = 0;
if (!adder_type) {
static const GTypeInfo adder_info = {
sizeof (GstAdderClass), NULL, NULL,
(GClassInitFunc) gst_adder_class_init, NULL, NULL,
sizeof (GstAdder), 0,
(GInstanceInitFunc) gst_adder_init,
};
adder_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAdder",
&adder_info, 0);
}
return adder_type;
}
static gboolean
gst_adder_parse_caps (GstAdder *adder, GstCaps *caps)
{
const gchar *format;
GstElement *el = GST_ELEMENT (adder);
gst_caps_get_string (caps, "format", &format);
if (adder->format == GST_ADDER_FORMAT_UNSET) {
/* the caps haven't been set yet at all,
* so we need to go ahead and set all
the relevant values. */
if (strcmp (format, "int") == 0) {
GST_DEBUG (GST_CAT_PLUGIN_INFO, "parse_caps sets adder to format int");
adder->format = GST_ADDER_FORMAT_INT;
gst_caps_get_int (caps, "width", &adder->width);
gst_caps_get_int (caps, "depth", &adder->depth);
gst_caps_get_int (caps, "law", &adder->law);
gst_caps_get_int (caps, "endianness", &adder->endianness);
gst_caps_get_boolean (caps, "signed", &adder->is_signed);
gst_caps_get_int (caps, "channels", &adder->channels);
gst_caps_get_int (caps, "rate", &adder->rate);
} else if (strcmp (format, "float") == 0) {
GST_DEBUG (GST_CAT_PLUGIN_INFO, "parse_caps sets adder to format float");
adder->format = GST_ADDER_FORMAT_FLOAT;
gst_caps_get_string (caps, "layout", &adder->layout);
gst_caps_get_float (caps, "intercept", &adder->intercept);
gst_caps_get_float (caps, "slope", &adder->slope);
gst_caps_get_int (caps, "channels", &adder->channels);
gst_caps_get_int (caps, "rate", &adder->rate);
}
} else {
/* otherwise, a previously-linked pad has set all the values. we should
barf if some of the attempted new values don't match. */
if (strcmp (format, "int") == 0) {
gint width, channels, rate;
gboolean is_signed;
gst_caps_get_int (caps, "width", &width);
gst_caps_get_int (caps, "channels", &channels);
gst_caps_get_boolean (caps, "signed", &is_signed);
gst_caps_get_int (caps, "rate", &rate);
/* provide an error message if we can't link */
if (adder->format != GST_ADDER_FORMAT_INT) {
gst_element_error (el, "can't link a non-int pad to an int adder");
return FALSE;
}
if (adder->channels != channels) {
gst_element_error (el,
"can't link %d-channel pad with %d-channel adder",
channels, adder->channels);
return FALSE;
}
if (adder->rate != rate) {
gst_element_error (el, "can't link %d Hz pad with %d Hz adder",
rate, adder->rate);
return FALSE;
}
if (adder->width != width) {
gst_element_error (el, "can't link %d-bit pad with %d-bit adder",
width, adder->width);
return FALSE;
}
if (adder->is_signed != is_signed) {
gst_element_error (el,
"can't link %ssigned pad with %ssigned adder",
adder->is_signed ? "" : "un",
is_signed ? "" : "un");
return FALSE;
}
} else if (strcmp (format, "float") == 0) {
gint channels, rate;
gst_caps_get_int (caps, "channels", &channels);
gst_caps_get_int (caps, "rate", &rate);
if (adder->format != GST_ADDER_FORMAT_FLOAT) {
gst_element_error (el,
"can't link a non-float pad to a float adder");
return FALSE;
}
if (adder->channels != channels) {
gst_element_error (el,
"can't link %d-channel pad with %d-channel adder",
channels, adder->channels);
return FALSE;
}
if (adder->rate != rate) {
gst_element_error (el, "can't link %d Hz pad with %d Hz adder",
rate, adder->rate);
return FALSE;
} else {
/* whoa, we don't know what's trying to link with us ! barf ! */
return FALSE;
}
}
}
return TRUE;
}
static GstPadLinkReturn
gst_adder_link (GstPad *pad, GstCaps *caps)
{
GstAdder *adder;
const GList *sinkpads;
GList *remove = NULL;
GSList *channels;
GstPad *p;
g_return_val_if_fail (caps != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (pad != NULL, GST_PAD_LINK_REFUSED);
adder = GST_ADDER (GST_PAD_PARENT (pad));
if (GST_CAPS_IS_FIXED (caps)) {
if (!gst_adder_parse_caps (adder, caps))
return GST_PAD_LINK_REFUSED;
if (pad == adder->srcpad || gst_pad_try_set_caps (adder->srcpad, caps) > 0) {
sinkpads = gst_element_get_pad_list ((GstElement *) adder);
while (sinkpads) {
p = (GstPad *) sinkpads->data;
if (p != pad && p != adder->srcpad) {
if (gst_pad_try_set_caps (p, caps) <= 0) {
GST_DEBUG (GST_CAT_PLUGIN_INFO,
"caps mismatch; unlinking and removing pad %s:%s "
"(peer %s:%s)",
GST_DEBUG_PAD_NAME (p),
GST_DEBUG_PAD_NAME (GST_PAD_PEER (p)));
gst_pad_unlink (GST_PAD (GST_PAD_PEER (p)), p);
remove = g_list_prepend (remove, p);
}
}
sinkpads = g_list_next (sinkpads);
}
while (remove) {
gst_element_remove_pad (GST_ELEMENT (adder),
GST_PAD_CAST (remove->data));
restart:
channels = adder->input_channels;
while (channels) {
GstAdderInputChannel *channel;
channel = (GstAdderInputChannel*) channels->data;
if (channel->sinkpad == GST_PAD_CAST (remove->data)) {
gst_bytestream_destroy (channel->bytestream);
adder->input_channels = g_slist_remove_link (adder->input_channels,
channels);
adder->numsinkpads--;
goto restart;
}
channels = g_slist_next (channels);
}
remove = g_list_next (remove);
}
return GST_PAD_LINK_OK;
} else {
return GST_PAD_LINK_REFUSED;
}
} else {
return GST_PAD_LINK_DELAYED;
}
}
static void
gst_adder_class_init (GstAdderClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NUM_PADS,
g_param_spec_int ("num_pads","number of pads","Number Of Pads",
0, G_MAXINT, 0, G_PARAM_READABLE));
gobject_class->get_property = gst_adder_get_property;
gstelement_class->request_new_pad = gst_adder_request_new_pad;
gstelement_class->change_state = gst_adder_change_state;
}
static void
gst_adder_init (GstAdder *adder)
{
adder->srcpad = gst_pad_new_from_template (gst_adder_src_template_factory (),
"src");
gst_element_add_pad (GST_ELEMENT (adder), adder->srcpad);
gst_element_set_loop_function (GST_ELEMENT (adder), gst_adder_loop);
gst_pad_set_link_function (adder->srcpad, gst_adder_link);
adder->format = GST_ADDER_FORMAT_UNSET;
/* keep track of the sinkpads requested */
adder->bufpool = NULL;
adder->numsinkpads = 0;
adder->input_channels = NULL;
}
static GstPad*
gst_adder_request_new_pad (GstElement *element, GstPadTemplate *templ,
const gchar *unused)
{
gchar *name;
GstAdder *adder;
GstAdderInputChannel *input;
g_return_val_if_fail (GST_IS_ADDER (element), NULL);
if (templ->direction != GST_PAD_SINK) {
g_warning ("gstadder: request new pad that is not a SINK pad\n");
return NULL;
}
/* allocate space for the input_channel */
input = (GstAdderInputChannel *) g_malloc (sizeof (GstAdderInputChannel));
if (input == NULL) {
g_warning ("gstadder: could not allocate adder input channel !\n");
return NULL;
}
adder = GST_ADDER (element);
/* fill in input_channel structure */
name = g_strdup_printf ("sink%d", adder->numsinkpads);
input->sinkpad = gst_pad_new_from_template (templ, name);
input->bytestream = gst_bytestream_new (input->sinkpad);
gst_element_add_pad (GST_ELEMENT (adder), input->sinkpad);
gst_pad_set_link_function(input->sinkpad, gst_adder_link);
/* add the input_channel to the list of input channels */
adder->input_channels = g_slist_append (adder->input_channels, input);
adder->numsinkpads++;
return input->sinkpad;
}
static void
gst_adder_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstAdder *adder;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_ADDER (object));
adder = GST_ADDER (object);
switch (prop_id) {
case ARG_NUM_PADS:
g_value_set_int (value, adder->numsinkpads);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* use this loop */
static void
gst_adder_loop (GstElement *element)
{
/*
* combine channels by adding sample values
* basic algorithm :
* - request an output buffer from the pool
* - repeat for each input pipe :
* - get number of bytes from the channel's bytestream to fill output buffer
* - if there's an EOS event, remove the input channel
* - otherwise add the gotten bytes to the output buffer
* - push out the output buffer
*/
GstAdder *adder;
GstBuffer *buf_out;
GSList *inputs;
register guint i;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ADDER (element));
adder = GST_ADDER (element);
if (adder->bufpool == NULL) {
adder->bufpool = gst_pad_get_bufferpool (adder->srcpad);
if (adder->bufpool == NULL) {
adder->bufpool = gst_buffer_pool_get_default (GST_ADDER_BUFFER_SIZE,
GST_ADDER_NUM_BUFFERS);
}
}
/* get new output buffer */
buf_out = gst_buffer_new_from_pool (adder->bufpool, 0, 0);
if (buf_out == NULL) {
gst_element_error (GST_ELEMENT (adder),
"could not get new output buffer !\n");
return;
}
/* initialize the output data to 0 */
memset (GST_BUFFER_DATA (buf_out), 0, GST_BUFFER_SIZE (buf_out));
/* get data from all of the sinks */
inputs = adder->input_channels;
GST_DEBUG (GST_CAT_PLUGIN_INFO, "starting to cycle through channels");
while (inputs) {
guint32 got_bytes;
guint8 *raw_in;
GstAdderInputChannel *input;
input = (GstAdderInputChannel *) inputs->data;
inputs = inputs->next;
GST_DEBUG (GST_CAT_PLUGIN_INFO, "looking into channel %p", input);
if (!GST_PAD_IS_USABLE (input->sinkpad)) {
GST_DEBUG (GST_CAT_PLUGIN_INFO, "adder ignoring pad %s:%s",
GST_DEBUG_PAD_NAME (input->sinkpad));
continue;
}
/* Get data from the bytestream of each input channel.
* We need to check for events before passing on the data
* to the output buffer. */
got_bytes = gst_bytestream_peek_bytes (input->bytestream, &raw_in,
GST_BUFFER_SIZE (buf_out));
/* FIXME we should do something with the data if
* got_bytes is more than zero */
if (got_bytes < GST_BUFFER_SIZE(buf_out)) {
GstEvent *event = NULL;
guint32 waiting;
/* we need to check for an event. */
gst_bytestream_get_status (input->bytestream, &waiting, &event);
if (event) {
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
/* if we get an EOS event from one of our sink pads, we assume that
pad's finished handling data. just skip this pad */
GST_DEBUG (GST_CAT_PLUGIN_INFO, "got an EOS event");
gst_event_unref (event);
continue;
case GST_EVENT_INTERRUPT:
gst_event_unref (event);
GST_DEBUG (GST_CAT_PLUGIN_INFO, "got an interrupt event");
/* we have to call interrupt here, the scheduler will switch out this
* element ASAP or returns TRUE if we need to exit the loop */
if (gst_element_interrupt (GST_ELEMENT (adder))) {
gst_buffer_unref (buf_out);
return;
}
default:
break;
}
}
} else {
/* here's where the data gets copied. this is a little nasty looking
because it's the same code pretty much 3 times, except each time uses
different data types and clamp limits. */
GST_DEBUG (GST_CAT_PLUGIN_INFO,
"copying %d bytes from channel %p to output data %p "
"in buffer %p",
GST_BUFFER_SIZE (buf_out), input,
GST_BUFFER_DATA (buf_out), buf_out);
if (adder->format == GST_ADDER_FORMAT_INT) {
if (adder->width == 16) {
gint16 *in = (gint16 *) raw_in;
gint16 *out = (gint16 *) GST_BUFFER_DATA (buf_out);
for (i = 0; i < GST_BUFFER_SIZE (buf_out) / 2; i++)
out[i] = CLAMP(out[i] + in[i], -32768, 32767);
} else if (adder->width == 8) {
gint8 *in = (gint8 *) raw_in;
gint8 *out = (gint8 *) GST_BUFFER_DATA (buf_out);
for (i = 0; i < GST_BUFFER_SIZE (buf_out); i++)
out[i] = CLAMP(out[i] + in[i], -128, 127);
} else {
GST_ERROR (GST_ELEMENT (adder),
"invalid width (%d) for int format in gstadder\n",
adder->width);
}
} else if (adder->format == GST_ADDER_FORMAT_FLOAT) {
gfloat *in = (gfloat *) raw_in;
gfloat *out = (gfloat *) GST_BUFFER_DATA (buf_out);
for (i = 0; i < GST_BUFFER_SIZE (buf_out) / sizeof (gfloat); i++)
out[i] += in[i];
} else {
GST_ERROR (GST_ELEMENT (adder),
"invalid audio format (%d) in gstadder\n",
adder->format);
}
gst_bytestream_flush (input->bytestream, GST_BUFFER_SIZE (buf_out));
GST_DEBUG (GST_CAT_PLUGIN_INFO, "done copying data");
}
}
if (adder->format == GST_ADDER_FORMAT_UNSET) {
GstCaps *caps =
gst_caps_new ("default_adder_caps",
"audio/raw",
gst_props_new ("format", GST_PROPS_STRING ("int"),
"width", GST_PROPS_INT (16),
"depth", GST_PROPS_INT (16),
"rate", GST_PROPS_INT (44100),
"channels", GST_PROPS_INT (2),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"signed", GST_PROPS_BOOLEAN (TRUE),
NULL));
if (gst_pad_try_set_caps (adder->srcpad, caps) < 0) {
gst_element_error (GST_ELEMENT (adder),
"Couldn't set the default caps, "
"use link_filtered instead");
return;
}
gst_adder_parse_caps (adder, caps);
}
GST_BUFFER_TIMESTAMP (buf_out) = adder->timestamp;
if (adder->format == GST_ADDER_FORMAT_FLOAT)
adder->offset += GST_BUFFER_SIZE (buf_out) / sizeof (gfloat) / adder->channels;
else
adder->offset += GST_BUFFER_SIZE (buf_out) * 8 / adder->width / adder->channels;
adder->timestamp = adder->offset * GST_SECOND / adder->rate;
/* send it out */
GST_DEBUG (GST_CAT_PLUGIN_INFO, "pushing buf_out");
gst_pad_push (adder->srcpad, buf_out);
}
static GstElementStateReturn
gst_adder_change_state (GstElement *element)
{
GstAdder *adder;
adder = GST_ADDER (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
adder->timestamp = 0;
adder->offset = 0;
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
if (adder->bufpool) {
gst_buffer_pool_unref (adder->bufpool);
adder->bufpool = NULL;
}
break;
case GST_STATE_PAUSED_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
break;
default:
g_assert_not_reached ();
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_element_factory_new ("adder", GST_TYPE_ADDER, &adder_details);
g_return_val_if_fail (factory != NULL, FALSE);
if (! gst_library_load ("gstbytestream"))
return FALSE;
gst_element_factory_add_pad_template (factory,
GST_PAD_TEMPLATE_GET (gst_adder_src_template_factory));
gst_element_factory_add_pad_template (factory,
GST_PAD_TEMPLATE_GET (gst_adder_sink_template_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"adder",
plugin_init
};