/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2001 Thomas * * 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 #include /* 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 ", "(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 };