diff options
Diffstat (limited to 'gst/playondemand/gstplayondemand.c')
| -rw-r--r-- | gst/playondemand/gstplayondemand.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/gst/playondemand/gstplayondemand.c b/gst/playondemand/gstplayondemand.c new file mode 100644 index 00000000..9d2ebff3 --- /dev/null +++ b/gst/playondemand/gstplayondemand.c @@ -0,0 +1,448 @@ +/* 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. + */ + +#include <string.h> +#include <gst/gst.h> +#include <libs/audio/gstaudio.h> +#include "gstplayondemand.h" + + +#define POD_MAX_PLAYS 192 /* maximum number of simultaneous plays */ +#define POD_GSTBUFSIZE 4096 /* gstreamer buffer size to make if no + bufferpool is available, must be divisible + by sizeof(gfloat) */ +#define POD_BUFSPERCHUNK 6 /* number of buffers to allocate per chunk in + sink buffer pool */ +#define POD_BUFFER_SIZE 882000 /* enough space for 10 seconds of 16-bit audio + at 44100 samples per second ... */ + +static GstElementDetails play_on_demand_details = { + "Play On Demand", + "Filter/Effect", + "Plays a stream whenever it receives a certain signal", + VERSION, + "Leif Morgan Johnson <lmjohns3@eos.ncsu.edu>", + "(C) 2001", +}; + + +/* Filter signals and args */ +enum { + /* FILL ME */ + PLAY_SIGNAL, + RESET_SIGNAL, + LAST_SIGNAL +}; + +enum { + ARG_0, + ARG_SILENT, + ARG_FOLLOWTAIL, + ARG_BUFFERSIZE +}; + +static GstPadTemplate* +play_on_demand_sink_factory (void) +{ + static GstPadTemplate *template = NULL; + + if (!template) { + template = gst_padtemplate_new + ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, + gst_caps_append(gst_caps_new ("sink_int", "audio/raw", + GST_AUDIO_INT_PAD_TEMPLATE_PROPS), + gst_caps_new ("sink_float", "audio/raw", + GST_AUDIO_FLOAT_MONO_PAD_TEMPLATE_PROPS)), + NULL); + } + return template; +} + +static GstPadTemplate* +play_on_demand_src_factory (void) +{ + static GstPadTemplate *template = NULL; + + if (!template) + template = gst_padtemplate_new + ("src", GST_PAD_SRC, GST_PAD_ALWAYS, + gst_caps_append (gst_caps_new ("src_float", "audio/raw", + GST_AUDIO_FLOAT_MONO_PAD_TEMPLATE_PROPS), + gst_caps_new ("src_int", "audio/raw", + GST_AUDIO_INT_PAD_TEMPLATE_PROPS)), + NULL); + + return template; +} + +static void play_on_demand_class_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 gint play_on_demand_parse_caps (GstPlayOnDemand *filter, GstCaps *caps); + +static void play_on_demand_loop (GstElement *elem); + +static void play_on_demand_play_handler (GstElement *elem); +static void play_on_demand_reset_handler (GstElement *elem); + +static GstElementClass *parent_class = NULL; +static guint gst_pod_filter_signals[LAST_SIGNAL] = { 0 }; + +static GstBufferPool* +play_on_demand_get_bufferpool (GstPad *pad) +{ + GstPlayOnDemand *filter; + + filter = GST_PLAYONDEMAND(gst_pad_get_parent(pad)); + + return gst_pad_get_bufferpool(filter->srcpad); +} + +static GstPadNegotiateReturn +play_on_demand_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data) +{ + GstPlayOnDemand* filter = GST_PLAYONDEMAND(gst_pad_get_parent(pad)); + + if (*caps == NULL) + return GST_PAD_NEGOTIATE_FAIL; + + if (play_on_demand_parse_caps(filter, *caps)) + return GST_PAD_NEGOTIATE_FAIL; + + return gst_pad_negotiate_proxy(pad, filter->sinkpad, caps); +} + +static GstPadNegotiateReturn +play_on_demand_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data) +{ + GstPlayOnDemand* filter = GST_PLAYONDEMAND(gst_pad_get_parent(pad)); + + if (*caps == NULL) + return GST_PAD_NEGOTIATE_FAIL; + + if (play_on_demand_parse_caps(filter, *caps)) + return GST_PAD_NEGOTIATE_FAIL; + + return gst_pad_negotiate_proxy(pad, filter->srcpad, caps); +} + +static gint +play_on_demand_parse_caps (GstPlayOnDemand *filter, GstCaps *caps) +{ + const gchar *format; + + g_return_val_if_fail(filter != NULL, -1); + g_return_val_if_fail(caps != NULL, -1); + + format = gst_caps_get_string(caps, "format"); + + filter->rate = gst_caps_get_int(caps, "rate"); + filter->channels = gst_caps_get_int(caps, "channels"); + + if (strcmp(format, "int") == 0) { + filter->format = GST_PLAYONDEMAND_FORMAT_INT; + filter->width = gst_caps_get_int(caps, "width"); + filter->depth = gst_caps_get_int(caps, "depth"); + filter->law = gst_caps_get_int(caps, "law"); + filter->endianness = gst_caps_get_int(caps, "endianness"); + filter->is_signed = gst_caps_get_int(caps, "signed"); + if (!filter->silent) { + g_print ("PlayOnDemand : channels %d, rate %d\n", + filter->channels, filter->rate); + g_print ("PlayOnDemand : format int, bit width %d, endianness %d, signed %s\n", + filter->width, filter->endianness, filter->is_signed ? "yes" : "no"); + } + } else if (strcmp(format, "float")==0) { + filter->format = GST_PLAYONDEMAND_FORMAT_FLOAT; + filter->layout = gst_caps_get_string(caps, "layout"); + filter->intercept = gst_caps_get_float(caps, "intercept"); + filter->slope = gst_caps_get_float(caps, "slope"); + if (!filter->silent) { + g_print ("PlayOnDemand : channels %d, rate %d\n", + filter->channels, filter->rate); + g_print ("PlayOnDemand : format float, layout %s, intercept %f, slope %f\n", + filter->layout, filter->intercept, filter->slope); + } + } else { + return -1; + } + return 0; +} + + +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), + NULL, + 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; +} + +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[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[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->reset = play_on_demand_reset_handler; + + parent_class = g_type_class_ref(GST_TYPE_ELEMENT); + + g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SILENT, + g_param_spec_boolean("silent","silent","silent", + TRUE, G_PARAM_READWRITE)); // CHECKME + + g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FOLLOWTAIL, + g_param_spec_boolean("follow-stream-tail","follow-stream-tail","follow-stream-tail", + FALSE, G_PARAM_READWRITE)); + + g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BUFFERSIZE, + g_param_spec_uint("buffer-size","buffer-size","buffer-size", + 0, G_MAXUINT - 1, POD_BUFFER_SIZE, G_PARAM_READWRITE)); + + gobject_class->set_property = play_on_demand_set_property; + gobject_class->get_property = play_on_demand_get_property; +} + +static void +play_on_demand_init (GstPlayOnDemand *filter) +{ + guint i; + + filter->sinkpad = gst_pad_new_from_template(play_on_demand_sink_factory(), "sink"); + gst_pad_set_negotiate_function(filter->sinkpad, play_on_demand_negotiate_sink); + gst_pad_set_bufferpool_function(filter->sinkpad, play_on_demand_get_bufferpool); + + filter->srcpad = gst_pad_new_from_template(play_on_demand_src_factory(), "src"); + gst_pad_set_negotiate_function(filter->srcpad, play_on_demand_negotiate_src); + + 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->sinkpool = gst_buffer_pool_get_default(POD_GSTBUFSIZE, POD_BUFSPERCHUNK); + + filter->follow_stream_tail = FALSE; + filter->silent = TRUE; + + filter->buffer = g_new(gchar, POD_BUFFER_SIZE); + filter->buffer_size = POD_BUFFER_SIZE; + filter->start = 0; + filter->write = 0; + + filter->eos = FALSE; + + /* the plays are stored as an array of buffer offsets. this initializes the + array to `blank' values (G_MAXUINT is an invalid index for this filter). */ + filter->plays = g_new(guint, POD_MAX_PLAYS); + for (i = 0; i < POD_MAX_PLAYS; i++) { + filter->plays[i] = G_MAXUINT; + } +} + +static void +play_on_demand_loop (GstElement *elem) +{ + GstPlayOnDemand *filter = GST_PLAYONDEMAND(elem); + guint num_in, num_out, num_filter; + GstBuffer *in, *out; + register guint j, k, t; + guint w, offset; + + g_return_if_fail(filter != NULL); + g_return_if_fail(GST_IS_PLAYONDEMAND(filter)); + + filter->srcpool = gst_pad_get_bufferpool(filter->srcpad); + + in = gst_pad_pull(filter->sinkpad); + + if (filter->format == GST_PLAYONDEMAND_FORMAT_INT) { + if (filter->width == 16) { + gint16 min = -32768; + gint16 max = 32767; + gint16 zero = 0; +#define _TYPE_ gint16 +#include "filter.func" +#undef _TYPE_ + } else if (filter->width == 8) { + gint8 min = -128; + gint8 max = 127; + 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_play_handler(GstElement *elem) +{ + GstPlayOnDemand *filter = GST_PLAYONDEMAND(elem); + register guint i; + + for (i = 0; i < POD_MAX_PLAYS; i++) { + if (filter->plays[i] == G_MAXUINT) { + filter->plays[i] = filter->start; + break; + } + } +} + +static void +play_on_demand_reset_handler(GstElement *elem) +{ + GstPlayOnDemand *filter = GST_PLAYONDEMAND(elem); + register guint i; + + for (i = 0; i < POD_MAX_PLAYS; i++) { + filter->plays[i] = G_MAXUINT; + } + + filter->start = 0; + filter->write = 0; +} + +static void +play_on_demand_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) +{ + GstPlayOnDemand *filter; + + /* it's not null if we got it, but it might not be ours */ + g_return_if_fail(GST_IS_PLAYONDEMAND(object)); + filter = GST_PLAYONDEMAND(object); + + switch (prop_id) { + case ARG_BUFFERSIZE: + filter->buffer_size = g_value_get_uint(value); + + /* reallocate space for the buffer with the new size values. */ + g_free(filter->buffer); + filter->buffer = g_new(gchar, filter->buffer_size); + + /* reset the play pointers and read/write indexes. */ + play_on_demand_reset_handler(GST_ELEMENT(filter)); + break; + case ARG_SILENT: + filter->silent = g_value_get_boolean(value); + break; + case ARG_FOLLOWTAIL: + filter->follow_stream_tail = g_value_get_boolean(value); + play_on_demand_reset_handler(GST_ELEMENT(filter)); + break; + default: + break; + } +} + +static void +play_on_demand_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) +{ + GstPlayOnDemand *filter; + + /* it's not null if we got it, but it might not be ours */ + g_return_if_fail(GST_IS_PLAYONDEMAND(object)); + filter = GST_PLAYONDEMAND(object); + + switch (prop_id) { + case ARG_BUFFERSIZE: + g_value_set_uint(value, filter->buffer_size); + break; + case ARG_SILENT: + g_value_set_boolean(value, filter->silent); + break; + case ARG_FOLLOWTAIL: + g_value_set_boolean(value, filter->follow_stream_tail); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec); + break; + } +} + +static gboolean +plugin_init (GModule *module, GstPlugin *plugin) +{ + GstElementFactory *factory; + + factory = gst_elementfactory_new("playondemand", + GST_TYPE_PLAYONDEMAND, + &play_on_demand_details); + g_return_val_if_fail(factory != NULL, FALSE); + + gst_elementfactory_add_padtemplate(factory, play_on_demand_src_factory()); + gst_elementfactory_add_padtemplate(factory, play_on_demand_sink_factory()); + + gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE(factory)); + + return TRUE; +} + +GstPluginDesc plugin_desc = { + GST_VERSION_MAJOR, + GST_VERSION_MINOR, + "playondemand", + plugin_init +}; |