gstreamer/plugins/elements/gstaudiosrc.c

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/* Gnome-Streamer
* Copyright (C) <1999> 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <gstaudiosrc.h>
GstElementDetails gst_audiosrc_details = {
"Audio (OSS) Source",
"Source/Audio",
"Read from the sound card",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* AudioSrc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_BYTESPERREAD,
ARG_CUROFFSET,
ARG_FORMAT,
ARG_CHANNELS,
ARG_FREQUENCY,
};
static void gst_audiosrc_class_init(GstAudioSrcClass *klass);
static void gst_audiosrc_init(GstAudioSrc *audiosrc);
static void gst_audiosrc_set_arg(GtkObject *object,GtkArg *arg,guint id);
static void gst_audiosrc_get_arg(GtkObject *object,GtkArg *arg,guint id);
static gboolean gst_audiosrc_change_state(GstElement *element,
GstElementState state);
static void gst_audiosrc_close_audio(GstAudioSrc *src);
static gboolean gst_audiosrc_open_audio(GstAudioSrc *src);
void gst_audiosrc_sync_parms(GstAudioSrc *audiosrc);
void gst_audiosrc_push(GstSrc *src);
static GstSrcClass *parent_class = NULL;
//static guint gst_audiosrc_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_audiosrc_get_type(void) {
static GtkType audiosrc_type = 0;
if (!audiosrc_type) {
static const GtkTypeInfo audiosrc_info = {
"GstAudioSrc",
sizeof(GstAudioSrc),
sizeof(GstAudioSrcClass),
(GtkClassInitFunc)gst_audiosrc_class_init,
(GtkObjectInitFunc)gst_audiosrc_init,
(GtkArgSetFunc)gst_audiosrc_set_arg,
(GtkArgGetFunc)gst_audiosrc_get_arg,
(GtkClassInitFunc)NULL,
};
audiosrc_type = gtk_type_unique(GST_TYPE_SRC,&audiosrc_info);
}
return audiosrc_type;
}
static void
gst_audiosrc_class_init(GstAudioSrcClass *klass) {
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
GstSrcClass *gstsrc_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
gstsrc_class = (GstSrcClass*)klass;
parent_class = gtk_type_class(GST_TYPE_SRC);
gtk_object_add_arg_type("GstAudioSrc::bytes_per_read", GTK_TYPE_ULONG,
GTK_ARG_READWRITE, ARG_BYTESPERREAD);
gtk_object_add_arg_type("GstAudioSrc::curoffset", GTK_TYPE_ULONG,
GTK_ARG_READABLE, ARG_CUROFFSET);
gtk_object_add_arg_type("GstAudioSrc::format", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_FORMAT);
gtk_object_add_arg_type("GstAudioSrc::channels", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_CHANNELS);
gtk_object_add_arg_type("GstAudioSrc::frequency", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_FREQUENCY);
gtkobject_class->set_arg = gst_audiosrc_set_arg;
gtkobject_class->get_arg = gst_audiosrc_get_arg;
gstelement_class->change_state = gst_audiosrc_change_state;
gstsrc_class->push = gst_audiosrc_push;
}
static void gst_audiosrc_init(GstAudioSrc *audiosrc) {
audiosrc->srcpad = gst_pad_new("src",GST_PAD_SRC);
gst_element_add_pad(GST_ELEMENT(audiosrc),audiosrc->srcpad);
audiosrc->fd = -1;
// audiosrc->meta = (MetaAudioRaw *)gst_meta_new();
// audiosrc->meta->format = AFMT_S16_LE;
// audiosrc->meta->channels = 2;
// audiosrc->meta->frequency = 44100;
// audiosrc->meta->bps = 4;
audiosrc->bytes_per_read = 4096;
audiosrc->curoffset = 0;
audiosrc->seq = 0;
}
GstElement *gst_audiosrc_new(gchar *name) {
GstElement *audiosrc = GST_ELEMENT(gtk_type_new(GST_TYPE_AUDIOSRC));
gst_element_set_name(GST_ELEMENT(audiosrc),name);
return audiosrc;
}
void gst_audiosrc_push(GstSrc *src) {
GstAudioSrc *audiosrc;
GstBuffer *buf;
glong readbytes;
g_return_if_fail(src != NULL);
g_return_if_fail(GST_IS_AUDIOSRC(src));
audiosrc = GST_AUDIOSRC(src);
// g_print("attempting to read something from soundcard\n");
buf = gst_buffer_new();
g_return_if_fail(buf);
GST_BUFFER_DATA(buf) = (gpointer)g_malloc(audiosrc->bytes_per_read);
readbytes = read(audiosrc->fd,GST_BUFFER_DATA(buf),
audiosrc->bytes_per_read);
if (readbytes == 0) {
gst_src_signal_eos(GST_SRC(audiosrc));
return;
}
GST_BUFFER_SIZE(buf) = readbytes;
GST_BUFFER_OFFSET(buf) = audiosrc->curoffset;
audiosrc->curoffset += readbytes;
// gst_buffer_add_meta(buf,GST_META(newmeta));
gst_pad_push(audiosrc->srcpad,buf);
// g_print("pushed buffer from soundcard of %d bytes\n",readbytes);
}
static void gst_audiosrc_set_arg(GtkObject *object,GtkArg *arg,guint id) {
GstAudioSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_AUDIOSRC(object));
src = GST_AUDIOSRC(object);
switch (id) {
case ARG_BYTESPERREAD:
src->bytes_per_read = GTK_VALUE_INT(*arg);
break;
case ARG_FORMAT:
src->format = GTK_VALUE_INT(*arg);
break;
case ARG_CHANNELS:
src->channels = GTK_VALUE_INT(*arg);
break;
case ARG_FREQUENCY:
src->frequency = GTK_VALUE_INT(*arg);
break;
default:
break;
}
}
static void gst_audiosrc_get_arg(GtkObject *object,GtkArg *arg,guint id) {
GstAudioSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_AUDIOSRC(object));
src = GST_AUDIOSRC(object);
switch (id) {
case ARG_BYTESPERREAD:
GTK_VALUE_INT(*arg) = src->bytes_per_read;
break;
case ARG_FORMAT:
GTK_VALUE_INT(*arg) = src->format;
break;
case ARG_CHANNELS:
GTK_VALUE_INT(*arg) = src->channels;
break;
case ARG_FREQUENCY:
GTK_VALUE_INT(*arg) = src->frequency;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static gboolean gst_audiosrc_change_state(GstElement *element,
GstElementState state) {
g_return_val_if_fail(GST_IS_AUDIOSRC(element), FALSE);
switch (state) {
case GST_STATE_RUNNING:
if (!gst_audiosrc_open_audio(GST_AUDIOSRC(element)))
return FALSE;
break;
case ~GST_STATE_RUNNING:
gst_audiosrc_close_audio(GST_AUDIOSRC(element));
break;
default:
break;
}
if (GST_ELEMENT_CLASS(parent_class)->change_state)
return GST_ELEMENT_CLASS(parent_class)->change_state(element,state);
return TRUE;
}
static gboolean gst_audiosrc_open_audio(GstAudioSrc *src) {
g_return_val_if_fail(src->fd == -1, FALSE);
/* first try to open the sound card */
src->fd = open("/dev/dsp",O_RDONLY);
/* if we have it, set the default parameters and go have fun */
if (src->fd > 0) {
int arg = 0x7fff0006;
if (ioctl(src->fd, SNDCTL_DSP_SETFRAGMENT, &arg)) perror("uh");
/* set card state */
gst_audiosrc_sync_parms(src);
DEBUG("opened audio\n");
return TRUE;
}
return FALSE;
}
static void gst_audiosrc_close_audio(GstAudioSrc *src) {
g_return_if_fail(src->fd >= 0);
close(src->fd);
src->fd = -1;
}
void gst_audiosrc_sync_parms(GstAudioSrc *audiosrc) {
audio_buf_info ospace;
g_return_if_fail(audiosrc != NULL);
g_return_if_fail(GST_IS_AUDIOSRC(audiosrc));
g_return_if_fail(audiosrc->fd > 0);
ioctl(audiosrc->fd,SNDCTL_DSP_RESET,0);
ioctl(audiosrc->fd,SNDCTL_DSP_SETFMT,&audiosrc->format);
ioctl(audiosrc->fd,SNDCTL_DSP_CHANNELS,&audiosrc->channels);
ioctl(audiosrc->fd,SNDCTL_DSP_SPEED,&audiosrc->frequency);
ioctl(audiosrc->fd,SNDCTL_DSP_GETOSPACE,&ospace);
g_print("setting sound card to %dKHz %d bit %s (%d bytes buffer)\n",
audiosrc->frequency,audiosrc->format,
(audiosrc->channels == 2) ? "stereo" : "mono",ospace.bytes);
// audiosrc->meta.format = audiosrc->format;
// audiosrc->meta.channels = audiosrc->channels;
// audiosrc->meta.frequency = audiosrc->frequency;
// audiosrc->sentmeta = FALSE;
}