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 GstElementStateReturn gst_audiosrc_change_state (GstElement *element);
static void gst_audiosrc_close_audio (GstAudioSrc *src);
static gboolean gst_audiosrc_open_audio (GstAudioSrc *src);
static void gst_audiosrc_sync_parms (GstAudioSrc *audiosrc);
static 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;
}
static 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 GstElementStateReturn
gst_audiosrc_change_state (GstElement *element)
{
g_return_val_if_fail (GST_IS_AUDIOSRC (element), FALSE);
/* if going down into NULL state, close the file if it's open */
if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
if (GST_FLAG_IS_SET (element, GST_AUDIOSRC_OPEN))
gst_audiosrc_close_audio (GST_AUDIOSRC (element));
/* otherwise (READY or higher) we need to open the sound card */
} else {
if (!GST_FLAG_IS_SET (element, GST_AUDIOSRC_OPEN)) {
if (!gst_audiosrc_open_audio (GST_AUDIOSRC (element)))
return GST_STATE_FAILURE;
}
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
gst_audiosrc_open_audio (GstAudioSrc *src)
{
g_return_val_if_fail (!GST_FLAG_IS_SET (src, GST_AUDIOSRC_OPEN), 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");
GST_FLAG_SET (src, GST_AUDIOSRC_OPEN);
return TRUE;
}
return FALSE;
}
static void
gst_audiosrc_close_audio (GstAudioSrc *src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, GST_AUDIOSRC_OPEN));
close(src->fd);
src->fd = -1;
GST_FLAG_UNSET (src, GST_AUDIOSRC_OPEN);
}
static 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;
}