diff options
Diffstat (limited to 'sys/oss/gstossgst.c')
| -rw-r--r-- | sys/oss/gstossgst.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/sys/oss/gstossgst.c b/sys/oss/gstossgst.c new file mode 100644 index 00000000..332f8214 --- /dev/null +++ b/sys/oss/gstossgst.c @@ -0,0 +1,448 @@ +/* GStreamer + * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> + * 2000 Wim Taymans <wim.taymans@chello.be> + * + * gstossgst.c: + * + * 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 <sys/ioctl.h> +#include <fcntl.h> +#include <sys/soundcard.h> +#include <unistd.h> +#include <errno.h> +#include <stdlib.h> + +#include "gstossgst.h" + +#include "gstosshelper.h" + +static GstElementDetails gst_ossgst_details = { + "Audio Wrapper (OSS)", + "Src/Audio", + "Hijacks /dev/dsp to get the output of OSS apps into GStreamer", + VERSION, + "Wim Taymans <wim.taymans@chello.be>", + "(C) 2001", +}; + +static void gst_ossgst_class_init (GstOssGstClass *klass); +static void gst_ossgst_init (GstOssGst *ossgst); + +static GstElementStateReturn gst_ossgst_change_state (GstElement *element); + +static void gst_ossgst_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); +static void gst_ossgst_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); + +static GstBuffer* gst_ossgst_get (GstPad *pad); + +/* OssGst signals and args */ +enum { + LAST_SIGNAL +}; + +enum { + ARG_0, + ARG_MUTE, + ARG_PROGRAM, + /* FILL ME */ +}; + +static GstPadTemplate* +ossgst_src_factory (void) +{ + return + gst_padtemplate_new ( + "src", + GST_PAD_SRC, + GST_PAD_ALWAYS, + gst_caps_new ( + "ossgst_src", + "audio/raw", + gst_props_new ( + "format", GST_PROPS_STRING ("int"), + "law", GST_PROPS_INT (0), + "endianness", GST_PROPS_INT (G_BYTE_ORDER), + "signed", GST_PROPS_LIST ( + GST_PROPS_BOOLEAN (FALSE), + GST_PROPS_BOOLEAN (TRUE) + ), + "width", GST_PROPS_LIST ( + GST_PROPS_INT (8), + GST_PROPS_INT (16) + ), + "depth", GST_PROPS_LIST ( + GST_PROPS_INT (8), + GST_PROPS_INT (16) + ), + "rate", GST_PROPS_INT_RANGE (8000, 48000), + "channels", GST_PROPS_INT_RANGE (1, 2), + NULL)), + NULL); +} + + +static GstElementClass *parent_class = NULL; +static GstPadTemplate *gst_ossgst_src_template; + +static gchar *plugin_dir = NULL; + +GType +gst_ossgst_get_type (void) +{ + static GType ossgst_type = 0; + + if (!ossgst_type) { + static const GTypeInfo ossgst_info = { + sizeof(GstOssGstClass), + NULL, + NULL, + (GClassInitFunc)gst_ossgst_class_init, + NULL, + NULL, + sizeof(GstOssGst), + 0, + (GInstanceInitFunc)gst_ossgst_init, + }; + ossgst_type = g_type_register_static (GST_TYPE_ELEMENT, "GstOssGst", &ossgst_info, 0); + } + + return ossgst_type; +} + +static void +gst_ossgst_class_init (GstOssGstClass *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_MUTE, + g_param_spec_boolean("mute","mute","mute", + TRUE,G_PARAM_READWRITE)); // CHECKME + g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_PROGRAM, + g_param_spec_string("command","command","command", + NULL, G_PARAM_READWRITE)); // CHECKME + + gobject_class->set_property = gst_ossgst_set_property; + gobject_class->get_property = gst_ossgst_get_property; + + gstelement_class->change_state = gst_ossgst_change_state; +} + +static void +gst_ossgst_init (GstOssGst *ossgst) +{ + ossgst->srcpad = gst_pad_new_from_template (gst_ossgst_src_template, "src"); + gst_element_add_pad (GST_ELEMENT (ossgst), ossgst->srcpad); + + gst_pad_set_get_function (ossgst->srcpad, gst_ossgst_get); + + ossgst->command = NULL; +} + +static GstCaps* +gst_ossgst_format_to_caps (gint format, gint stereo, gint rate) +{ + GstCaps *caps = NULL; + gint law = 0; + gulong endianness = G_BYTE_ORDER; + gboolean is_signed = TRUE; + gint width = 16; + gboolean supported = TRUE; + + GST_DEBUG (0, "have format 0x%08x %d %d\n", format, stereo, rate); + + switch (format) { + case AFMT_MU_LAW: + law = 1; + break; + case AFMT_A_LAW: + law = 2; + break; + case AFMT_U8: + width = 8; + is_signed = FALSE; + break; + case AFMT_S16_LE: + width = 16; + endianness = G_LITTLE_ENDIAN; + is_signed = TRUE; + break; + case AFMT_S16_BE: + endianness = G_BIG_ENDIAN; + width = 16; + is_signed = TRUE; + break; + case AFMT_S8: + width = 8; + is_signed = TRUE; + break; + case AFMT_U16_LE: + width = 16; + endianness = G_LITTLE_ENDIAN; + is_signed = FALSE; + break; + case AFMT_U16_BE: + width = 16; + endianness = G_BIG_ENDIAN; + is_signed = FALSE; + break; + case AFMT_IMA_ADPCM: + case AFMT_MPEG: +#ifdef AFMT_AC3 + case AFMT_AC3: +#endif + default: + supported = FALSE; + break; + } + + if (supported) { + caps = gst_caps_new ( + "ossgst_caps", + "audio/raw", + gst_props_new ( + "format", GST_PROPS_STRING ("int"), + "law", GST_PROPS_INT (law), + "endianness", GST_PROPS_INT (endianness), + "signed", GST_PROPS_BOOLEAN (is_signed), + "width", GST_PROPS_INT (width), + "depth", GST_PROPS_INT (width), + "rate", GST_PROPS_INT (rate), + "channels", GST_PROPS_INT (stereo?2:1), + NULL)); + } + else { + g_warning ("gstossgst: program tried to use unsupported format %x\n", format); + } + + return caps; +} + +static GstBuffer* +gst_ossgst_get (GstPad *pad) +{ + GstOssGst *ossgst; + GstBuffer *buf = NULL; + command cmd; + gboolean have_data = FALSE; + + g_return_val_if_fail (pad != NULL, NULL); + g_return_val_if_fail (GST_IS_PAD (pad), NULL); + + /* this has to be an audio buffer */ + ossgst = GST_OSSGST (gst_pad_get_parent (pad)); + + while (!have_data) { + /* read the command */ + read (ossgst->fdout[0], &cmd, sizeof (command)); + + switch (cmd.id) { + case CMD_DATA: + buf = gst_buffer_new (); + GST_BUFFER_SIZE (buf) = cmd.cmd.length; + GST_BUFFER_DATA (buf) = g_malloc (GST_BUFFER_SIZE (buf)); + + GST_BUFFER_SIZE (buf) = read (ossgst->fdout[0], GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf)); + have_data = TRUE; + break; + case CMD_FORMAT: + { + GstCaps *caps; + + caps = gst_ossgst_format_to_caps (cmd.cmd.format.format, + cmd.cmd.format.stereo, + cmd.cmd.format.rate); + + gst_pad_set_caps (ossgst->srcpad, caps); + } + break; + default: + break; + } + } + + return buf; +} + +static void +gst_ossgst_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) +{ + GstOssGst *ossgst; + + /* it's not null if we got it, but it might not be ours */ + g_return_if_fail (GST_IS_OSSGST (object)); + + ossgst = GST_OSSGST (object); + + switch (prop_id) { + case ARG_MUTE: + ossgst->mute = g_value_get_boolean (value); + break; + case ARG_PROGRAM: + if (ossgst->command) + g_free (ossgst->command); + ossgst->command = g_strdup (g_value_get_string (value)); + break; + default: + break; + } +} + +static void +gst_ossgst_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) +{ + GstOssGst *ossgst; + + /* it's not null if we got it, but it might not be ours */ + g_return_if_fail (GST_IS_OSSGST (object)); + + ossgst = GST_OSSGST (object); + + switch (prop_id) { + case ARG_MUTE: + g_value_set_boolean (value, ossgst->mute); + break; + case ARG_PROGRAM: + g_value_set_string (value, ossgst->command); + break; + default: + break; + } +} + +static gboolean +gst_ossgst_spawn_process (GstOssGst *ossgst) +{ + static gchar *ld_preload; + + pipe(ossgst->fdin); + pipe(ossgst->fdout); + + GST_DEBUG (0, "about to fork\n"); + + if((ossgst->childpid = fork()) == -1) + { + perror("fork"); + gst_element_error(GST_ELEMENT(ossgst),"forking"); + return FALSE; + } + GST_DEBUG (0,"forked %d\n", ossgst->childpid); + + if(ossgst->childpid == 0) + { + gchar **args; + + GST_DEBUG (0, "fork command %d\n", ossgst->childpid); + + ld_preload = getenv ("LD_PRELOAD"); + + if (ld_preload == NULL) { + ld_preload = ""; + } + + ld_preload = g_strconcat (ld_preload, " ", plugin_dir, G_DIR_SEPARATOR_S, + "libgstosshelper.so", NULL); + + setenv ("LD_PRELOAD", ld_preload, TRUE); + + // child + dup2(ossgst->fdin[0], HELPER_MAGIC_IN); /* set the childs input stream */ + dup2(ossgst->fdout[1], HELPER_MAGIC_OUT); /* set the childs output stream */ + + // split the arguments + args = g_strsplit (ossgst->command, " ", 0); + + execvp(args[0], args); + + // will only reach if error + perror("exec"); + gst_element_error(GST_ELEMENT(ossgst),"starting child process"); + return FALSE; + + } + GST_FLAG_SET(ossgst,GST_OSSGST_OPEN); + + return TRUE; +} + +static gboolean +gst_ossgst_kill_process (GstOssGst *ossgst) +{ + return TRUE; +} + +static GstElementStateReturn +gst_ossgst_change_state (GstElement *element) +{ + g_return_val_if_fail (GST_IS_OSSGST (element), FALSE); + + if (GST_STATE_PENDING (element) == GST_STATE_NULL) { + if (GST_FLAG_IS_SET (element, GST_OSSGST_OPEN)) + gst_ossgst_kill_process (GST_OSSGST (element)); + } else { + if (!GST_FLAG_IS_SET (element, GST_OSSGST_OPEN)) { + if (!gst_ossgst_spawn_process (GST_OSSGST (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; +} + +gboolean +gst_ossgst_factory_init (GstPlugin *plugin) +{ + GstElementFactory *factory; + gchar **path; + gint i =0; + + // get the path of this plugin, we assume the helper progam lives in the + // same directory. + path = g_strsplit (plugin->filename, G_DIR_SEPARATOR_S, 0); + while (path[i]) { + i++; + if (path[i] == NULL) { + g_free (path[i-1]); + path[i-1] = NULL; + } + } + plugin_dir = g_strjoinv (G_DIR_SEPARATOR_S, path); + g_strfreev (path); + + factory = gst_elementfactory_new ("ossgst", GST_TYPE_OSSGST, &gst_ossgst_details); + g_return_val_if_fail (factory != NULL, FALSE); + + gst_ossgst_src_template = ossgst_src_factory (); + gst_elementfactory_add_padtemplate (factory, gst_ossgst_src_template); + + gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory)); + + return TRUE; +} + |