mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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23d2a4198b
Original commit message from CVS: Changed to the new props API Other small tuff.
1442 lines
47 KiB
C
1442 lines
47 KiB
C
/*
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Copyright (C) 2001 CodeFactory AB
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Copyright (C) 2001 Thomas Nyberg <thomas@codefactory.se>
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Copyright (C) 2001 Andy Wingo <apwingo@eos.ncsu.edu>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include "gstalsa.h"
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static GstElementDetails gst_alsa_sink_details = {
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"Alsa Sink",
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"Sink/Audio",
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"Output to a sound card via ALSA: see plugins/alsa/README for more info",
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VERSION,
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"Thomas Nyberg <thomas@codefactory.se>, "
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"Andy Wingo <apwingo@eos.ncsu.edu>",
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"(C) 2001 "
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};
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static GstElementDetails gst_alsa_src_details = {
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"Alsa Src",
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"Source/Audio",
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"Read from a sound card via ALSA: see plugins/alsa/README for more info",
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VERSION,
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"Thomas Nyberg <thomas@codefactory.se>, "
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"Andy Wingo <apwingo@eos.ncsu.edu>"
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"(C) 2001",
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};
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static GstElement *parent_class = NULL;
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static void gst_alsa_init(GstAlsa *this);
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static void gst_alsa_class_init(GstAlsaClass *klass);
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static GstPadTemplate *gst_alsa_src_pad_factory();
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static GstPadTemplate *gst_alsa_src_request_pad_factory();
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static GstPadTemplate *gst_alsa_sink_pad_factory();
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static GstPadTemplate *gst_alsa_sink_request_pad_factory();
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static GstPad* gst_alsa_request_new_pad (GstElement *element, GstPadTemplate *templ, const
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gchar *name);
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static void gst_alsa_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_alsa_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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static GstElementStateReturn gst_alsa_change_state(GstElement *element);
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/*static GstPadNegotiateReturn gst_alsa_negotiate(GstPad *pad, GstCaps **caps, gpointer *user_data); */
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static GstCaps* gst_alsa_caps (GstAlsa *this);
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static gboolean gst_alsa_open_audio(GstAlsa *this);
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static gboolean gst_alsa_start_audio(GstAlsa *this);
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static void gst_alsa_stop_audio(GstAlsa *this);
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static void gst_alsa_close_audio(GstAlsa *this);
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static gboolean gst_alsa_set_params(GstAlsa *this);
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static void gst_alsa_loop (GstElement *element);
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static gboolean gst_alsa_sink_process (GstAlsa *this, snd_pcm_uframes_t frames);
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static gboolean gst_alsa_src_process (GstAlsa *this, snd_pcm_uframes_t frames);
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static gboolean gst_alsa_get_channel_addresses (GstAlsa *this);
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static void gst_alsa_release_channel_addresses (GstAlsa *this);
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static void gst_alsa_sink_silence_on_channel (GstAlsa *this, guint32 chn, guint32 nframes);
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static void memset_interleave (char *dst, char val, unsigned int bytes,
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unsigned int unit_bytes,
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unsigned int skip_bytes);
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enum {
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ARG_0,
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ARG_DEVICE,
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ARG_FORMAT,
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ARG_CHANNELS,
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ARG_RATE,
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ARG_PERIODCOUNT,
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ARG_PERIODFRAMES
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};
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GType
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gst_alsa_get_type (void)
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{
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static GType alsa_type = 0;
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if (!alsa_type) {
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static const GTypeInfo alsa_info = {
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sizeof(GstAlsaClass),
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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sizeof(GstAlsa),
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0,
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NULL,
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};
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alsa_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAlsa", &alsa_info, 0);
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}
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return alsa_type;
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}
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GType
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gst_alsa_sink_get_type (void)
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{
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static GType alsa_type = 0;
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if (!alsa_type) {
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static const GTypeInfo alsa_info = {
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sizeof(GstAlsaClass),
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NULL,
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NULL,
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(GClassInitFunc)gst_alsa_class_init,
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NULL,
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NULL,
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sizeof(GstAlsa),
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0,
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(GInstanceInitFunc)gst_alsa_init,
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};
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alsa_type = g_type_register_static (GST_TYPE_ALSA, "GstAlsaSink", &alsa_info, 0);
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}
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return alsa_type;
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}
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GType
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gst_alsa_src_get_type (void)
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{
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static GType alsa_type = 0;
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if (!alsa_type) {
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static const GTypeInfo alsa_info = {
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sizeof(GstAlsaClass),
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NULL,
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NULL,
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(GClassInitFunc)gst_alsa_class_init,
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NULL,
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NULL,
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sizeof(GstAlsa),
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0,
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(GInstanceInitFunc)gst_alsa_init,
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};
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alsa_type = g_type_register_static (GST_TYPE_ALSA, "GstAlsaSrc", &alsa_info, 0);
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}
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return alsa_type;
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}
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static GstPadTemplate*
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gst_alsa_src_pad_factory(void)
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{
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static GstPadTemplate *template = NULL;
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if (!template)
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template = gst_padtemplate_new("src", GST_PAD_SRC, GST_PAD_SOMETIMES,
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gst_caps_new("src", "audio/raw", NULL),
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NULL);
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return template;
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}
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static GstPadTemplate*
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gst_alsa_src_request_pad_factory(void)
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{
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static GstPadTemplate *template = NULL;
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if (!template)
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template = gst_padtemplate_new("src%d", GST_PAD_SRC, GST_PAD_REQUEST,
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gst_caps_new("src", "audio/raw",
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gst_props_new("channels", GST_PROPS_INT(1), NULL)),
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NULL);
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return template;
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}
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static GstPadTemplate*
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gst_alsa_sink_pad_factory(void)
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{
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static GstPadTemplate *template = NULL;
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if (!template)
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template = gst_padtemplate_new("sink", GST_PAD_SINK, GST_PAD_SOMETIMES,
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gst_caps_new("sink", "audio/raw", NULL),
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NULL);
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return template;
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}
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static GstPadTemplate*
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gst_alsa_sink_request_pad_factory(void)
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{
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static GstPadTemplate *template = NULL;
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if (!template)
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template = gst_padtemplate_new("sink%d", GST_PAD_SINK, GST_PAD_REQUEST,
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gst_caps_new("sink-request", "audio/raw",
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gst_props_new("channels", GST_PROPS_INT(1), NULL)),
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NULL);
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return template;
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}
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static void
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gst_alsa_class_init(GstAlsaClass *klass)
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{
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GObjectClass *object_class;
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GstElementClass *element_class;
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object_class = (GObjectClass *)klass;
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element_class = (GstElementClass *)klass;
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if (parent_class == NULL)
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parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
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object_class->get_property = gst_alsa_get_property;
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object_class->set_property = gst_alsa_set_property;
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE,
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g_param_spec_string("device","device","alsa device: please see README for details",
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"default",
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G_PARAM_READWRITE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FORMAT,
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g_param_spec_int("format","format","format",
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0, SND_PCM_FORMAT_LAST, SND_PCM_FORMAT_S16,
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G_PARAM_READWRITE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_CHANNELS,
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g_param_spec_int("channels","channels","channels",
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1, 64, 1,
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G_PARAM_READWRITE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_RATE,
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g_param_spec_int("rate","rate","rate",
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8000, 192000, 44100,
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G_PARAM_READWRITE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_PERIODCOUNT,
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g_param_spec_int("period_count","period count","period count",
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2, 64, 2,
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G_PARAM_READWRITE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_PERIODFRAMES,
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g_param_spec_int("period_frames","period frames","period frames",
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64, 4096, 256,
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G_PARAM_READWRITE));
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element_class->change_state = gst_alsa_change_state;
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element_class->request_new_pad = gst_alsa_request_new_pad;
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}
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static void
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gst_alsa_init(GstAlsa *this)
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{
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/* init values */
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this->handle = NULL;
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/* i tried to trim this down to only the essentials needed for proper
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* functioning; we'll be setting this values 'in earnest' when caps come */
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this->rate = 44100;
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this->channels = 2;
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/* i wish i could leave these to defaults, but when caps come and typically
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* the number of channels doubles, you can't have the default count and size
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* that alsa gives you from the pre-caps setup apply to the post-caps setup
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* due to internal hw buffer size restrictions. these values seem to be
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* pretty common, though, although not pushing latency limits */
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this->period_count = 2;
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this->period_frames = 4096;
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this->device = g_strdup("default");
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/* is this right? */
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GST_FLAG_SET(this, GST_ELEMENT_THREAD_SUGGESTED);
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if (G_OBJECT_TYPE(this) == GST_TYPE_ALSA_SRC) {
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this->stream = SND_PCM_STREAM_CAPTURE;
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this->pads = g_list_append(NULL, g_new0(GstAlsaPad, 1));
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GST_ALSA_PAD(this->pads)->pad = gst_pad_new_from_template(gst_alsa_src_pad_factory(), "src");
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this->process = gst_alsa_src_process;
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this->format = SND_PCM_FORMAT_S16; /* native endian */
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} else if (G_OBJECT_TYPE(this) == GST_TYPE_ALSA_SINK) {
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this->stream = SND_PCM_STREAM_PLAYBACK;
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this->pads = g_list_append(NULL, g_new0(GstAlsaPad, 1));
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GST_ALSA_PAD(this->pads)->pad = gst_pad_new_from_template(gst_alsa_sink_pad_factory(), "sink");
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this->process = gst_alsa_sink_process;
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this->format = SND_PCM_FORMAT_UNKNOWN; /* we don't know until caps are
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* set */
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} else {
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g_print("you cannot instantiate an object of type gstalsa. use alsasink or alsasrc instead.\n");
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G_BREAKPOINT();
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return;
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}
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GST_ALSA_PAD(this->pads)->channel = -1;
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this->data_interleaved = TRUE;
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gst_element_add_pad(GST_ELEMENT(this), GST_ALSA_PAD(this->pads)->pad);
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/*gst_pad_set_negotiate_function(GST_ALSA_PAD(this->pads)->pad, gst_alsa_negotiate); */
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gst_element_set_loop_function(GST_ELEMENT(this), gst_alsa_loop);
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}
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static GstPad*
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gst_alsa_request_new_pad (GstElement *element, GstPadTemplate *templ, const gchar *name)
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{
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GstAlsa *this;
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gint channel;
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gchar *newname;
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GList *l;
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GstAlsaPad *pad;
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g_return_val_if_fail ((this = GST_ALSA(element)), NULL);
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/* you can't request a pad if the non-request pad is connected */
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g_return_val_if_fail (this->data_interleaved == FALSE ||
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this->pads == NULL ||
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GST_ALSA_PAD(this->pads) == NULL ||
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GST_ALSA_PAD(this->pads)->pad == NULL ||
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GST_PAD_PEER(GST_ALSA_PAD(this->pads)->pad) == NULL,
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NULL);
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if (name) {
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if (sscanf(name, templ->name_template, &channel) != 1) {
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g_warning("invalid pad name %s (trying to fit with %s)", name,
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templ->name_template);
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return NULL;
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}
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l = this->pads;
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while (l) {
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if (GST_ALSA_PAD(l)->channel == channel) {
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g_warning("requested channel %d already in use.", channel);
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return NULL;
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}
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l = l->next;
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}
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} else {
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l = this->pads;
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channel = 0;
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while (l) {
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if (GST_ALSA_PAD(l)->channel > channel)
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channel = GST_ALSA_PAD(l)->channel;
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l = l->next;
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}
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}
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newname = g_strdup_printf (templ->name_template, channel);
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pad = g_new0(GstAlsaPad, 1);
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pad->channel = channel;
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pad->pad = gst_pad_new_from_template (templ, newname);
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gst_element_add_pad (GST_ELEMENT (this), pad->pad);
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/*gst_pad_set_negotiate_function(pad->pad, gst_alsa_negotiate); */
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if (this->data_interleaved && this->pads) {
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gst_element_remove_pad (GST_ELEMENT (this), GST_ALSA_PAD(this->pads)->pad);
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g_free (GST_ALSA_PAD(this->pads));
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g_list_free (this->pads);
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this->pads = NULL;
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}
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this->pads = g_list_append(this->pads, pad);
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/* FIXME: allow interleaved access (for hw:N,M access on consumer hardware) */
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if (this->data_interleaved) {
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this->channels = pad->channel + 1;
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this->data_interleaved = FALSE;
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} else {
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this->channels = MAX(this->channels, pad->channel + 1);
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}
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return pad->pad;
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}
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static void
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gst_alsa_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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GstAlsa *this;
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this = (GstAlsa *)object;
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switch (prop_id) {
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case ARG_DEVICE:
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if (this->device)
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g_free (this->device);
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this->device = g_strdup(g_value_get_string (value));
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break;
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case ARG_FORMAT:
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this->format = g_value_get_int (value);
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break;
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case ARG_CHANNELS:
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this->channels = g_value_get_int (value);
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break;
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case ARG_RATE:
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this->rate = g_value_get_int (value);
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break;
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case ARG_PERIODCOUNT:
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this->period_count = g_value_get_int (value);
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this->buffer_frames = this->period_count * this->period_frames;
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break;
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case ARG_PERIODFRAMES:
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this->period_frames = g_value_get_int (value);
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this->buffer_frames = this->period_count * this->period_frames;
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break;
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default:
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GST_DEBUG(0, "Unknown arg");
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return;
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}
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if (GST_STATE(this) == GST_STATE_NULL)
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return;
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if (GST_FLAG_IS_SET(this, GST_ALSA_RUNNING)) {
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gst_alsa_stop_audio(this);
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gst_alsa_set_params(this);
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gst_alsa_start_audio(this);
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} else {
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gst_alsa_set_params(this);
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}
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}
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static void
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gst_alsa_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstAlsa *this;
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this = (GstAlsa *)object;
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switch (prop_id) {
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case ARG_DEVICE:
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g_value_set_string (value, this->device);
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break;
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case ARG_FORMAT:
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g_value_set_int (value, this->format);
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break;
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case ARG_CHANNELS:
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g_value_set_int (value, this->channels);
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break;
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case ARG_RATE:
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g_value_set_int (value, this->rate);
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break;
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case ARG_PERIODCOUNT:
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g_value_set_int (value, this->period_count);
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break;
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case ARG_PERIODFRAMES:
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g_value_set_int (value, this->period_frames);
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break;
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default:
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GST_DEBUG(0, "Unknown arg");
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break;
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}
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}
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static GstElementStateReturn
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gst_alsa_change_state(GstElement *element)
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{
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GstAlsa *this;
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guint chn;
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g_return_val_if_fail(element != NULL, FALSE);
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this = GST_ALSA (element);
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switch (GST_STATE_PENDING(element)) {
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case GST_STATE_NULL:
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if (GST_FLAG_IS_SET(element, GST_ALSA_RUNNING))
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gst_alsa_stop_audio((GstAlsa *)element);
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if (GST_FLAG_IS_SET(element, GST_ALSA_OPEN))
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gst_alsa_close_audio((GstAlsa *)element);
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/* FIXME: clean up bytestreams, etc */
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break;
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case GST_STATE_READY:
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break;
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case GST_STATE_PAUSED:
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if (GST_FLAG_IS_SET(element, GST_ALSA_OPEN) == FALSE)
|
|
if (gst_alsa_open_audio((GstAlsa *)element) == FALSE)
|
|
return GST_STATE_FAILURE;
|
|
if (GST_FLAG_IS_SET(element, GST_ALSA_RUNNING)) {
|
|
if (this->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
for (chn = 0; chn < this->channels; chn++) {
|
|
gst_alsa_sink_silence_on_channel (this, chn, this->avail);
|
|
}
|
|
}
|
|
gst_alsa_stop_audio((GstAlsa *)element);
|
|
}
|
|
break;
|
|
|
|
case GST_STATE_PLAYING:
|
|
if (GST_FLAG_IS_SET(element, GST_ALSA_RUNNING) == FALSE)
|
|
if (gst_alsa_start_audio((GstAlsa *)element) == FALSE)
|
|
return GST_STATE_FAILURE;
|
|
break;
|
|
}
|
|
|
|
if (GST_ELEMENT_CLASS(parent_class)->change_state)
|
|
return GST_ELEMENT_CLASS(parent_class)->change_state(element);
|
|
|
|
return GST_STATE_SUCCESS;
|
|
}
|
|
|
|
static gboolean
|
|
gst_alsa_parse_caps (GstAlsa *this, GstCaps *caps)
|
|
{
|
|
gint law, endianness, width, depth, channels;
|
|
gboolean sign;
|
|
gint format = -1;
|
|
const gchar* format_name;
|
|
|
|
gst_caps_get_string(caps, "format", &format_name);
|
|
|
|
if (format_name == NULL) {
|
|
return FALSE;
|
|
} else if (strcmp(format_name, "int")==0) {
|
|
gst_caps_get_int (caps, "width", &width);
|
|
gst_caps_get_int (caps, "depth", &depth);
|
|
|
|
gst_caps_get_int (caps, "law", &law);
|
|
gst_caps_get_int (caps, "endianness", &endianness);
|
|
gst_caps_get_boolean (caps, "signed", &sign);
|
|
|
|
if (law == 0) {
|
|
if (width == 8) {
|
|
if (sign == TRUE) {
|
|
format = SND_PCM_FORMAT_S8;
|
|
} else {
|
|
format = SND_PCM_FORMAT_U8;
|
|
}
|
|
} else if (width == 16) {
|
|
if (sign == TRUE) {
|
|
if (endianness == G_LITTLE_ENDIAN)
|
|
format = SND_PCM_FORMAT_S16_LE;
|
|
else if (endianness == G_BIG_ENDIAN)
|
|
format = SND_PCM_FORMAT_S16_BE;
|
|
} else {
|
|
if (endianness == G_LITTLE_ENDIAN)
|
|
format = SND_PCM_FORMAT_U16_LE;
|
|
else if (endianness == G_BIG_ENDIAN)
|
|
format = SND_PCM_FORMAT_U16_BE;
|
|
}
|
|
} else if (width == 24) {
|
|
if (sign == TRUE) {
|
|
if (endianness == G_LITTLE_ENDIAN)
|
|
format = SND_PCM_FORMAT_S24_LE;
|
|
else if (endianness == G_BIG_ENDIAN)
|
|
format = SND_PCM_FORMAT_S24_BE;
|
|
} else {
|
|
if (endianness == G_LITTLE_ENDIAN)
|
|
format = SND_PCM_FORMAT_U24_LE;
|
|
else if (endianness == G_BIG_ENDIAN)
|
|
format = SND_PCM_FORMAT_U24_BE;
|
|
}
|
|
} else if (width == 32) {
|
|
if (sign == TRUE) {
|
|
if (endianness == G_LITTLE_ENDIAN)
|
|
format = SND_PCM_FORMAT_S32_LE;
|
|
else if (endianness == G_BIG_ENDIAN)
|
|
format = SND_PCM_FORMAT_S32_BE;
|
|
} else {
|
|
if (endianness == G_LITTLE_ENDIAN)
|
|
format = SND_PCM_FORMAT_U32_LE;
|
|
else if (endianness == G_BIG_ENDIAN)
|
|
format = SND_PCM_FORMAT_U32_BE;
|
|
}
|
|
}
|
|
} else if (law == 1) { /* mu law */
|
|
if (width == depth && width == 8 && sign == FALSE) {
|
|
format = SND_PCM_FORMAT_MU_LAW;
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
} else if (law == 2) { /* a law, ug. */
|
|
if (width == depth && width == 8 && sign == FALSE) {
|
|
format = SND_PCM_FORMAT_A_LAW;
|
|
}
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
} else if (strcmp(format_name, "float")==0) {
|
|
const gchar *layout;
|
|
|
|
gst_caps_get_string(caps, "layout", &layout);
|
|
|
|
if (strcmp(layout, "gfloat")==0) {
|
|
format = SND_PCM_FORMAT_FLOAT;
|
|
} else {
|
|
return FALSE;
|
|
/* if you need float64, chat w/ me on irc.gstreamer.net and i'll tell you what needs to
|
|
* be done. i'm 'wingo'. */
|
|
}
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
|
|
this->format = format;
|
|
gst_caps_get_int(caps, "rate", &this->rate);
|
|
gst_caps_get_int(caps, "channels", &channels);
|
|
|
|
if (this->data_interleaved)
|
|
this->channels = channels;
|
|
else if (channels != 1)
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* caps are so painful sometimes. */
|
|
static GstCaps*
|
|
gst_alsa_caps (GstAlsa *this)
|
|
{
|
|
gint law, endianness, width, depth;
|
|
gboolean sign;
|
|
GstProps *props;
|
|
|
|
g_return_val_if_fail (this != NULL && this->handle != NULL, NULL);
|
|
|
|
if (this->format == SND_PCM_FORMAT_FLOAT) {
|
|
props = gst_props_new ("format", GST_PROPS_STRING ("float"),
|
|
"layout", GST_PROPS_STRING ("gfloat"),
|
|
"rate", GST_PROPS_INT (this->rate),
|
|
"channels", GST_PROPS_INT ((this->data_interleaved ? this->channels : 1)),
|
|
NULL);
|
|
} else {
|
|
/* we'll just have to assume int, i don't feel like checking */
|
|
if (this->format == SND_PCM_FORMAT_MU_LAW) {
|
|
law = 1;
|
|
width = 8;
|
|
sign = FALSE;
|
|
endianness = 0;
|
|
} else if (this->format == SND_PCM_FORMAT_A_LAW) {
|
|
law = 2;
|
|
width = 8;
|
|
sign = FALSE;
|
|
endianness = 0;
|
|
} else {
|
|
law = 0;
|
|
if (this->format == SND_PCM_FORMAT_S8) {
|
|
width = 8;
|
|
sign = TRUE;
|
|
endianness = 0;
|
|
} else if (this->format == SND_PCM_FORMAT_U8) {
|
|
width = 8;
|
|
sign = FALSE;
|
|
endianness = 0;
|
|
} else if (this->format == SND_PCM_FORMAT_S16_LE) {
|
|
width = 16;
|
|
sign = TRUE;
|
|
endianness = G_LITTLE_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_S16_BE) {
|
|
width = 16;
|
|
sign = TRUE;
|
|
endianness = G_BIG_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_U16_LE) {
|
|
width = 16;
|
|
sign = FALSE;
|
|
endianness = G_LITTLE_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_U16_BE) {
|
|
width = 16;
|
|
sign = FALSE;
|
|
endianness = G_BIG_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_S24_LE) {
|
|
width = 24;
|
|
sign = TRUE;
|
|
endianness = G_LITTLE_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_S24_BE) {
|
|
width = 24;
|
|
sign = TRUE;
|
|
endianness = G_BIG_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_U24_LE) {
|
|
width = 24;
|
|
sign = FALSE;
|
|
endianness = G_LITTLE_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_U24_BE) {
|
|
width = 24;
|
|
sign = FALSE;
|
|
endianness = G_BIG_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_S32_LE) {
|
|
width = 32;
|
|
sign = TRUE;
|
|
endianness = G_LITTLE_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_S32_BE) {
|
|
width = 32;
|
|
sign = TRUE;
|
|
endianness = G_BIG_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_U32_LE) {
|
|
width = 32;
|
|
sign = FALSE;
|
|
endianness = G_LITTLE_ENDIAN;
|
|
} else if (this->format == SND_PCM_FORMAT_U32_BE) {
|
|
width = 32;
|
|
sign = FALSE;
|
|
endianness = G_BIG_ENDIAN;
|
|
} else {
|
|
g_error ("what is going on here?");
|
|
return NULL;
|
|
}
|
|
}
|
|
depth = width;
|
|
props = gst_props_new ("format", GST_PROPS_STRING ("int"),
|
|
"rate", GST_PROPS_INT (this->rate),
|
|
"channels", GST_PROPS_INT ((this->data_interleaved ? this->channels : 1)),
|
|
"law", GST_PROPS_INT (law),
|
|
"endianness", GST_PROPS_INT (endianness),
|
|
"signed", GST_PROPS_BOOLEAN (sign),
|
|
"width", GST_PROPS_INT (width),
|
|
"depth", GST_PROPS_INT (depth),
|
|
NULL);
|
|
}
|
|
|
|
return gst_caps_new ("alsasrc", "audio/raw", props);
|
|
}
|
|
|
|
/*
|
|
* Negotiates the caps, "borrowed" from gstosssink.c
|
|
*/
|
|
#if 0
|
|
GstPadNegotiateReturn
|
|
gst_alsa_negotiate(GstPad *pad, GstCaps **caps, gpointer *user_data)
|
|
{
|
|
GstAlsa *this;
|
|
gboolean need_mmap;
|
|
|
|
g_return_val_if_fail (pad != NULL, GST_PAD_NEGOTIATE_FAIL);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_NEGOTIATE_FAIL);
|
|
|
|
this = GST_ALSA(gst_pad_get_parent(pad));
|
|
|
|
/* we decide */
|
|
if (user_data == NULL) {
|
|
*caps = NULL;
|
|
return GST_PAD_NEGOTIATE_TRY;
|
|
}
|
|
/* have we got caps? */
|
|
else if (*caps) {
|
|
if (this->handle == NULL)
|
|
if (!gst_alsa_open_audio(this))
|
|
return GST_PAD_NEGOTIATE_FAIL;
|
|
|
|
if (gst_alsa_parse_caps(this, *caps)) {
|
|
need_mmap = this->mmap_open;
|
|
|
|
/* sync the params */
|
|
if (GST_FLAG_IS_SET(this, GST_ALSA_RUNNING))
|
|
gst_alsa_stop_audio(this);
|
|
|
|
if (GST_FLAG_IS_SET(this, GST_ALSA_OPEN))
|
|
gst_alsa_close_audio(this);
|
|
|
|
/* FIXME send out another caps if nego fails */
|
|
|
|
if (!gst_alsa_open_audio(this))
|
|
return GST_PAD_NEGOTIATE_FAIL;
|
|
|
|
if (!gst_alsa_start_audio(this))
|
|
return GST_PAD_NEGOTIATE_FAIL;
|
|
|
|
if (need_mmap && !gst_alsa_get_channel_addresses(this))
|
|
return GST_PAD_NEGOTIATE_FAIL;
|
|
|
|
return GST_PAD_NEGOTIATE_AGREE;
|
|
}
|
|
|
|
return GST_PAD_NEGOTIATE_FAIL;
|
|
}
|
|
|
|
return GST_PAD_NEGOTIATE_FAIL;
|
|
}
|
|
#endif
|
|
|
|
/* shamelessly stolen from pbd's audioengine. thanks, paul! */
|
|
static void
|
|
gst_alsa_loop (GstElement *element)
|
|
{
|
|
struct pollfd pfd;
|
|
gboolean xrun_detected;
|
|
guint32 i;
|
|
GstAlsa *this = GST_ALSA(element);
|
|
|
|
g_return_if_fail(this != NULL);
|
|
|
|
snd_pcm_poll_descriptors (this->handle, &pfd, 1);
|
|
|
|
if (this->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
pfd.events = POLLOUT | POLLERR;
|
|
} else {
|
|
pfd.events = POLLIN | POLLERR;
|
|
}
|
|
|
|
do {
|
|
if (poll (&pfd, 1, 1000) < 0) {
|
|
if (errno == EINTR) {
|
|
/* this happens mostly when run
|
|
* under gdb, or when exiting due to a signal */
|
|
g_print ("EINTR\n");
|
|
continue;
|
|
}
|
|
|
|
g_warning("poll call failed (%s)", strerror(errno));
|
|
return;
|
|
}
|
|
|
|
if (pfd.revents & POLLERR) {
|
|
g_warning("alsa: poll reports error.");
|
|
return;
|
|
}
|
|
|
|
if (pfd.revents == 0) {
|
|
g_print ("poll on alsa %s device \"%s\" timed out\n",
|
|
this->stream==SND_PCM_STREAM_CAPTURE ? "capture" : "playback",
|
|
this->device);
|
|
/* timed out, such as when the device is paused */
|
|
continue;
|
|
}
|
|
|
|
xrun_detected = FALSE;
|
|
|
|
this->avail = snd_pcm_avail_update (this->handle);
|
|
/* g_print ("snd_pcm_avail_update() = %d\n", this->avail); */
|
|
|
|
if (this->avail < 0) {
|
|
if (this->avail == -EPIPE) {
|
|
xrun_detected = TRUE;
|
|
} else {
|
|
g_warning("unknown ALSA avail_update return value (%d)",
|
|
(int)this->avail);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* pretty sophisticated eh? */
|
|
if (xrun_detected)
|
|
g_warning ("xrun detected");
|
|
|
|
/* we need to loop here because the available bytes might not be
|
|
* contiguous */
|
|
while (this->avail) {
|
|
/* changes this->avail, as a side effect */
|
|
if (!gst_alsa_get_channel_addresses (this) < 0) {
|
|
g_error("could not get channels");
|
|
return;
|
|
}
|
|
|
|
if (this->mute && this->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
for (i = 0; i < this->channels; i++) {
|
|
if (this->mute & (1<<i)) {
|
|
gst_alsa_sink_silence_on_channel (this, i, this->buffer_frames);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!this->process(this, this->avail)) {
|
|
g_warning("alsa: something happened while processing audio");
|
|
return;
|
|
}
|
|
|
|
/* we could have released the mmap regions on a state change */
|
|
if (this->mmap_open)
|
|
gst_alsa_release_channel_addresses(this);
|
|
}
|
|
gst_element_yield (element);
|
|
} while (TRUE);
|
|
}
|
|
|
|
static gboolean
|
|
gst_alsa_src_process (GstAlsa *this, snd_pcm_uframes_t frames)
|
|
{
|
|
GstBuffer *buf;
|
|
GList *l;
|
|
GstAlsaPad *pad = NULL;
|
|
GstCaps *caps;
|
|
gint unit;
|
|
/* gint i=0; */
|
|
|
|
static gboolean caps_set = FALSE;
|
|
|
|
if (!caps_set) {
|
|
/* let's get on the caps-setting merry-go-round! */
|
|
caps = gst_alsa_caps(this);
|
|
l = this->pads;
|
|
while (l) {
|
|
if (!gst_pad_try_set_caps (GST_ALSA_PAD(l)->pad, caps)) {
|
|
g_print ("DANGER WILL ROBINSON!\n");
|
|
sleep(1);
|
|
return FALSE;
|
|
}
|
|
|
|
l = l->next;
|
|
}
|
|
caps_set = TRUE;
|
|
}
|
|
|
|
unit = this->sample_bytes * (this->data_interleaved ? this->channels : 1);
|
|
|
|
while (frames) {
|
|
/* g_print ("(%d) frames to process: %d\n", i++, frames); */
|
|
l = this->pads;
|
|
while (l) {
|
|
pad = GST_ALSA_PAD(l);
|
|
|
|
if (!pad->buf) {
|
|
pad->buf = g_malloc(this->period_frames * unit);
|
|
/* g_print ("created buffer %p of size %d\n", pad->buf, this->period_frames * unit); */
|
|
}
|
|
/*
|
|
g_print ("pad->buf = %p, offset = %d\n", pad->buf, pad->offset);
|
|
g_print ("about to memcpy(%p, %p, %d)\n",
|
|
pad->buf + pad->offset * unit,
|
|
pad->access_addr,
|
|
MIN(frames, this->period_frames - pad->offset) * unit);
|
|
*/
|
|
memcpy(pad->buf + pad->offset * unit,
|
|
pad->access_addr,
|
|
MIN(frames, this->period_frames - pad->offset) * unit);
|
|
|
|
pad->offset += MIN(frames, this->period_frames - pad->offset);
|
|
|
|
if (pad->offset >= this->period_frames) {
|
|
if (pad->offset > this->period_frames)
|
|
G_BREAKPOINT();
|
|
|
|
buf = gst_buffer_new();
|
|
GST_BUFFER_DATA(buf) = pad->buf;
|
|
GST_BUFFER_SIZE(buf) = this->period_frames * unit;
|
|
GST_BUFFER_MAXSIZE(buf) = this->period_frames * unit;
|
|
gst_pad_push(pad->pad, buf);
|
|
pad->buf = NULL;
|
|
pad->offset = 0;
|
|
}
|
|
l = l->next;
|
|
}
|
|
frames -= MIN(frames, this->period_frames - pad->offset); /* shouldn't */
|
|
/* matter which pad, in theory (tm) */
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_alsa_sink_process (GstAlsa *this, snd_pcm_uframes_t frames)
|
|
{
|
|
guint8 *peeked;
|
|
guint32 len, avail;
|
|
GstEvent *event = NULL;
|
|
GList *l;
|
|
|
|
/* this is necessary because the sample_bytes will change, probably, when
|
|
* caps are set, which will occur after the first bytestream_peek. we
|
|
* underestimate the amount of data we will need by peeking 'frames' only.
|
|
* */
|
|
|
|
if (!this->sample_bytes) {
|
|
if (!GST_ALSA_PAD(this->pads)->bs)
|
|
GST_ALSA_PAD(this->pads)->bs = gst_bytestream_new(GST_ALSA_PAD(this->pads)->pad);
|
|
|
|
if (!(peeked = gst_bytestream_peek_bytes(GST_ALSA_PAD(this->pads)->bs, frames))) {
|
|
g_warning("initial pull on pad %s returned NULL", GST_OBJECT_NAME(GST_ALSA_PAD(this->pads)->pad));
|
|
gst_element_set_state(GST_ELEMENT(this), GST_STATE_PAUSED);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!this->sample_bytes) {
|
|
g_critical ("alsa plugin requires a pipeline that can adequately set caps.");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
len = frames * this->channels * this->sample_bytes;
|
|
|
|
l = this->pads;
|
|
while (l) {
|
|
if (!GST_ALSA_PAD(this->pads)->bs)
|
|
GST_ALSA_PAD(this->pads)->bs = gst_bytestream_new(GST_ALSA_PAD(this->pads)->pad);
|
|
|
|
if (!(peeked = gst_bytestream_peek_bytes(GST_ALSA_PAD(this->pads)->bs, len))) {
|
|
gst_bytestream_get_status(GST_ALSA_PAD(this->pads)->bs, &avail, &event);
|
|
if (event) {
|
|
g_warning("got an event on alsasink");
|
|
if (GST_EVENT_TYPE(event) == GST_EVENT_EOS) {
|
|
/* really, we should just cut this pad out of the graph. let
|
|
* me know when this is needed ;)
|
|
* also, for sample accuracy etc, we should play avail
|
|
* bytes, but hey. */
|
|
gst_element_set_eos(GST_ELEMENT(this));
|
|
gst_event_free(event);
|
|
return TRUE;
|
|
}
|
|
} else {
|
|
/* the element at the top of the chain did not emit an eos
|
|
* event. this is a Bug(tm) */
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
memcpy(GST_ALSA_PAD(this->pads)->access_addr, peeked, len);
|
|
gst_bytestream_flush(GST_ALSA_PAD(this->pads)->bs, len);
|
|
|
|
l=l->next;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* taken more or less from pbd's audioengine code */
|
|
static gboolean
|
|
gst_alsa_set_params (GstAlsa *this)
|
|
{
|
|
snd_pcm_sw_params_t *sw_param;
|
|
snd_pcm_hw_params_t *hw_param;
|
|
snd_pcm_access_mask_t *mask;
|
|
gint ret;
|
|
|
|
g_return_val_if_fail(this != NULL, FALSE);
|
|
g_return_val_if_fail(this->handle != NULL, FALSE);
|
|
|
|
g_print("Preparing channel: %s %dHz, %d channels\n",
|
|
snd_pcm_format_name(this->format),
|
|
this->rate, this->channels);
|
|
|
|
snd_pcm_hw_params_alloca(&hw_param);
|
|
snd_pcm_sw_params_alloca(&sw_param);
|
|
|
|
ret = snd_pcm_hw_params_any(this->handle, hw_param);
|
|
if (ret < 0) {
|
|
g_warning("Broken configuration for this PCM: no configurations available");
|
|
return FALSE;
|
|
}
|
|
|
|
if ((ret = snd_pcm_hw_params_set_periods_integer (this->handle, hw_param)) < 0) {
|
|
g_warning("cannot restrict period size to integral value.");
|
|
return FALSE;
|
|
}
|
|
|
|
mask = alloca(snd_pcm_access_mask_sizeof());
|
|
snd_pcm_access_mask_none(mask);
|
|
|
|
if (this->data_interleaved)
|
|
snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_INTERLEAVED);
|
|
|
|
snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_NONINTERLEAVED);
|
|
ret = snd_pcm_hw_params_set_access_mask(this->handle, hw_param, mask);
|
|
if (ret < 0) {
|
|
g_warning("the gstreamer alsa plugin does not support your hardware.");
|
|
return FALSE;
|
|
}
|
|
|
|
if (this->format != SND_PCM_FORMAT_UNKNOWN) {
|
|
ret = snd_pcm_hw_params_set_format(this->handle, hw_param, this->format);
|
|
if (ret < 0) {
|
|
g_warning("Sample format (%s) not available: %s", snd_pcm_format_name(this->format), snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
this->sample_bytes = snd_pcm_format_physical_width(this->format) / 8;
|
|
}
|
|
|
|
ret = snd_pcm_hw_params_set_channels(this->handle, hw_param, this->channels);
|
|
if (ret < 0) {
|
|
g_warning("Channels count (%d) not available: %s", this->channels, snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
this->channels = snd_pcm_hw_params_get_channels(hw_param);
|
|
|
|
if (this->rate) {
|
|
ret = snd_pcm_hw_params_set_rate(this->handle, hw_param, this->rate, 0);
|
|
if (ret < 0) {
|
|
g_warning("error setting rate (%d): %s", this->rate, snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
if (this->period_count) {
|
|
ret = snd_pcm_hw_params_set_periods (this->handle, hw_param, this->period_count, 0);
|
|
if (ret < 0) {
|
|
g_warning("error setting period count minimum (%d): %s", this->period_count, snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
if (this->period_frames) {
|
|
ret = snd_pcm_hw_params_set_period_size (this->handle, hw_param, this->period_frames, 0);
|
|
if (ret < 0) {
|
|
g_warning("error setting period in frames (%d): %s", this->period_frames, snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
if (this->buffer_frames) {
|
|
ret = snd_pcm_hw_params_set_buffer_size (this->handle, hw_param, this->buffer_frames);
|
|
if (ret < 0) {
|
|
g_warning("error setting buffer size (%d): %s", this->buffer_frames, snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
ret = snd_pcm_hw_params(this->handle, hw_param);
|
|
if (ret < 0) {
|
|
g_warning("could not set hw params: %s", snd_strerror(ret));
|
|
snd_pcm_hw_params_dump(hw_param, this->out);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!this->rate)
|
|
this->rate = snd_pcm_hw_params_get_rate(hw_param, 0);
|
|
if (!this->format)
|
|
this->format = snd_pcm_hw_params_get_format(hw_param);
|
|
if (!this->period_count)
|
|
this->period_count = snd_pcm_hw_params_get_periods(hw_param, 0);
|
|
if (!this->period_frames)
|
|
this->period_frames = snd_pcm_hw_params_get_period_size(hw_param, 0);
|
|
if (!this->buffer_frames)
|
|
this->buffer_frames = snd_pcm_hw_params_get_buffer_size(hw_param);
|
|
if (this->buffer_frames != this->period_count * this->period_frames)
|
|
g_critical ("buffer size != period size * number of periods, unexpected things may happen!");
|
|
|
|
snd_pcm_sw_params_current (this->handle, sw_param);
|
|
|
|
ret = snd_pcm_sw_params_set_start_threshold (this->handle, sw_param, ~0U);
|
|
if (ret < 0) {
|
|
g_warning("could not set start mode: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
ret = snd_pcm_sw_params_set_stop_threshold (this->handle, sw_param, ~0U);
|
|
if (ret < 0) {
|
|
g_warning("could not set stop mode: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
ret = snd_pcm_sw_params_set_silence_threshold (this->handle, sw_param, 0);
|
|
if (ret < 0) {
|
|
g_warning("could not set silence threshold: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
ret = snd_pcm_sw_params_set_silence_size (this->handle, sw_param, this->buffer_frames);
|
|
if (ret < 0) {
|
|
g_warning("could not set silence size: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
ret = snd_pcm_sw_params_set_avail_min (this->handle, sw_param, this->period_frames);
|
|
if (ret < 0) {
|
|
g_warning("could not set avail min: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
ret = snd_pcm_sw_params (this->handle, sw_param);
|
|
if (ret < 0) {
|
|
g_warning("could not set sw_params: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
snd_pcm_dump(this->handle, this->out);
|
|
|
|
this->access_interleaved = !(snd_pcm_hw_params_get_access (hw_param) ==
|
|
SND_PCM_ACCESS_MMAP_NONINTERLEAVED);
|
|
|
|
if (this->access_interleaved) {
|
|
this->interleave_unit = this->sample_bytes;
|
|
this->interleave_skip = this->interleave_unit * this->channels;
|
|
} else {
|
|
this->interleave_unit = 0; /* not used */
|
|
this->interleave_skip = this->sample_bytes;
|
|
}
|
|
|
|
if (this->access_addr)
|
|
g_free (this->access_addr);
|
|
this->access_addr = g_new0 (char*, this->channels);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_alsa_open_audio(GstAlsa *this)
|
|
{
|
|
gint ret;
|
|
g_assert(this != NULL);
|
|
|
|
if (this->handle)
|
|
gst_alsa_close_audio(this);
|
|
|
|
g_print("Opening alsa device \"%s\" for %s...\n", this->device,
|
|
this->stream==SND_PCM_STREAM_PLAYBACK ? "playback" : "capture");
|
|
|
|
ret = snd_output_stdio_attach(&this->out, stdout, 0);
|
|
if (ret < 0) {
|
|
g_print("error opening log output: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
/* blocking i/o */
|
|
if ((ret = snd_pcm_open(&this->handle, this->device, this->stream, 0))) {
|
|
g_print("error opening pcm device: %s", snd_strerror(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
if (gst_alsa_set_params(this) == FALSE) {
|
|
gst_alsa_close_audio(this);
|
|
return FALSE;
|
|
}
|
|
|
|
GST_FLAG_SET(this, GST_ALSA_OPEN);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
gst_alsa_start_audio(GstAlsa *this)
|
|
{
|
|
gint err;
|
|
guint32 chn;
|
|
|
|
g_return_val_if_fail(this != NULL, FALSE);
|
|
g_return_val_if_fail(this->handle != NULL, FALSE);
|
|
|
|
if ((err = snd_pcm_prepare (this->handle)) < 0) {
|
|
g_warning("channel prepare failed: %s", snd_strerror (err));
|
|
return FALSE;
|
|
}
|
|
|
|
this->avail = snd_pcm_avail_update (this->handle);
|
|
|
|
if (this->stream == SND_PCM_STREAM_PLAYBACK &&
|
|
this->avail != this->buffer_frames) {
|
|
g_warning ("full buffer not available at start");
|
|
return FALSE;
|
|
}
|
|
|
|
if (!gst_alsa_get_channel_addresses (this)) {
|
|
return FALSE;
|
|
}
|
|
|
|
if (this->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
for (chn = 0; chn < this->channels; chn++) {
|
|
gst_alsa_sink_silence_on_channel (this, chn, this->buffer_frames);
|
|
}
|
|
}
|
|
|
|
gst_alsa_release_channel_addresses (this);
|
|
|
|
if ((err = snd_pcm_start (this->handle)) < 0) {
|
|
g_warning("could not start audio: %s", snd_strerror (err));
|
|
return FALSE;
|
|
}
|
|
|
|
GST_FLAG_SET(this, GST_ALSA_RUNNING);
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gst_alsa_stop_audio(GstAlsa *this)
|
|
{
|
|
gint err;
|
|
g_assert(this != NULL);
|
|
|
|
g_return_if_fail(this != NULL);
|
|
g_return_if_fail(this->handle != NULL);
|
|
|
|
if (this->mmap_open)
|
|
gst_alsa_release_channel_addresses (this);
|
|
|
|
if (this->stream == SND_PCM_STREAM_PLAYBACK &&
|
|
(err = snd_pcm_drop (this->handle)) < 0) {
|
|
g_warning("channel flush failed: %s", snd_strerror (err));
|
|
return;
|
|
}
|
|
|
|
GST_FLAG_UNSET(this, GST_ALSA_RUNNING);
|
|
}
|
|
|
|
static void
|
|
gst_alsa_close_audio(GstAlsa *this)
|
|
{
|
|
/* gint err; */
|
|
g_return_if_fail(this != NULL);
|
|
g_return_if_fail(this->handle != NULL);
|
|
|
|
/* if ((err = snd_pcm_drop (this->handle)) < 0) {
|
|
g_warning("channel flush for failed: %s", snd_strerror (err));
|
|
return;
|
|
} */
|
|
|
|
snd_pcm_close(this->handle);
|
|
|
|
this->handle = NULL;
|
|
|
|
GST_FLAG_UNSET(this, GST_ALSA_OPEN);
|
|
}
|
|
|
|
static gboolean
|
|
gst_alsa_get_channel_addresses (GstAlsa *this)
|
|
{
|
|
guint32 err, i;
|
|
const snd_pcm_channel_area_t *a;
|
|
GList *l;
|
|
|
|
g_return_val_if_fail (this->mmap_open == FALSE, FALSE);
|
|
|
|
if ((err = snd_pcm_mmap_begin (this->handle, &this->mmap_areas, &this->offset, &this->avail)) < 0) {
|
|
g_warning("gstalsa: mmap failed: %s", snd_strerror(err));
|
|
return FALSE;
|
|
}
|
|
|
|
GST_DEBUG(0, "got %d mmap'd frames", (int)this->avail);
|
|
|
|
/* g_print ("snd_pcm_mmap_begin() sets avail = %d\n", this->avail); */
|
|
|
|
l = this->pads;
|
|
while (l) {
|
|
a = &this->mmap_areas[GST_ALSA_PAD(l)->channel > 0 ?
|
|
GST_ALSA_PAD(l)->channel-1 : 0];
|
|
GST_ALSA_PAD(l)->access_addr = (char *) a->addr + ((a->first + a->step *
|
|
this->offset) / 8);
|
|
l = l->next;
|
|
}
|
|
|
|
for (i=0; i<this->channels; i++) {
|
|
a = &this->mmap_areas[i];
|
|
this->access_addr[i] = (char *) a->addr + ((a->first + a->step * this->offset) / 8);
|
|
}
|
|
|
|
this->mmap_open = TRUE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gst_alsa_release_channel_addresses (GstAlsa *this)
|
|
{
|
|
guint32 err, i;
|
|
GList *l;
|
|
|
|
g_return_if_fail (this->mmap_open == TRUE);
|
|
|
|
GST_DEBUG(0, "releasing mmap'd data region: %d frames", (int)this->avail);
|
|
|
|
if ((err = snd_pcm_mmap_commit (this->handle, this->offset, this->avail)) < 0) {
|
|
g_warning("gstalsa: mmap commit failed: %s", snd_strerror(err));
|
|
return;
|
|
}
|
|
|
|
l = this->pads;
|
|
while (l) {
|
|
GST_ALSA_PAD(l)->access_addr = NULL;
|
|
l = l->next;
|
|
}
|
|
|
|
for (i=0; i<this->channels; i++) {
|
|
this->access_addr[i] = NULL;
|
|
}
|
|
|
|
this->mmap_open = FALSE;
|
|
this->avail=0;
|
|
}
|
|
|
|
static void
|
|
gst_alsa_sink_silence_on_channel (GstAlsa *this, guint32 chn, guint32 nframes)
|
|
{
|
|
if (this->access_interleaved) {
|
|
memset_interleave
|
|
(this->access_addr[chn],
|
|
0, nframes * this->sample_bytes,
|
|
this->interleave_unit,
|
|
this->interleave_skip);
|
|
} else {
|
|
memset (this->access_addr[chn], 0, nframes * this->sample_bytes);
|
|
}
|
|
/* mark_channel_done (chn); */
|
|
}
|
|
|
|
/* taken directly from paul davis' memops.cc */
|
|
static void
|
|
memset_interleave (char *dst, char val, unsigned int bytes,
|
|
unsigned int unit_bytes,
|
|
unsigned int skip_bytes)
|
|
{
|
|
switch (unit_bytes) {
|
|
case 1:
|
|
while (bytes--) {
|
|
*dst = val;
|
|
dst += skip_bytes;
|
|
}
|
|
break;
|
|
case 2:
|
|
while (bytes) {
|
|
*((short *) dst) = (short) val;
|
|
dst += skip_bytes;
|
|
bytes -= 2;
|
|
}
|
|
break;
|
|
case 4:
|
|
while (bytes) {
|
|
*((int *) dst) = (int) val;
|
|
dst += skip_bytes;
|
|
bytes -= 4;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
plugin_init (GModule *module, GstPlugin *plugin)
|
|
{
|
|
GstElementFactory *factory;
|
|
|
|
if (!gst_library_load ("gstbytestream")) {
|
|
gst_info("alsa: could not load support library: 'gstbytestream'\n");
|
|
return FALSE;
|
|
}
|
|
|
|
factory = gst_elementfactory_new ("alsasrc", GST_TYPE_ALSA_SRC, &gst_alsa_src_details);
|
|
g_return_val_if_fail (factory != NULL, FALSE);
|
|
gst_elementfactory_add_padtemplate (factory, gst_alsa_src_pad_factory());
|
|
gst_elementfactory_add_padtemplate (factory, gst_alsa_src_request_pad_factory());
|
|
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
|
|
|
|
factory = gst_elementfactory_new ("alsasink", GST_TYPE_ALSA_SINK, &gst_alsa_sink_details);
|
|
g_return_val_if_fail (factory != NULL, FALSE);
|
|
gst_elementfactory_add_padtemplate (factory, gst_alsa_sink_pad_factory());
|
|
gst_elementfactory_add_padtemplate (factory, gst_alsa_sink_request_pad_factory());
|
|
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
|
|
|
|
gst_plugin_set_longname(plugin, "ALSA plugin library");
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
GstPluginDesc plugin_desc = {
|
|
GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
"alsa",
|
|
plugin_init
|
|
};
|
|
|
|
|