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9b6f3ad0c8
Original commit message from CVS: * gst/adder/gstadder.c: Change author string after seeing output of gst-inspector.
1029 lines
30 KiB
C
1029 lines
30 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2001 Thomas <thomas@apestaart.org>
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* 2005,2006 Wim Taymans <wim@fluendo.com>
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*
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* adder.c: Adder element, N in, one out, samples are added
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*
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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 Library 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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*
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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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-adder
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*
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* The adder allows to mix several streams into one by adding the data.
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* Mixed data is clamped to the min/max values of the data format.
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*
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* The adder currently mixes all data received on the sinkpads as soon as
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* possible without trying to synchronize the streams.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch audiotestsrc freq=100 ! adder name=mix ! audioconvert ! alsasink audiotestsrc freq=500 ! mix.
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* ]| This pipeline produces two sine waves mixed together.
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* </refsect2>
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*
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* Last reviewed on 2006-05-09 (0.10.7)
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*/
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/* Element-Checklist-Version: 5 */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstadder.h"
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#include <gst/audio/audio.h>
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#include <string.h> /* strcmp */
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/* highest positive/lowest negative x-bit value we can use for clamping */
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#define MAX_INT_32 ((gint32) (0x7fffffff))
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#define MAX_INT_16 ((gint16) (0x7fff))
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#define MAX_INT_8 ((gint8) (0x7f))
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#define MAX_UINT_32 ((guint32)(0xffffffff))
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#define MAX_UINT_16 ((guint16)(0xffff))
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#define MAX_UINT_8 ((guint8) (0xff))
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#define MIN_INT_32 ((gint32) (0x80000000))
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#define MIN_INT_16 ((gint16) (0x8000))
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#define MIN_INT_8 ((gint8) (0x80))
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#define MIN_UINT_32 ((guint32)(0x00000000))
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#define MIN_UINT_16 ((guint16)(0x0000))
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#define MIN_UINT_8 ((guint8) (0x00))
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#define GST_CAT_DEFAULT gst_adder_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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/* elementfactory information */
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#define CAPS \
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"audio/x-raw-int, " \
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"rate = (int) [ 1, MAX ], " \
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"channels = (int) [ 1, MAX ], " \
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"endianness = (int) BYTE_ORDER, " \
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"width = (int) 32, " \
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"depth = (int) 32, " \
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"signed = (boolean) { true, false } ;" \
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"audio/x-raw-int, " \
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"rate = (int) [ 1, MAX ], " \
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"channels = (int) [ 1, MAX ], " \
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"endianness = (int) BYTE_ORDER, " \
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"width = (int) 16, " \
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"depth = (int) 16, " \
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"signed = (boolean) { true, false } ;" \
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"audio/x-raw-int, " \
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"rate = (int) [ 1, MAX ], " \
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"channels = (int) [ 1, MAX ], " \
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"endianness = (int) BYTE_ORDER, " \
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"width = (int) 8, " \
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"depth = (int) 8, " \
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"signed = (boolean) { true, false } ;" \
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"audio/x-raw-float, " \
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"rate = (int) [ 1, MAX ], " \
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"channels = (int) [ 1, MAX ], " \
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"endianness = (int) BYTE_ORDER, " \
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"width = (int) { 32, 64 }"
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static GstStaticPadTemplate gst_adder_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (CAPS)
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);
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static GstStaticPadTemplate gst_adder_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink%d",
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GST_PAD_SINK,
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GST_PAD_REQUEST,
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GST_STATIC_CAPS (CAPS)
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);
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static void gst_adder_class_init (GstAdderClass * klass);
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static void gst_adder_init (GstAdder * adder);
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static void gst_adder_finalize (GObject * object);
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static gboolean gst_adder_setcaps (GstPad * pad, GstCaps * caps);
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static gboolean gst_adder_query (GstPad * pad, GstQuery * query);
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static gboolean gst_adder_src_event (GstPad * pad, GstEvent * event);
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static gboolean gst_adder_sink_event (GstPad * pad, GstEvent * event);
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static GstPad *gst_adder_request_new_pad (GstElement * element,
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GstPadTemplate * temp, const gchar * unused);
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static void gst_adder_release_pad (GstElement * element, GstPad * pad);
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static GstStateChangeReturn gst_adder_change_state (GstElement * element,
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GstStateChange transition);
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static GstFlowReturn gst_adder_collected (GstCollectPads * pads,
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gpointer user_data);
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static GstElementClass *parent_class = NULL;
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GType
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gst_adder_get_type (void)
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{
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static GType adder_type = 0;
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if (G_UNLIKELY (adder_type == 0)) {
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static const GTypeInfo adder_info = {
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sizeof (GstAdderClass), NULL, NULL,
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(GClassInitFunc) gst_adder_class_init, NULL, NULL,
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sizeof (GstAdder), 0,
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(GInstanceInitFunc) gst_adder_init,
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};
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adder_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAdder",
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&adder_info, 0);
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GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "adder", 0,
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"audio channel mixing element");
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}
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return adder_type;
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}
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/* clipping versions */
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#define MAKE_FUNC(name,type,ttype,min,max) \
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static void name (type *out, type *in, gint bytes) { \
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gint i; \
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for (i = 0; i < bytes / sizeof (type); i++) \
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out[i] = CLAMP ((ttype)out[i] + (ttype)in[i], min, max); \
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}
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/* non-clipping versions (for float) */
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#define MAKE_FUNC_NC(name,type,ttype) \
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static void name (type *out, type *in, gint bytes) { \
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gint i; \
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for (i = 0; i < bytes / sizeof (type); i++) \
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out[i] = (ttype)out[i] + (ttype)in[i]; \
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}
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/* *INDENT-OFF* */
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MAKE_FUNC (add_int32, gint32, gint64, MIN_INT_32, MAX_INT_32)
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MAKE_FUNC (add_int16, gint16, gint32, MIN_INT_16, MAX_INT_16)
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MAKE_FUNC (add_int8, gint8, gint16, MIN_INT_8, MAX_INT_8)
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MAKE_FUNC (add_uint32, guint32, guint64, MIN_UINT_32, MAX_UINT_32)
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MAKE_FUNC (add_uint16, guint16, guint32, MIN_UINT_16, MAX_UINT_16)
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MAKE_FUNC (add_uint8, guint8, guint16, MIN_UINT_8, MAX_UINT_8)
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MAKE_FUNC_NC (add_float64, gdouble, gdouble)
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MAKE_FUNC_NC (add_float32, gfloat, gfloat)
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/* *INDENT-ON* */
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/* we can only accept caps that we and downstream can handle. */
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static GstCaps *
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gst_adder_sink_getcaps (GstPad * pad)
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{
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GstAdder *adder;
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GstCaps *result, *peercaps, *sinkcaps;
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adder = GST_ADDER (GST_PAD_PARENT (pad));
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GST_OBJECT_LOCK (adder);
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/* get the downstream possible caps */
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peercaps = gst_pad_peer_get_caps (adder->srcpad);
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/* get the allowed caps on this sinkpad, we use the fixed caps function so
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* that it does not call recursively in this function. */
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sinkcaps = gst_pad_get_fixed_caps_func (pad);
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if (peercaps) {
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/* if the peer has caps, intersect */
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GST_DEBUG_OBJECT (adder, "intersecting peer and template caps");
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result = gst_caps_intersect (peercaps, sinkcaps);
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gst_caps_unref (peercaps);
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gst_caps_unref (sinkcaps);
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} else {
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/* the peer has no caps (or there is no peer), just use the allowed caps
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* of this sinkpad. */
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GST_DEBUG_OBJECT (adder, "no peer caps, using sinkcaps");
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result = sinkcaps;
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}
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GST_OBJECT_UNLOCK (adder);
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return result;
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}
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/* the first caps we receive on any of the sinkpads will define the caps for all
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* the other sinkpads because we can only mix streams with the same caps.
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* */
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static gboolean
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gst_adder_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstAdder *adder;
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GList *pads;
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GstStructure *structure;
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const char *media_type;
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adder = GST_ADDER (GST_PAD_PARENT (pad));
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GST_LOG_OBJECT (adder, "setting caps on pad %p,%s to %" GST_PTR_FORMAT, pad,
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GST_PAD_NAME (pad), caps);
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/* FIXME, see if the other pads can accept the format. Also lock the
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* format on the other pads to this new format. */
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GST_OBJECT_LOCK (adder);
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pads = GST_ELEMENT (adder)->pads;
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while (pads) {
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GstPad *otherpad = GST_PAD (pads->data);
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if (otherpad != pad) {
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gst_caps_replace (&GST_PAD_CAPS (otherpad), caps);
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}
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pads = g_list_next (pads);
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}
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GST_OBJECT_UNLOCK (adder);
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/* parse caps now */
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structure = gst_caps_get_structure (caps, 0);
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media_type = gst_structure_get_name (structure);
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if (strcmp (media_type, "audio/x-raw-int") == 0) {
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GST_DEBUG_OBJECT (adder, "parse_caps sets adder to format int");
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adder->format = GST_ADDER_FORMAT_INT;
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gst_structure_get_int (structure, "width", &adder->width);
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gst_structure_get_int (structure, "depth", &adder->depth);
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gst_structure_get_int (structure, "endianness", &adder->endianness);
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gst_structure_get_boolean (structure, "signed", &adder->is_signed);
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if (adder->endianness != G_BYTE_ORDER)
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goto not_supported;
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switch (adder->width) {
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case 8:
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adder->func = (adder->is_signed ?
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(GstAdderFunction) add_int8 : (GstAdderFunction) add_uint8);
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break;
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case 16:
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adder->func = (adder->is_signed ?
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(GstAdderFunction) add_int16 : (GstAdderFunction) add_uint16);
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break;
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case 32:
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adder->func = (adder->is_signed ?
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(GstAdderFunction) add_int32 : (GstAdderFunction) add_uint32);
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break;
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default:
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goto not_supported;
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}
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} else if (strcmp (media_type, "audio/x-raw-float") == 0) {
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GST_DEBUG_OBJECT (adder, "parse_caps sets adder to format float");
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adder->format = GST_ADDER_FORMAT_FLOAT;
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gst_structure_get_int (structure, "width", &adder->width);
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gst_structure_get_int (structure, "endianness", &adder->endianness);
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if (adder->endianness != G_BYTE_ORDER)
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goto not_supported;
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switch (adder->width) {
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case 32:
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adder->func = (GstAdderFunction) add_float32;
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break;
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case 64:
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adder->func = (GstAdderFunction) add_float64;
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break;
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default:
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goto not_supported;
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}
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} else {
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goto not_supported;
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}
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gst_structure_get_int (structure, "channels", &adder->channels);
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gst_structure_get_int (structure, "rate", &adder->rate);
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/* precalc bps */
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adder->bps = (adder->width / 8) * adder->channels;
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return TRUE;
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/* ERRORS */
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not_supported:
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{
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GST_DEBUG_OBJECT (adder, "unsupported format set as caps");
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return FALSE;
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}
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}
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/* FIXME, the duration query should reflect how long you will produce
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* data, that is the amount of stream time until you will emit EOS.
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*
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* For synchronized mixing this is always the max of all the durations
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* of upstream since we emit EOS when all of them finished.
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*
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* We don't do synchronized mixing so this really depends on where the
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* streams where punched in and what their relative offsets are against
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* eachother which we can get from the first timestamps we see.
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*
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* When we add a new stream (or remove a stream) the duration might
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* also become invalid again and we need to post a new DURATION
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* message to notify this fact to the parent.
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* For now we take the max of all the upstream elements so the simple
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* cases work at least somewhat.
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*/
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static gboolean
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gst_adder_query_duration (GstAdder * adder, GstQuery * query)
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{
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gint64 max;
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gboolean res;
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GstFormat format;
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GstIterator *it;
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gboolean done;
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/* parse format */
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gst_query_parse_duration (query, &format, NULL);
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max = -1;
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res = TRUE;
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done = FALSE;
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it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
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while (!done) {
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GstIteratorResult ires;
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gpointer item;
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ires = gst_iterator_next (it, &item);
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switch (ires) {
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case GST_ITERATOR_DONE:
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done = TRUE;
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break;
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case GST_ITERATOR_OK:
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{
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GstPad *pad = GST_PAD_CAST (item);
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gint64 duration;
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/* ask sink peer for duration */
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res &= gst_pad_query_peer_duration (pad, &format, &duration);
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/* take max from all valid return values */
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if (res) {
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/* valid unknown length, stop searching */
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if (duration == -1) {
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max = duration;
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done = TRUE;
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}
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/* else see if bigger than current max */
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else if (duration > max)
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max = duration;
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}
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gst_object_unref (pad);
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break;
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}
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case GST_ITERATOR_RESYNC:
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max = -1;
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res = TRUE;
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gst_iterator_resync (it);
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break;
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default:
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res = FALSE;
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done = TRUE;
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break;
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}
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}
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gst_iterator_free (it);
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if (res) {
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/* and store the max */
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GST_DEBUG_OBJECT (adder, "Total duration in format %s: %"
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GST_TIME_FORMAT, gst_format_get_name (format), GST_TIME_ARGS (max));
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gst_query_set_duration (query, format, max);
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}
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return res;
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}
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static gboolean
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gst_adder_query_latency (GstAdder * adder, GstQuery * query)
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{
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GstClockTime min, max;
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gboolean live;
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gboolean res;
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GstIterator *it;
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gboolean done;
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res = TRUE;
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done = FALSE;
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live = FALSE;
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min = 0;
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max = GST_CLOCK_TIME_NONE;
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/* Take maximum of all latency values */
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it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
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while (!done) {
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GstIteratorResult ires;
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gpointer item;
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ires = gst_iterator_next (it, &item);
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switch (ires) {
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case GST_ITERATOR_DONE:
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done = TRUE;
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break;
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case GST_ITERATOR_OK:
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{
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GstPad *pad = GST_PAD_CAST (item);
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GstQuery *peerquery;
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GstClockTime min_cur, max_cur;
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gboolean live_cur;
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peerquery = gst_query_new_latency ();
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/* Ask peer for latency */
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res &= gst_pad_peer_query (pad, peerquery);
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/* take max from all valid return values */
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if (res) {
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gst_query_parse_latency (peerquery, &live_cur, &min_cur, &max_cur);
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if (min_cur > min)
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min = min_cur;
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if (max_cur != GST_CLOCK_TIME_NONE &&
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((max != GST_CLOCK_TIME_NONE && max_cur > max) ||
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(max == GST_CLOCK_TIME_NONE)))
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max = max_cur;
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live = live || live_cur;
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}
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gst_query_unref (peerquery);
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gst_object_unref (pad);
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break;
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}
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case GST_ITERATOR_RESYNC:
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live = FALSE;
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min = 0;
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max = GST_CLOCK_TIME_NONE;
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res = TRUE;
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gst_iterator_resync (it);
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break;
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default:
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res = FALSE;
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done = TRUE;
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break;
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}
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}
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gst_iterator_free (it);
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if (res) {
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/* store the results */
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GST_DEBUG_OBJECT (adder, "Calculated total latency: live %s, min %"
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GST_TIME_FORMAT ", max %" GST_TIME_FORMAT,
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(live ? "yes" : "no"), GST_TIME_ARGS (min), GST_TIME_ARGS (max));
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gst_query_set_latency (query, live, min, max);
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}
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return res;
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}
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static gboolean
|
|
gst_adder_query (GstPad * pad, GstQuery * query)
|
|
{
|
|
GstAdder *adder = GST_ADDER (gst_pad_get_parent (pad));
|
|
gboolean res = FALSE;
|
|
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_POSITION:
|
|
{
|
|
GstFormat format;
|
|
|
|
gst_query_parse_position (query, &format, NULL);
|
|
|
|
switch (format) {
|
|
case GST_FORMAT_TIME:
|
|
/* FIXME, bring to stream time, might be tricky */
|
|
gst_query_set_position (query, format, adder->timestamp);
|
|
res = TRUE;
|
|
break;
|
|
case GST_FORMAT_DEFAULT:
|
|
gst_query_set_position (query, format, adder->offset);
|
|
res = TRUE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
case GST_QUERY_DURATION:
|
|
res = gst_adder_query_duration (adder, query);
|
|
break;
|
|
case GST_QUERY_LATENCY:
|
|
res = gst_adder_query_latency (adder, query);
|
|
break;
|
|
default:
|
|
/* FIXME, needs a custom query handler because we have multiple
|
|
* sinkpads */
|
|
res = gst_pad_query_default (pad, query);
|
|
break;
|
|
}
|
|
|
|
gst_object_unref (adder);
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
forward_event_func (GstPad * pad, GValue * ret, GstEvent * event)
|
|
{
|
|
gst_event_ref (event);
|
|
GST_LOG_OBJECT (pad, "About to send event %s", GST_EVENT_TYPE_NAME (event));
|
|
if (!gst_pad_push_event (pad, event)) {
|
|
g_value_set_boolean (ret, FALSE);
|
|
GST_WARNING_OBJECT (pad, "Sending event %p (%s) failed.",
|
|
event, GST_EVENT_TYPE_NAME (event));
|
|
} else {
|
|
GST_LOG_OBJECT (pad, "Sent event %p (%s).",
|
|
event, GST_EVENT_TYPE_NAME (event));
|
|
}
|
|
gst_object_unref (pad);
|
|
return TRUE;
|
|
}
|
|
|
|
/* forwards the event to all sinkpads, takes ownership of the
|
|
* event
|
|
*
|
|
* Returns: TRUE if the event could be forwarded on all
|
|
* sinkpads.
|
|
*/
|
|
static gboolean
|
|
forward_event (GstAdder * adder, GstEvent * event)
|
|
{
|
|
gboolean ret;
|
|
GstIterator *it;
|
|
GValue vret = { 0 };
|
|
|
|
GST_LOG_OBJECT (adder, "Forwarding event %p (%s)", event,
|
|
GST_EVENT_TYPE_NAME (event));
|
|
|
|
ret = TRUE;
|
|
|
|
g_value_init (&vret, G_TYPE_BOOLEAN);
|
|
g_value_set_boolean (&vret, TRUE);
|
|
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
|
|
gst_iterator_fold (it, (GstIteratorFoldFunction) forward_event_func, &vret,
|
|
event);
|
|
gst_iterator_free (it);
|
|
gst_event_unref (event);
|
|
|
|
ret = g_value_get_boolean (&vret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_adder_src_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
GstAdder *adder;
|
|
gboolean result;
|
|
|
|
adder = GST_ADDER (gst_pad_get_parent (pad));
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_QOS:
|
|
/* QoS might be tricky */
|
|
result = FALSE;
|
|
break;
|
|
case GST_EVENT_SEEK:
|
|
{
|
|
GstSeekFlags flags;
|
|
GstSeekType curtype;
|
|
gint64 cur;
|
|
|
|
/* parse the seek parameters */
|
|
gst_event_parse_seek (event, &adder->segment_rate, NULL, &flags, &curtype,
|
|
&cur, NULL, NULL);
|
|
|
|
/* check if we are flushing */
|
|
if (flags & GST_SEEK_FLAG_FLUSH) {
|
|
/* make sure we accept nothing anymore and return WRONG_STATE */
|
|
gst_collect_pads_set_flushing (adder->collect, TRUE);
|
|
|
|
/* flushing seek, start flush downstream, the flush will be done
|
|
* when all pads received a FLUSH_STOP. */
|
|
gst_pad_push_event (adder->srcpad, gst_event_new_flush_start ());
|
|
}
|
|
/* now wait for the collected to be finished and mark a new
|
|
* segment */
|
|
GST_OBJECT_LOCK (adder->collect);
|
|
if (curtype == GST_SEEK_TYPE_SET)
|
|
adder->segment_position = cur;
|
|
else
|
|
adder->segment_position = 0;
|
|
adder->segment_pending = TRUE;
|
|
GST_OBJECT_UNLOCK (adder->collect);
|
|
|
|
result = forward_event (adder, event);
|
|
break;
|
|
}
|
|
case GST_EVENT_NAVIGATION:
|
|
/* navigation is rather pointless. */
|
|
result = FALSE;
|
|
break;
|
|
default:
|
|
/* just forward the rest for now */
|
|
result = forward_event (adder, event);
|
|
break;
|
|
}
|
|
gst_object_unref (adder);
|
|
|
|
return result;
|
|
}
|
|
|
|
static gboolean
|
|
gst_adder_sink_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
GstAdder *adder;
|
|
gboolean ret;
|
|
|
|
adder = GST_ADDER (gst_pad_get_parent (pad));
|
|
|
|
GST_DEBUG ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_FLUSH_STOP:
|
|
/* mark a pending new segment. This event is synchronized
|
|
* with the streaming thread so we can safely update the
|
|
* variable without races. It's somewhat weird because we
|
|
* assume the collectpads forwarded the FLUSH_STOP past us
|
|
* and downstream (using our source pad, the bastard!).
|
|
*/
|
|
adder->segment_pending = TRUE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* now GstCollectPads can take care of the rest, e.g. EOS */
|
|
ret = adder->collect_event (pad, event);
|
|
|
|
gst_object_unref (adder);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gst_adder_class_init (GstAdderClass * klass)
|
|
{
|
|
GObjectClass *gobject_class = (GObjectClass *) klass;
|
|
GstElementClass *gstelement_class = (GstElementClass *) klass;
|
|
|
|
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_adder_finalize);
|
|
|
|
gst_element_class_add_pad_template (gstelement_class,
|
|
gst_static_pad_template_get (&gst_adder_src_template));
|
|
gst_element_class_add_pad_template (gstelement_class,
|
|
gst_static_pad_template_get (&gst_adder_sink_template));
|
|
gst_element_class_set_details_simple (gstelement_class, "Adder",
|
|
"Generic/Audio",
|
|
"Add N audio channels together",
|
|
"Thomas Vander Stichele <thomas at apestaart dot org>");
|
|
|
|
parent_class = g_type_class_peek_parent (klass);
|
|
|
|
gstelement_class->request_new_pad =
|
|
GST_DEBUG_FUNCPTR (gst_adder_request_new_pad);
|
|
gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_adder_release_pad);
|
|
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_adder_change_state);
|
|
}
|
|
|
|
static void
|
|
gst_adder_init (GstAdder * adder)
|
|
{
|
|
GstPadTemplate *template;
|
|
|
|
template = gst_static_pad_template_get (&gst_adder_src_template);
|
|
adder->srcpad = gst_pad_new_from_template (template, "src");
|
|
gst_object_unref (template);
|
|
|
|
gst_pad_set_getcaps_function (adder->srcpad,
|
|
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
|
|
gst_pad_set_setcaps_function (adder->srcpad,
|
|
GST_DEBUG_FUNCPTR (gst_adder_setcaps));
|
|
gst_pad_set_query_function (adder->srcpad,
|
|
GST_DEBUG_FUNCPTR (gst_adder_query));
|
|
gst_pad_set_event_function (adder->srcpad,
|
|
GST_DEBUG_FUNCPTR (gst_adder_src_event));
|
|
gst_element_add_pad (GST_ELEMENT (adder), adder->srcpad);
|
|
|
|
adder->format = GST_ADDER_FORMAT_UNSET;
|
|
adder->padcount = 0;
|
|
adder->func = NULL;
|
|
|
|
/* keep track of the sinkpads requested */
|
|
adder->collect = gst_collect_pads_new ();
|
|
gst_collect_pads_set_function (adder->collect,
|
|
GST_DEBUG_FUNCPTR (gst_adder_collected), adder);
|
|
}
|
|
|
|
static void
|
|
gst_adder_finalize (GObject * object)
|
|
{
|
|
GstAdder *adder = GST_ADDER (object);
|
|
|
|
gst_object_unref (adder->collect);
|
|
adder->collect = NULL;
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
static GstPad *
|
|
gst_adder_request_new_pad (GstElement * element, GstPadTemplate * templ,
|
|
const gchar * unused)
|
|
{
|
|
gchar *name;
|
|
GstAdder *adder;
|
|
GstPad *newpad;
|
|
gint padcount;
|
|
|
|
if (templ->direction != GST_PAD_SINK)
|
|
goto not_sink;
|
|
|
|
adder = GST_ADDER (element);
|
|
|
|
/* increment pad counter */
|
|
padcount = g_atomic_int_exchange_and_add (&adder->padcount, 1);
|
|
|
|
name = g_strdup_printf ("sink%d", padcount);
|
|
newpad = gst_pad_new_from_template (templ, name);
|
|
GST_DEBUG_OBJECT (adder, "request new pad %s", name);
|
|
g_free (name);
|
|
|
|
gst_pad_set_getcaps_function (newpad,
|
|
GST_DEBUG_FUNCPTR (gst_adder_sink_getcaps));
|
|
gst_pad_set_setcaps_function (newpad, GST_DEBUG_FUNCPTR (gst_adder_setcaps));
|
|
gst_collect_pads_add_pad (adder->collect, newpad, sizeof (GstCollectData));
|
|
|
|
/* FIXME: hacked way to override/extend the event function of
|
|
* GstCollectPads; because it sets its own event function giving the
|
|
* element no access to events */
|
|
adder->collect_event = (GstPadEventFunction) GST_PAD_EVENTFUNC (newpad);
|
|
gst_pad_set_event_function (newpad, GST_DEBUG_FUNCPTR (gst_adder_sink_event));
|
|
|
|
/* takes ownership of the pad */
|
|
if (!gst_element_add_pad (GST_ELEMENT (adder), newpad))
|
|
goto could_not_add;
|
|
|
|
return newpad;
|
|
|
|
/* errors */
|
|
not_sink:
|
|
{
|
|
g_warning ("gstadder: request new pad that is not a SINK pad\n");
|
|
return NULL;
|
|
}
|
|
could_not_add:
|
|
{
|
|
GST_DEBUG_OBJECT (adder, "could not add pad");
|
|
gst_collect_pads_remove_pad (adder->collect, newpad);
|
|
gst_object_unref (newpad);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_adder_release_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
GstAdder *adder;
|
|
|
|
adder = GST_ADDER (element);
|
|
|
|
GST_DEBUG_OBJECT (adder, "release pad %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
|
|
gst_collect_pads_remove_pad (adder->collect, pad);
|
|
gst_element_remove_pad (element, pad);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_adder_collected (GstCollectPads * pads, gpointer user_data)
|
|
{
|
|
/*
|
|
* combine channels by adding sample values
|
|
* basic algorithm :
|
|
* - this function is called when all pads have a buffer
|
|
* - get available bytes on all pads.
|
|
* - repeat for each input pad :
|
|
* - read available bytes, copy or add to target buffer
|
|
* - if there's an EOS event, remove the input channel
|
|
* - push out the output buffer
|
|
*/
|
|
GstAdder *adder;
|
|
guint size;
|
|
GSList *collected;
|
|
GstBuffer *outbuf;
|
|
GstFlowReturn ret;
|
|
gpointer outbytes;
|
|
gboolean empty = TRUE;
|
|
|
|
adder = GST_ADDER (user_data);
|
|
|
|
/* this is fatal */
|
|
if (G_UNLIKELY (adder->func == NULL))
|
|
goto not_negotiated;
|
|
|
|
/* get available bytes for reading, this can be 0 which could mean
|
|
* empty buffers or EOS, which we will catch when we loop over the
|
|
* pads. */
|
|
size = gst_collect_pads_available (pads);
|
|
|
|
GST_LOG_OBJECT (adder,
|
|
"starting to cycle through channels, %d bytes available (bps = %d)", size,
|
|
adder->bps);
|
|
|
|
outbuf = NULL;
|
|
outbytes = NULL;
|
|
|
|
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
|
|
GstCollectData *data;
|
|
guint8 *bytes;
|
|
guint len;
|
|
GstBuffer *inbuf;
|
|
|
|
data = (GstCollectData *) collected->data;
|
|
|
|
/* get a subbuffer of size bytes */
|
|
inbuf = gst_collect_pads_take_buffer (pads, data, size);
|
|
/* NULL means EOS or an empty buffer so we still need to flush in
|
|
* case of an empty buffer. */
|
|
if (inbuf == NULL) {
|
|
GST_LOG_OBJECT (adder, "channel %p: no bytes available", data);
|
|
goto next;
|
|
}
|
|
|
|
bytes = GST_BUFFER_DATA (inbuf);
|
|
len = GST_BUFFER_SIZE (inbuf);
|
|
|
|
if (outbuf == NULL) {
|
|
GST_LOG_OBJECT (adder, "channel %p: making output buffer of %d bytes",
|
|
data, size);
|
|
|
|
/* first buffer, alloc size bytes. FIXME, we can easily subbuffer
|
|
* and _make_writable. */
|
|
outbuf = gst_buffer_new_and_alloc (size);
|
|
outbytes = GST_BUFFER_DATA (outbuf);
|
|
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (adder->srcpad));
|
|
|
|
if (!GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP)) {
|
|
/* clear if we are only going to fill a partial buffer */
|
|
if (G_UNLIKELY (size > len))
|
|
memset (outbytes, 0, size);
|
|
|
|
GST_LOG_OBJECT (adder, "channel %p: copying %d bytes from data %p",
|
|
data, len, bytes);
|
|
|
|
/* and copy the data into it */
|
|
memcpy (outbytes, bytes, len);
|
|
empty = FALSE;
|
|
} else {
|
|
GST_LOG_OBJECT (adder, "channel %p: zeroing %d bytes from data %p",
|
|
data, len, bytes);
|
|
memset (outbytes, 0, size);
|
|
}
|
|
} else {
|
|
if (!GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP)) {
|
|
GST_LOG_OBJECT (adder, "channel %p: mixing %d bytes from data %p",
|
|
data, len, bytes);
|
|
/* other buffers, need to add them */
|
|
adder->func ((gpointer) outbytes, (gpointer) bytes, len);
|
|
empty = FALSE;
|
|
} else {
|
|
GST_LOG_OBJECT (adder, "channel %p: skipping %d bytes from data %p",
|
|
data, len, bytes);
|
|
}
|
|
}
|
|
next:
|
|
if (inbuf)
|
|
gst_buffer_unref (inbuf);
|
|
}
|
|
|
|
/* can only happen when no pads to collect or all EOS */
|
|
if (outbuf == NULL)
|
|
goto eos;
|
|
|
|
/* our timestamping is very simple, just an ever incrementing
|
|
* counter, the new segment time will take care of their respective
|
|
* stream time. */
|
|
if (adder->segment_pending) {
|
|
GstEvent *event;
|
|
|
|
/* FIXME, use rate/applied_rate as set on all sinkpads.
|
|
* - currently we just set rate as received from last seek-event
|
|
* We could potentially figure out the duration as well using
|
|
* the current segment positions and the stated stop positions.
|
|
* Also we just start from stream time 0 which is rather
|
|
* weird. For non-synchronized mixing, the time should be
|
|
* the min of the stream times of all received segments,
|
|
* rationale being that the duration is at least going to
|
|
* be as long as the earliest stream we start mixing. This
|
|
* would also be correct for synchronized mixing but then
|
|
* the later streams would be delayed until the stream times
|
|
* match.
|
|
*/
|
|
event = gst_event_new_new_segment_full (FALSE, adder->segment_rate,
|
|
1.0, GST_FORMAT_TIME, adder->timestamp, -1, adder->segment_position);
|
|
|
|
gst_pad_push_event (adder->srcpad, event);
|
|
adder->segment_pending = FALSE;
|
|
adder->segment_position = 0;
|
|
}
|
|
|
|
/* set timestamps on the output buffer */
|
|
GST_BUFFER_TIMESTAMP (outbuf) = adder->timestamp;
|
|
GST_BUFFER_OFFSET (outbuf) = adder->offset;
|
|
|
|
/* for the next timestamp, use the sample counter, which will
|
|
* never accumulate rounding errors */
|
|
adder->offset += size / adder->bps;
|
|
adder->timestamp = gst_util_uint64_scale_int (adder->offset,
|
|
GST_SECOND, adder->rate);
|
|
|
|
/* now we can set the duration of the buffer */
|
|
GST_BUFFER_DURATION (outbuf) = adder->timestamp -
|
|
GST_BUFFER_TIMESTAMP (outbuf);
|
|
|
|
/* if we only processed silence, mark output again as silence */
|
|
if (empty)
|
|
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);
|
|
|
|
/* send it out */
|
|
GST_LOG_OBJECT (adder, "pushing outbuf, timestamp %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
|
|
ret = gst_pad_push (adder->srcpad, outbuf);
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
not_negotiated:
|
|
{
|
|
GST_ELEMENT_ERROR (adder, STREAM, FORMAT, (NULL),
|
|
("Unknown data received, not negotiated"));
|
|
return GST_FLOW_NOT_NEGOTIATED;
|
|
}
|
|
eos:
|
|
{
|
|
GST_DEBUG_OBJECT (adder, "no data available, must be EOS");
|
|
gst_pad_push_event (adder->srcpad, gst_event_new_eos ());
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_adder_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstAdder *adder;
|
|
GstStateChangeReturn ret;
|
|
|
|
adder = GST_ADDER (element);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
adder->timestamp = 0;
|
|
adder->offset = 0;
|
|
adder->segment_pending = TRUE;
|
|
adder->segment_position = 0;
|
|
adder->segment_rate = 1.0;
|
|
gst_segment_init (&adder->segment, GST_FORMAT_UNDEFINED);
|
|
gst_collect_pads_start (adder->collect);
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
/* need to unblock the collectpads before calling the
|
|
* parent change_state so that streaming can finish */
|
|
gst_collect_pads_stop (adder->collect);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
plugin_init (GstPlugin * plugin)
|
|
{
|
|
if (!gst_element_register (plugin, "adder", GST_RANK_NONE, GST_TYPE_ADDER)) {
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
"adder",
|
|
"Adds multiple streams",
|
|
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
|