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307 lines
8.6 KiB
C
307 lines
8.6 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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-mulawdec
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*
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* This element decodes mulaw audio. Mulaw coding is also known as G.711.
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*/
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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 <gst/gst.h>
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#include "mulaw-decode.h"
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#include "mulaw-conversion.h"
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extern GstStaticPadTemplate mulaw_dec_src_factory;
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extern GstStaticPadTemplate mulaw_dec_sink_factory;
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/* Stereo signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0
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};
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static void gst_mulawdec_class_init (GstMuLawDecClass * klass);
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static void gst_mulawdec_base_init (GstMuLawDecClass * klass);
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static void gst_mulawdec_init (GstMuLawDec * mulawdec);
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static GstStateChangeReturn
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gst_mulawdec_change_state (GstElement * element, GstStateChange transition);
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static GstFlowReturn gst_mulawdec_chain (GstPad * pad, GstBuffer * buffer);
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static GstElementClass *parent_class = NULL;
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static gboolean
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mulawdec_sink_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstMuLawDec *mulawdec;
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GstStructure *structure;
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int rate, channels;
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gboolean ret;
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GstCaps *outcaps;
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mulawdec = GST_MULAWDEC (GST_PAD_PARENT (pad));
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structure = gst_caps_get_structure (caps, 0);
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ret = gst_structure_get_int (structure, "rate", &rate);
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ret = ret && gst_structure_get_int (structure, "channels", &channels);
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if (!ret)
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return FALSE;
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outcaps = gst_caps_new_simple ("audio/x-raw-int",
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"width", G_TYPE_INT, 16,
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"depth", G_TYPE_INT, 16,
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"endianness", G_TYPE_INT, G_BYTE_ORDER,
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"signed", G_TYPE_BOOLEAN, TRUE,
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"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, channels, NULL);
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ret = gst_pad_set_caps (mulawdec->srcpad, outcaps);
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gst_caps_unref (outcaps);
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if (ret) {
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GST_DEBUG_OBJECT (mulawdec, "rate=%d, channels=%d", rate, channels);
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mulawdec->rate = rate;
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mulawdec->channels = channels;
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}
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return ret;
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}
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static GstCaps *
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mulawdec_getcaps (GstPad * pad)
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{
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GstMuLawDec *mulawdec;
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GstPad *otherpad;
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GstCaps *othercaps, *result;
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const GstCaps *templ;
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const gchar *name;
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gint i;
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mulawdec = GST_MULAWDEC (GST_PAD_PARENT (pad));
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/* figure out the name of the caps we are going to return */
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if (pad == mulawdec->srcpad) {
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name = "audio/x-raw-int";
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otherpad = mulawdec->sinkpad;
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} else {
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name = "audio/x-mulaw";
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otherpad = mulawdec->srcpad;
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}
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/* get caps from the peer, this can return NULL when there is no peer */
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othercaps = gst_pad_peer_get_caps (otherpad);
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/* get the template caps to make sure we return something acceptable */
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templ = gst_pad_get_pad_template_caps (pad);
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if (othercaps) {
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/* there was a peer */
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othercaps = gst_caps_make_writable (othercaps);
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/* go through the caps and remove the fields we don't want */
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for (i = 0; i < gst_caps_get_size (othercaps); i++) {
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GstStructure *structure;
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structure = gst_caps_get_structure (othercaps, i);
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/* adjust the name */
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gst_structure_set_name (structure, name);
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if (pad == mulawdec->sinkpad) {
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/* remove the fields we don't want */
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gst_structure_remove_fields (structure, "width", "depth", "endianness",
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"signed", NULL);
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} else {
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/* add fixed fields */
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gst_structure_set (structure, "width", G_TYPE_INT, 16,
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"depth", G_TYPE_INT, 16,
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"endianness", G_TYPE_INT, G_BYTE_ORDER,
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"signed", G_TYPE_BOOLEAN, TRUE, NULL);
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}
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}
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/* filter against the allowed caps of the pad to return our result */
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result = gst_caps_intersect (othercaps, templ);
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gst_caps_unref (othercaps);
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} else {
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/* there was no peer, return the template caps */
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result = gst_caps_copy (templ);
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}
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return result;
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}
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GType
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gst_mulawdec_get_type (void)
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{
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static GType mulawdec_type = 0;
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if (!mulawdec_type) {
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static const GTypeInfo mulawdec_info = {
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sizeof (GstMuLawDecClass),
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(GBaseInitFunc) gst_mulawdec_base_init,
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NULL,
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(GClassInitFunc) gst_mulawdec_class_init,
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NULL,
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NULL,
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sizeof (GstMuLawDec),
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0,
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(GInstanceInitFunc) gst_mulawdec_init,
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};
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mulawdec_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstMuLawDec", &mulawdec_info,
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0);
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}
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return mulawdec_type;
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}
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static void
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gst_mulawdec_base_init (GstMuLawDecClass * klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&mulaw_dec_src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&mulaw_dec_sink_factory));
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gst_element_class_set_details_simple (element_class, "Mu Law audio decoder",
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"Codec/Decoder/Audio",
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"Convert 8bit mu law to 16bit PCM",
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"Zaheer Abbas Merali <zaheerabbas at merali dot org>");
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}
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static void
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gst_mulawdec_class_init (GstMuLawDecClass * klass)
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{
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GstElementClass *element_class = (GstElementClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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element_class->change_state = GST_DEBUG_FUNCPTR (gst_mulawdec_change_state);
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}
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static void
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gst_mulawdec_init (GstMuLawDec * mulawdec)
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{
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mulawdec->sinkpad =
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gst_pad_new_from_static_template (&mulaw_dec_sink_factory, "sink");
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gst_pad_set_setcaps_function (mulawdec->sinkpad, mulawdec_sink_setcaps);
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gst_pad_set_getcaps_function (mulawdec->sinkpad, mulawdec_getcaps);
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gst_pad_set_chain_function (mulawdec->sinkpad, gst_mulawdec_chain);
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gst_element_add_pad (GST_ELEMENT (mulawdec), mulawdec->sinkpad);
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mulawdec->srcpad =
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gst_pad_new_from_static_template (&mulaw_dec_src_factory, "src");
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gst_pad_use_fixed_caps (mulawdec->srcpad);
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gst_pad_set_getcaps_function (mulawdec->srcpad, mulawdec_getcaps);
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gst_element_add_pad (GST_ELEMENT (mulawdec), mulawdec->srcpad);
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}
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static GstFlowReturn
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gst_mulawdec_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstMuLawDec *mulawdec;
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gint16 *linear_data;
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guint8 *mulaw_data;
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guint mulaw_size;
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GstBuffer *outbuf;
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GstFlowReturn ret;
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mulawdec = GST_MULAWDEC (GST_PAD_PARENT (pad));
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if (G_UNLIKELY (mulawdec->rate == 0))
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goto not_negotiated;
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mulaw_data = (guint8 *) GST_BUFFER_DATA (buffer);
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mulaw_size = GST_BUFFER_SIZE (buffer);
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ret =
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gst_pad_alloc_buffer_and_set_caps (mulawdec->srcpad,
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GST_BUFFER_OFFSET_NONE, mulaw_size * 2, GST_PAD_CAPS (mulawdec->srcpad),
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&outbuf);
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if (ret != GST_FLOW_OK)
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goto alloc_failed;
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linear_data = (gint16 *) GST_BUFFER_DATA (outbuf);
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/* copy discont flag */
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
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GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
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GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
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if (GST_BUFFER_DURATION (outbuf) == GST_CLOCK_TIME_NONE)
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GST_BUFFER_DURATION (outbuf) = gst_util_uint64_scale_int (GST_SECOND,
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mulaw_size * 2, 2 * mulawdec->rate * mulawdec->channels);
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else
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GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buffer);
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gst_buffer_set_caps (outbuf, GST_PAD_CAPS (mulawdec->srcpad));
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mulaw_decode (mulaw_data, linear_data, mulaw_size);
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gst_buffer_unref (buffer);
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ret = gst_pad_push (mulawdec->srcpad, outbuf);
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return ret;
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/* ERRORS */
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not_negotiated:
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{
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GST_WARNING_OBJECT (mulawdec, "no input format set: not-negotiated");
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gst_buffer_unref (buffer);
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return GST_FLOW_NOT_NEGOTIATED;
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}
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alloc_failed:
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{
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GST_DEBUG_OBJECT (mulawdec, "pad alloc failed, flow: %s",
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gst_flow_get_name (ret));
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gst_buffer_unref (buffer);
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return ret;
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}
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}
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static GstStateChangeReturn
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gst_mulawdec_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstMuLawDec *dec = GST_MULAWDEC (element);
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switch (transition) {
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret != GST_STATE_CHANGE_SUCCESS)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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dec->rate = 0;
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dec->channels = 0;
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break;
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default:
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break;
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}
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return ret;
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}
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