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Original commit message from CVS: * gst/law/alaw-decode.c: (alawdec_sink_setcaps), (gst_alawdec_class_init), (gst_alawdec_init), (gst_alawdec_chain), (gst_alawdec_change_state): * gst/law/alaw-decode.h: * gst/law/mulaw-decode.c: (mulawdec_sink_setcaps), (gst_mulawdec_class_init), (gst_mulawdec_init), (gst_mulawdec_chain), (gst_mulawdec_change_state): * gst/law/mulaw-decode.h: Fix capsnego bogosity in *law decoders.
233 lines
6.1 KiB
C
233 lines
6.1 KiB
C
/* GStreamer
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* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
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* PCM - A-Law conversion
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* Copyright (C) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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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 2.1 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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#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 "alaw-decode.h"
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extern GstPadTemplate *alawdec_src_template, *alawdec_sink_template;
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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_alawdec_class_init (GstALawDecClass * klass);
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static void gst_alawdec_base_init (GstALawDecClass * klass);
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static void gst_alawdec_init (GstALawDec * alawdec);
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static GstStateChangeReturn
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gst_alawdec_change_state (GstElement * element, GstStateChange transition);
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static GstFlowReturn gst_alawdec_chain (GstPad * pad, GstBuffer * buffer);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
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/*
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* alaw_to_s16() - Convert an A-law value to 16-bit linear PCM
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*
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*/
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static gint
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alaw_to_s16 (guint8 a_val)
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{
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gint t;
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gint seg;
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a_val ^= 0x55;
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t = a_val & 0x7f;
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if (t < 16)
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t = (t << 4) + 8;
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else {
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seg = (t >> 4) & 0x07;
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t = ((t & 0x0f) << 4) + 0x108;
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t <<= seg - 1;
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}
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return ((a_val & 0x80) ? t : -t);
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}
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static gboolean
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alawdec_sink_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstALawDec *alawdec;
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GstStructure *structure;
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int rate, channels;
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gboolean ret;
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alawdec = GST_ALAWDEC (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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if (alawdec->srccaps)
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gst_caps_unref (alawdec->srccaps);
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alawdec->srccaps = 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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return TRUE;
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}
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GType
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gst_alawdec_get_type (void)
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{
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static GType alawdec_type = 0;
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if (!alawdec_type) {
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static const GTypeInfo alawdec_info = {
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sizeof (GstALawDecClass),
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(GBaseInitFunc) gst_alawdec_base_init,
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NULL,
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(GClassInitFunc) gst_alawdec_class_init,
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NULL,
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NULL,
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sizeof (GstALawDec),
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0,
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(GInstanceInitFunc) gst_alawdec_init,
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};
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alawdec_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstALawDec", &alawdec_info,
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0);
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}
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return alawdec_type;
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}
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static void
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gst_alawdec_base_init (GstALawDecClass * klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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const GstElementDetails alawdec_details =
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GST_ELEMENT_DETAILS ("A Law audio decoder",
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"Codec/Decoder/Audio",
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"Convert 8bit A law to 16bit PCM",
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"Zaheer Abbas Merali <zaheerabbas at merali dot org>");
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gst_element_class_add_pad_template (element_class, alawdec_src_template);
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gst_element_class_add_pad_template (element_class, alawdec_sink_template);
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gst_element_class_set_details (element_class, &alawdec_details);
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}
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static void
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gst_alawdec_class_init (GstALawDecClass * 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_alawdec_change_state);
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}
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static void
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gst_alawdec_init (GstALawDec * alawdec)
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{
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alawdec->sinkpad = gst_pad_new_from_template (alawdec_sink_template, "sink");
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gst_pad_set_setcaps_function (alawdec->sinkpad, alawdec_sink_setcaps);
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gst_pad_set_chain_function (alawdec->sinkpad, gst_alawdec_chain);
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gst_element_add_pad (GST_ELEMENT (alawdec), alawdec->sinkpad);
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alawdec->srcpad = gst_pad_new_from_template (alawdec_src_template, "src");
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gst_pad_use_fixed_caps (alawdec->srcpad);
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gst_element_add_pad (GST_ELEMENT (alawdec), alawdec->srcpad);
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}
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static GstFlowReturn
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gst_alawdec_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstALawDec *alawdec;
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gint16 *linear_data;
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guint8 *alaw_data;
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guint alaw_size;
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GstBuffer *outbuf;
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gint i;
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GstFlowReturn ret;
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alawdec = GST_ALAWDEC (gst_pad_get_parent (pad));
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alaw_data = GST_BUFFER_DATA (buffer);
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alaw_size = GST_BUFFER_SIZE (buffer);
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outbuf = gst_buffer_new_and_alloc (alaw_size * 2);
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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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GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buffer);
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gst_buffer_set_caps (outbuf, alawdec->srccaps);
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for (i = 0; i < alaw_size; i++) {
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linear_data[i] = alaw_to_s16 (alaw_data[i]);
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}
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gst_buffer_unref (buffer);
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ret = gst_pad_push (alawdec->srcpad, outbuf);
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gst_object_unref (alawdec);
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return ret;
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}
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static GstStateChangeReturn
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gst_alawdec_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstALawDec *dec = GST_ALAWDEC (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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if (dec->srccaps) {
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gst_caps_unref (dec->srccaps);
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dec->srccaps = NULL;
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}
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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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