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289 lines
7.8 KiB
C
289 lines
7.8 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-mulawenc
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*
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* This element encode 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-encode.h"
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#include "mulaw-conversion.h"
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extern GstStaticPadTemplate mulaw_enc_src_factory;
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extern GstStaticPadTemplate mulaw_enc_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_mulawenc_class_init (GstMuLawEncClass * klass);
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static void gst_mulawenc_base_init (GstMuLawEncClass * klass);
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static void gst_mulawenc_init (GstMuLawEnc * mulawenc);
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static GstFlowReturn gst_mulawenc_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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static GstCaps *
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mulawenc_getcaps (GstPad * pad)
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{
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GstMuLawEnc *mulawenc;
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GstPad *otherpad;
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GstCaps *base_caps, *othercaps;
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mulawenc = GST_MULAWENC (GST_PAD_PARENT (pad));
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base_caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
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if (pad == mulawenc->srcpad) {
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otherpad = mulawenc->sinkpad;
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} else {
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otherpad = mulawenc->srcpad;
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}
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othercaps = gst_pad_peer_get_caps (otherpad);
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if (othercaps) {
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GstStructure *structure;
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const GValue *orate, *ochans;
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const GValue *rate, *chans;
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GValue irate = { 0 };
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GValue ichans = { 0 };
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if (gst_caps_is_empty (othercaps) || gst_caps_is_any (othercaps))
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goto done;
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structure = gst_caps_get_structure (othercaps, 0);
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orate = gst_structure_get_value (structure, "rate");
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ochans = gst_structure_get_value (structure, "channels");
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structure = gst_caps_get_structure (base_caps, 0);
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rate = gst_structure_get_value (structure, "rate");
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chans = gst_structure_get_value (structure, "channels");
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if (orate) {
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gst_value_intersect (&irate, orate, rate);
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gst_structure_set_value (structure, "rate", &irate);
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}
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if (ochans) {
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gst_value_intersect (&ichans, ochans, chans);
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gst_structure_set_value (structure, "channels", &ichans);
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}
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done:
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gst_caps_unref (othercaps);
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}
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return base_caps;
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}
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static gboolean
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mulawenc_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstMuLawEnc *mulawenc;
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GstPad *otherpad;
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GstStructure *structure;
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GstCaps *base_caps;
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mulawenc = GST_MULAWENC (gst_pad_get_parent (pad));
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (structure, "channels", &mulawenc->channels);
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gst_structure_get_int (structure, "rate", &mulawenc->rate);
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if (pad == mulawenc->sinkpad) {
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otherpad = mulawenc->srcpad;
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} else {
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otherpad = mulawenc->sinkpad;
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}
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base_caps = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad));
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structure = gst_caps_get_structure (base_caps, 0);
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gst_structure_set (structure, "rate", G_TYPE_INT, mulawenc->rate, NULL);
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gst_structure_set (structure, "channels", G_TYPE_INT, mulawenc->channels,
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NULL);
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gst_pad_set_caps (otherpad, base_caps);
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gst_object_unref (mulawenc);
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gst_caps_unref (base_caps);
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return TRUE;
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}
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GType
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gst_mulawenc_get_type (void)
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{
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static GType mulawenc_type = 0;
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if (!mulawenc_type) {
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static const GTypeInfo mulawenc_info = {
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sizeof (GstMuLawEncClass),
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(GBaseInitFunc) gst_mulawenc_base_init,
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NULL,
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(GClassInitFunc) gst_mulawenc_class_init,
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NULL,
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NULL,
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sizeof (GstMuLawEnc),
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0,
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(GInstanceInitFunc) gst_mulawenc_init,
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};
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mulawenc_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstMuLawEnc", &mulawenc_info,
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0);
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}
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return mulawenc_type;
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}
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static void
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gst_mulawenc_base_init (GstMuLawEncClass * klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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const GstElementDetails mulawenc_details =
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GST_ELEMENT_DETAILS ("Mu Law audio encoder",
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"Codec/Encoder/Audio",
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"Convert 16bit PCM to 8bit mu law",
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"Zaheer Abbas Merali <zaheerabbas at merali dot org>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&mulaw_enc_src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&mulaw_enc_sink_factory));
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gst_element_class_set_details (element_class, &mulawenc_details);
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}
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static void
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gst_mulawenc_class_init (GstMuLawEncClass * klass)
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{
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parent_class = g_type_class_peek_parent (klass);
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}
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static void
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gst_mulawenc_init (GstMuLawEnc * mulawenc)
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{
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mulawenc->sinkpad =
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gst_pad_new_from_static_template (&mulaw_enc_sink_factory, "sink");
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gst_pad_set_setcaps_function (mulawenc->sinkpad, mulawenc_setcaps);
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gst_pad_set_getcaps_function (mulawenc->sinkpad, mulawenc_getcaps);
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gst_pad_set_chain_function (mulawenc->sinkpad, gst_mulawenc_chain);
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gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->sinkpad);
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mulawenc->srcpad =
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gst_pad_new_from_static_template (&mulaw_enc_src_factory, "src");
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gst_pad_set_setcaps_function (mulawenc->srcpad, mulawenc_setcaps);
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gst_pad_set_getcaps_function (mulawenc->srcpad, mulawenc_getcaps);
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gst_pad_use_fixed_caps (mulawenc->srcpad);
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gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->srcpad);
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/* init rest */
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mulawenc->channels = 0;
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mulawenc->rate = 0;
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}
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static GstFlowReturn
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gst_mulawenc_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstMuLawEnc *mulawenc;
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gint16 *linear_data;
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guint linear_size;
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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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GstClockTime timestamp, duration;
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mulawenc = GST_MULAWENC (gst_pad_get_parent (pad));
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if (!mulawenc->rate || !mulawenc->channels)
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goto not_negotiated;
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linear_data = (gint16 *) GST_BUFFER_DATA (buffer);
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linear_size = GST_BUFFER_SIZE (buffer);
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mulaw_size = linear_size / 2;
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timestamp = GST_BUFFER_TIMESTAMP (buffer);
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duration = GST_BUFFER_DURATION (buffer);
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ret = gst_pad_alloc_buffer_and_set_caps (mulawenc->srcpad,
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GST_BUFFER_OFFSET_NONE, mulaw_size, GST_PAD_CAPS (mulawenc->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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if (duration == -1) {
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duration = gst_util_uint64_scale_int (mulaw_size,
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GST_SECOND, mulawenc->rate * mulawenc->channels);
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}
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if (GST_BUFFER_SIZE (outbuf) < mulaw_size) {
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/* pad-alloc can suggest a smaller size */
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gst_buffer_unref (outbuf);
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outbuf = gst_buffer_new_and_alloc (mulaw_size);
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}
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mulaw_data = (guint8 *) 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) = timestamp;
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GST_BUFFER_DURATION (outbuf) = duration;
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gst_buffer_set_caps (outbuf, GST_PAD_CAPS (mulawenc->srcpad));
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mulaw_encode (linear_data, mulaw_data, mulaw_size);
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gst_buffer_unref (buffer);
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ret = gst_pad_push (mulawenc->srcpad, outbuf);
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done:
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gst_object_unref (mulawenc);
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return ret;
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not_negotiated:
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{
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GST_DEBUG_OBJECT (mulawenc, "no format negotiated");
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ret = GST_FLOW_NOT_NEGOTIATED;
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gst_buffer_unref (buffer);
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goto done;
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}
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alloc_failed:
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{
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GST_DEBUG_OBJECT (mulawenc, "pad alloc failed");
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gst_buffer_unref (buffer);
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goto done;
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}
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}
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