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303 lines
8 KiB
C
303 lines
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 <gst/audio/audio.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 gboolean gst_mulawenc_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_mulawenc_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buffer);
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#define gst_mulawenc_parent_class parent_class
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G_DEFINE_TYPE (GstMuLawEnc, gst_mulawenc, GST_TYPE_ELEMENT);
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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, GstCaps * filter)
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{
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GstMuLawEnc *mulawenc;
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GstPad *otherpad;
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GstCaps *othercaps, *result;
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GstCaps *templ;
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const gchar *name;
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gint i;
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mulawenc = GST_MULAWENC (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 == mulawenc->srcpad) {
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name = "audio/x-mulaw";
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otherpad = mulawenc->sinkpad;
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} else {
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name = "audio/x-raw";
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otherpad = mulawenc->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_query_caps (otherpad, NULL);
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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 == mulawenc->srcpad) {
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/* remove the fields we don't want */
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gst_structure_remove_fields (structure, "format", NULL);
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} else {
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/* add fixed fields */
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gst_structure_set (structure, "format", G_TYPE_STRING,
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GST_AUDIO_NE (S16), 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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gst_caps_unref (templ);
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} else {
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/* there was no peer, return the template caps */
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result = templ;
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}
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if (filter && result) {
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GstCaps *temp;
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temp = gst_caps_intersect (result, filter);
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gst_caps_unref (result);
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result = temp;
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}
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return result;
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}
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static gboolean
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gst_mulawenc_query (GstPad * pad, GstObject * parent, GstQuery * query)
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{
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gboolean res;
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_CAPS:
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{
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GstCaps *filter, *caps;
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gst_query_parse_caps (query, &filter);
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caps = mulawenc_getcaps (pad, filter);
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gst_query_set_caps_result (query, caps);
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gst_caps_unref (caps);
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res = TRUE;
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break;
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}
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default:
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res = gst_pad_query_default (pad, parent, query);
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break;
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}
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return res;
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}
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static gboolean
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mulawenc_setcaps (GstMuLawEnc * mulawenc, GstCaps * caps)
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{
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GstStructure *structure;
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GstCaps *base_caps;
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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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base_caps = gst_pad_get_pad_template_caps (mulawenc->srcpad);
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base_caps = gst_caps_make_writable (base_caps);
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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 (mulawenc->srcpad, base_caps);
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gst_caps_unref (base_caps);
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return TRUE;
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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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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_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_static_metadata (element_class, "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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}
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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_query_function (mulawenc->sinkpad, gst_mulawenc_query);
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gst_pad_set_event_function (mulawenc->sinkpad, gst_mulawenc_event);
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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_query_function (mulawenc->srcpad, gst_mulawenc_query);
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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 gboolean
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gst_mulawenc_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstMuLawEnc *mulawenc;
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gboolean res;
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mulawenc = GST_MULAWENC (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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gst_event_parse_caps (event, &caps);
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mulawenc_setcaps (mulawenc, caps);
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gst_event_unref (event);
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res = TRUE;
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break;
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}
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default:
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res = gst_pad_event_default (pad, parent, event);
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break;
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}
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return res;
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}
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static GstFlowReturn
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gst_mulawenc_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
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{
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GstMuLawEnc *mulawenc;
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GstMapInfo inmap, outmap;
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gint16 *linear_data;
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gsize 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 (parent);
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if (!mulawenc->rate || !mulawenc->channels)
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goto not_negotiated;
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gst_buffer_map (buffer, &inmap, GST_MAP_READ);
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linear_data = (gint16 *) inmap.data;
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linear_size = inmap.size;
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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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outbuf = gst_buffer_new_allocate (NULL, mulaw_size, NULL);
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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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gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE);
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mulaw_data = outmap.data;
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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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mulaw_encode (linear_data, mulaw_data, mulaw_size);
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gst_buffer_unmap (outbuf, &outmap);
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gst_buffer_unmap (buffer, &inmap);
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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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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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}
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