--- a/gst_plugins_good/gst/law/mulaw-encode.c Fri Jul 09 16:26:45 2010 -0500
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,299 +0,0 @@
-/* GStreamer
- * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-/**
- * SECTION:element-mulawenc
- *
- * This element encode mulaw audio. Mulaw coding is also known as G.711.
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-#include <gst/gst.h>
-#include "mulaw-encode.h"
-#include "mulaw-conversion.h"
-
-extern GstStaticPadTemplate mulaw_enc_src_factory;
-extern GstStaticPadTemplate mulaw_enc_sink_factory;
-
-/* Stereo signals and args */
-enum
-{
- /* FILL ME */
- LAST_SIGNAL
-};
-
-enum
-{
- ARG_0
-};
-
-static void gst_mulawenc_class_init (GstMuLawEncClass * klass);
-static void gst_mulawenc_base_init (GstMuLawEncClass * klass);
-static void gst_mulawenc_init (GstMuLawEnc * mulawenc);
-
-static GstFlowReturn gst_mulawenc_chain (GstPad * pad, GstBuffer * buffer);
-
-static GstElementClass *parent_class = NULL;
-
-/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
-
-static GstCaps *
-mulawenc_getcaps (GstPad * pad)
-{
- GstMuLawEnc *mulawenc;
- GstPad *otherpad;
- GstCaps *othercaps, *result;
- const GstCaps *templ;
- gchar *name;
- gint i;
-
- mulawenc = GST_MULAWENC (GST_PAD_PARENT (pad));
-
- /* figure out the name of the caps we are going to return */
- if (pad == mulawenc->srcpad) {
- name = "audio/x-mulaw";
- otherpad = mulawenc->sinkpad;
- } else {
- name = "audio/x-raw-int";
- otherpad = mulawenc->srcpad;
- }
- /* get caps from the peer, this can return NULL when there is no peer */
- othercaps = gst_pad_peer_get_caps (otherpad);
-
- /* get the template caps to make sure we return something acceptable */
- templ = gst_pad_get_pad_template_caps (pad);
-
- if (othercaps) {
- /* there was a peer */
- othercaps = gst_caps_make_writable (othercaps);
-
- /* go through the caps and remove the fields we don't want */
- for (i = 0; i < gst_caps_get_size (othercaps); i++) {
- GstStructure *structure;
-
- structure = gst_caps_get_structure (othercaps, i);
-
- /* adjust the name */
- gst_structure_set_name (structure, name);
-
- if (pad == mulawenc->srcpad) {
- /* remove the fields we don't want */
- gst_structure_remove_fields (structure, "width", "depth", "endianness",
- "signed", NULL);
- } else {
- /* add fixed fields */
- gst_structure_set (structure, "width", G_TYPE_INT, 16,
- "depth", G_TYPE_INT, 16,
- "endianness", G_TYPE_INT, G_BYTE_ORDER,
- "signed", G_TYPE_BOOLEAN, TRUE, NULL);
- }
- }
- /* filter against the allowed caps of the pad to return our result */
- result = gst_caps_intersect (othercaps, templ);
- gst_caps_unref (othercaps);
- } else {
- /* there was no peer, return the template caps */
- result = gst_caps_copy (templ);
- }
- return result;
-}
-
-static gboolean
-mulawenc_setcaps (GstPad * pad, GstCaps * caps)
-{
- GstMuLawEnc *mulawenc;
- GstPad *otherpad;
- GstStructure *structure;
- GstCaps *base_caps;
-
- mulawenc = GST_MULAWENC (gst_pad_get_parent (pad));
-
- structure = gst_caps_get_structure (caps, 0);
- gst_structure_get_int (structure, "channels", &mulawenc->channels);
- gst_structure_get_int (structure, "rate", &mulawenc->rate);
-
- if (pad == mulawenc->sinkpad) {
- otherpad = mulawenc->srcpad;
- } else {
- otherpad = mulawenc->sinkpad;
- }
- base_caps = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad));
-
- structure = gst_caps_get_structure (base_caps, 0);
- gst_structure_set (structure, "rate", G_TYPE_INT, mulawenc->rate, NULL);
- gst_structure_set (structure, "channels", G_TYPE_INT, mulawenc->channels,
- NULL);
-
- gst_pad_set_caps (otherpad, base_caps);
-
- gst_object_unref (mulawenc);
- gst_caps_unref (base_caps);
-
- return TRUE;
-}
-
-GType
-gst_mulawenc_get_type (void)
-{
- static GType mulawenc_type = 0;
-
- if (!mulawenc_type) {
- static const GTypeInfo mulawenc_info = {
- sizeof (GstMuLawEncClass),
- (GBaseInitFunc) gst_mulawenc_base_init,
- NULL,
- (GClassInitFunc) gst_mulawenc_class_init,
- NULL,
- NULL,
- sizeof (GstMuLawEnc),
- 0,
- (GInstanceInitFunc) gst_mulawenc_init,
- };
-
- mulawenc_type =
- g_type_register_static (GST_TYPE_ELEMENT, "GstMuLawEnc", &mulawenc_info,
- 0);
- }
- return mulawenc_type;
-}
-
-static void
-gst_mulawenc_base_init (GstMuLawEncClass * klass)
-{
- GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
- const GstElementDetails mulawenc_details =
- GST_ELEMENT_DETAILS ("Mu Law audio encoder",
- "Codec/Encoder/Audio",
- "Convert 16bit PCM to 8bit mu law",
- "Zaheer Abbas Merali <zaheerabbas at merali dot org>");
-
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&mulaw_enc_src_factory));
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&mulaw_enc_sink_factory));
- gst_element_class_set_details (element_class, &mulawenc_details);
-}
-
-static void
-gst_mulawenc_class_init (GstMuLawEncClass * klass)
-{
- parent_class = g_type_class_peek_parent (klass);
-}
-
-static void
-gst_mulawenc_init (GstMuLawEnc * mulawenc)
-{
- mulawenc->sinkpad =
- gst_pad_new_from_static_template (&mulaw_enc_sink_factory, "sink");
- gst_pad_set_setcaps_function (mulawenc->sinkpad, mulawenc_setcaps);
- gst_pad_set_getcaps_function (mulawenc->sinkpad, mulawenc_getcaps);
- gst_pad_set_chain_function (mulawenc->sinkpad, gst_mulawenc_chain);
- gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->sinkpad);
-
- mulawenc->srcpad =
- gst_pad_new_from_static_template (&mulaw_enc_src_factory, "src");
- gst_pad_set_setcaps_function (mulawenc->srcpad, mulawenc_setcaps);
- gst_pad_set_getcaps_function (mulawenc->srcpad, mulawenc_getcaps);
- gst_pad_use_fixed_caps (mulawenc->srcpad);
- gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->srcpad);
-
- /* init rest */
- mulawenc->channels = 0;
- mulawenc->rate = 0;
-}
-
-static GstFlowReturn
-gst_mulawenc_chain (GstPad * pad, GstBuffer * buffer)
-{
- GstMuLawEnc *mulawenc;
- gint16 *linear_data;
- guint linear_size;
- guint8 *mulaw_data;
- guint mulaw_size;
- GstBuffer *outbuf;
- GstFlowReturn ret;
- GstClockTime timestamp, duration;
-
- mulawenc = GST_MULAWENC (gst_pad_get_parent (pad));
-
- if (!mulawenc->rate || !mulawenc->channels)
- goto not_negotiated;
-
- linear_data = (gint16 *) GST_BUFFER_DATA (buffer);
- linear_size = GST_BUFFER_SIZE (buffer);
-
- mulaw_size = linear_size / 2;
-
- timestamp = GST_BUFFER_TIMESTAMP (buffer);
- duration = GST_BUFFER_DURATION (buffer);
-
- ret = gst_pad_alloc_buffer_and_set_caps (mulawenc->srcpad,
- GST_BUFFER_OFFSET_NONE, mulaw_size, GST_PAD_CAPS (mulawenc->srcpad),
- &outbuf);
- if (ret != GST_FLOW_OK)
- goto alloc_failed;
-
- if (duration == -1) {
- duration = gst_util_uint64_scale_int (mulaw_size,
- GST_SECOND, mulawenc->rate * mulawenc->channels);
- }
-
- if (GST_BUFFER_SIZE (outbuf) < mulaw_size) {
- /* pad-alloc can suggest a smaller size */
- gst_buffer_unref (outbuf);
- outbuf = gst_buffer_new_and_alloc (mulaw_size);
- }
-
- mulaw_data = (guint8 *) GST_BUFFER_DATA (outbuf);
-
- /* copy discont flag */
- if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
- GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
-
- GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
- GST_BUFFER_DURATION (outbuf) = duration;
-
- gst_buffer_set_caps (outbuf, GST_PAD_CAPS (mulawenc->srcpad));
-
- mulaw_encode (linear_data, mulaw_data, mulaw_size);
-
- gst_buffer_unref (buffer);
-
- ret = gst_pad_push (mulawenc->srcpad, outbuf);
-
-done:
- gst_object_unref (mulawenc);
-
- return ret;
-
-not_negotiated:
- {
- GST_DEBUG_OBJECT (mulawenc, "no format negotiated");
- ret = GST_FLOW_NOT_NEGOTIATED;
- gst_buffer_unref (buffer);
- goto done;
- }
-alloc_failed:
- {
- GST_DEBUG_OBJECT (mulawenc, "pad alloc failed");
- gst_buffer_unref (buffer);
- goto done;
- }
-}