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-rw-r--r--ext/amrwb/gstamrwbdec.c297
1 files changed, 297 insertions, 0 deletions
diff --git a/ext/amrwb/gstamrwbdec.c b/ext/amrwb/gstamrwbdec.c
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+++ b/ext/amrwb/gstamrwbdec.c
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+/* GStreamer Adaptive Multi-Rate Narrow-Band (AMR-NB) plugin
+ * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstamrwbdec.h"
+
+static GstElementDetails gst_amrwbdec_details = {
+ "AMR-WB decoder",
+ "Codec/Decoder/Audio",
+ "Adaptive Multi-Rate Wideband audio decoder",
+ "Renato Araujo <renato.filho@indt.org.br>"
+};
+
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("audio/AMR-WB, "
+ "rate = (int) 16000, " "channels = (int) 1")
+ );
+
+static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("audio/x-raw-int, "
+ "width = (int) 16, "
+ "depth = (int) 16, "
+ "signed = (boolean) TRUE, "
+ "endianness = (int) BYTE_ORDER, "
+ "rate = (int) 16000, " "channels = (int) 1")
+ );
+
+extern const UWord8 block_size[];
+
+static void gst_amrwbdec_base_init (gpointer klass);
+static void gst_amrwbdec_class_init (GstAmrwbDecClass * klass);
+static void gst_amrwbdec_init (GstAmrwbDec * amrwbdec,
+ GstAmrwbDecClass * klass);
+
+static gboolean gst_amrwbdec_event (GstPad * pad, GstEvent * event);
+static GstFlowReturn gst_amrwbdec_chain (GstPad * pad, GstBuffer * buffer);
+static gboolean gst_amrwbdec_setcaps (GstPad * pad, GstCaps * caps);
+static GstStateChangeReturn gst_amrwbdec_state_change (GstElement * element,
+ GstStateChange transition);
+
+GST_BOILERPLATE (GstAmrwbDec, gst_amrwbdec, GstElement, GST_TYPE_ELEMENT)
+
+ static void gst_amrwbdec_base_init (gpointer klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&sink_template));
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&src_template));
+
+ gst_element_class_set_details (element_class, &gst_amrwbdec_details);
+}
+
+static void
+gst_amrwbdec_class_init (GstAmrwbDecClass * klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+ parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+ element_class->change_state = gst_amrwbdec_state_change;
+}
+
+static void
+gst_amrwbdec_init (GstAmrwbDec * amrwbdec, GstAmrwbDecClass * klass)
+{
+ /* create the sink pad */
+ amrwbdec->sinkpad =
+ gst_pad_new_from_template (gst_static_pad_template_get (&sink_template),
+ "sink");
+ gst_pad_set_setcaps_function (amrwbdec->sinkpad, gst_amrwbdec_setcaps);
+ gst_pad_set_event_function (amrwbdec->sinkpad, gst_amrwbdec_event);
+ gst_pad_set_chain_function (amrwbdec->sinkpad, gst_amrwbdec_chain);
+ gst_element_add_pad (GST_ELEMENT (amrwbdec), amrwbdec->sinkpad);
+
+ /* create the src pad */
+ amrwbdec->srcpad =
+ gst_pad_new_from_template (gst_static_pad_template_get (&src_template),
+ "src");
+ gst_pad_use_fixed_caps (amrwbdec->srcpad);
+ gst_element_add_pad (GST_ELEMENT (amrwbdec), amrwbdec->srcpad);
+
+ amrwbdec->adapter = gst_adapter_new ();
+
+ /* init rest */
+ amrwbdec->handle = NULL;
+ amrwbdec->channels = 0;
+ amrwbdec->rate = 0;
+ amrwbdec->duration = 0;
+ amrwbdec->ts = -1;
+}
+
+static gboolean
+gst_amrwbdec_setcaps (GstPad * pad, GstCaps * caps)
+{
+ GstStructure *structure;
+ GstAmrwbDec *amrwbdec;
+ GstCaps *copy;
+
+ amrwbdec = GST_AMRWBDEC (gst_pad_get_parent (pad));
+
+ structure = gst_caps_get_structure (caps, 0);
+
+ /* get channel count */
+ gst_structure_get_int (structure, "channels", &amrwbdec->channels);
+ gst_structure_get_int (structure, "rate", &amrwbdec->rate);
+
+ /* create reverse caps */
+ copy = gst_caps_new_simple ("audio/x-raw-int",
+ "channels", G_TYPE_INT, amrwbdec->channels,
+ "width", G_TYPE_INT, 16,
+ "depth", G_TYPE_INT, 16,
+ "endianness", G_TYPE_INT, G_BYTE_ORDER,
+ "rate", G_TYPE_INT, amrwbdec->rate, "signed", G_TYPE_BOOLEAN, TRUE, NULL);
+
+ amrwbdec->duration = gst_util_uint64_scale_int (GST_SECOND, L_FRAME16k,
+ amrwbdec->rate * amrwbdec->channels);
+
+ gst_pad_set_caps (amrwbdec->srcpad, copy);
+ gst_caps_unref (copy);
+
+ gst_object_unref (amrwbdec);
+
+ return TRUE;
+}
+
+static gboolean
+gst_amrwbdec_event (GstPad * pad, GstEvent * event)
+{
+ GstAmrwbDec *amrwbdec;
+ gboolean ret = TRUE;
+
+ amrwbdec = GST_AMRWBDEC (gst_pad_get_parent (pad));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_FLUSH_START:
+ ret = gst_pad_push_event (amrwbdec->srcpad, event);
+ break;
+ case GST_EVENT_FLUSH_STOP:
+ ret = gst_pad_push_event (amrwbdec->srcpad, event);
+ gst_adapter_clear (amrwbdec->adapter);
+ amrwbdec->ts = -1;
+ break;
+ case GST_EVENT_EOS:
+ gst_adapter_clear (amrwbdec->adapter);
+ ret = gst_pad_push_event (amrwbdec->srcpad, event);
+ break;
+ default:
+ ret = gst_pad_push_event (amrwbdec->srcpad, event);
+ break;
+ }
+ gst_object_unref (amrwbdec);
+
+ return ret;
+}
+
+static GstFlowReturn
+gst_amrwbdec_chain (GstPad * pad, GstBuffer * buffer)
+{
+ GstAmrwbDec *amrwbdec;
+ GstFlowReturn ret = GST_FLOW_OK;
+
+ amrwbdec = GST_AMRWBDEC (gst_pad_get_parent (pad));
+
+ if (amrwbdec->rate == 0 || amrwbdec->channels == 0) {
+ GST_ELEMENT_ERROR (amrwbdec, STREAM, TYPE_NOT_FOUND, (NULL),
+ ("Decoder is not initialized"));
+ ret = GST_FLOW_NOT_NEGOTIATED;
+ goto done;
+ }
+
+
+ if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
+ amrwbdec->ts = GST_BUFFER_TIMESTAMP (buffer);
+
+ gst_adapter_push (amrwbdec->adapter, buffer);
+
+ while (TRUE) {
+ GstBuffer *out;
+ UWord8 *data;
+ Word16 block, mode;
+
+
+ if (gst_adapter_available (amrwbdec->adapter) < 1)
+ break;
+
+ data = (UWord8 *) gst_adapter_peek (amrwbdec->adapter, 1);
+
+ /* get size */
+ mode = (Word16) (data[0] >> 3) & 0x0F;
+ block = block_size[mode];
+
+ if (gst_adapter_available (amrwbdec->adapter) < block) {
+ break;
+ }
+
+ /* the library seems to write into the source data, hence
+ * the copy. */
+ data = (UWord8 *) gst_adapter_take (amrwbdec->adapter, block);
+
+ /* get output */
+ out = gst_buffer_new_and_alloc (sizeof (Word16) * L_FRAME16k);
+
+ GST_BUFFER_DURATION (out) = amrwbdec->duration;
+ GST_BUFFER_TIMESTAMP (out) = amrwbdec->ts;
+
+ if (amrwbdec->ts != -1)
+ amrwbdec->ts += GST_BUFFER_DURATION (out);
+
+ gst_buffer_set_caps (out, GST_PAD_CAPS (amrwbdec->srcpad));
+
+ /* decode */
+ D_IF_decode (amrwbdec->handle, data,
+ (Word16 *) GST_BUFFER_DATA (out), _good_frame);
+
+ g_free (data);
+
+ /* play */
+ ret = gst_pad_push (amrwbdec->srcpad, out);
+ }
+
+done:
+
+ gst_object_unref (amrwbdec);
+ return ret;
+
+}
+
+static GstStateChangeReturn
+gst_amrwbdec_state_change (GstElement * element, GstStateChange transition)
+{
+ GstAmrwbDec *amrwbdec;
+ GstStateChangeReturn ret;
+
+ amrwbdec = GST_AMRWBDEC (element);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_NULL_TO_READY:
+ if (!(amrwbdec->handle = D_IF_init ()))
+ goto init_failed;
+ break;
+ case GST_STATE_CHANGE_READY_TO_PAUSED:
+ gst_adapter_clear (amrwbdec->adapter);
+ amrwbdec->rate = 0;
+ amrwbdec->channels = 0;
+ amrwbdec->ts = -1;
+ break;
+ default:
+ break;
+ }
+
+ ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_NULL:
+ D_IF_exit (amrwbdec->handle);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+
+ /* ERRORS */
+init_failed:
+ {
+ GST_ELEMENT_ERROR (amrwbdec, LIBRARY, INIT, (NULL),
+ ("Failed to open AMR Decoder"));
+ return GST_STATE_CHANGE_FAILURE;
+ }
+}
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