ext/amrnb/amrnbdec.c - gst-plugins-ugly1.0 - Git at Google

 /* 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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 /**
  * SECTION:element-amrnbdec
  * @see_also: #GstAmrnbEnc, #GstAmrParse
  *
  * AMR narrowband decoder based on the
  * <ulink url="http://sourceforge.net/projects/opencore-amr">opencore codec implementation</ulink>.
  *
  * <refsect2>
  * <title>Example launch line</title>
  * |[
  * gst-launch-1.0 filesrc location=abc.amr ! amrparse ! amrnbdec ! audioconvert ! audioresample ! autoaudiosink
  * ]|
  * </refsect2>
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include "amrnbdec.h"

 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("audio/AMR, " "rate = (int) 8000, " "channels = (int) 1")
     );

 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("audio/x-raw, format = (string) " GST_AUDIO_NE (S16) ", "
         "layout = (string) interleaved, "
         "rate = (int) 8000," "channels = (int) 1")
     );

 GST_DEBUG_CATEGORY_STATIC (gst_amrnbdec_debug);
 #define GST_CAT_DEFAULT gst_amrnbdec_debug

 static const gint block_size_if1[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5,
   0, 0, 0, 0, 0, 0, 0
 };

 static const gint block_size_if2[16] = { 12, 13, 15, 17, 18, 20, 25, 30, 5,
   0, 0, 0, 0, 0, 0, 0
 };

 static GType
 gst_amrnb_variant_get_type (void)
 {
   static GType gst_amrnb_variant_type = 0;
   static const GEnumValue gst_amrnb_variant[] = {
     {GST_AMRNB_VARIANT_IF1, "IF1", "IF1"},
     {GST_AMRNB_VARIANT_IF2, "IF2", "IF2"},
     {0, NULL, NULL},
   };
   if (!gst_amrnb_variant_type) {
     gst_amrnb_variant_type =
         g_enum_register_static ("GstAmrnbVariant", gst_amrnb_variant);
   }
   return gst_amrnb_variant_type;
 }

 #define GST_AMRNB_VARIANT_TYPE (gst_amrnb_variant_get_type())

 #define VARIANT_DEFAULT GST_AMRNB_VARIANT_IF1
 enum
 {
   PROP_0,
   PROP_VARIANT
 };

 static void gst_amrnbdec_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);
 static void gst_amrnbdec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);

 static gboolean gst_amrnbdec_start (GstAudioDecoder * dec);
 static gboolean gst_amrnbdec_stop (GstAudioDecoder * dec);
 static gboolean gst_amrnbdec_set_format (GstAudioDecoder * dec, GstCaps * caps);
 static GstFlowReturn gst_amrnbdec_parse (GstAudioDecoder * dec,
     GstAdapter * adapter, gint * offset, gint * length);
 static GstFlowReturn gst_amrnbdec_handle_frame (GstAudioDecoder * dec,
     GstBuffer * buffer);

 #define gst_amrnbdec_parent_class parent_class
 G_DEFINE_TYPE (GstAmrnbDec, gst_amrnbdec, GST_TYPE_AUDIO_DECODER);

 static void
 gst_amrnbdec_class_init (GstAmrnbDecClass * klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
   GstAudioDecoderClass *base_class = GST_AUDIO_DECODER_CLASS (klass);

   object_class->set_property = gst_amrnbdec_set_property;
   object_class->get_property = gst_amrnbdec_get_property;

   gst_element_class_add_static_pad_template (element_class, &sink_template);
   gst_element_class_add_static_pad_template (element_class, &src_template);

   gst_element_class_set_static_metadata (element_class, "AMR-NB audio decoder",
       "Codec/Decoder/Audio",
       "Adaptive Multi-Rate Narrow-Band audio decoder",
       "GStreamer maintainers <gstreamer-devel@lists.freedesktop.org>");

   base_class->start = GST_DEBUG_FUNCPTR (gst_amrnbdec_start);
   base_class->stop = GST_DEBUG_FUNCPTR (gst_amrnbdec_stop);
   base_class->set_format = GST_DEBUG_FUNCPTR (gst_amrnbdec_set_format);
   base_class->parse = GST_DEBUG_FUNCPTR (gst_amrnbdec_parse);
   base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_amrnbdec_handle_frame);

   g_object_class_install_property (object_class, PROP_VARIANT,
       g_param_spec_enum ("variant", "Variant",
           "The decoder variant", GST_AMRNB_VARIANT_TYPE,
           VARIANT_DEFAULT,
           G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));

   GST_DEBUG_CATEGORY_INIT (gst_amrnbdec_debug, "amrnbdec", 0,
       "AMR-NB audio decoder");
 }

 static void
 gst_amrnbdec_init (GstAmrnbDec * amrnbdec)
 {
   gst_audio_decoder_set_needs_format (GST_AUDIO_DECODER (amrnbdec), TRUE);
   gst_audio_decoder_set_use_default_pad_acceptcaps (GST_AUDIO_DECODER_CAST
       (amrnbdec), TRUE);
   GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_DECODER_SINK_PAD (amrnbdec));
 }

 static gboolean
 gst_amrnbdec_start (GstAudioDecoder * dec)
 {
   GstAmrnbDec *amrnbdec = GST_AMRNBDEC (dec);

   GST_DEBUG_OBJECT (dec, "start");
   if (!(amrnbdec->handle = Decoder_Interface_init ()))
     return FALSE;

   amrnbdec->rate = 0;
   amrnbdec->channels = 0;

   return TRUE;
 }

 static gboolean
 gst_amrnbdec_stop (GstAudioDecoder * dec)
 {
   GstAmrnbDec *amrnbdec = GST_AMRNBDEC (dec);

   GST_DEBUG_OBJECT (dec, "stop");
   Decoder_Interface_exit (amrnbdec->handle);

   return TRUE;
 }

 static void
 gst_amrnbdec_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstAmrnbDec *self = GST_AMRNBDEC (object);

   switch (prop_id) {
     case PROP_VARIANT:
       self->variant = g_value_get_enum (value);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
   return;
 }

 static void
 gst_amrnbdec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstAmrnbDec *self = GST_AMRNBDEC (object);

   switch (prop_id) {
     case PROP_VARIANT:
       g_value_set_enum (value, self->variant);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
   return;
 }

 static gboolean
 gst_amrnbdec_set_format (GstAudioDecoder * dec, GstCaps * caps)
 {
   GstStructure *structure;
   GstAmrnbDec *amrnbdec;
   GstAudioInfo info;

   amrnbdec = GST_AMRNBDEC (dec);

   structure = gst_caps_get_structure (caps, 0);

   /* get channel count */
   gst_structure_get_int (structure, "channels", &amrnbdec->channels);
   gst_structure_get_int (structure, "rate", &amrnbdec->rate);

   /* create reverse caps */
   gst_audio_info_init (&info);
   gst_audio_info_set_format (&info,
       GST_AUDIO_FORMAT_S16, amrnbdec->rate, amrnbdec->channels, NULL);

   return gst_audio_decoder_set_output_format (dec, &info);
 }

 static GstFlowReturn
 gst_amrnbdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
     gint * offset, gint * length)
 {
   GstAmrnbDec *amrnbdec = GST_AMRNBDEC (dec);
   guint8 head[1];
   guint size;
   gboolean sync, eos;
   gint block, mode;

   size = gst_adapter_available (adapter);
   g_return_val_if_fail (size > 0, GST_FLOW_ERROR);

   gst_audio_decoder_get_parse_state (dec, &sync, &eos);

   /* need to peek data to get the size */
   if (size < 1)
     return GST_FLOW_ERROR;

   gst_adapter_copy (adapter, head, 0, 1);

   /* get size */
   switch (amrnbdec->variant) {
     case GST_AMRNB_VARIANT_IF1:
       mode = (head[0] >> 3) & 0x0F;
       block = block_size_if1[mode] + 1;
       break;
     case GST_AMRNB_VARIANT_IF2:
       mode = head[0] & 0x0F;
       block = block_size_if2[mode] + 1;
       break;
     default:
       g_assert_not_reached ();
       return GST_FLOW_ERROR;
       break;
   }

   GST_DEBUG_OBJECT (amrnbdec, "mode %d, block %d", mode, block);

   if (block > size)
     return GST_FLOW_EOS;

   *offset = 0;
   *length = block;

   return GST_FLOW_OK;
 }

 static GstFlowReturn
 gst_amrnbdec_handle_frame (GstAudioDecoder * dec, GstBuffer * buffer)
 {
   GstAmrnbDec *amrnbdec;
   GstMapInfo inmap, outmap;
   GstBuffer *out;

   amrnbdec = GST_AMRNBDEC (dec);

   /* no fancy flushing */
   if (!buffer || !gst_buffer_get_size (buffer))
     return GST_FLOW_OK;

   gst_buffer_map (buffer, &inmap, GST_MAP_READ);

   /* get output */
   out = gst_buffer_new_and_alloc (160 * 2);
   /* decode */
   gst_buffer_map (out, &outmap, GST_MAP_WRITE);
   Decoder_Interface_Decode (amrnbdec->handle, inmap.data,
       (gint16 *) outmap.data, 0);
   gst_buffer_unmap (out, &outmap);

   gst_buffer_unmap (buffer, &inmap);

   return gst_audio_decoder_finish_frame (dec, out, 1);
 }
	/* 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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	/**
	* SECTION:element-amrnbdec
	* @see_also: #GstAmrnbEnc, #GstAmrParse
	*
	* AMR narrowband decoder based on the
	* <ulink url="http://sourceforge.net/projects/opencore-amr">opencore codec implementation</ulink>.
	*
	* <refsect2>
	* <title>Example launch line</title>
	* \|[
	* gst-launch-1.0 filesrc location=abc.amr ! amrparse ! amrnbdec ! audioconvert ! audioresample ! autoaudiosink
	* ]\|
	* </refsect2>
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include "amrnbdec.h"

	static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("audio/AMR, " "rate = (int) 8000, " "channels = (int) 1")
	);

	static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("audio/x-raw, format = (string) " GST_AUDIO_NE (S16) ", "
	"layout = (string) interleaved, "
	"rate = (int) 8000," "channels = (int) 1")
	);

	GST_DEBUG_CATEGORY_STATIC (gst_amrnbdec_debug);
	#define GST_CAT_DEFAULT gst_amrnbdec_debug

	static const gint block_size_if1[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5,
	0, 0, 0, 0, 0, 0, 0
	};

	static const gint block_size_if2[16] = { 12, 13, 15, 17, 18, 20, 25, 30, 5,
	0, 0, 0, 0, 0, 0, 0
	};

	static GType
	gst_amrnb_variant_get_type (void)
	{
	static GType gst_amrnb_variant_type = 0;
	static const GEnumValue gst_amrnb_variant[] = {
	{GST_AMRNB_VARIANT_IF1, "IF1", "IF1"},
	{GST_AMRNB_VARIANT_IF2, "IF2", "IF2"},
	{0, NULL, NULL},
	};
	if (!gst_amrnb_variant_type) {
	gst_amrnb_variant_type =
	g_enum_register_static ("GstAmrnbVariant", gst_amrnb_variant);
	}
	return gst_amrnb_variant_type;
	}

	#define GST_AMRNB_VARIANT_TYPE (gst_amrnb_variant_get_type())

	#define VARIANT_DEFAULT GST_AMRNB_VARIANT_IF1
	enum
	{
	PROP_0,
	PROP_VARIANT
	};

	static void gst_amrnbdec_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec);
	static void gst_amrnbdec_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec);

	static gboolean gst_amrnbdec_start (GstAudioDecoder * dec);
	static gboolean gst_amrnbdec_stop (GstAudioDecoder * dec);
	static gboolean gst_amrnbdec_set_format (GstAudioDecoder * dec, GstCaps * caps);
	static GstFlowReturn gst_amrnbdec_parse (GstAudioDecoder * dec,
	GstAdapter * adapter, gint * offset, gint * length);
	static GstFlowReturn gst_amrnbdec_handle_frame (GstAudioDecoder * dec,
	GstBuffer * buffer);

	#define gst_amrnbdec_parent_class parent_class
	G_DEFINE_TYPE (GstAmrnbDec, gst_amrnbdec, GST_TYPE_AUDIO_DECODER);

	static void
	gst_amrnbdec_class_init (GstAmrnbDecClass * klass)
	{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
	GstAudioDecoderClass *base_class = GST_AUDIO_DECODER_CLASS (klass);

	object_class->set_property = gst_amrnbdec_set_property;
	object_class->get_property = gst_amrnbdec_get_property;

	gst_element_class_add_static_pad_template (element_class, &sink_template);
	gst_element_class_add_static_pad_template (element_class, &src_template);

	gst_element_class_set_static_metadata (element_class, "AMR-NB audio decoder",
	"Codec/Decoder/Audio",
	"Adaptive Multi-Rate Narrow-Band audio decoder",
	"GStreamer maintainers <gstreamer-devel@lists.freedesktop.org>");

	base_class->start = GST_DEBUG_FUNCPTR (gst_amrnbdec_start);
	base_class->stop = GST_DEBUG_FUNCPTR (gst_amrnbdec_stop);
	base_class->set_format = GST_DEBUG_FUNCPTR (gst_amrnbdec_set_format);
	base_class->parse = GST_DEBUG_FUNCPTR (gst_amrnbdec_parse);
	base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_amrnbdec_handle_frame);

	g_object_class_install_property (object_class, PROP_VARIANT,
	g_param_spec_enum ("variant", "Variant",
	"The decoder variant", GST_AMRNB_VARIANT_TYPE,
	VARIANT_DEFAULT,
	G_PARAM_READWRITE \| G_PARAM_CONSTRUCT \| G_PARAM_STATIC_STRINGS));

	GST_DEBUG_CATEGORY_INIT (gst_amrnbdec_debug, "amrnbdec", 0,
	"AMR-NB audio decoder");
	}

	static void
	gst_amrnbdec_init (GstAmrnbDec * amrnbdec)
	{
	gst_audio_decoder_set_needs_format (GST_AUDIO_DECODER (amrnbdec), TRUE);
	gst_audio_decoder_set_use_default_pad_acceptcaps (GST_AUDIO_DECODER_CAST
	(amrnbdec), TRUE);
	GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_DECODER_SINK_PAD (amrnbdec));
	}

	static gboolean
	gst_amrnbdec_start (GstAudioDecoder * dec)
	{
	GstAmrnbDec *amrnbdec = GST_AMRNBDEC (dec);

	GST_DEBUG_OBJECT (dec, "start");
	if (!(amrnbdec->handle = Decoder_Interface_init ()))
	return FALSE;

	amrnbdec->rate = 0;
	amrnbdec->channels = 0;

	return TRUE;
	}

	static gboolean
	gst_amrnbdec_stop (GstAudioDecoder * dec)
	{
	GstAmrnbDec *amrnbdec = GST_AMRNBDEC (dec);

	GST_DEBUG_OBJECT (dec, "stop");
	Decoder_Interface_exit (amrnbdec->handle);

	return TRUE;
	}

	static void
	gst_amrnbdec_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstAmrnbDec *self = GST_AMRNBDEC (object);

	switch (prop_id) {
	case PROP_VARIANT:
	self->variant = g_value_get_enum (value);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	return;
	}

	static void
	gst_amrnbdec_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec)
	{
	GstAmrnbDec *self = GST_AMRNBDEC (object);

	switch (prop_id) {
	case PROP_VARIANT:
	g_value_set_enum (value, self->variant);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	return;
	}

	static gboolean
	gst_amrnbdec_set_format (GstAudioDecoder * dec, GstCaps * caps)
	{
	GstStructure *structure;
	GstAmrnbDec *amrnbdec;
	GstAudioInfo info;

	amrnbdec = GST_AMRNBDEC (dec);

	structure = gst_caps_get_structure (caps, 0);

	/* get channel count */
	gst_structure_get_int (structure, "channels", &amrnbdec->channels);
	gst_structure_get_int (structure, "rate", &amrnbdec->rate);

	/* create reverse caps */
	gst_audio_info_init (&info);
	gst_audio_info_set_format (&info,
	GST_AUDIO_FORMAT_S16, amrnbdec->rate, amrnbdec->channels, NULL);

	return gst_audio_decoder_set_output_format (dec, &info);
	}

	static GstFlowReturn
	gst_amrnbdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
	gint * offset, gint * length)
	{
	GstAmrnbDec *amrnbdec = GST_AMRNBDEC (dec);
	guint8 head[1];
	guint size;
	gboolean sync, eos;
	gint block, mode;

	size = gst_adapter_available (adapter);
	g_return_val_if_fail (size > 0, GST_FLOW_ERROR);

	gst_audio_decoder_get_parse_state (dec, &sync, &eos);

	/* need to peek data to get the size */
	if (size < 1)
	return GST_FLOW_ERROR;

	gst_adapter_copy (adapter, head, 0, 1);

	/* get size */
	switch (amrnbdec->variant) {
	case GST_AMRNB_VARIANT_IF1:
	mode = (head[0] >> 3) & 0x0F;
	block = block_size_if1[mode] + 1;
	break;
	case GST_AMRNB_VARIANT_IF2:
	mode = head[0] & 0x0F;
	block = block_size_if2[mode] + 1;
	break;
	default:
	g_assert_not_reached ();
	return GST_FLOW_ERROR;
	break;
	}

	GST_DEBUG_OBJECT (amrnbdec, "mode %d, block %d", mode, block);

	if (block > size)
	return GST_FLOW_EOS;

	*offset = 0;
	*length = block;

	return GST_FLOW_OK;
	}

	static GstFlowReturn
	gst_amrnbdec_handle_frame (GstAudioDecoder * dec, GstBuffer * buffer)
	{
	GstAmrnbDec *amrnbdec;
	GstMapInfo inmap, outmap;
	GstBuffer *out;

	amrnbdec = GST_AMRNBDEC (dec);

	/* no fancy flushing */
	if (!buffer \|\| !gst_buffer_get_size (buffer))
	return GST_FLOW_OK;

	gst_buffer_map (buffer, &inmap, GST_MAP_READ);

	/* get output */
	out = gst_buffer_new_and_alloc (160 * 2);
	/* decode */
	gst_buffer_map (out, &outmap, GST_MAP_WRITE);
	Decoder_Interface_Decode (amrnbdec->handle, inmap.data,
	(gint16 *) outmap.data, 0);
	gst_buffer_unmap (out, &outmap);

	gst_buffer_unmap (buffer, &inmap);

	return gst_audio_decoder_finish_frame (dec, out, 1);
	}