/* GStreamer Adaptive Multi-Rate Narrow-Band (AMR-NB) plugin * Copyright (C) 2004 Ronald Bultje * * 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 * opencore codec implementation. * * * Example launch line * |[ * gst-launch filesrc location=abc.amr ! amrparse ! amrnbdec ! audioresample ! audioconvert ! alsasink * ]| * */ #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 gboolean 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_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_static_metadata (element_class, "AMR-NB audio decoder", "Codec/Decoder/Audio", "Adaptive Multi-Rate Narrow-Band audio decoder", "GStreamer maintainers "); 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); } 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); }