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258 lines
7 KiB
C
258 lines
7 KiB
C
/* GStreamer
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*
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* gstofa.c
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*
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* Copyright (C) 2006 M. Derezynski
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* Copyright (C) 2008 Eric Buehl
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* Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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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 <ofa1/ofa.h>
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#include "gstofa.h"
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#define PAD_CAPS \
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"audio/x-raw-int, " \
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"rate = (int) [ 1, MAX ], " \
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"channels = (int) [ 1, 2 ], " \
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"endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }, " \
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"width = (int) { 16 }, " \
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"depth = (int) { 16 }, " \
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"signed = (boolean) true"
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GST_DEBUG_CATEGORY_STATIC (gst_ofa_debug);
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#define GST_CAT_DEFAULT gst_ofa_debug
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enum
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{
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PROP_0,
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PROP_FINGERPRINT,
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};
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GST_BOILERPLATE (GstOFA, gst_ofa, GstAudioFilter, GST_TYPE_AUDIO_FILTER);
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static void gst_ofa_finalize (GObject * object);
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static void gst_ofa_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_ofa_transform_ip (GstBaseTransform * trans,
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GstBuffer * buf);
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static gboolean gst_ofa_event (GstBaseTransform * trans, GstEvent * event);
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static void
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gst_ofa_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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GstAudioFilterClass *audio_filter_class = (GstAudioFilterClass *) g_class;
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GstCaps *caps;
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gst_element_class_set_details_simple (gstelement_class, "OFA",
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"MusicIP Fingerprinting element",
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"Find a music fingerprint using MusicIP's libofa",
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"Milosz Derezynski <internalerror@gmail.com>, Eric Buehl <eric.buehl@gmail.com>");
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caps = gst_caps_from_string (PAD_CAPS);
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gst_audio_filter_class_add_pad_templates (audio_filter_class, caps);
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gst_caps_unref (caps);
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}
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static void
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gst_ofa_finalize (GObject * object)
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{
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GstOFA *ofa = GST_OFA (object);
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if (ofa->adapter) {
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g_object_unref (ofa->adapter);
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ofa->adapter = NULL;
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}
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g_free (ofa->fingerprint);
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ofa->fingerprint = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_ofa_class_init (GstOFAClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstBaseTransformClass *gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_ofa_get_property);
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g_object_class_install_property (gobject_class, PROP_FINGERPRINT,
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g_param_spec_string ("fingerprint", "Resulting fingerprint",
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"Resulting fingerprint", NULL,
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_ofa_finalize);
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gstbasetrans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_ofa_transform_ip);
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gstbasetrans_class->event = GST_DEBUG_FUNCPTR (gst_ofa_event);
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gstbasetrans_class->passthrough_on_same_caps = TRUE;
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}
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static void
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create_fingerprint (GstOFA * ofa)
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{
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GstBuffer *buf;
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gint rate = GST_AUDIO_FILTER (ofa)->format.rate;
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gint channels = GST_AUDIO_FILTER (ofa)->format.channels;
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gint endianness =
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(GST_AUDIO_FILTER (ofa)->format.
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bigend) ? OFA_BIG_ENDIAN : OFA_LITTLE_ENDIAN;
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GstTagList *tags;
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GST_DEBUG ("Generating fingerprint");
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buf =
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gst_adapter_take_buffer (ofa->adapter,
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gst_adapter_available (ofa->adapter));
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ofa->fingerprint = g_strdup (ofa_create_print (GST_BUFFER_DATA (buf),
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endianness, GST_BUFFER_SIZE (buf) / 2, rate,
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(channels == 2) ? 1 : 0));
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GST_DEBUG ("Generated fingerprint");
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gst_buffer_unref (buf);
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tags = gst_tag_list_new ();
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gst_tag_list_add (tags, GST_TAG_MERGE_REPLACE,
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GST_TAG_OFA_FINGERPRINT, ofa->fingerprint, NULL);
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gst_element_found_tags (GST_ELEMENT (ofa), tags);
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g_object_notify (G_OBJECT (ofa), "fingerprint");
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ofa->record = FALSE;
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}
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static gboolean
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gst_ofa_event (GstBaseTransform * trans, GstEvent * event)
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{
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GstOFA *ofa = GST_OFA (trans);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_STOP:
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case GST_EVENT_NEWSEGMENT:
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GST_DEBUG ("Got %s event, clearing buffer", GST_EVENT_TYPE_NAME (event));
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gst_adapter_clear (ofa->adapter);
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ofa->record = TRUE;
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g_free (ofa->fingerprint);
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ofa->fingerprint = NULL;
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break;
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case GST_EVENT_EOS:
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/* we got to the end of the stream but never generated a fingerprint
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* (probably under 135 seconds)
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*/
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if (!ofa->fingerprint)
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create_fingerprint (ofa);
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break;
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default:
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break;
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}
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return TRUE;
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}
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static void
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gst_ofa_init (GstOFA * ofa, GstOFAClass * g_class)
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{
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gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (ofa), TRUE);
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ofa->fingerprint = NULL;
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ofa->record = TRUE;
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ofa->adapter = gst_adapter_new ();
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}
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static GstFlowReturn
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gst_ofa_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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{
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GstOFA *ofa = GST_OFA (trans);
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guint64 nframes;
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GstClockTime duration;
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gint rate = GST_AUDIO_FILTER (ofa)->format.rate;
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gint channels = GST_AUDIO_FILTER (ofa)->format.channels;
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g_return_val_if_fail (rate > 0 && channels > 0, GST_FLOW_NOT_NEGOTIATED);
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if (!ofa->record)
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return GST_FLOW_OK;
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gst_adapter_push (ofa->adapter, gst_buffer_copy (buf));
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nframes = gst_adapter_available (ofa->adapter) / (channels * 2);
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duration = GST_FRAMES_TO_CLOCK_TIME (nframes, rate);
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if (duration >= 135 * GST_SECOND && ofa->fingerprint == NULL)
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create_fingerprint (ofa);
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return GST_FLOW_OK;
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}
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static void
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gst_ofa_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstOFA *ofa = GST_OFA (object);
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switch (prop_id) {
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case PROP_FINGERPRINT:
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g_value_set_string (value, ofa->fingerprint);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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gboolean ret;
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int major, minor, rev;
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GST_DEBUG_CATEGORY_INIT (gst_ofa_debug, "ofa", 0, "ofa element");
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ofa_get_version (&major, &minor, &rev);
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GST_DEBUG ("libofa %d.%d.%d", major, minor, rev);
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ret = gst_element_register (plugin, "ofa", GST_RANK_NONE, GST_TYPE_OFA);
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if (ret) {
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/* TODO: get this into core */
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gst_tag_register (GST_TAG_OFA_FINGERPRINT, GST_TAG_FLAG_META,
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G_TYPE_STRING, "ofa fingerprint", "OFA fingerprint", NULL);
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}
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return ret;
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"ofa",
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"Calculate MusicIP fingerprint from audio files",
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plugin_init, VERSION, "GPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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