--- /dev/null
+/* GStreamer AccurateRip (TM) audio checksumming element
+ *
+ * Copyright (C) 2012 Christophe Fergeau <teuf@gnome.org>
+ *
+ * Based on the GStreamer chromaprint audio fingerprinting element
+ * Copyright (C) 2006 M. Derezynski
+ * Copyright (C) 2008 Eric Buehl
+ * Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org>
+ * Copyright (C) 2011 Lukáš Lalinský <lalinsky@gmail.com>
+ * Copyright (C) 2012 Collabora Ltd. <tim.muller@collabora.co.uk>
+ *
+ * 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.
+ */
+/*
+ * Based on the documentation from
+ * http://forum.dbpoweramp.com/showthread.php?20641-AccurateRip-CRC-Calculation
+ * and
+ * http://jonls.dk/2009/10/calculating-accuraterip-checksums/
+ */
+
+/**
+ * SECTION:element-accurip
+ *
+ * The accurip element calculates a CRC for an audio stream which can be used
+ * to match the audio stream to a database hosted on
+ * <ulink url="http://accuraterip.com/">AccurateRip</ulink>. This database
+ * is used to check for a CD rip accuracy.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch -m uridecodebin uri=file:///path/to/song.flac ! audioconvert ! accurip ! fakesink
+ * ]|
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "gstaccurip.h"
+
+#define DEFAULT_MAX_DURATION 120
+
+#define PAD_CAPS \
+ "audio/x-raw, " \
+ "format = (string) " GST_AUDIO_NE(S16) ", "\
+ "rate = (int) 44100, " \
+ "channels = (int) 2"
+
+GST_DEBUG_CATEGORY_STATIC (gst_accurip_debug);
+#define GST_CAT_DEFAULT gst_accurip_debug
+
+enum
+{
+ PROP_0,
+ PROP_FIRST_TRACK,
+ PROP_LAST_TRACK
+};
+
+#define parent_class gst_accurip_parent_class
+G_DEFINE_TYPE (GstAccurip, gst_accurip, GST_TYPE_AUDIO_FILTER);
+
+
+
+static void gst_accurip_finalize (GObject * object);
+static void gst_accurip_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec);
+static void gst_accurip_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec);
+static GstFlowReturn gst_accurip_transform_ip (GstBaseTransform * trans,
+ GstBuffer * buf);
+static gboolean gst_accurip_sink_event (GstBaseTransform * trans,
+ GstEvent * event);
+
+static void
+gst_accurip_class_init (GstAccuripClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstBaseTransformClass *gstbasetrans_class;
+ GstCaps *caps;
+
+ gobject_class = G_OBJECT_CLASS (klass);
+ gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
+
+ gobject_class->set_property = gst_accurip_set_property;
+ gobject_class->get_property = gst_accurip_get_property;
+
+ g_object_class_install_property (gobject_class, PROP_FIRST_TRACK,
+ g_param_spec_boolean ("first-track", "First track",
+ "Indicate to the CRC calculation algorithm that this is the first track of a set",
+ FALSE, G_PARAM_READWRITE));
+
+ g_object_class_install_property (gobject_class, PROP_LAST_TRACK,
+ g_param_spec_boolean ("last-track", "Last track",
+ "Indicate to the CRC calculation algorithm that this is the last track of a set",
+ FALSE, G_PARAM_READWRITE));
+
+ gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_accurip_finalize);
+
+ gstbasetrans_class->transform_ip =
+ GST_DEBUG_FUNCPTR (gst_accurip_transform_ip);
+ gstbasetrans_class->sink_event = GST_DEBUG_FUNCPTR (gst_accurip_sink_event);
+ gstbasetrans_class->passthrough_on_same_caps = TRUE;
+
+ gst_element_class_set_metadata (GST_ELEMENT_CLASS (klass),
+ "AccurateRip(TM) CRC element",
+ "Filter/Analyzer/Audio",
+ "Computes an AccurateRip CRC", "Christophe Fergeau <teuf@gnome.org>");
+
+ caps = gst_caps_from_string (PAD_CAPS);
+ gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (klass),
+ caps);
+ gst_caps_unref (caps);
+}
+
+static void
+ring_free (GstAccurip * accurip)
+{
+ g_free (accurip->crcs_ring);
+ g_free (accurip->crcs_v2_ring);
+ accurip->crcs_ring = NULL;
+ accurip->crcs_v2_ring = NULL;
+ accurip->ring_samples = 0;
+}
+
+static void
+gst_accurip_reset (GstAccurip * accurip)
+{
+ if (accurip->num_samples != 0) {
+ /* Don't reset these values on the NEW_SEGMENT event we get when
+ * the pipeline starts playing, they may have been set by the
+ * element user while creating the pipeline
+ */
+ accurip->is_first = FALSE;
+ accurip->is_last = FALSE;
+ ring_free (accurip);
+ }
+ accurip->crc = 0;
+ accurip->crc_v2 = 0;
+
+ accurip->num_samples = 0;
+}
+
+/* We must ignore the first and last 5 CD sectors. A CD sector is worth
+ * 2352 bytes of audio */
+#define IGNORED_SAMPLES_COUNT (2352 * 5 / (2*2))
+
+static void
+gst_accurip_emit_tags (GstAccurip * accurip)
+{
+ GstTagList *tags;
+
+ if (accurip->num_samples == 0)
+ return;
+
+ if (accurip->is_last) {
+ guint index;
+ if (accurip->ring_samples <= IGNORED_SAMPLES_COUNT) {
+ return;
+ }
+ index = accurip->ring_samples - IGNORED_SAMPLES_COUNT;
+ index %= (IGNORED_SAMPLES_COUNT + 1);
+ accurip->crc = accurip->crcs_ring[index];
+ accurip->crc_v2 = accurip->crcs_v2_ring[index];
+ }
+
+ GST_DEBUG_OBJECT (accurip,
+ "Generating CRC based on %" G_GUINT64_FORMAT " samples",
+ accurip->num_samples);
+
+ tags = gst_tag_list_new (GST_TAG_ACCURIP_CRC, accurip->crc,
+ GST_TAG_ACCURIP_CRC_V2, accurip->crc_v2, NULL);
+
+ GST_DEBUG_OBJECT (accurip, "Computed CRC=%08X and CRCv2=0x%08X \n",
+ accurip->crc, accurip->crc_v2);
+
+ gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (accurip),
+ gst_event_new_tag (tags));
+}
+
+static void
+gst_accurip_init (GstAccurip * accurip)
+{
+ gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (accurip), TRUE);
+}
+
+static void
+gst_accurip_finalize (GObject * object)
+{
+ ring_free (GST_ACCURIP (object));
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static GstFlowReturn
+gst_accurip_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
+{
+ GstAccurip *accurip = GST_ACCURIP (trans);
+ GstAudioFilter *filter = GST_AUDIO_FILTER (trans);
+ guint32 *data;
+ GstMapInfo map_info;
+ guint nsamples;
+ gint channels;
+ guint i;
+
+ channels = GST_AUDIO_INFO_CHANNELS (&filter->info);
+
+ if (G_UNLIKELY (channels != 2))
+ return GST_FLOW_NOT_NEGOTIATED;
+
+ if (!gst_buffer_map (buf, &map_info, GST_MAP_READ))
+ return GST_FLOW_ERROR;
+
+ data = (guint32 *) map_info.data;
+ nsamples = map_info.size / (channels * 2);
+
+ for (i = 0; i < nsamples; i++) {
+ guint64 mult_sample;
+
+ /* the AccurateRip algorithm counts samples starting from 1 instead
+ * of 0, that's why we start by incrementing the number of samples
+ * before doing the calculations
+ */
+ accurip->num_samples++;
+
+ /* On the first track, we have to ignore the first 5 CD sectors of
+ * audio data
+ */
+ if (accurip->is_first && accurip->num_samples < IGNORED_SAMPLES_COUNT)
+ continue;
+
+ /* Actual CRC computation is here */
+ mult_sample = data[i] * accurip->num_samples;
+ accurip->crc += mult_sample;
+ accurip->crc_v2 += mult_sample & 0xffffffff;
+ accurip->crc_v2 += (mult_sample >> 32);
+
+ /* On the last track, we've got to ignore the last 5 CD sectors of
+ * audio data, since we cannot know in advance when the last buffer
+ * will be, we keep 5 CD sectors samples + 1 in memory so that we
+ * can rollback to the 'good' value when we reach the end of stream.
+ * This magic is only needed when the 'track-last' property is set.
+ */
+ if (accurip->is_last) {
+ guint index = accurip->ring_samples % (IGNORED_SAMPLES_COUNT + 1);
+ accurip->ring_samples++;
+ accurip->crcs_ring[index] = accurip->crc;
+ accurip->crcs_v2_ring[index] = accurip->crc_v2;
+ }
+ }
+
+ gst_buffer_unmap (buf, &map_info);
+
+ return GST_FLOW_OK;
+}
+
+static gboolean
+gst_accurip_sink_event (GstBaseTransform * trans, GstEvent * event)
+{
+ GstAccurip *accurip = GST_ACCURIP (trans);
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_FLUSH_STOP:
+ case GST_EVENT_SEGMENT:
+ GST_DEBUG_OBJECT (trans, "Got %s event, clearing buffer",
+ GST_EVENT_TYPE_NAME (event));
+ gst_accurip_emit_tags (accurip);
+ gst_accurip_reset (accurip);
+ break;
+ case GST_EVENT_EOS:
+ gst_accurip_emit_tags (accurip);
+ break;
+ default:
+ break;
+ }
+
+ return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
+}
+
+static void
+gst_accurip_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstAccurip *accurip = GST_ACCURIP (object);
+
+ switch (prop_id) {
+ case PROP_FIRST_TRACK:
+ accurip->is_first = g_value_get_boolean (value);
+ break;
+ case PROP_LAST_TRACK:
+ if (accurip->is_last != g_value_get_boolean (value)) {
+ ring_free (accurip);
+ }
+ accurip->is_last = g_value_get_boolean (value);
+ if (accurip->is_last) {
+ if (accurip->crcs_ring == NULL) {
+ accurip->crcs_ring = g_new0 (guint32, IGNORED_SAMPLES_COUNT + 1);
+ }
+ if (accurip->crcs_v2_ring == NULL) {
+ accurip->crcs_v2_ring = g_new0 (guint32, IGNORED_SAMPLES_COUNT + 1);
+ }
+ }
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gst_accurip_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstAccurip *accurip = GST_ACCURIP (object);
+
+ switch (prop_id) {
+ case PROP_FIRST_TRACK:
+ g_value_set_boolean (value, accurip->is_first);
+ break;
+ case PROP_LAST_TRACK:
+ g_value_set_boolean (value, accurip->is_last);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+ gboolean ret;
+
+ GST_DEBUG_CATEGORY_INIT (gst_accurip_debug, "accurip", 0, "accurip element");
+
+ ret = gst_element_register (plugin, "accurip", GST_RANK_NONE,
+ GST_TYPE_ACCURIP);
+
+ if (ret) {
+ gst_tag_register (GST_TAG_ACCURIP_CRC, GST_TAG_FLAG_META,
+ G_TYPE_UINT, "accurip crc", "AccurateRip(TM) CRC", NULL);
+ gst_tag_register (GST_TAG_ACCURIP_CRC_V2, GST_TAG_FLAG_META,
+ G_TYPE_UINT, "accurip crc (v2)", "AccurateRip(TM) CRC (version 2)",
+ NULL);
+ }
+
+ return ret;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ accurip,
+ "Computes an AccurateRip CRC",
+ plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
--- /dev/null
+/* GStreamer AccurateRip (TM) audio checksumming element
+ *
+ * Copyright (C) 2012 Christophe Fergeau <teuf@gnome.org>
+ *
+ * Based on the GStreamer chromaprint audio fingerprinting element
+ * Copyright (C) 2006 M. Derezynski
+ * Copyright (C) 2008 Eric Buehl
+ * Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org>
+ * Copyright (C) 2011 Lukáš Lalinský <<user@hostname.org>>
+ *
+ * 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.
+ */
+
+#ifndef __GST_ACCURIP_H__
+#define __GST_ACCURIP_H__
+
+#include <gst/gst.h>
+#include <gst/base/gstadapter.h>
+#include <gst/audio/gstaudiofilter.h>
+#include <gst/audio/audio.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_ACCURIP \
+ (gst_accurip_get_type())
+#define GST_ACCURIP(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ACCURIP,GstAccurip))
+#define GST_ACCURIP_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ACCURIP,GstAccuripClass))
+#define GST_IS_ACCURIP(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ACCURIP))
+#define GST_IS_ACCURIP_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ACCURIP))
+
+#define GST_TAG_ACCURIP_CRC "accurip-crc"
+#define GST_TAG_ACCURIP_CRC_V2 "accurip-crcv2"
+
+typedef struct _GstAccurip GstAccurip;
+typedef struct _GstAccuripClass GstAccuripClass;
+
+/**
+ * GstAccurip:
+ *
+ * Opaque #GstAccurip element structure
+ */
+struct _GstAccurip
+{
+ GstAudioFilter element;
+
+ /*< private >*/
+ guint32 crc;
+ guint32 crc_v2;
+ guint64 num_samples;
+ gboolean is_first;
+ gboolean is_last;
+
+ /* Needed when 'is_last' is true */
+ guint32 *crcs_ring;
+ guint32 *crcs_v2_ring;
+ guint64 ring_samples;
+};
+
+struct _GstAccuripClass
+{
+ GstAudioFilterClass parent_class;
+};
+
+GType gst_accurip_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_ACCURIP_H__ */
projects / platform / upstream / gstreamer.git / commitdiff