/*
 * GStreamer
 * Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
 * Copyright (C) 2006 Sebastian Dröge <slomo@circular-chaos.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., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

/**
 * SECTION:element-audiopanorama
 *
 * Stereo panorama effect with controllable pan position. One can choose between the default psychoacoustic panning method,
 * which keeps the same perceived loudness, and a simple panning method that just controls the volume on one channel.
 *
 * <refsect2>
 * <title>Example launch line</title>
 * |[
 * gst-launch-1.0 audiotestsrc wave=saw ! audiopanorama panorama=-1.00 ! alsasink
 * gst-launch-1.0 filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiopanorama panorama=-1.00 ! alsasink
 * gst-launch-1.0 audiotestsrc wave=saw ! audioconvert ! audiopanorama panorama=-1.00 ! audioconvert ! alsasink
 * gst-launch-1.0 audiotestsrc wave=saw ! audioconvert ! audiopanorama method=simple panorama=-0.50 ! audioconvert ! alsasink
 * ]|
 * </refsect2>
 */

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

#include <string.h>

#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>

#ifdef HAVE_ORC
#include <orc/orcfunctions.h>
#else
#define orc_memset memset
#endif

#include "audiopanorama.h"
#include "audiopanoramaorc.h"

#define GST_CAT_DEFAULT gst_audio_panorama_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);

/* Filter signals and args */
enum
{
  PROP_0,
  PROP_PANORAMA,
  PROP_METHOD
};

#define GST_TYPE_AUDIO_PANORAMA_METHOD (gst_audio_panorama_method_get_type ())
static GType
gst_audio_panorama_method_get_type (void)
{
  static GType gtype = 0;

  if (gtype == 0) {
    static const GEnumValue values[] = {
      {METHOD_PSYCHOACOUSTIC, "Psychoacoustic Panning (default)",
          "psychoacoustic"},
      {METHOD_SIMPLE, "Simple Panning", "simple"},
      {0, NULL, NULL}
    };

    gtype = g_enum_register_static ("GstAudioPanoramaMethod", values);
  }
  return gtype;
}

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-raw, "
        "format = (string) { " GST_AUDIO_NE (F32) ", " GST_AUDIO_NE (S16) "}, "
        "rate = (int) [ 1, MAX ], " "channels = (int) [ 1, 2 ], "
        "layout = (string) interleaved")
    );

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 (F32) ", " GST_AUDIO_NE (S16) "}, "
        "rate = (int) [ 1, MAX ], " "channels = (int) 2, "
        "layout = (string) interleaved")
    );

G_DEFINE_TYPE (GstAudioPanorama, gst_audio_panorama, GST_TYPE_BASE_TRANSFORM);

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

static gboolean gst_audio_panorama_get_unit_size (GstBaseTransform * base,
    GstCaps * caps, gsize * size);
static GstCaps *gst_audio_panorama_transform_caps (GstBaseTransform * base,
    GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static gboolean gst_audio_panorama_set_caps (GstBaseTransform * base,
    GstCaps * incaps, GstCaps * outcaps);

static void gst_audio_panorama_m2s_int (gfloat pan,
    gint16 * idata, gint16 * odata, guint num_samples);
static void gst_audio_panorama_s2s_int (gfloat pan,
    gint16 * idata, gint16 * odata, guint num_samples);
static void gst_audio_panorama_m2s_float (gfloat pan,
    gfloat * idata, gfloat * odata, guint num_samples);
static void gst_audio_panorama_s2s_float (gfloat pan,
    gfloat * idata, gfloat * odata, guint num_samples);

static void gst_audio_panorama_m2s_int_simple (gfloat pan,
    gint16 * idata, gint16 * odata, guint num_samples);
static void gst_audio_panorama_s2s_int_simple (gfloat pan,
    gint16 * idata, gint16 * odata, guint num_samples);
static void gst_audio_panorama_m2s_float_simple (gfloat pan,
    gfloat * idata, gfloat * odata, guint num_samples);
static void gst_audio_panorama_s2s_float_simple (gfloat pan,
    gfloat * idata, gfloat * odata, guint num_samples);

static GstFlowReturn gst_audio_panorama_transform (GstBaseTransform * base,
    GstBuffer * inbuf, GstBuffer * outbuf);


/* Table with processing functions: [channels][format][method] */
static GstAudioPanoramaProcessFunc panorama_process_functions[2][2][2] = {
  {
        {
              (GstAudioPanoramaProcessFunc) gst_audio_panorama_m2s_int,
            (GstAudioPanoramaProcessFunc) gst_audio_panorama_m2s_int_simple},
        {
              (GstAudioPanoramaProcessFunc) gst_audio_panorama_m2s_float,
            (GstAudioPanoramaProcessFunc) gst_audio_panorama_m2s_float_simple}
      },
  {
        {
              (GstAudioPanoramaProcessFunc) gst_audio_panorama_s2s_int,
            (GstAudioPanoramaProcessFunc) gst_audio_panorama_s2s_int_simple},
        {
              (GstAudioPanoramaProcessFunc) gst_audio_panorama_s2s_float,
            (GstAudioPanoramaProcessFunc) gst_audio_panorama_s2s_float_simple}
      }
};

/* GObject vmethod implementations */

static void
gst_audio_panorama_class_init (GstAudioPanoramaClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  GST_DEBUG_CATEGORY_INIT (gst_audio_panorama_debug, "audiopanorama", 0,
      "audiopanorama element");

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  gobject_class->set_property = gst_audio_panorama_set_property;
  gobject_class->get_property = gst_audio_panorama_get_property;

  g_object_class_install_property (gobject_class, PROP_PANORAMA,
      g_param_spec_float ("panorama", "Panorama",
          "Position in stereo panorama (-1.0 left -> 1.0 right)", -1.0, 1.0,
          0.0,
          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
  /**
   * GstAudioPanorama:method:
   *
   * Panning method: psychoacoustic mode keeps the same perceived loudness,
   * while simple mode just controls the volume of one channel. It's merely
   * a matter of taste which method should be chosen. 
   */
  g_object_class_install_property (gobject_class, PROP_METHOD,
      g_param_spec_enum ("method", "Panning method",
          "Psychoacoustic mode keeps same perceived loudness, "
          "simple mode just controls volume of one channel.",
          GST_TYPE_AUDIO_PANORAMA_METHOD, METHOD_PSYCHOACOUSTIC,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gst_element_class_set_static_metadata (gstelement_class, "Stereo positioning",
      "Filter/Effect/Audio",
      "Positions audio streams in the stereo panorama",
      "Stefan Kost <ensonic@users.sf.net>");

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&src_template));
  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&sink_template));

  GST_BASE_TRANSFORM_CLASS (klass)->get_unit_size =
      GST_DEBUG_FUNCPTR (gst_audio_panorama_get_unit_size);
  GST_BASE_TRANSFORM_CLASS (klass)->transform_caps =
      GST_DEBUG_FUNCPTR (gst_audio_panorama_transform_caps);
  GST_BASE_TRANSFORM_CLASS (klass)->set_caps =
      GST_DEBUG_FUNCPTR (gst_audio_panorama_set_caps);
  GST_BASE_TRANSFORM_CLASS (klass)->transform =
      GST_DEBUG_FUNCPTR (gst_audio_panorama_transform);
}

static void
gst_audio_panorama_init (GstAudioPanorama * filter)
{

  filter->panorama = 0;
  filter->method = METHOD_PSYCHOACOUSTIC;
  gst_audio_info_init (&filter->info);
  filter->process = NULL;

  gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (filter), TRUE);
}

static gboolean
gst_audio_panorama_set_process_function (GstAudioPanorama * filter,
    GstAudioInfo * info)
{
  gint channel_index, format_index, method_index;
  const GstAudioFormatInfo *finfo = info->finfo;

  /* set processing function */
  channel_index = GST_AUDIO_INFO_CHANNELS (info) - 1;
  if (channel_index > 1 || channel_index < 0) {
    filter->process = NULL;
    return FALSE;
  }

  format_index = GST_AUDIO_FORMAT_INFO_IS_FLOAT (finfo) ? 1 : 0;
  method_index = filter->method;

  filter->process =
      panorama_process_functions[channel_index][format_index][method_index];
  return TRUE;
}

static void
gst_audio_panorama_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (object);

  switch (prop_id) {
    case PROP_PANORAMA:
      filter->panorama = g_value_get_float (value);
      break;
    case PROP_METHOD:
      filter->method = g_value_get_enum (value);
      gst_audio_panorama_set_process_function (filter, &filter->info);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_audio_panorama_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (object);

  switch (prop_id) {
    case PROP_PANORAMA:
      g_value_set_float (value, filter->panorama);
      break;
    case PROP_METHOD:
      g_value_set_enum (value, filter->method);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

/* GstBaseTransform vmethod implementations */

static gboolean
gst_audio_panorama_get_unit_size (GstBaseTransform * base, GstCaps * caps,
    gsize * size)
{
  GstAudioInfo info;

  g_assert (size);

  if (!gst_audio_info_from_caps (&info, caps))
    return FALSE;

  *size = GST_AUDIO_INFO_BPF (&info);

  return TRUE;
}

static GstCaps *
gst_audio_panorama_transform_caps (GstBaseTransform * base,
    GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
  GstCaps *res;
  GstStructure *structure;
  gint i;

  /* replace the channel property with our range. */
  res = gst_caps_copy (caps);
  for (i = 0; i < gst_caps_get_size (res); i++) {
    structure = gst_caps_get_structure (res, i);
    if (direction == GST_PAD_SRC) {
      GST_INFO_OBJECT (base, "[%d] allow 1-2 channels", i);
      gst_structure_set (structure, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
    } else {
      GST_INFO_OBJECT (base, "[%d] allow 2 channels", i);
      gst_structure_set (structure, "channels", G_TYPE_INT, 2, NULL);
    }
    gst_structure_remove_field (structure, "channel-mask");
  }
  GST_DEBUG_OBJECT (base, "transformed %" GST_PTR_FORMAT, res);

  if (filter) {
    GstCaps *intersection;

    GST_DEBUG_OBJECT (base, "Using filter caps %" GST_PTR_FORMAT, filter);
    intersection =
        gst_caps_intersect_full (filter, res, GST_CAPS_INTERSECT_FIRST);
    gst_caps_unref (res);
    res = intersection;
    GST_DEBUG_OBJECT (base, "Intersection %" GST_PTR_FORMAT, res);
  }

  return res;
}

static gboolean
gst_audio_panorama_set_caps (GstBaseTransform * base, GstCaps * incaps,
    GstCaps * outcaps)
{
  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (base);
  GstAudioInfo info;

  /*GST_INFO ("incaps are %" GST_PTR_FORMAT, incaps); */
  if (!gst_audio_info_from_caps (&info, incaps))
    goto no_format;

  GST_DEBUG ("try to process %d input with %d channels",
      GST_AUDIO_INFO_FORMAT (&info), GST_AUDIO_INFO_CHANNELS (&info));

  if (!gst_audio_panorama_set_process_function (filter, &info))
    goto no_format;

  filter->info = info;

  return TRUE;

no_format:
  {
    GST_DEBUG ("invalid caps");
    return FALSE;
  }
}

/* psychoacoustic processing functions */

/* mono to stereo panning
 * pan: -1.0  0.0  1.0
 * l:    1.0  0.5  0.0  
 * r:    0.0  0.5  1.0
 *
 * FIXME: we should use -3db (1/sqtr(2)) for 50:50
 */
static void
gst_audio_panorama_m2s_int (gfloat pan, gint16 * idata, gint16 * odata, guint n)
{
  gfloat r = (pan + 1.0) / 2.0;
  audiopanoramam_orc_process_s16_ch1_psy (odata, idata, 1.0 - r, r, n);
}

static void
gst_audio_panorama_m2s_float (gfloat pan, gfloat * idata,
    gfloat * odata, guint n)
{
  gfloat r = (pan + 1.0) / 2.0;
  audiopanoramam_orc_process_f32_ch1_psy (odata, idata, 1.0 - r, r, n);
}

/* stereo balance
 * pan: -1.0  0.0  1.0
 * ll:   1.0  1.0  0.0
 * lr:   1.0  0.0  0.0
 * rr:   0.0  1.0  1.0
 * rl:   0.0  0.0  1.0
 */
static void
gst_audio_panorama_s2s_int (gfloat pan, gint16 * idata, gint16 * odata, guint n)
{
  if (pan == 0.0) {
    audiopanoramam_orc_process_s16_ch2_none (odata, idata, n);
  } else if (pan > 0.0) {
    gfloat rl = pan;
    gfloat ll = 1.0 - rl;
    audiopanoramam_orc_process_s16_ch2_psy_right (odata, idata, ll, rl, n);
  } else {
    gfloat rr = 1.0 + pan;
    gfloat lr = 1.0 - rr;
    audiopanoramam_orc_process_s16_ch2_psy_left (odata, idata, lr, rr, n);
  }
}

static void
gst_audio_panorama_s2s_float (gfloat pan, gfloat * idata,
    gfloat * odata, guint n)
{
  if (pan == 0.0) {
    audiopanoramam_orc_process_f32_ch2_none (odata, idata, n);
  } else if (pan > 0.0) {
    gfloat rl = pan;
    gfloat ll = 1.0 - rl;
    audiopanoramam_orc_process_f32_ch2_psy_right (odata, idata, ll, rl, n);
  } else {
    gfloat rr = 1.0 + pan;
    gfloat lr = 1.0 - rr;
    audiopanoramam_orc_process_f32_ch2_psy_left (odata, idata, lr, rr, n);
  }
}

/* simple processing functions */

static void
gst_audio_panorama_m2s_int_simple (gfloat pan, gint16 * idata,
    gint16 * odata, guint n)
{
  if (pan == 0.0) {
    audiopanoramam_orc_process_s16_ch1_none (odata, idata, n);
  } else if (pan > 0.0) {
    gfloat lpan = 1.0 - pan;
    audiopanoramam_orc_process_s16_ch1_sim_left (odata, idata, lpan, n);
  } else {
    gfloat rpan = 1.0 + pan;
    audiopanoramam_orc_process_s16_ch1_sim_right (odata, idata, rpan, n);
  }
}

static void
gst_audio_panorama_s2s_int_simple (gfloat pan, gint16 * idata,
    gint16 * odata, guint n)
{
  if (pan == 0.0) {
    audiopanoramam_orc_process_s16_ch2_none (odata, idata, n);
  } else if (pan > 0.0) {
    gfloat lpan = 1.0 - pan;
    audiopanoramam_orc_process_s16_ch2_sim_left (odata, idata, lpan, n);
  } else {
    gfloat rpan = 1.0 + pan;
    audiopanoramam_orc_process_s16_ch2_sim_right (odata, idata, rpan, n);
  }
}

static void
gst_audio_panorama_m2s_float_simple (gfloat pan, gfloat * idata,
    gfloat * odata, guint n)
{
  if (pan == 0.0) {
    audiopanoramam_orc_process_f32_ch1_none (odata, idata, n);
  } else if (pan > 0.0) {
    gfloat lpan = 1.0 - pan;
    audiopanoramam_orc_process_f32_ch1_sim_left (odata, idata, lpan, n);
  } else {
    gfloat rpan = 1.0 + pan;
    audiopanoramam_orc_process_f32_ch1_sim_right (odata, idata, rpan, n);
  }
}

static void
gst_audio_panorama_s2s_float_simple (gfloat pan, gfloat * idata,
    gfloat * odata, guint n)
{
  if (pan == 0.0) {
    audiopanoramam_orc_process_f32_ch2_none (odata, idata, n);
  } else if (pan > 0.0) {
    gfloat lpan = 1.0 - pan;
    audiopanoramam_orc_process_f32_ch2_sim_left (odata, idata, lpan, n);
  } else {
    gfloat rpan = 1.0 + pan;
    audiopanoramam_orc_process_f32_ch2_sim_right (odata, idata, rpan, n);
  }
}

/* this function does the actual processing
 */
static GstFlowReturn
gst_audio_panorama_transform (GstBaseTransform * base, GstBuffer * inbuf,
    GstBuffer * outbuf)
{
  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (base);
  GstClockTime ts;
  GstMapInfo inmap, outmap;

  ts = gst_segment_to_stream_time (&base->segment, GST_FORMAT_TIME,
      GST_BUFFER_TIMESTAMP (inbuf));

  if (GST_CLOCK_TIME_IS_VALID (ts)) {
    GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
    gst_object_sync_values (GST_OBJECT (filter), ts);
  }

  gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE);

  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP))) {
    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);
    orc_memset (outmap.data, 0, outmap.size);
  } else {
    /* output is always stereo, input is mono or stereo,
     * and info describes input format */
    guint num_samples = outmap.size / (2 * GST_AUDIO_INFO_BPS (&filter->info));

    gst_buffer_map (inbuf, &inmap, GST_MAP_READ);
    filter->process (filter->panorama, inmap.data, outmap.data, num_samples);
    gst_buffer_unmap (inbuf, &inmap);
  }

  gst_buffer_unmap (outbuf, &outmap);

  return GST_FLOW_OK;
}
