gstreamer/gst/real/gstrealvideodec.c

/* RealVideo wrapper plugin
 *
 * Copyright (C) 2005 Lutz Mueller <lutz@topfrose.de>
 * Copyright (C) 2006 Edward Hervey <bilboed@bilboed.com>
 * 
 * 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.
 */

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

#include "gstreal.h"
#include "gstrealvideodec.h"

#include <string.h>

GST_DEBUG_CATEGORY_STATIC (realvideode_debug);
#define GST_CAT_DEFAULT realvideode_debug

static GstElementDetails realvideode_details =
GST_ELEMENT_DETAILS ("RealVideo decoder",
    "Codec/Decoder/Video", "Decoder for RealVideo streams",
    "Lutz Mueller <lutz@topfrose.de>");

static GstStaticPadTemplate snk_t =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-pn-realvideo, " "rmversion = (int) [ 2, 4 ]"));
static GstStaticPadTemplate src_t =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-raw-yuv, "
        "format = (fourcc) I420, "
        "framerate = (fraction) [0/1, MAX], "
        "width = (int) [ 16, 4096 ], " "height = (int) [ 16, 4096 ] "));

#define DEFAULT_RV20_NAMES "drv2.so:drv2.so.6.0"
#define DEFAULT_RV30_NAMES "drvc.so:drv3.so.6.0"
#define DEFAULT_RV40_NAMES "drvc.so:drv4.so.6.0"

enum
{
  PROP_0,
  PROP_REAL_CODECS_PATH,
  PROP_RV20_NAMES,
  PROP_RV30_NAMES,
  PROP_RV40_NAMES
};


GST_BOILERPLATE (GstRealVideoDec, gst_real_video_dec, GstElement,
    GST_TYPE_ELEMENT);

static gboolean open_library (GstRealVideoDec * dec,
    GstRealVideoDecHooks * hooks, GstRealVideoDecVersion version);
static void close_library (GstRealVideoDecHooks hooks);

typedef struct
{
  guint32 datalen;
  gint32 interpolate;
  gint32 nfragments;
  gpointer fragments;
  guint32 flags;
  guint32 timestamp;
} RVInData;

typedef struct
{
  guint32 frames;
  guint32 notes;
  guint32 timestamp;
  guint32 width;
  guint32 height;
} RVOutData;

static GstFlowReturn
gst_real_video_dec_chain (GstPad * pad, GstBuffer * in)
{
  GstRealVideoDec *dec;
  guint8 *data;
  guint size;
  GstFlowReturn ret;
  RVInData tin;
  RVOutData tout;
  GstClockTime timestamp, duration;
  GstBuffer *out;
  guint32 result;
  guint frag_count;

  dec = GST_REAL_VIDEO_DEC (GST_PAD_PARENT (pad));

  if (G_UNLIKELY (dec->hooks.transform == NULL || dec->hooks.module == NULL))
    goto not_negotiated;

  data = GST_BUFFER_DATA (in);
  size = GST_BUFFER_SIZE (in);
  timestamp = GST_BUFFER_TIMESTAMP (in);
  duration = GST_BUFFER_DURATION (in);

  /* alloc output buffer */
  ret = gst_pad_alloc_buffer (dec->src, GST_BUFFER_OFFSET_NONE,
      dec->width * dec->height * 3 / 2, GST_PAD_CAPS (dec->src), &out);
  if (ret != GST_FLOW_OK)
    goto alloc_failed;

  GST_BUFFER_TIMESTAMP (out) = timestamp;
  GST_BUFFER_DURATION (out) = duration;

  frag_count = *data++;

  /* Decode */
  tin.datalen = size;
  tin.interpolate = 0;
  tin.nfragments = frag_count;
  tin.fragments = data;
  tin.flags = 0;
  tin.timestamp = timestamp;

  /* jump over the frag table to the fragments */
  data += (frag_count + 1) * 8;

  result = dec->hooks.transform (
      (gchar *) data,
      (gchar *) GST_BUFFER_DATA (out), &tin, &tout, dec->hooks.context);
  if (result)
    goto could_not_transform;

  gst_buffer_unref (in);

  /* Check for new dimensions */
  if (tout.frames && ((dec->width != tout.width)
          || (dec->height != tout.height))) {
    GstCaps *caps = gst_caps_copy (GST_PAD_CAPS (dec->src));
    GstStructure *s = gst_caps_get_structure (caps, 0);

    GST_DEBUG_OBJECT (dec, "New dimensions: %"
        G_GUINT32_FORMAT " x %" G_GUINT32_FORMAT, tout.width, tout.height);

    gst_structure_set (s, "width", G_TYPE_LONG, tout.width,
        "height", G_TYPE_LONG, tout.height, NULL);

    gst_pad_set_caps (dec->src, caps);
    gst_buffer_set_caps (out, caps);
    gst_caps_unref (caps);

    dec->width = tout.width;
    dec->height = tout.height;
  }

  GST_DEBUG_OBJECT (dec,
      "Pushing out buffer with timestamp %" GST_TIME_FORMAT,
      GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (out)));

  if ((ret = gst_pad_push (dec->src, out)) != GST_FLOW_OK)
    goto could_not_push;

  return ret;

  /* Errors */
not_negotiated:
  {
    GST_WARNING_OBJECT (dec, "decoder not open, probably no input caps set "
        "yet, caps on input buffer: %" GST_PTR_FORMAT, GST_BUFFER_CAPS (in));
    gst_buffer_unref (in);
    return GST_FLOW_NOT_NEGOTIATED;
  }
alloc_failed:
  {
    GST_DEBUG_OBJECT (dec, "buffer alloc failed: %s", gst_flow_get_name (ret));
    gst_buffer_unref (in);
    return ret;
  }
could_not_transform:
  {
    gst_buffer_unref (out);
    gst_buffer_unref (in);
    GST_ELEMENT_ERROR (dec, STREAM, DECODE,
        ("Could not decode buffer: %" G_GUINT32_FORMAT, result), (NULL));
    return GST_FLOW_ERROR;
  }
could_not_push:
  {
    GST_DEBUG_OBJECT (dec, "Could not push buffer: %s",
        gst_flow_get_name (ret));
    return ret;
  }
}

static gboolean
gst_real_video_dec_activate_push (GstPad * pad, gboolean active)
{
  GstRealVideoDec *dec = GST_REAL_VIDEO_DEC (GST_PAD_PARENT (pad));

  gst_adapter_clear (dec->adapter);

  return TRUE;
}

static gboolean
gst_real_video_dec_setcaps (GstPad * pad, GstCaps * caps)
{
  GstRealVideoDec *dec = GST_REAL_VIDEO_DEC (GST_PAD_PARENT (pad));
  GstStructure *s = gst_caps_get_structure (caps, 0);
  gint version, res, width, height, format, subformat;
  gint framerate_num, framerate_denom;
  gchar data[36];
  gboolean bres;
  const GValue *v;
  GstRealVideoDecHooks hooks = { 0, 0, 0, 0, 0, 0 };

  if (!gst_structure_get_int (s, "rmversion", &version) ||
      !gst_structure_get_int (s, "width", (gint *) & width) ||
      !gst_structure_get_int (s, "height", (gint *) & height) ||
      !gst_structure_get_int (s, "format", &format) ||
      !gst_structure_get_int (s, "subformat", &subformat) ||
      !gst_structure_get_fraction (s, "framerate", &framerate_num,
          &framerate_denom))
    goto missing_keys;

  GST_LOG_OBJECT (dec, "Setting version to %d", version);

  if (!open_library (dec, &hooks, version))
    return FALSE;

  /* Initialize REAL driver. */
  GST_WRITE_UINT16_LE (data + 0, 11);
  GST_WRITE_UINT16_LE (data + 2, width);
  GST_WRITE_UINT16_LE (data + 4, height);
  GST_WRITE_UINT16_LE (data + 6, 0);
  GST_WRITE_UINT32_LE (data + 8, 0);
  GST_WRITE_UINT32_LE (data + 12, subformat);
  GST_WRITE_UINT32_LE (data + 16, 0);
  GST_WRITE_UINT32_LE (data + 20, format);
  res = hooks.init (&data, &hooks.context);
  if (res)
    goto could_not_initialize;

  if ((v = gst_structure_get_value (s, "codec_data"))) {
    GstBuffer *buf;
    guint32 *msgdata;
    guint i;
    struct
    {
      guint32 type;
      guint32 msg;
      gpointer data;
      guint32 extra[6];
    } msg;

    buf = g_value_peek_pointer (v);

    GST_LOG_OBJECT (dec, "Creating custom message of length %d",
        GST_BUFFER_SIZE (buf));

    msgdata = g_new0 (guint32, GST_BUFFER_SIZE (buf) + 2);
    if (!msgdata)
      goto could_not_allocate;

    msg.type = 0x24;
    msg.msg = 1 + ((subformat >> 16) & 7);
    msg.data = msgdata;
    for (i = 0; i < 6; i++)
      msg.extra[i] = 0;
    msgdata[0] = width;
    msgdata[1] = height;
    for (i = 0; i < GST_BUFFER_SIZE (buf); i++)
      msgdata[i + 2] = 4 * GST_BUFFER_DATA (buf)[i];

    res = hooks.custom_message (&msg, hooks.context);

    g_free (msgdata);
    if (res)
      goto could_not_send_message;
  }

  caps = gst_caps_new_simple ("video/x-raw-yuv",
      "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),
      "framerate", GST_TYPE_FRACTION, framerate_num, framerate_denom,
      "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL);
  bres = gst_pad_set_caps (GST_PAD (dec->src), caps);
  gst_caps_unref (caps);
  if (!bres)
    goto could_not_set_caps;

  close_library (dec->hooks);
  dec->hooks = hooks;
  dec->version = version;
  dec->width = width;
  dec->height = height;
  dec->format = format;
  dec->subformat = subformat;
  dec->framerate_num = framerate_num;
  dec->framerate_denom = framerate_denom;

  return TRUE;

missing_keys:
  {
    GST_DEBUG_OBJECT (dec, "Could not find all necessary keys in structure.");
    return FALSE;
  }

could_not_initialize:
  {
    close_library (hooks);
    GST_DEBUG_OBJECT (dec, "Initialization of REAL driver failed (%i).", res);
    return FALSE;
  }

could_not_allocate:
  {
    close_library (hooks);
    GST_DEBUG_OBJECT (dec, "Could not allocate memory.");
    return FALSE;
  }

could_not_send_message:
  {
    close_library (hooks);
    GST_DEBUG_OBJECT (dec, "Failed to send custom message needed for "
        "initialization (%i).", res);
    return FALSE;
  }

could_not_set_caps:
  {
    close_library (hooks);
    GST_DEBUG_OBJECT (dec, "Could not convince peer to accept dimensions "
        "%i x %i.", dec->width, dec->height);
    return FALSE;
  }
}

/* Attempts to open the correct library for the configured version */

static gboolean
open_library (GstRealVideoDec * dec, GstRealVideoDecHooks * hooks,
    GstRealVideoDecVersion version)
{
  gpointer rv_custom_msg, rv_free, rv_init, rv_transform;
  GModule *module = NULL;
  gchar *path, *names;
  gchar **split_names, **split_path;
  int i, j;

  GST_DEBUG_OBJECT (dec,
      "Attempting to open shared library for real video version %d", version);

  path = dec->real_codecs_path ? dec->real_codecs_path :
      DEFAULT_REAL_CODECS_PATH;

  switch (version) {
    case GST_REAL_VIDEO_DEC_VERSION_2:
      names = dec->rv20_names ? dec->rv20_names : DEFAULT_RV20_NAMES;
      break;
    case GST_REAL_VIDEO_DEC_VERSION_3:
      names = dec->rv30_names ? dec->rv30_names : DEFAULT_RV30_NAMES;
      break;
    case GST_REAL_VIDEO_DEC_VERSION_4:
      names = dec->rv40_names ? dec->rv40_names : DEFAULT_RV40_NAMES;
      break;
    default:
      goto unknown_version;
  }

  split_path = g_strsplit (path, ":", 0);
  split_names = g_strsplit (names, ":", 0);

  for (i = 0; split_path[i]; i++) {
    for (j = 0; split_names[j]; j++) {
      gchar *codec = g_strconcat (split_path[i], "/", split_names[j], NULL);

      module = g_module_open (codec, G_MODULE_BIND_LAZY);
      g_free (codec);
      if (module)
        goto codec_search_done;
    }
  }

codec_search_done:
  g_strfreev (split_path);
  g_strfreev (split_names);

  if (module == NULL)
    goto could_not_open;

  /* First try opening legacy symbols, if that fails try loading new symbols */
  if (g_module_symbol (module, "RV20toYUV420Init", &rv_init) &&
      g_module_symbol (module, "RV20toYUV420Free", &rv_free) &&
      g_module_symbol (module, "RV20toYUV420Transform", &rv_transform) &&
      g_module_symbol (module, "RV20toYUV420CustomMessage", &rv_custom_msg)) {
    GST_LOG_OBJECT (dec, "Loaded legacy symbols");
  } else if (g_module_symbol (module, "RV40toYUV420Init", &rv_init) &&
      g_module_symbol (module, "RV40toYUV420Free", &rv_free) &&
      g_module_symbol (module, "RV40toYUV420Transform", &rv_transform) &&
      g_module_symbol (module, "RV40toYUV420CustomMessage", &rv_custom_msg)) {
    GST_LOG_OBJECT (dec, "Loaded new symbols");
  } else {
    goto could_not_load;
  }

  hooks->init = rv_init;
  hooks->free = rv_free;
  hooks->transform = rv_transform;
  hooks->custom_message = rv_custom_msg;
  hooks->module = module;

  return TRUE;

unknown_version:
  {
    GST_ERROR_OBJECT (dec, "Cannot handle version %i.", version);
    return FALSE;
  }

could_not_open:
  {
    GST_ERROR_OBJECT (dec, "Could not open library '%s' in '%s': %s", names,
        path, g_module_error ());
    return FALSE;
  }

could_not_load:
  {
    close_library (*hooks);
    GST_ERROR_OBJECT (dec, "Could not load all symbols: %s", g_module_error ());
    return FALSE;
  }
}

static void
close_library (GstRealVideoDecHooks hooks)
{
  if (hooks.context && hooks.free)
    hooks.free (hooks.context);

  if (hooks.module) {
    g_module_close (hooks.module);
    hooks.module = NULL;
  }
}

static void
gst_real_video_dec_init (GstRealVideoDec * dec, GstRealVideoDecClass * klass)
{
  dec->snk = gst_pad_new_from_static_template (&snk_t, "sink");
  gst_pad_set_setcaps_function (dec->snk,
      GST_DEBUG_FUNCPTR (gst_real_video_dec_setcaps));
  gst_pad_set_chain_function (dec->snk,
      GST_DEBUG_FUNCPTR (gst_real_video_dec_chain));
  gst_pad_set_activatepush_function (dec->snk,
      GST_DEBUG_FUNCPTR (gst_real_video_dec_activate_push));
  gst_element_add_pad (GST_ELEMENT (dec), dec->snk);

  dec->src = gst_pad_new_from_static_template (&src_t, "src");
  gst_pad_use_fixed_caps (dec->src);
  gst_element_add_pad (GST_ELEMENT (dec), dec->src);

  dec->adapter = gst_adapter_new ();
}

static void
gst_real_video_dec_base_init (gpointer g_class)
{
  GstElementClass *ec = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&snk_t));
  gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&src_t));
  gst_element_class_set_details (ec, &realvideode_details);
}

static void
gst_real_video_dec_finalize (GObject * object)
{
  GstRealVideoDec *dec = GST_REAL_VIDEO_DEC (object);

  if (dec->adapter) {
    g_object_unref (G_OBJECT (dec->adapter));
    dec->adapter = NULL;
  }

  close_library (dec->hooks);
  memset (&dec->hooks, 0, sizeof (dec->hooks));

  if (dec->real_codecs_path) {
    g_free (dec->real_codecs_path);
    dec->real_codecs_path = NULL;
  }
  if (dec->rv20_names) {
    g_free (dec->rv20_names);
    dec->rv20_names = NULL;
  }
  if (dec->rv30_names) {
    g_free (dec->rv30_names);
    dec->rv30_names = NULL;
  }
  if (dec->rv40_names) {
    g_free (dec->rv40_names);
    dec->rv40_names = NULL;
  }

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
gst_real_video_dec_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstRealVideoDec *dec = GST_REAL_VIDEO_DEC (object);

  /* Changing the location of the .so supposes it's not being done
   * in a state greater than READY !
   */

  switch (prop_id) {
    case PROP_REAL_CODECS_PATH:
      if (dec->real_codecs_path)
        g_free (dec->real_codecs_path);
      dec->real_codecs_path = g_value_dup_string (value);
      break;
    case PROP_RV20_NAMES:
      if (dec->rv20_names)
        g_free (dec->rv20_names);
      dec->rv20_names = g_value_dup_string (value);
      break;
    case PROP_RV30_NAMES:
      if (dec->rv30_names)
        g_free (dec->rv30_names);
      dec->rv30_names = g_value_dup_string (value);
      break;
    case PROP_RV40_NAMES:
      if (dec->rv40_names)
        g_free (dec->rv40_names);
      dec->rv40_names = g_value_dup_string (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_real_video_dec_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstRealVideoDec *dec = GST_REAL_VIDEO_DEC (object);

  switch (prop_id) {
    case PROP_REAL_CODECS_PATH:
      g_value_set_string (value, dec->real_codecs_path ? dec->real_codecs_path
          : DEFAULT_REAL_CODECS_PATH);
      break;
    case PROP_RV20_NAMES:
      g_value_set_string (value, dec->rv20_names ? dec->rv20_names :
          DEFAULT_RV20_NAMES);
      break;
    case PROP_RV30_NAMES:
      g_value_set_string (value, dec->rv30_names ? dec->rv30_names :
          DEFAULT_RV30_NAMES);
      break;
    case PROP_RV40_NAMES:
      g_value_set_string (value, dec->rv40_names ? dec->rv40_names :
          DEFAULT_RV40_NAMES);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_real_video_dec_class_init (GstRealVideoDecClass * klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->set_property = gst_real_video_dec_set_property;
  object_class->get_property = gst_real_video_dec_get_property;
  object_class->finalize = gst_real_video_dec_finalize;

  g_object_class_install_property (object_class, PROP_REAL_CODECS_PATH,
      g_param_spec_string ("real_codecs_path",
          "Path where to search for RealPlayer codecs",
          "Path where to search for RealPlayer codecs",
          DEFAULT_REAL_CODECS_PATH, G_PARAM_READWRITE));
  g_object_class_install_property (object_class, PROP_RV20_NAMES,
      g_param_spec_string ("rv20_names", "Names of rv20 driver",
          "Names of rv20 driver", DEFAULT_RV20_NAMES, G_PARAM_READWRITE));
  g_object_class_install_property (object_class, PROP_RV30_NAMES,
      g_param_spec_string ("rv30_names", "Names of rv30 driver",
          "Names of rv30 driver", DEFAULT_RV30_NAMES, G_PARAM_READWRITE));
  g_object_class_install_property (object_class, PROP_RV40_NAMES,
      g_param_spec_string ("rv40_names", "Names of rv40 driver",
          "Names of rv40 driver", DEFAULT_RV40_NAMES, G_PARAM_READWRITE));

  GST_DEBUG_CATEGORY_INIT (realvideode_debug, "realvideodec", 0,
      "RealVideo decoder");
}