gstreamer/ext/audiofile/gstafsrc.c

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *
 * gstafsrc.c: 
 *
 * 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 "gst/gst-i18n-plugin.h"
#include <gst/gst.h>
#include <gst/audio/audio.h>
#include <string.h>
#include <errno.h>

#include "gstafsrc.h"

/* elementfactory information */
static GstElementDetails afsrc_details = {
  "Audiofile Src",
  "Source/Audio",
  "Read audio files from disk using libaudiofile",
  "Thomas <thomas@apestaart.org>",
};


/* AFSrc signals and args */
enum
{
  /* FILL ME */
  SIGNAL_HANDOFF,
  LAST_SIGNAL
};

enum
{
  ARG_0,
  ARG_LOCATION
};

/* added a src factory function to force audio/raw MIME type */
/* I think the caps can be broader, we need to change that somehow */
static GstStaticPadTemplate afsrc_src_factory = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-raw-int, "
        "rate = (int) [ 1, MAX ], "
        "channels = (int) [ 1, MAX ], "
        "endianness = (int) BYTE_ORDER, "
        "width = (int) { 8, 16 }, "
        "depth = (int) { 8, 16 }, " "signed = (boolean) { true, false }")
    );

/* we use an enum for the output type arg */

#define GST_TYPE_AFSRC_TYPES (gst_afsrc_types_get_type())

/* FIXME: fix the string ints to be string-converted from the audiofile.h types */
/* defined but not used
static GType
gst_afsrc_types_get_type (void) 
{
  static GType afsrc_types_type = 0;
  static GEnumValue afsrc_types[] = {
    {AF_FILE_RAWDATA, "0", "raw PCM"},
    {AF_FILE_AIFFC,   "1", "AIFFC"},
    {AF_FILE_AIFF,    "2", "AIFF"},
    {AF_FILE_NEXTSND, "3", "Next/SND"},
    {AF_FILE_WAVE,    "4", "Wave"},
    {0, NULL, NULL},
  };
  
  if (!afsrc_types_type) 
  {
    afsrc_types_type = g_enum_register_static ("GstAudiosrcTypes", afsrc_types);
  }
  return afsrc_types_type;
}
*/
static void gst_afsrc_base_init (gpointer g_class);
static void gst_afsrc_class_init (GstAFSrcClass * klass);
static void gst_afsrc_init (GstAFSrc * afsrc);

static gboolean gst_afsrc_open_file (GstAFSrc * src);
static void gst_afsrc_close_file (GstAFSrc * src);

static GstData *gst_afsrc_get (GstPad * pad);

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

static GstStateChangeReturn gst_afsrc_change_state (GstElement * element,
    GstStateChange transition);

static GstElementClass *parent_class = NULL;
static guint gst_afsrc_signals[LAST_SIGNAL] = { 0 };

GType
gst_afsrc_get_type (void)
{
  static GType afsrc_type = 0;

  if (!afsrc_type) {
    static const GTypeInfo afsrc_info = {
      sizeof (GstAFSrcClass),
      gst_afsrc_base_init,
      NULL,
      (GClassInitFunc) gst_afsrc_class_init,
      NULL,
      NULL,
      sizeof (GstAFSrc),
      0,
      (GInstanceInitFunc) gst_afsrc_init,
    };

    afsrc_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstAFSrc", &afsrc_info, 0);
  }
  return afsrc_type;
}

static void
gst_afsrc_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&afsrc_src_factory));
  gst_element_class_set_details (element_class, &afsrc_details);
}

static void
gst_afsrc_class_init (GstAFSrcClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gst_element_class_install_std_props (GST_ELEMENT_CLASS (klass),
      "location", ARG_LOCATION, G_PARAM_READWRITE, NULL);

  gst_afsrc_signals[SIGNAL_HANDOFF] =
      g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
      G_STRUCT_OFFSET (GstAFSrcClass, handoff), NULL, NULL,
      g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);


  gobject_class->set_property = gst_afsrc_set_property;
  gobject_class->get_property = gst_afsrc_get_property;

  gstelement_class->change_state = gst_afsrc_change_state;
}

static void
gst_afsrc_init (GstAFSrc * afsrc)
{
  /* no need for a template, caps are set based on file, right ? */
  afsrc->srcpad =
      gst_pad_new_from_template (gst_element_get_pad_template (GST_ELEMENT
          (afsrc), "src"), "src");
  gst_element_add_pad (GST_ELEMENT (afsrc), afsrc->srcpad);
  gst_pad_use_explicit_caps (afsrc->srcpad);
  gst_pad_set_get_function (afsrc->srcpad, gst_afsrc_get);

  afsrc->bytes_per_read = 4096;
  afsrc->curoffset = 0;
  afsrc->seq = 0;

  afsrc->filename = NULL;
  afsrc->file = NULL;
  /* default values, should never be needed */
  afsrc->channels = 2;
  afsrc->width = 16;
  afsrc->rate = 44100;
  afsrc->type = AF_FILE_WAVE;
  afsrc->endianness_data = 1234;
  afsrc->endianness_wanted = 1234;
  afsrc->framestamp = 0;
}

static GstData *
gst_afsrc_get (GstPad * pad)
{
  GstAFSrc *src;
  GstBuffer *buf;

  glong readbytes, readframes;
  glong frameCount;

  g_return_val_if_fail (pad != NULL, NULL);
  src = GST_AFSRC (gst_pad_get_parent (pad));

  buf = gst_buffer_new ();
  g_return_val_if_fail (buf, NULL);

  GST_BUFFER_DATA (buf) = (gpointer) g_malloc (src->bytes_per_read);

  /* calculate frameCount to read based on file info */

  frameCount = src->bytes_per_read / (src->channels * src->width / 8);
/*  g_print ("DEBUG: gstafsrc: going to read %ld frames\n", frameCount); */
  readframes = afReadFrames (src->file, AF_DEFAULT_TRACK, GST_BUFFER_DATA (buf),
      frameCount);
  readbytes = readframes * (src->channels * src->width / 8);
  if (readbytes == 0) {
    gst_element_set_eos (GST_ELEMENT (src));
    return GST_DATA (gst_event_new (GST_EVENT_EOS));
  }

  GST_BUFFER_SIZE (buf) = readbytes;
  GST_BUFFER_OFFSET (buf) = src->curoffset;

  src->curoffset += readbytes;

  src->framestamp += gst_audio_frame_length (src->srcpad, buf);
  GST_BUFFER_TIMESTAMP (buf) = src->framestamp * 1E9
      / gst_audio_frame_rate (src->srcpad);
  /* printf ("DEBUG: afsrc: timestamp set on output buffer: %f sec\n", 
     GST_BUFFER_TIMESTAMP (buf) / 1E9); */

/*  g_print("DEBUG: gstafsrc: pushed buffer of %ld bytes\n", readbytes); */
  return GST_DATA (buf);
}

static void
gst_afsrc_set_property (GObject * object, guint prop_id, const GValue * value,
    GParamSpec * pspec)
{
  GstAFSrc *src;

  src = GST_AFSRC (object);

  switch (prop_id) {
    case ARG_LOCATION:
      if (src->filename)
        g_free (src->filename);
      src->filename = g_strdup (g_value_get_string (value));
      break;
    default:
      break;
  }
}

static void
gst_afsrc_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstAFSrc *src;

  g_return_if_fail (GST_IS_AFSRC (object));

  src = GST_AFSRC (object);

  switch (prop_id) {
    case ARG_LOCATION:
      g_value_set_string (value, src->filename);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

gboolean
gst_afsrc_plugin_init (GstPlugin * plugin)
{
  /* load audio support library */
  if (!gst_library_load ("gstaudio"))
    return FALSE;

  if (!gst_element_register (plugin, "afsrc", GST_RANK_NONE, GST_TYPE_AFSRC))
    return FALSE;

#ifdef ENABLE_NLS
  setlocale (LC_ALL, "");
  bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
#endif /* ENABLE_NLS */

  return TRUE;
}


/* this is where we open the audiofile */
static gboolean
gst_afsrc_open_file (GstAFSrc * src)
{
  g_return_val_if_fail (!GST_OBJECT_FLAG_IS_SET (src, GST_AFSRC_OPEN), FALSE);

  /* open the file */
  src->file = afOpenFile (src->filename, "r", AF_NULL_FILESETUP);
  if (src->file == AF_NULL_FILEHANDLE) {
    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ,
        (_("Could not open file \"%s\" for reading."), src->filename),
        ("system error: %s", strerror (errno)));
    return FALSE;
  }

  /* get the audiofile audio parameters */
  {
    int sampleFormat, sampleWidth;

    src->channels = afGetChannels (src->file, AF_DEFAULT_TRACK);
    afGetSampleFormat (src->file, AF_DEFAULT_TRACK,
        &sampleFormat, &sampleWidth);
    switch (sampleFormat) {
      case AF_SAMPFMT_TWOSCOMP:
        src->is_signed = TRUE;
        break;
      case AF_SAMPFMT_UNSIGNED:
        src->is_signed = FALSE;
        break;
      case AF_SAMPFMT_FLOAT:
      case AF_SAMPFMT_DOUBLE:
        GST_DEBUG ("ERROR: float data not supported yet !\n");
    }
    src->rate = (guint) afGetRate (src->file, AF_DEFAULT_TRACK);
    src->width = sampleWidth;
    GST_DEBUG ("input file: %d channels, %d width, %d rate, signed %s\n",
        src->channels, src->width, src->rate, src->is_signed ? "yes" : "no");
  }

  /* set caps on src */
  gst_pad_set_explicit_caps (src->srcpad,
      gst_caps_new_simple ("audio/x-raw-int",
          "endianness", G_TYPE_INT, G_BYTE_ORDER,
          "signed", G_TYPE_BOOLEAN, src->is_signed,
          "width", G_TYPE_INT, src->width,
          "depth", G_TYPE_INT, src->width,
          "rate", G_TYPE_INT, src->rate,
          "channels", G_TYPE_INT, src->channels, NULL));

  GST_OBJECT_FLAG_SET (src, GST_AFSRC_OPEN);

  return TRUE;
}

static void
gst_afsrc_close_file (GstAFSrc * src)
{
/*  g_print ("DEBUG: closing srcfile...\n"); */
  g_return_if_fail (GST_OBJECT_FLAG_IS_SET (src, GST_AFSRC_OPEN));
/*  g_print ("DEBUG: past flag test\n"); */
/*  if (fclose (src->file) != 0)        */
  if (afCloseFile (src->file) != 0) {
    GST_ELEMENT_ERROR (src, RESOURCE, CLOSE,
        (_("Error closing file \"%s\"."), src->filename), GST_ERROR_SYSTEM);
  } else {
    GST_OBJECT_FLAG_UNSET (src, GST_AFSRC_OPEN);
  }
}

static GstStateChangeReturn
gst_afsrc_change_state (GstElement * element, GstStateChange transition)
{
  g_return_val_if_fail (GST_IS_AFSRC (element), GST_STATE_CHANGE_FAILURE);

  /* if going to NULL then close the file */
  if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
/*    printf ("DEBUG: afsrc state change: null pending\n"); */
    if (GST_OBJECT_FLAG_IS_SET (element, GST_AFSRC_OPEN)) {
/*      g_print ("DEBUG: trying to close the src file\n"); */
      gst_afsrc_close_file (GST_AFSRC (element));
    }
  } else if (GST_STATE_PENDING (element) == GST_STATE_READY) {
/*    g_print ("DEBUG: afsrc: ready state pending.  This shouldn't happen at the *end* of a stream\n"); */
    if (!GST_OBJECT_FLAG_IS_SET (element, GST_AFSRC_OPEN)) {
/*      g_print ("DEBUG: GST_AFSRC_OPEN not set\n"); */
      if (!gst_afsrc_open_file (GST_AFSRC (element))) {
/*        g_print ("DEBUG: element tries to open file\n"); */
        return GST_STATE_CHANGE_FAILURE;
      }
    }
  }

  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  return GST_STATE_CHANGE_SUCCESS;
}