swfdec/swfdec_audio_decoder_gst.c

   1 /* Swfdec
   2  * Copyright (C) 2006-2008 Benjamin Otte <otte@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <gst/pbutils/pbutils.h>
  25
  26 #include "swfdec_audio_decoder_gst.h"
  27 #include "swfdec_debug.h"
  28 #include "swfdec_internal.h"
  29
  30 /*** CAPS MATCHING ***/
  31
  32 static GstCaps *
  33 swfdec_audio_decoder_get_caps (guint codec, SwfdecAudioFormat format)
  34 {
  35   GstCaps *caps;
  36   char *s;
  37
  38   switch (codec) {
  39     case SWFDEC_AUDIO_CODEC_MP3:
  40       s = g_strdup ("audio/mpeg, mpegversion=(int)1, layer=(int)3");
  41       break;
  42     case SWFDEC_AUDIO_CODEC_NELLYMOSER_8KHZ:
  43       s = g_strdup ("audio/x-nellymoser, rate=8000, channels=1");
  44       break;
  45     case SWFDEC_AUDIO_CODEC_NELLYMOSER:
  46       s = g_strdup_printf ("audio/x-nellymoser, rate=%d, channels=%d",
  47           swfdec_audio_format_get_rate (format),
  48           swfdec_audio_format_get_channels (format));
  49       break;
  50     default:
  51       return NULL;
  52   }
  53
  54   caps = gst_caps_from_string (s);
  55   g_assert (caps);
  56   g_free (s);
  57   return caps;
  58 }
  59
  60 G_DEFINE_TYPE (SwfdecAudioDecoderGst, swfdec_audio_decoder_gst, SWFDEC_TYPE_AUDIO_DECODER)
  61
  62 static gboolean
  63 swfdec_audio_decoder_gst_prepare (guint codec, SwfdecAudioFormat format, char **detail)
  64 {
  65   GstElementFactory *factory;
  66   GstCaps *caps;
  67
  68   /* Check if we can handle the format at all. If not, no plugin will help us. */
  69   caps = swfdec_audio_decoder_get_caps (codec, format);
  70   if (caps == NULL)
  71     return FALSE;
  72
  73   /* If we can already handle it, woohoo! */
  74   factory = swfdec_gst_get_element_factory (caps);
  75   if (factory != NULL) {
  76     gst_object_unref (factory);
  77     gst_caps_unref (caps);
  78     return TRUE;
  79   }
  80
  81   /* need to install plugins... */
  82   *detail = gst_missing_decoder_installer_detail_new (caps);
  83   gst_caps_unref (caps);
  84   return FALSE;
  85 }
  86
  87 static const char *
  88 swfdec_audio_decoder_get_resampler (void)
  89 {
  90   /* FIXME: This is hardcoded as there's no autopluggable way to get the
  91    * best resampler by rank.
  92    * Even if there were, audioresample (which has the highest rank) is so slow
  93    * it takes roughly a second to resample stuff that ffaudioresample does in
  94    * 0.05 seconds.
  95    */
  96   static const char *options[] = { "ffaudioresample", "speexresample", "audioresample" };
  97   guint i;
  98
  99   for (i = 0; i < G_N_ELEMENTS (options); i++) {
 100     GstElementFactory *factory = gst_element_factory_find (options[i]);
 101     if (factory) {
 102       gst_object_unref (factory);
 103       return options[i];
 104     }
 105   }
 106   SWFDEC_ERROR ("no resampling element found. Check that GStreamer's base plugins are installed.");
 107   return NULL;
 108 }
 109
 110 static SwfdecAudioDecoder *
 111 swfdec_audio_decoder_gst_create (guint type, SwfdecAudioFormat format, SwfdecBuffer *data)
 112 {
 113   SwfdecAudioDecoderGst *player;
 114   GstCaps *srccaps, *sinkcaps;
 115   const char *resample;
 116
 117   srccaps = swfdec_audio_decoder_get_caps (type, format);
 118   if (srccaps == NULL)
 119     return NULL;
 120
 121   player = g_object_new (SWFDEC_TYPE_AUDIO_DECODER_GST, NULL);
 122
 123   /* create decoder */
 124   sinkcaps = gst_caps_from_string ("audio/x-raw-int, endianness=byte_order, signed=(boolean)true, width=16, depth=16, rate=44100, channels=2");
 125   g_assert (sinkcaps);
 126   resample = swfdec_audio_decoder_get_resampler ();
 127   if (resample == NULL)
 128     goto error;
 129   if (!swfdec_gst_decoder_init (&player->dec, srccaps, sinkcaps,
 130         "audioconvert", resample, NULL))
 131     goto error;
 132
 133   gst_caps_unref (srccaps);
 134   gst_caps_unref (sinkcaps);
 135   return SWFDEC_AUDIO_DECODER (player);
 136
 137 error:
 138   g_object_unref (player);
 139   gst_caps_unref (srccaps);
 140   gst_caps_unref (sinkcaps);
 141   return NULL;
 142 }
 143
 144 static void
 145 swfdec_audio_decoder_gst_push (SwfdecAudioDecoder *dec, SwfdecBuffer *buffer)
 146 {
 147   SwfdecAudioDecoderGst *player = SWFDEC_AUDIO_DECODER_GST (dec);
 148   GstBuffer *buf;
 149
 150   if (buffer == NULL) {
 151     swfdec_gst_decoder_push_eos (&player->dec);
 152   } else {
 153     swfdec_buffer_ref (buffer);
 154     buf = swfdec_gst_buffer_new (buffer);
 155     if (!swfdec_gst_decoder_push (&player->dec, buf))
 156       swfdec_audio_decoder_error (dec, "error pushing");
 157   }
 158 }
 159
 160 static SwfdecBuffer *
 161 swfdec_audio_decoder_gst_pull (SwfdecAudioDecoder *dec)
 162 {
 163   SwfdecAudioDecoderGst *player = SWFDEC_AUDIO_DECODER_GST (dec);
 164   GstBuffer *buf;
 165
 166   buf = swfdec_gst_decoder_pull (&player->dec);
 167   if (buf == NULL)
 168     return NULL;
 169   return swfdec_buffer_new_from_gst (buf);
 170 }
 171
 172 static void
 173 swfdec_audio_decoder_gst_dispose (GObject *object)
 174 {
 175   SwfdecAudioDecoderGst *player = (SwfdecAudioDecoderGst *) object;
 176
 177   swfdec_gst_decoder_finish (&player->dec);
 178
 179   G_OBJECT_CLASS (swfdec_audio_decoder_gst_parent_class)->dispose (object);
 180 }
 181
 182 static void
 183 swfdec_audio_decoder_gst_class_init (SwfdecAudioDecoderGstClass *klass)
 184 {
 185   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 186   SwfdecAudioDecoderClass *decoder_class = SWFDEC_AUDIO_DECODER_CLASS (klass);
 187
 188   object_class->dispose = swfdec_audio_decoder_gst_dispose;
 189
 190   decoder_class->prepare = swfdec_audio_decoder_gst_prepare;
 191   decoder_class->create = swfdec_audio_decoder_gst_create;
 192   decoder_class->pull = swfdec_audio_decoder_gst_pull;
 193   decoder_class->push = swfdec_audio_decoder_gst_push;
 194 }
 195
 196 static void
 197 swfdec_audio_decoder_gst_init (SwfdecAudioDecoderGst *audio_decoder_gst)
 198 {
 199 }
 200