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     case SWFDEC_AUDIO_CODEC_AAC:
  51       s = g_strdup_printf ("audio/mpeg, mpegversion=4");
  52       break;
  53     default:
  54       return NULL;
  55   }
  56
  57   caps = gst_caps_from_string (s);
  58   g_assert (caps);
  59   g_free (s);
  60   return caps;
  61 }
  62
  63 G_DEFINE_TYPE (SwfdecAudioDecoderGst, swfdec_audio_decoder_gst, SWFDEC_TYPE_AUDIO_DECODER)
  64
  65 static gboolean
  66 swfdec_audio_decoder_gst_prepare (guint codec, SwfdecAudioFormat format, char **detail)
  67 {
  68   GstElementFactory *factory;
  69   GstCaps *caps;
  70
  71   /* Check if we can handle the format at all. If not, no plugin will help us. */
  72   caps = swfdec_audio_decoder_get_caps (codec, format);
  73   if (caps == NULL)
  74     return FALSE;
  75
  76   /* If we can already handle it, woohoo! */
  77   factory = swfdec_gst_get_element_factory (caps);
  78   if (factory != NULL) {
  79     gst_object_unref (factory);
  80     gst_caps_unref (caps);
  81     return TRUE;
  82   }
  83
  84   /* need to install plugins... */
  85   *detail = gst_missing_decoder_installer_detail_new (caps);
  86   gst_caps_unref (caps);
  87   return FALSE;
  88 }
  89
  90 static const char *
  91 swfdec_audio_decoder_get_resampler (void)
  92 {
  93   /* FIXME: This is hardcoded as there's no autopluggable way to get the
  94    * best resampler by rank.
  95    * Even if there were, audioresample (which has the highest rank) is so slow
  96    * it takes roughly a second to resample stuff that ffaudioresample does in
  97    * 0.05 seconds.
  98    */
  99   static const char *options[] = { "ffaudioresample", "speexresample", "audioresample" };
 100   guint i;
 101
 102   for (i = 0; i < G_N_ELEMENTS (options); i++) {
 103     GstElementFactory *factory = gst_element_factory_find (options[i]);
 104     if (factory) {
 105       gst_object_unref (factory);
 106       return options[i];
 107     }
 108   }
 109   SWFDEC_ERROR ("no resampling element found. Check that GStreamer's base plugins are installed.");
 110   return NULL;
 111 }
 112
 113 static SwfdecAudioDecoder *
 114 swfdec_audio_decoder_gst_create (guint type, SwfdecAudioFormat format)
 115 {
 116   SwfdecAudioDecoderGst *player;
 117   GstCaps *srccaps, *sinkcaps;
 118   const char *resample;
 119
 120   srccaps = swfdec_audio_decoder_get_caps (type, format);
 121   if (srccaps == NULL)
 122     return NULL;
 123
 124   player = g_object_new (SWFDEC_TYPE_AUDIO_DECODER_GST, NULL);
 125
 126   /* create decoder */
 127   sinkcaps = gst_caps_from_string ("audio/x-raw-int, endianness=byte_order, signed=(boolean)true, width=16, depth=16, rate=44100, channels=2");
 128   g_assert (sinkcaps);
 129   resample = swfdec_audio_decoder_get_resampler ();
 130   if (resample == NULL)
 131     goto error;
 132   if (!swfdec_gst_decoder_init (&player->dec, srccaps, sinkcaps,
 133         "audioconvert", resample, NULL))
 134     goto error;
 135
 136   gst_caps_unref (srccaps);
 137   gst_caps_unref (sinkcaps);
 138   return SWFDEC_AUDIO_DECODER (player);
 139
 140 error:
 141   g_object_unref (player);
 142   gst_caps_unref (srccaps);
 143   gst_caps_unref (sinkcaps);
 144   return NULL;
 145 }
 146
 147 static void
 148 swfdec_audio_decoder_gst_set_codec_data (SwfdecAudioDecoder *dec, SwfdecBuffer *buffer)
 149 {
 150   SwfdecAudioDecoderGst *player = SWFDEC_AUDIO_DECODER_GST (dec);
 151
 152   if (buffer) {
 153     GstBuffer *buf = swfdec_gst_buffer_new (swfdec_buffer_ref (buffer));
 154     swfdec_gst_decoder_set_codec_data (&player->dec, buf);
 155     gst_buffer_unref (buf);
 156   } else {
 157     swfdec_gst_decoder_set_codec_data (&player->dec, NULL);
 158   }
 159 }
 160
 161 static void
 162 swfdec_audio_decoder_gst_push (SwfdecAudioDecoder *dec, SwfdecBuffer *buffer)
 163 {
 164   SwfdecAudioDecoderGst *player = SWFDEC_AUDIO_DECODER_GST (dec);
 165   GstBuffer *buf;
 166
 167   if (buffer == NULL) {
 168     swfdec_gst_decoder_push_eos (&player->dec);
 169   } else {
 170     swfdec_buffer_ref (buffer);
 171     buf = swfdec_gst_buffer_new (buffer);
 172     if (!swfdec_gst_decoder_push (&player->dec, buf))
 173       swfdec_audio_decoder_error (dec, "error pushing");
 174   }
 175 }
 176
 177 static SwfdecBuffer *
 178 swfdec_audio_decoder_gst_pull (SwfdecAudioDecoder *dec)
 179 {
 180   SwfdecAudioDecoderGst *player = SWFDEC_AUDIO_DECODER_GST (dec);
 181   GstBuffer *buf;
 182
 183   buf = swfdec_gst_decoder_pull (&player->dec);
 184   if (buf == NULL)
 185     return NULL;
 186   return swfdec_buffer_new_from_gst (buf);
 187 }
 188
 189 static void
 190 swfdec_audio_decoder_gst_dispose (GObject *object)
 191 {
 192   SwfdecAudioDecoderGst *player = (SwfdecAudioDecoderGst *) object;
 193
 194   swfdec_gst_decoder_finish (&player->dec);
 195
 196   G_OBJECT_CLASS (swfdec_audio_decoder_gst_parent_class)->dispose (object);
 197 }
 198
 199 static void
 200 swfdec_audio_decoder_gst_class_init (SwfdecAudioDecoderGstClass *klass)
 201 {
 202   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 203   SwfdecAudioDecoderClass *decoder_class = SWFDEC_AUDIO_DECODER_CLASS (klass);
 204
 205   object_class->dispose = swfdec_audio_decoder_gst_dispose;
 206
 207   decoder_class->prepare = swfdec_audio_decoder_gst_prepare;
 208   decoder_class->create = swfdec_audio_decoder_gst_create;
 209   decoder_class->set_codec_data = swfdec_audio_decoder_gst_set_codec_data;
 210   decoder_class->pull = swfdec_audio_decoder_gst_pull;
 211   decoder_class->push = swfdec_audio_decoder_gst_push;
 212 }
 213
 214 static void
 215 swfdec_audio_decoder_gst_init (SwfdecAudioDecoderGst *audio_decoder_gst)
 216 {
 217 }
 218