1 /* GStreamer

     2  *

     3  * Copyright (C) 2007 Rene Stadler <mail@renestadler.de>

     4  * Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>

     5  * 

     6  * This library is free software; you can redistribute it and/or

     7  * modify it under the terms of the GNU Library General Public

     8  * License as published by the Free Software Foundation; either

     9  * version 2 of the License, or (at your option) any later version.

    10  *

    11  * This library is distributed in the hope that it will be useful,

    12  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14  * Library General Public License for more details.

    15  *

    16  * You should have received a copy of the GNU Library General Public

    17  * License along with this library; if not, write to the

    18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

    19  * Boston, MA 02111-1307, USA.

    20  */

    21 

    22 #ifdef HAVE_CONFIG_H

    23 #include <config.h>

    24 #endif

    25 

    26 #include "gstgiobasesrc.h"

    27 

    28 GST_DEBUG_CATEGORY_STATIC (gst_gio_base_src_debug);

    29 #define GST_CAT_DEFAULT gst_gio_base_src_debug

    30 

    31 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",

    32     GST_PAD_SRC,

    33     GST_PAD_ALWAYS,

    34     GST_STATIC_CAPS_ANY);

    35 

    36 GST_BOILERPLATE (GstGioBaseSrc, gst_gio_base_src, GstBaseSrc,

    37     GST_TYPE_BASE_SRC);

    38 

    39 static void gst_gio_base_src_finalize (GObject * object);

    40 static gboolean gst_gio_base_src_start (GstBaseSrc * base_src);

    41 static gboolean gst_gio_base_src_stop (GstBaseSrc * base_src);

    42 static gboolean gst_gio_base_src_get_size (GstBaseSrc * base_src,

    43     guint64 * size);

    44 static gboolean gst_gio_base_src_is_seekable (GstBaseSrc * base_src);

    45 static gboolean gst_gio_base_src_unlock (GstBaseSrc * base_src);

    46 static gboolean gst_gio_base_src_unlock_stop (GstBaseSrc * base_src);

    47 static gboolean gst_gio_base_src_check_get_range (GstBaseSrc * base_src);

    48 static GstFlowReturn gst_gio_base_src_create (GstBaseSrc * base_src,

    49     guint64 offset, guint size, GstBuffer ** buf);

    50 

    51 static void

    52 gst_gio_base_src_base_init (gpointer gclass)

    53 {

    54   GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);

    55 

    56   GST_DEBUG_CATEGORY_INIT (gst_gio_base_src_debug, "gio_base_src", 0,

    57       "GIO base source");

    58 

    59   gst_element_class_add_pad_template (element_class,

    60       gst_static_pad_template_get (&src_factory));

    61 }

    62 

    63 static void

    64 gst_gio_base_src_class_init (GstGioBaseSrcClass * klass)

    65 {

    66   GObjectClass *gobject_class;

    67   GstElementClass *gstelement_class;

    68   GstBaseSrcClass *gstbasesrc_class;

    69 

    70   gobject_class = (GObjectClass *) klass;

    71   gstelement_class = (GstElementClass *) klass;

    72   gstbasesrc_class = (GstBaseSrcClass *) klass;

    73 

    74   gobject_class->finalize = gst_gio_base_src_finalize;

    75 

    76   gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_gio_base_src_start);

    77   gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_gio_base_src_stop);

    78   gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_gio_base_src_get_size);

    79   gstbasesrc_class->is_seekable =

    80       GST_DEBUG_FUNCPTR (gst_gio_base_src_is_seekable);

    81   gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock);

    82   gstbasesrc_class->unlock_stop =

    83       GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock_stop);

    84   gstbasesrc_class->check_get_range =

    85       GST_DEBUG_FUNCPTR (gst_gio_base_src_check_get_range);

    86   gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_gio_base_src_create);

    87 }

    88 

    89 static void

    90 gst_gio_base_src_init (GstGioBaseSrc * src, GstGioBaseSrcClass * gclass)

    91 {

    92   src->cancel = g_cancellable_new ();

    93 }

    94 

    95 static void

    96 gst_gio_base_src_finalize (GObject * object)

    97 {

    98   GstGioBaseSrc *src = GST_GIO_BASE_SRC (object);

    99 

   100   if (src->cancel) {

   101     g_object_unref (src->cancel);

   102     src->cancel = NULL;

   103   }

   104 

   105   if (src->stream) {

   106     g_object_unref (src->stream);

   107     src->stream = NULL;

   108   }

   109 

   110   GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));

   111 }

   112 

   113 static gboolean

   114 gst_gio_base_src_start (GstBaseSrc * base_src)

   115 {

   116   GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);

   117 

   118   if (!G_IS_INPUT_STREAM (src->stream)) {

   119     GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),

   120         ("No stream given yet"));

   121     return FALSE;

   122   }

   123 

   124   src->position = 0;

   125 

   126   GST_DEBUG_OBJECT (src, "started stream");

   127 

   128   return TRUE;

   129 }

   130 

   131 static gboolean

   132 gst_gio_base_src_stop (GstBaseSrc * base_src)

   133 {

   134   GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);

   135   gboolean success;

   136   GError *err = NULL;

   137 

   138   if (G_IS_INPUT_STREAM (src->stream)) {

   139     GST_DEBUG_OBJECT (src, "closing stream");

   140 

   141     /* FIXME: can block but unfortunately we can't use async operations

   142      * here because they require a running main loop */

   143     success = g_input_stream_close (src->stream, src->cancel, &err);

   144 

   145     if (!success && !gst_gio_error (src, "g_input_stream_close", &err, NULL)) {

   146       GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),

   147           ("g_input_stream_close failed: %s", err->message));

   148       g_clear_error (&err);

   149     } else if (!success) {

   150       GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),

   151           ("g_input_stream_close failed"));

   152     } else {

   153       GST_DEBUG_OBJECT (src, "g_input_stream_close succeeded");

   154     }

   155 

   156     g_object_unref (src->stream);

   157     src->stream = NULL;

   158   }

   159 

   160   return TRUE;

   161 }

   162 

   163 static gboolean

   164 gst_gio_base_src_get_size (GstBaseSrc * base_src, guint64 * size)

   165 {

   166   GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);

   167 

   168   if (G_IS_FILE_INPUT_STREAM (src->stream)) {

   169     GFileInfo *info;

   170     GError *err = NULL;

   171 

   172     info = g_file_input_stream_query_info (G_FILE_INPUT_STREAM (src->stream),

   173         G_FILE_ATTRIBUTE_STANDARD_SIZE, src->cancel, &err);

   174 

   175     if (info != NULL) {

   176       *size = g_file_info_get_size (info);

   177       g_object_unref (info);

   178       GST_DEBUG_OBJECT (src, "found size: %" G_GUINT64_FORMAT, *size);

   179       return TRUE;

   180     }

   181 

   182     if (!gst_gio_error (src, "g_file_input_stream_query_info", &err, NULL)) {

   183 

   184       if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))

   185         GST_DEBUG_OBJECT (src, "size information not available");

   186       else

   187         GST_WARNING_OBJECT (src, "size information retrieval failed: %s",

   188             err->message);

   189 

   190       g_clear_error (&err);

   191     }

   192   } else if (GST_GIO_STREAM_IS_SEEKABLE (src->stream)) {

   193     goffset old;

   194     goffset stream_size;

   195     gboolean ret;

   196     GSeekable *seekable = G_SEEKABLE (src->stream);

   197     GError *err = NULL;

   198 

   199     old = g_seekable_tell (seekable);

   200 

   201     ret = g_seekable_seek (seekable, 0, G_SEEK_END, src->cancel, &err);

   202     if (!ret) {

   203       if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {

   204         if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))

   205           GST_DEBUG_OBJECT (src,

   206               "Seeking to the end of stream is not supported");

   207         else

   208           GST_WARNING_OBJECT (src, "Seeking to end of stream failed: %s",

   209               err->message);

   210         g_clear_error (&err);

   211       } else {

   212         GST_WARNING_OBJECT (src, "Seeking to end of stream failed");

   213       }

   214 

   215       return FALSE;

   216     }

   217 

   218     stream_size = g_seekable_tell (seekable);

   219 

   220     ret = g_seekable_seek (seekable, old, G_SEEK_SET, src->cancel, &err);

   221     if (!ret) {

   222       if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {

   223         if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))

   224           GST_ERROR_OBJECT (src, "Seeking to the old position not supported");

   225         else

   226           GST_ERROR_OBJECT (src, "Seeking to the old position failed: %s",

   227               err->message);

   228         g_clear_error (&err);

   229       } else {

   230         GST_ERROR_OBJECT (src, "Seeking to the old position faile");

   231       }

   232 

   233       return FALSE;

   234     }

   235 

   236     if (stream_size >= 0) {

   237       *size = stream_size;

   238       return TRUE;

   239     }

   240   }

   241 

   242   return FALSE;

   243 }

   244 

   245 static gboolean

   246 gst_gio_base_src_is_seekable (GstBaseSrc * base_src)

   247 {

   248   GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);

   249   gboolean seekable;

   250 

   251   seekable = GST_GIO_STREAM_IS_SEEKABLE (src->stream);

   252 

   253   GST_DEBUG_OBJECT (src, "can seek: %d", seekable);

   254 

   255   return seekable;

   256 }

   257 

   258 static gboolean

   259 gst_gio_base_src_unlock (GstBaseSrc * base_src)

   260 {

   261   GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);

   262 

   263   GST_LOG_OBJECT (src, "triggering cancellation");

   264 

   265   g_cancellable_cancel (src->cancel);

   266 

   267   return TRUE;

   268 }

   269 

   270 static gboolean

   271 gst_gio_base_src_unlock_stop (GstBaseSrc * base_src)

   272 {

   273   GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);

   274 

   275   GST_LOG_OBJECT (src, "resetting cancellable");

   276 

   277   g_cancellable_reset (src->cancel);

   278 

   279   return TRUE;

   280 }

   281 

   282 static gboolean

   283 gst_gio_base_src_check_get_range (GstBaseSrc * base_src)

   284 {

   285   /* FIXME: Implement dry-run variant using guesswork like gnomevfssrc? */

   286 

   287   return GST_CALL_PARENT_WITH_DEFAULT (GST_BASE_SRC_CLASS,

   288       check_get_range, (base_src), FALSE);

   289 }

   290 

   291 static GstFlowReturn

   292 gst_gio_base_src_create (GstBaseSrc * base_src, guint64 offset, guint size,

   293     GstBuffer ** buf_return)

   294 {

   295   GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);

   296   GstBuffer *buf;

   297   gssize read;

   298   gboolean success, eos;

   299   GstFlowReturn ret = GST_FLOW_OK;

   300   GError *err = NULL;

   301 

   302   g_return_val_if_fail (G_IS_INPUT_STREAM (src->stream), GST_FLOW_ERROR);

   303 

   304   if (G_UNLIKELY (offset != src->position)) {

   305     if (!GST_GIO_STREAM_IS_SEEKABLE (src->stream))

   306       return GST_FLOW_NOT_SUPPORTED;

   307 

   308     ret = gst_gio_seek (src, G_SEEKABLE (src->stream), offset, src->cancel);

   309 

   310     if (ret == GST_FLOW_OK)

   311       src->position = offset;

   312     else

   313       return ret;

   314   }

   315 

   316   buf = gst_buffer_new_and_alloc (size);

   317 

   318   GST_LOG_OBJECT (src, "reading %u bytes from offset %" G_GUINT64_FORMAT,

   319       size, offset);

   320 

   321   read =

   322       g_input_stream_read (G_INPUT_STREAM (src->stream), GST_BUFFER_DATA (buf),

   323       size, src->cancel, &err);

   324 

   325   success = (read >= 0);

   326   eos = (size > 0 && read == 0);

   327 

   328   if (!success && !gst_gio_error (src, "g_input_stream_read", &err, &ret)) {

   329     GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),

   330         ("Could not read from stream: %s", err->message));

   331     g_clear_error (&err);

   332   }

   333 

   334   if (success && !eos) {

   335     src->position += read;

   336     GST_BUFFER_OFFSET (buf) = offset;

   337     GST_BUFFER_SIZE (buf) = read;

   338     *buf_return = buf;

   339   } else {

   340     /* !success || eos */

   341     gst_buffer_unref (buf);

   342   }

   343 

   344   if (eos)

   345     ret = GST_FLOW_UNEXPECTED;

   346 

   347   return ret;

   348 }

   349 

   350 void

   351 gst_gio_base_src_set_stream (GstGioBaseSrc * src, GInputStream * stream)

   352 {

   353   gboolean success;

   354   GError *err = NULL;

   355 

   356   g_return_if_fail (G_IS_INPUT_STREAM (stream));

   357   g_return_if_fail ((GST_STATE (src) != GST_STATE_PLAYING &&

   358           GST_STATE (src) != GST_STATE_PAUSED));

   359 

   360   if (G_IS_INPUT_STREAM (src->stream)) {

   361     GST_DEBUG_OBJECT (src, "closing old stream");

   362 

   363     /* FIXME: can block but unfortunately we can't use async operations

   364      * here because they require a running main loop */

   365     success = g_input_stream_close (src->stream, src->cancel, &err);

   366 

   367     if (!success && !gst_gio_error (src, "g_input_stream_close", &err, NULL)) {

   368       GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),

   369           ("g_input_stream_close failed: %s", err->message));

   370       g_clear_error (&err);

   371     } else if (!success) {

   372       GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),

   373           ("g_input_stream_close failed"));

   374     } else {

   375       GST_DEBUG_OBJECT (src, "g_input_stream_close succeeded");

   376     }

   377 

   378     g_object_unref (src->stream);

   379     src->stream = NULL;

   380   }

   381 

   382   src->stream = stream;

   383 }