mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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433 lines
13 KiB
C
433 lines
13 KiB
C
/* GStreamer
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*
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* Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
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* Copyright (C) 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "gstgiobasesrc.h"
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#include <gst/base/gsttypefindhelper.h>
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GST_DEBUG_CATEGORY_STATIC (gst_gio_base_src_debug);
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#define GST_CAT_DEFAULT gst_gio_base_src_debug
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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#define gst_gio_base_src_parent_class parent_class
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G_DEFINE_TYPE (GstGioBaseSrc, gst_gio_base_src, GST_TYPE_BASE_SRC);
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static void gst_gio_base_src_finalize (GObject * object);
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static gboolean gst_gio_base_src_start (GstBaseSrc * base_src);
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static gboolean gst_gio_base_src_stop (GstBaseSrc * base_src);
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static gboolean gst_gio_base_src_get_size (GstBaseSrc * base_src,
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guint64 * size);
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static gboolean gst_gio_base_src_is_seekable (GstBaseSrc * base_src);
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static gboolean gst_gio_base_src_unlock (GstBaseSrc * base_src);
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static gboolean gst_gio_base_src_unlock_stop (GstBaseSrc * base_src);
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static GstFlowReturn gst_gio_base_src_create (GstBaseSrc * base_src,
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guint64 offset, guint size, GstBuffer ** buf);
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static gboolean gst_gio_base_src_query (GstBaseSrc * base_src,
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GstQuery * query);
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static void
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gst_gio_base_src_class_init (GstGioBaseSrcClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstElementClass *gstelement_class = (GstElementClass *) klass;
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GstBaseSrcClass *gstbasesrc_class = (GstBaseSrcClass *) klass;
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GST_DEBUG_CATEGORY_INIT (gst_gio_base_src_debug, "gio_base_src", 0,
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"GIO base source");
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gobject_class->finalize = gst_gio_base_src_finalize;
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&src_factory));
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gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_gio_base_src_start);
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gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_gio_base_src_stop);
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gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_gio_base_src_get_size);
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gstbasesrc_class->is_seekable =
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GST_DEBUG_FUNCPTR (gst_gio_base_src_is_seekable);
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gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock);
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gstbasesrc_class->unlock_stop =
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GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock_stop);
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gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_gio_base_src_create);
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gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_gio_base_src_query);
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}
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static void
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gst_gio_base_src_init (GstGioBaseSrc * src)
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{
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src->cancel = g_cancellable_new ();
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}
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static void
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gst_gio_base_src_finalize (GObject * object)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (object);
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if (src->cancel) {
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g_object_unref (src->cancel);
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src->cancel = NULL;
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}
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if (src->stream) {
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g_object_unref (src->stream);
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src->stream = NULL;
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}
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if (src->cache) {
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gst_buffer_unref (src->cache);
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src->cache = NULL;
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}
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GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
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}
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static gboolean
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gst_gio_base_src_start (GstBaseSrc * base_src)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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GstGioBaseSrcClass *gbsrc_class = GST_GIO_BASE_SRC_GET_CLASS (src);
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src->position = 0;
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/* FIXME: This will likely block */
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src->stream = gbsrc_class->get_stream (src);
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if (G_UNLIKELY (!G_IS_INPUT_STREAM (src->stream))) {
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GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
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("No input stream provided by subclass"));
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return FALSE;
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} else if (G_UNLIKELY (g_input_stream_is_closed (src->stream))) {
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GST_ELEMENT_ERROR (src, LIBRARY, FAILED, (NULL),
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("Input stream is already closed"));
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return FALSE;
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}
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if (G_IS_SEEKABLE (src->stream))
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src->position = g_seekable_tell (G_SEEKABLE (src->stream));
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GST_DEBUG_OBJECT (src, "started source");
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return TRUE;
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}
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static gboolean
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gst_gio_base_src_stop (GstBaseSrc * base_src)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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GstGioBaseSrcClass *klass = GST_GIO_BASE_SRC_GET_CLASS (src);
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gboolean success;
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GError *err = NULL;
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if (klass->close_on_stop && G_IS_INPUT_STREAM (src->stream)) {
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GST_DEBUG_OBJECT (src, "closing stream");
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/* FIXME: can block but unfortunately we can't use async operations
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* here because they require a running main loop */
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success = g_input_stream_close (src->stream, src->cancel, &err);
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if (!success && !gst_gio_error (src, "g_input_stream_close", &err, NULL)) {
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GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
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("g_input_stream_close failed: %s", err->message));
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g_clear_error (&err);
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} else if (!success) {
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GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
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("g_input_stream_close failed"));
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} else {
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GST_DEBUG_OBJECT (src, "g_input_stream_close succeeded");
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}
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g_object_unref (src->stream);
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src->stream = NULL;
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} else {
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g_object_unref (src->stream);
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src->stream = NULL;
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}
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return TRUE;
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}
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static gboolean
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gst_gio_base_src_get_size (GstBaseSrc * base_src, guint64 * size)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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if (G_IS_FILE_INPUT_STREAM (src->stream)) {
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GFileInfo *info;
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GError *err = NULL;
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info = g_file_input_stream_query_info (G_FILE_INPUT_STREAM (src->stream),
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G_FILE_ATTRIBUTE_STANDARD_SIZE, src->cancel, &err);
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if (info != NULL) {
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*size = g_file_info_get_size (info);
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g_object_unref (info);
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GST_DEBUG_OBJECT (src, "found size: %" G_GUINT64_FORMAT, *size);
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return TRUE;
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}
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if (!gst_gio_error (src, "g_file_input_stream_query_info", &err, NULL)) {
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if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
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GST_DEBUG_OBJECT (src, "size information not available");
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else
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GST_WARNING_OBJECT (src, "size information retrieval failed: %s",
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err->message);
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g_clear_error (&err);
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}
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}
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if (GST_GIO_STREAM_IS_SEEKABLE (src->stream)) {
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goffset old;
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goffset stream_size;
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gboolean ret;
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GSeekable *seekable = G_SEEKABLE (src->stream);
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GError *err = NULL;
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old = g_seekable_tell (seekable);
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ret = g_seekable_seek (seekable, 0, G_SEEK_END, src->cancel, &err);
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if (!ret) {
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if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {
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if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
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GST_DEBUG_OBJECT (src,
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"Seeking to the end of stream is not supported");
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else
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GST_WARNING_OBJECT (src, "Seeking to end of stream failed: %s",
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err->message);
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g_clear_error (&err);
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} else {
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GST_WARNING_OBJECT (src, "Seeking to end of stream failed");
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}
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return FALSE;
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}
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stream_size = g_seekable_tell (seekable);
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ret = g_seekable_seek (seekable, old, G_SEEK_SET, src->cancel, &err);
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if (!ret) {
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if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {
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if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
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GST_ERROR_OBJECT (src, "Seeking to the old position not supported");
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else
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GST_ERROR_OBJECT (src, "Seeking to the old position failed: %s",
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err->message);
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g_clear_error (&err);
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} else {
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GST_ERROR_OBJECT (src, "Seeking to the old position faile");
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}
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return FALSE;
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}
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if (stream_size >= 0) {
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*size = stream_size;
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return TRUE;
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}
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}
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return FALSE;
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}
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static gboolean
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gst_gio_base_src_is_seekable (GstBaseSrc * base_src)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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gboolean seekable;
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seekable = GST_GIO_STREAM_IS_SEEKABLE (src->stream);
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GST_DEBUG_OBJECT (src, "can seek: %d", seekable);
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return seekable;
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}
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static gboolean
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gst_gio_base_src_unlock (GstBaseSrc * base_src)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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GST_LOG_OBJECT (src, "triggering cancellation");
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g_cancellable_cancel (src->cancel);
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return TRUE;
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}
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static gboolean
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gst_gio_base_src_unlock_stop (GstBaseSrc * base_src)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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GST_LOG_OBJECT (src, "resetting cancellable");
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g_cancellable_reset (src->cancel);
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return TRUE;
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}
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static GstFlowReturn
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gst_gio_base_src_create (GstBaseSrc * base_src, guint64 offset, guint size,
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GstBuffer ** buf_return)
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{
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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GstBuffer *buf;
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GstFlowReturn ret = GST_FLOW_OK;
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g_return_val_if_fail (G_IS_INPUT_STREAM (src->stream), GST_FLOW_ERROR);
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/* If we have the requested part in our cache take a subbuffer of that,
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* otherwise fill the cache again with at least 4096 bytes from the
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* requested offset and return a subbuffer of that.
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*
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* We need caching because every read/seek operation will need to go
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* over DBus if our backend is GVfs and this is painfully slow. */
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if (src->cache && offset >= GST_BUFFER_OFFSET (src->cache) &&
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offset + size <= GST_BUFFER_OFFSET_END (src->cache)) {
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GST_DEBUG_OBJECT (src, "Creating subbuffer from cached buffer: offset %"
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G_GUINT64_FORMAT " length %u", offset, size);
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buf = gst_buffer_copy_region (src->cache, GST_BUFFER_COPY_ALL,
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offset - GST_BUFFER_OFFSET (src->cache), size);
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GST_BUFFER_OFFSET (buf) = offset;
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GST_BUFFER_OFFSET_END (buf) = offset + size;
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} else {
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guint cachesize = MAX (4096, size);
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guint8 *bdata;
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gssize read, res;
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gboolean success, eos;
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GError *err = NULL;
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if (src->cache) {
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gst_buffer_unref (src->cache);
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src->cache = NULL;
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}
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if (G_UNLIKELY (offset != src->position)) {
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if (!GST_GIO_STREAM_IS_SEEKABLE (src->stream))
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return GST_FLOW_NOT_SUPPORTED;
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GST_DEBUG_OBJECT (src, "Seeking to position %" G_GUINT64_FORMAT, offset);
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ret = gst_gio_seek (src, G_SEEKABLE (src->stream), offset, src->cancel);
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if (ret == GST_FLOW_OK)
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src->position = offset;
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else
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return ret;
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}
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src->cache = gst_buffer_new_and_alloc (cachesize);
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if (G_UNLIKELY (src->cache == NULL)) {
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GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", cachesize);
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return GST_FLOW_ERROR;
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}
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GST_LOG_OBJECT (src, "Reading %u bytes from offset %" G_GUINT64_FORMAT,
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cachesize, offset);
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/* GIO sometimes gives less bytes than requested although
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* it's not at the end of file. SMB for example only
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* supports reads up to 64k. So we loop here until we get at
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* at least the requested amount of bytes or a read returns
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* nothing. */
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bdata = gst_buffer_map (src->cache, NULL, NULL, GST_MAP_WRITE);
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read = 0;
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while (size - read > 0 && (res =
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g_input_stream_read (G_INPUT_STREAM (src->stream),
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bdata + read, cachesize - read, src->cancel, &err)) > 0) {
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read += res;
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}
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gst_buffer_unmap (src->cache, bdata, read);
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success = (read >= 0);
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eos = (cachesize > 0 && read == 0);
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if (!success && !gst_gio_error (src, "g_input_stream_read", &err, &ret)) {
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GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
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("Could not read from stream: %s", err->message));
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g_clear_error (&err);
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}
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if (success && !eos) {
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src->position += read;
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GST_BUFFER_OFFSET (src->cache) = offset;
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GST_BUFFER_OFFSET_END (src->cache) = offset + read;
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GST_DEBUG_OBJECT (src, "Read successful");
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GST_DEBUG_OBJECT (src, "Creating subbuffer from new "
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"cached buffer: offset %" G_GUINT64_FORMAT " length %u", offset,
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size);
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buf =
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gst_buffer_copy_region (src->cache, GST_BUFFER_COPY_ALL, 0, MIN (size,
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read));
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GST_BUFFER_OFFSET (buf) = offset;
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GST_BUFFER_OFFSET_END (buf) = offset + MIN (size, read);
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} else {
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GST_DEBUG_OBJECT (src, "Read not successful");
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gst_buffer_unref (src->cache);
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src->cache = NULL;
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buf = NULL;
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}
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if (eos)
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ret = GST_FLOW_UNEXPECTED;
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}
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*buf_return = buf;
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return ret;
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}
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static gboolean
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gst_gio_base_src_query (GstBaseSrc * base_src, GstQuery * query)
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{
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gboolean ret = FALSE;
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GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_URI:
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if (GST_IS_URI_HANDLER (src)) {
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const gchar *uri = gst_uri_handler_get_uri (GST_URI_HANDLER (src));
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gst_query_set_uri (query, uri);
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ret = TRUE;
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}
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break;
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default:
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ret = FALSE;
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break;
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}
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if (!ret)
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ret = GST_BASE_SRC_CLASS (parent_class)->query (base_src, query);
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return ret;
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}
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