gstreamer/gst/gio/gstgiobasesrc.c
2019-08-30 13:05:36 +00:00

457 lines
14 KiB
C

/* GStreamer
*
* Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
* Copyright (C) 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gstgiobasesrc.h"
#include <gst/base/gsttypefindhelper.h>
GST_DEBUG_CATEGORY_STATIC (gst_gio_base_src_debug);
#define GST_CAT_DEFAULT gst_gio_base_src_debug
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#define gst_gio_base_src_parent_class parent_class
G_DEFINE_TYPE (GstGioBaseSrc, gst_gio_base_src, GST_TYPE_BASE_SRC);
static void gst_gio_base_src_finalize (GObject * object);
static gboolean gst_gio_base_src_start (GstBaseSrc * base_src);
static gboolean gst_gio_base_src_stop (GstBaseSrc * base_src);
static gboolean gst_gio_base_src_get_size (GstBaseSrc * base_src,
guint64 * size);
static gboolean gst_gio_base_src_is_seekable (GstBaseSrc * base_src);
static gboolean gst_gio_base_src_unlock (GstBaseSrc * base_src);
static gboolean gst_gio_base_src_unlock_stop (GstBaseSrc * base_src);
static GstFlowReturn gst_gio_base_src_create (GstBaseSrc * base_src,
guint64 offset, guint size, GstBuffer ** buf);
static gboolean gst_gio_base_src_query (GstBaseSrc * base_src,
GstQuery * query);
static void
gst_gio_base_src_class_init (GstGioBaseSrcClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseSrcClass *gstbasesrc_class = (GstBaseSrcClass *) klass;
GST_DEBUG_CATEGORY_INIT (gst_gio_base_src_debug, "gio_base_src", 0,
"GIO base source");
gobject_class->finalize = gst_gio_base_src_finalize;
gst_element_class_add_static_pad_template (gstelement_class, &src_factory);
gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_gio_base_src_start);
gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_gio_base_src_stop);
gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_gio_base_src_get_size);
gstbasesrc_class->is_seekable =
GST_DEBUG_FUNCPTR (gst_gio_base_src_is_seekable);
gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock);
gstbasesrc_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock_stop);
gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_gio_base_src_create);
gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_gio_base_src_query);
}
static void
gst_gio_base_src_init (GstGioBaseSrc * src)
{
src->cancel = g_cancellable_new ();
}
static void
gst_gio_base_src_finalize (GObject * object)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (object);
if (src->cancel) {
g_object_unref (src->cancel);
src->cancel = NULL;
}
if (src->stream) {
g_object_unref (src->stream);
src->stream = NULL;
}
if (src->cache) {
gst_buffer_unref (src->cache);
src->cache = NULL;
}
GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}
static gboolean
gst_gio_base_src_start (GstBaseSrc * base_src)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
GstGioBaseSrcClass *gbsrc_class = GST_GIO_BASE_SRC_GET_CLASS (src);
src->position = 0;
/* FIXME: This will likely block */
src->stream = gbsrc_class->get_stream (src);
if (G_UNLIKELY (!G_IS_INPUT_STREAM (src->stream))) {
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
("No input stream provided by subclass"));
return FALSE;
} else if (G_UNLIKELY (g_input_stream_is_closed (src->stream))) {
GST_ELEMENT_ERROR (src, LIBRARY, FAILED, (NULL),
("Input stream is already closed"));
return FALSE;
}
if (G_IS_SEEKABLE (src->stream))
src->position = g_seekable_tell (G_SEEKABLE (src->stream));
GST_DEBUG_OBJECT (src, "started source");
return TRUE;
}
static gboolean
gst_gio_base_src_stop (GstBaseSrc * base_src)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
GstGioBaseSrcClass *klass = GST_GIO_BASE_SRC_GET_CLASS (src);
gboolean success;
GError *err = NULL;
if (klass->close_on_stop && G_IS_INPUT_STREAM (src->stream)) {
GST_DEBUG_OBJECT (src, "closing stream");
/* FIXME: can block but unfortunately we can't use async operations
* here because they require a running main loop */
success = g_input_stream_close (src->stream, src->cancel, &err);
if (!success && !gst_gio_error (src, "g_input_stream_close", &err, NULL)) {
GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
("g_input_stream_close failed: %s", err->message));
g_clear_error (&err);
} else if (!success) {
GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
("g_input_stream_close failed"));
} else {
GST_DEBUG_OBJECT (src, "g_input_stream_close succeeded");
}
g_object_unref (src->stream);
src->stream = NULL;
} else {
g_object_unref (src->stream);
src->stream = NULL;
}
return TRUE;
}
static gboolean
gst_gio_base_src_get_size (GstBaseSrc * base_src, guint64 * size)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
if (G_IS_FILE_INPUT_STREAM (src->stream)) {
GFileInfo *info;
GError *err = NULL;
info = g_file_input_stream_query_info (G_FILE_INPUT_STREAM (src->stream),
G_FILE_ATTRIBUTE_STANDARD_SIZE, src->cancel, &err);
if (info != NULL) {
*size = g_file_info_get_size (info);
g_object_unref (info);
GST_DEBUG_OBJECT (src, "found size: %" G_GUINT64_FORMAT, *size);
return TRUE;
}
if (!gst_gio_error (src, "g_file_input_stream_query_info", &err, NULL)) {
if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
GST_DEBUG_OBJECT (src, "size information not available");
else
GST_WARNING_OBJECT (src, "size information retrieval failed: %s",
err->message);
g_clear_error (&err);
}
}
if (GST_GIO_STREAM_IS_SEEKABLE (src->stream)) {
goffset old;
goffset stream_size;
gboolean ret;
GSeekable *seekable = G_SEEKABLE (src->stream);
GError *err = NULL;
old = g_seekable_tell (seekable);
ret = g_seekable_seek (seekable, 0, G_SEEK_END, src->cancel, &err);
if (!ret) {
if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {
if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
GST_DEBUG_OBJECT (src,
"Seeking to the end of stream is not supported");
else
GST_WARNING_OBJECT (src, "Seeking to end of stream failed: %s",
err->message);
g_clear_error (&err);
} else {
GST_WARNING_OBJECT (src, "Seeking to end of stream failed");
}
return FALSE;
}
stream_size = g_seekable_tell (seekable);
ret = g_seekable_seek (seekable, old, G_SEEK_SET, src->cancel, &err);
if (!ret) {
if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {
if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
GST_ERROR_OBJECT (src, "Seeking to the old position not supported");
else
GST_ERROR_OBJECT (src, "Seeking to the old position failed: %s",
err->message);
g_clear_error (&err);
} else {
GST_ERROR_OBJECT (src, "Seeking to the old position failed");
}
return FALSE;
}
if (stream_size >= 0) {
*size = stream_size;
return TRUE;
}
}
return FALSE;
}
static gboolean
gst_gio_base_src_is_seekable (GstBaseSrc * base_src)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
gboolean seekable;
seekable = GST_GIO_STREAM_IS_SEEKABLE (src->stream);
GST_DEBUG_OBJECT (src, "can seek: %d", seekable);
return seekable;
}
static gboolean
gst_gio_base_src_unlock (GstBaseSrc * base_src)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
GST_LOG_OBJECT (src, "triggering cancellation");
g_cancellable_cancel (src->cancel);
return TRUE;
}
static gboolean
gst_gio_base_src_unlock_stop (GstBaseSrc * base_src)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
GST_LOG_OBJECT (src, "resetting cancellable");
g_object_unref (src->cancel);
src->cancel = g_cancellable_new ();
return TRUE;
}
static GstFlowReturn
gst_gio_base_src_create (GstBaseSrc * base_src, guint64 offset, guint size,
GstBuffer ** buf_return)
{
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
GstBuffer *buf;
GstFlowReturn ret = GST_FLOW_OK;
g_return_val_if_fail (G_IS_INPUT_STREAM (src->stream), GST_FLOW_ERROR);
/* If we have the requested part in our cache take a subbuffer of that,
* otherwise fill the cache again with at least 4096 bytes from the
* requested offset and return a subbuffer of that.
*
* We need caching because every read/seek operation will need to go
* over DBus if our backend is GVfs and this is painfully slow. */
if (src->cache && offset >= GST_BUFFER_OFFSET (src->cache) &&
offset + size <= GST_BUFFER_OFFSET_END (src->cache)) {
GST_DEBUG_OBJECT (src, "Creating subbuffer from cached buffer: offset %"
G_GUINT64_FORMAT " length %u", offset, size);
buf = gst_buffer_copy_region (src->cache, GST_BUFFER_COPY_ALL,
offset - GST_BUFFER_OFFSET (src->cache), size);
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_OFFSET_END (buf) = offset + size;
} else {
guint cachesize = MAX (4096, size);
GstMapInfo map;
gssize read, streamread, res;
guint64 readoffset;
gboolean success, eos;
GError *err = NULL;
GstBuffer *newbuffer;
GstMemory *mem;
newbuffer = gst_buffer_new ();
/* copy any overlapping data from the cached buffer */
if (src->cache && offset >= GST_BUFFER_OFFSET (src->cache) &&
offset <= GST_BUFFER_OFFSET_END (src->cache)) {
read = GST_BUFFER_OFFSET_END (src->cache) - offset;
GST_LOG_OBJECT (src,
"Copying %" G_GSSIZE_FORMAT " bytes from cached buffer at %"
G_GUINT64_FORMAT, read, offset - GST_BUFFER_OFFSET (src->cache));
gst_buffer_copy_into (newbuffer, src->cache, GST_BUFFER_COPY_MEMORY,
offset - GST_BUFFER_OFFSET (src->cache), read);
} else {
read = 0;
}
if (src->cache)
gst_buffer_unref (src->cache);
src->cache = newbuffer;
readoffset = offset + read;
GST_LOG_OBJECT (src,
"Reading %u bytes from offset %" G_GUINT64_FORMAT, cachesize,
readoffset);
if (G_UNLIKELY (readoffset != src->position)) {
if (!GST_GIO_STREAM_IS_SEEKABLE (src->stream))
return GST_FLOW_NOT_SUPPORTED;
GST_DEBUG_OBJECT (src, "Seeking to position %" G_GUINT64_FORMAT,
readoffset);
ret =
gst_gio_seek (src, G_SEEKABLE (src->stream), readoffset, src->cancel);
if (ret == GST_FLOW_OK)
src->position = readoffset;
else
return ret;
}
/* GIO sometimes gives less bytes than requested although
* it's not at the end of file. SMB for example only
* supports reads up to 64k. So we loop here until we get at
* at least the requested amount of bytes or a read returns
* nothing. */
mem = gst_allocator_alloc (NULL, cachesize, NULL);
if (mem == NULL) {
GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", cachesize);
return GST_FLOW_ERROR;
}
gst_memory_map (mem, &map, GST_MAP_WRITE);
streamread = 0;
while (size - read > 0 && (res =
g_input_stream_read (G_INPUT_STREAM (src->stream),
map.data + streamread, cachesize - streamread, src->cancel,
&err)) > 0) {
read += res;
streamread += res;
src->position += res;
}
gst_memory_unmap (mem, &map);
gst_buffer_append_memory (src->cache, mem);
success = (read >= 0);
eos = (cachesize > 0 && read == 0);
if (!success && !gst_gio_error (src, "g_input_stream_read", &err, &ret)) {
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("Could not read from stream: %s", err->message));
g_clear_error (&err);
}
if (success && !eos) {
GST_BUFFER_OFFSET (src->cache) = offset;
GST_BUFFER_OFFSET_END (src->cache) = offset + read;
GST_DEBUG_OBJECT (src, "Read successful");
GST_DEBUG_OBJECT (src, "Creating subbuffer from new "
"cached buffer: offset %" G_GUINT64_FORMAT " length %u", offset,
size);
buf =
gst_buffer_copy_region (src->cache, GST_BUFFER_COPY_ALL, 0, MIN (size,
read));
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_OFFSET_END (buf) = offset + MIN (size, read);
} else {
GST_DEBUG_OBJECT (src, "Read not successful");
gst_buffer_unref (src->cache);
src->cache = NULL;
buf = NULL;
}
if (eos)
ret = GST_FLOW_EOS;
}
*buf_return = buf;
return ret;
}
static gboolean
gst_gio_base_src_query (GstBaseSrc * base_src, GstQuery * query)
{
gboolean ret = FALSE;
GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_URI:
if (GST_IS_URI_HANDLER (src)) {
gchar *uri = gst_uri_handler_get_uri (GST_URI_HANDLER (src));
gst_query_set_uri (query, uri);
g_free (uri);
ret = TRUE;
}
break;
default:
ret = FALSE;
break;
}
if (!ret)
ret = GST_BASE_SRC_CLASS (parent_class)->query (base_src, query);
return ret;
}