[vlc-commits] access-imem: rewritten in-memory bit stream input (refs #8562)
Rémi Denis-Courmont
git at videolan.org
Mon Mar 30 22:05:07 CEST 2015
vlc | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Thu Mar 26 21:54:52 2015 +0200| [2cb046006667beaedd4aafbcb706b3aee4db4b0d] | committer: Rémi Denis-Courmont
access-imem: rewritten in-memory bit stream input (refs #8562)
This more closely matches the usual open/read/seek/close pattern.
> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=2cb046006667beaedd4aafbcb706b3aee4db4b0d
---
modules/MODULES_LIST | 1 +
modules/access/Makefile.am | 5 +-
modules/access/imem-access.c | 177 ++++++++++++++++++++++++++++++++++++++++++
po/POTFILES.in | 1 +
4 files changed, 183 insertions(+), 1 deletion(-)
diff --git a/modules/MODULES_LIST b/modules/MODULES_LIST
index 5d7814d..10400ef 100644
--- a/modules/MODULES_LIST
+++ b/modules/MODULES_LIST
@@ -8,6 +8,7 @@ $Id$
* access_archive: libarchive based access and stream filter
* access_bd: Blu-Ray Disc access
* access_eyetv: Access module to connect to our plugin running within EyeTV
+ * access_imem: memory bitstream access module
* access_jack: JACK audio input module
* access_mms: MMS over TCP, UDP and HTTP access module
* access_mtp: MTP access module
diff --git a/modules/access/Makefile.am b/modules/access/Makefile.am
index c499d46..c232608 100644
--- a/modules/access/Makefile.am
+++ b/modules/access/Makefile.am
@@ -29,10 +29,13 @@ access_LTLIBRARIES += libfilesystem_plugin.la
libidummy_plugin_la_SOURCES = access/idummy.c
access_LTLIBRARIES += libidummy_plugin.la
-libimem_plugin_la_SOURCES = access/imem.c
+libimem_plugin_la_SOURCES = access/imem-access.c
libimem_plugin_la_LIBADD = $(LIBM)
access_LTLIBRARIES += libimem_plugin.la
+libaccess_imem_plugin_la_SOURCES = access/imem.c
+access_LTLIBRARIES += libaccess_imem_plugin.la
+
librar_plugin_la_SOURCES = access/rar/rar.c access/rar/rar.h \
access/rar/access.c access/rar/stream.c access/rar/module.c
librar_plugin_la_CPPFLAGS = $(AM_CPPFLAGS)
diff --git a/modules/access/imem-access.c b/modules/access/imem-access.c
new file mode 100644
index 0000000..f92006a
--- /dev/null
+++ b/modules/access/imem-access.c
@@ -0,0 +1,177 @@
+/*****************************************************************************
+ * imem-access.c: In-memory bit stream input for VLC
+ *****************************************************************************
+ * Copyright (C) 2015 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#include <assert.h>
+
+#include <vlc_common.h>
+#include <vlc_access.h>
+#include <vlc_plugin.h>
+
+struct access_sys_t
+{
+ void *opaque;
+ ssize_t (*read_cb)(void *, unsigned char *, size_t);
+ int (*seek_cb)(void *, uint64_t);
+ void (*close_cb)(void *);
+ uint64_t size;
+};
+
+static ssize_t Read(access_t *access, uint8_t *buf, size_t len)
+{
+ access_sys_t *sys = access->p_sys;
+
+ ssize_t val = sys->read_cb(sys->opaque, buf, len);
+
+ if (val < 0) {
+ msg_Err(access, "read error");
+ val = 0;
+ }
+
+ if (val > 0) {
+ assert((size_t)val <= len);
+ access->info.i_pos += val;
+ } else
+ access->info.b_eof = true;
+
+ return val;
+}
+
+static int Seek(access_t *access, uint64_t offset)
+{
+ access_sys_t *sys = access->p_sys;
+
+ assert(sys->seek_cb != NULL);
+
+ if (sys->seek_cb(sys->opaque, offset) != 0)
+ return VLC_EGENERIC;
+
+ access->info.b_eof = false;
+ return VLC_SUCCESS;
+}
+
+static int Control(access_t *access, int query, va_list args)
+{
+ access_sys_t *sys = access->p_sys;
+
+ switch (query)
+ {
+ case ACCESS_CAN_SEEK:
+ *va_arg(args, bool *) = sys->seek_cb != NULL;
+ break;
+
+ case ACCESS_CAN_FASTSEEK:
+ *va_arg(args, bool *) = false;
+ break;
+
+ case ACCESS_CAN_PAUSE:
+ case ACCESS_CAN_CONTROL_PACE:
+ *va_arg(args, bool *) = sys->seek_cb != NULL;
+ break;
+
+ case ACCESS_GET_SIZE:
+ *va_arg(args, uint64_t *) = sys->size;
+ break;
+
+ case ACCESS_GET_PTS_DELAY:
+ *va_arg(args, int64_t *) = DEFAULT_PTS_DELAY;
+ break;
+
+ case ACCESS_SET_PAUSE_STATE:
+ break;
+
+ default:
+ return VLC_EGENERIC;
+ }
+ (void) access;
+ return VLC_SUCCESS;
+}
+
+static int open_cb_default(void *opaque, void **datap, size_t *sizep)
+{
+ *datap = opaque;
+ (void) sizep;
+ return 0;
+}
+
+static int Open(vlc_object_t *object)
+{
+ access_t *access = (access_t *)object;
+
+ access_sys_t *sys = malloc(sizeof (*sys));
+ if (unlikely(sys == NULL))
+ return VLC_ENOMEM;
+
+ int (*open_cb)(void *, void **, uint64_t *);
+ void *opaque;
+
+ opaque = var_InheritAddress(access, "imem-data");
+ open_cb = var_InheritAddress(access, "imem-open");
+ sys->opaque = NULL;
+ sys->read_cb = var_InheritAddress(access, "imem-read");
+ sys->seek_cb = var_InheritAddress(access, "imem-seek");
+ sys->close_cb = var_InheritAddress(access, "imem-close");
+ sys->size = 0;
+
+ if (open_cb == NULL)
+ open_cb = open_cb_default;
+ if (sys->read_cb == NULL)
+ goto error;
+
+ if (open_cb(opaque, &sys->opaque, &sys->size)) {
+ msg_Err(access, "open error");
+ goto error;
+ }
+
+ access->pf_read = Read;
+ access->pf_block = NULL;
+ access->pf_seek = (sys->seek_cb != NULL) ? Seek : NULL;
+ access->pf_control = Control;
+
+ access->p_sys = sys;
+ access_InitFields(access);
+ return VLC_SUCCESS;
+error:
+ free(sys);
+ return VLC_EGENERIC;
+}
+
+static void Close(vlc_object_t *object)
+{
+ access_t *access = (access_t *)object;
+ access_sys_t *sys = access->p_sys;
+
+ if (sys->close_cb != NULL)
+ sys->close_cb(sys->opaque);
+ free(sys);
+}
+
+vlc_module_begin()
+ set_shortname(N_("Nemory stream"))
+ set_description(N_("In-memory stream input"))
+ set_category(CAT_INPUT)
+ set_subcategory(SUBCAT_INPUT_ACCESS)
+
+ add_shortcut("imem")
+ set_capability("access", 0)
+ set_callbacks(Open, Close)
+vlc_module_end()
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 8110fd4..2bc143c 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -205,6 +205,7 @@ modules/access/gnomevfs.c
modules/access/http.c
modules/access/idummy.c
modules/access/imem.c
+modules/access/imem-access.c
modules/access/jack.c
modules/access/linsys/linsys_hdsdi.c
modules/access/linsys/linsys_sdi.c
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