1 /*****************************************************************************
2 * avio.c: access using libavformat library
3 *****************************************************************************
4 * Copyright (C) 2009 Laurent Aimar
7 * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
29 #include <vlc_common.h>
30 #include <vlc_plugin.h>
31 #include <vlc_access.h>
32 #include <vlc_avcodec.h>
36 /*****************************************************************************
38 *****************************************************************************/
45 /*****************************************************************************
47 *****************************************************************************/
48 static ssize_t Read (access_t *, uint8_t *, size_t);
49 static int Seek (access_t *, int64_t);
50 static int Control(access_t *, int, va_list);
52 static int SetupAvio(access_t *);
59 int OpenAvio(vlc_object_t *object)
61 access_t *access = (access_t*)object;
65 access->p_sys = sys = malloc(sizeof(*sys));
69 /* We can either accept only one user (actually) or multiple ones
70 * with an exclusive lock */
71 if (SetupAvio(access)) {
72 msg_Err(access, "Module aready in use");
83 * - url (only a subset of available protocols).
86 if (!strcmp(access->psz_access, "avio"))
87 url = strdup(access->psz_path);
88 else if (asprintf(&url, "%s://%s", access->psz_access, access->psz_path) < 0)
94 msg_Dbg(access, "Opening '%s'", url);
95 if (url_open(&sys->context, url, URL_RDONLY) < 0 )
100 msg_Err(access, "Failed to open url using libavformat");
103 const int64_t size = url_filesize(sys->context);
104 msg_Dbg(access, "is_streamed=%d size=%lld", sys->context->is_streamed, size);
107 access_InitFields(access);
108 access->info.i_size = size > 0 ? size : 0;
110 access->pf_read = Read;
111 access->pf_block = NULL;
112 access->pf_control = Control;
113 access->pf_seek = Seek;
123 void CloseAvio(vlc_object_t *object)
125 access_t *access = (access_t*)object;
126 access_sys_t *sys = access->p_sys;
128 url_close(sys->context);
135 static ssize_t Read(access_t *access, uint8_t *data, size_t size)
137 /* FIXME I am unsure of the meaning of the return value in case
140 int r = url_read(access->p_sys->context, data, size);
141 access->info.b_eof = r <= 0;
144 access->info.i_pos += r;
147 static int Seek(access_t *access, int64_t position)
149 access_sys_t *sys = access->p_sys;
151 if (url_seek(sys->context, position, SEEK_SET) < 0) {
152 msg_Err(access, "Seek to %lld failed\n", position);
153 if (access->info.i_size <= 0 || position != access->info.i_size)
156 access->info.i_pos = position;
157 access->info.b_eof = false;
160 static int Control(access_t *access, int query, va_list args)
162 access_sys_t *sys = access->p_sys;
165 case ACCESS_CAN_SEEK:
166 case ACCESS_CAN_FASTSEEK: { /* FIXME how to do that ? */
167 bool *b = va_arg(args, bool *);
168 *b = !sys->context->is_streamed;
171 case ACCESS_CAN_PAUSE: {
172 bool *b = va_arg(args, bool *);
173 *b = sys->context->prot->url_read_pause != NULL; /* FIXME Unsure */
176 case ACCESS_CAN_CONTROL_PACE: {
177 bool *b = va_arg(args, bool *);
178 *b = true; /* FIXME */
181 case ACCESS_GET_PTS_DELAY: {
182 int64_t *delay = va_arg(args, int64_t *);
183 *delay = DEFAULT_PTS_DELAY; /* FIXME */
185 case ACCESS_SET_PAUSE_STATE: {
186 bool is_paused = va_arg(args, int);
187 if (av_url_read_pause(sys->context, is_paused)< 0)
191 case ACCESS_GET_TITLE_INFO:
192 case ACCESS_GET_META:
193 case ACCESS_GET_CONTENT_TYPE:
194 case ACCESS_GET_SIGNAL:
195 case ACCESS_SET_TITLE:
196 case ACCESS_SET_SEEKPOINT:
197 case ACCESS_SET_PRIVATE_ID_STATE:
198 case ACCESS_SET_PRIVATE_ID_CA:
199 case ACCESS_GET_PRIVATE_ID_STATE:
206 static vlc_mutex_t avio_lock = VLC_STATIC_MUTEX;
207 static access_t *current_access = NULL;
209 static int UrlInterruptCallback(void)
211 assert(current_access);
212 return !vlc_object_alive(current_access);
214 static int SetupAvio(access_t *access)
216 vlc_mutex_lock(&avio_lock);
217 assert(!access != !current_access);
218 if (access && current_access) {
219 vlc_mutex_unlock(&avio_lock);
222 url_set_interrupt_cb(access ? UrlInterruptCallback : NULL);
223 current_access = access;
224 vlc_mutex_unlock(&avio_lock);