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 *, uint64_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_location);
88 else if (asprintf(&url, "%s://%s", access->psz_access,
89 access->psz_location) < 0)
95 msg_Dbg(access, "Opening '%s'", url);
96 if (url_open(&sys->context, url, URL_RDONLY) < 0 )
101 msg_Err(access, "Failed to open url using libavformat");
104 const int64_t size = url_filesize(sys->context);
105 msg_Dbg(access, "is_streamed=%d size=%"PRIi64, sys->context->is_streamed, size);
108 access_InitFields(access);
109 access->info.i_size = size > 0 ? size : 0;
111 access->pf_read = Read;
112 access->pf_block = NULL;
113 access->pf_control = Control;
114 access->pf_seek = Seek;
126 void CloseAvio(vlc_object_t *object)
128 access_t *access = (access_t*)object;
129 access_sys_t *sys = access->p_sys;
131 url_close(sys->context);
139 static ssize_t Read(access_t *access, uint8_t *data, size_t size)
141 /* FIXME I am unsure of the meaning of the return value in case
144 int r = url_read(access->p_sys->context, data, size);
145 access->info.b_eof = r <= 0;
148 access->info.i_pos += r;
153 static int Seek(access_t *access, uint64_t position)
155 access_sys_t *sys = access->p_sys;
157 if (position > INT64_MAX ||
158 url_seek(sys->context, position, SEEK_SET) < 0) {
159 msg_Err(access, "Seek to %"PRIu64" failed\n", position);
160 if (access->info.i_size <= 0 || position != access->info.i_size)
163 access->info.i_pos = position;
164 access->info.b_eof = false;
169 static int Control(access_t *access, int query, va_list args)
171 access_sys_t *sys = access->p_sys;
174 case ACCESS_CAN_SEEK:
175 case ACCESS_CAN_FASTSEEK: { /* FIXME how to do that ? */
176 bool *b = va_arg(args, bool *);
177 *b = !sys->context->is_streamed;
180 case ACCESS_CAN_PAUSE: {
181 bool *b = va_arg(args, bool *);
182 *b = sys->context->prot->url_read_pause != NULL; /* FIXME Unsure */
185 case ACCESS_CAN_CONTROL_PACE: {
186 bool *b = va_arg(args, bool *);
187 *b = true; /* FIXME */
190 case ACCESS_GET_PTS_DELAY: {
191 int64_t *delay = va_arg(args, int64_t *);
192 *delay = DEFAULT_PTS_DELAY; /* FIXME */
194 case ACCESS_SET_PAUSE_STATE: {
195 bool is_paused = va_arg(args, int);
196 if (av_url_read_pause(sys->context, is_paused)< 0)
200 case ACCESS_GET_TITLE_INFO:
201 case ACCESS_GET_META:
202 case ACCESS_GET_CONTENT_TYPE:
203 case ACCESS_GET_SIGNAL:
204 case ACCESS_SET_TITLE:
205 case ACCESS_SET_SEEKPOINT:
206 case ACCESS_SET_PRIVATE_ID_STATE:
207 case ACCESS_SET_PRIVATE_ID_CA:
208 case ACCESS_GET_PRIVATE_ID_STATE:
215 static vlc_mutex_t avio_lock = VLC_STATIC_MUTEX;
216 static access_t *current_access = NULL;
219 static int UrlInterruptCallback(void)
221 assert(current_access);
222 return !vlc_object_alive(current_access);
226 static int SetupAvio(access_t *access)
228 vlc_mutex_lock(&avio_lock);
229 assert(!access != !current_access);
230 if (access && current_access) {
231 vlc_mutex_unlock(&avio_lock);
234 url_set_interrupt_cb(access ? UrlInterruptCallback : NULL);
235 current_access = access;
236 vlc_mutex_unlock(&avio_lock);