3 * @brief Game Music Emu demux module for VLC media player
5 /*****************************************************************************
6 * Copyright © 2010 Rémi Denis-Courmont
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 2.1
11 * of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 ****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_input.h>
33 #include <vlc_demux.h>
34 #include <vlc_plugin.h>
38 static int Open (vlc_object_t *);
39 static void Close (vlc_object_t *);
43 set_description ("Game Music Emu")
44 set_category (CAT_INPUT)
45 set_subcategory (SUBCAT_INPUT_DEMUX)
46 set_capability ("demux", 10)
47 set_callbacks (Open, Close)
60 input_title_t **titlev;
65 static int Demux (demux_t *);
66 static int Control (demux_t *, int, va_list);
67 static gme_err_t Reader (void *, void *, int);
69 static int Open (vlc_object_t *obj)
71 demux_t *demux = (demux_t *)obj;
73 int64_t size = stream_Size (demux->s);
74 if (size < 4 /* GME needs to know the file size */
75 || size > LONG_MAX /* too big for GME */)
80 if (stream_Peek (demux->s, &peek, 4) < 4)
83 const char *type = gme_identify_header (peek);
86 msg_Dbg (obj, "detected file type %s", type);
89 demux_sys_t *sys = malloc (sizeof (*sys));
90 if (unlikely(sys == NULL))
93 sys->emu = gme_new_emu (gme_identify_extension (type), RATE);
99 gme_load_custom (sys->emu, Reader, size, demux->s);
100 gme_start_track (sys->emu, sys->track_id = 0);
103 es_format_Init (&fmt, AUDIO_ES, VLC_CODEC_S16N);
104 fmt.audio.i_rate = RATE;
105 fmt.audio.i_bytes_per_frame = 4;
106 fmt.audio.i_frame_length = 4;
107 fmt.audio.i_channels = 2;
108 fmt.audio.i_blockalign = 4;
109 fmt.audio.i_bitspersample = 16;
110 fmt.i_bitrate = RATE * 4;
112 sys->es = es_out_Add (demux->out, &fmt);
113 date_Init (&sys->pts, RATE, 1);
114 date_Set (&sys->pts, 0);
117 unsigned n = gme_track_count (sys->emu);
118 sys->titlev = malloc (n * sizeof (*sys->titlev));
119 if (unlikely(sys->titlev == NULL))
122 for (unsigned i = 0; i < n; i++)
124 input_title_t *title = vlc_input_title_New ();
125 sys->titlev[i] = title;
126 if (unlikely(title == NULL))
130 if (gme_track_info (sys->emu, &infos, i))
132 msg_Dbg (obj, "track %u: %s %d ms", i, infos->song, infos->length);
133 if (infos->length != -1)
134 title->i_length = infos->length * INT64_C(1000);
136 title->psz_name = strdup (infos->song);
137 gme_free_info (infos);
141 demux->pf_demux = Demux;
142 demux->pf_control = Control;
148 static void Close (vlc_object_t *obj)
150 demux_t *demux = (demux_t *)obj;
151 demux_sys_t *sys = demux->p_sys;
153 for (unsigned i = 0, n = sys->titlec; i < n; i++)
154 vlc_input_title_Delete (sys->titlev[i]);
156 gme_delete (sys->emu);
161 static gme_err_t Reader (void *data, void *buf, int length)
165 if (stream_Read (s, buf, length) < length)
171 #define SAMPLES (RATE / 10)
173 static int Demux (demux_t *demux)
175 demux_sys_t *sys = demux->p_sys;
178 if (gme_track_ended (sys->emu))
180 msg_Dbg (demux, "track %u ended", sys->track_id);
181 if (++sys->track_id >= (unsigned)gme_track_count (sys->emu))
184 demux->info.i_update |= INPUT_UPDATE_TITLE;
185 demux->info.i_title = sys->track_id;
186 gme_start_track (sys->emu, sys->track_id);
190 block_t *block = block_Alloc (2 * 2 * SAMPLES);
191 if (unlikely(block == NULL))
194 gme_err_t ret = gme_play (sys->emu, 2 * SAMPLES, (void *)block->p_buffer);
197 block_Release (block);
198 msg_Err (demux, "%s", ret);
202 block->i_pts = block->i_dts = VLC_TS_0 + date_Get (&sys->pts);
203 es_out_Control (demux->out, ES_OUT_SET_PCR, block->i_pts);
204 es_out_Send (demux->out, sys->es, block);
205 date_Increment (&sys->pts, SAMPLES);
210 static int Control (demux_t *demux, int query, va_list args)
212 demux_sys_t *sys = demux->p_sys;
216 case DEMUX_GET_POSITION:
218 double *pos = va_arg (args, double *);
220 if (unlikely(sys->track_id >= sys->titlec)
221 || (sys->titlev[sys->track_id]->i_length == 0))
224 *pos = (double)(gme_tell (sys->emu))
225 / (double)(sys->titlev[sys->track_id]->i_length / 1000);
229 case DEMUX_SET_POSITION:
231 double pos = va_arg (args, double);
233 if (unlikely(sys->track_id >= sys->titlec)
234 || (sys->titlev[sys->track_id]->i_length == 0))
237 int seek = (sys->titlev[sys->track_id]->i_length / 1000) * pos;
238 if (seek > INT_MAX || gme_seek (sys->emu, seek))
243 case DEMUX_GET_LENGTH:
245 int64_t *v = va_arg (args, int64_t *);
247 if (unlikely(sys->track_id >= sys->titlec)
248 || (sys->titlev[sys->track_id]->i_length == 0))
250 *v = sys->titlev[sys->track_id]->i_length;
256 int64_t *v = va_arg (args, int64_t *);
257 *v = gme_tell (sys->emu) * INT64_C(1000);
263 int64_t v = va_arg (args, int64_t) / 1000;
264 if (v > INT_MAX || gme_seek (sys->emu, v))
269 case DEMUX_GET_TITLE_INFO:
271 input_title_t ***titlev = va_arg (args, input_title_t ***);
272 int *titlec = va_arg (args, int *);
273 *(va_arg (args, int *)) = 0; /* Title offset */
274 *(va_arg (args, int *)) = 0; /* Chapter offset */
276 unsigned n = sys->titlec;
277 *titlev = malloc (sizeof (**titlev) * n);
278 if (unlikely(titlev == NULL))
281 for (unsigned i = 0; i < n; i++)
282 (*titlev)[i] = vlc_input_title_Duplicate (sys->titlev[i]);
286 case DEMUX_SET_TITLE:
288 int track_id = va_arg (args, int);
289 if (track_id >= gme_track_count (sys->emu))
291 gme_start_track (sys->emu, track_id);
292 demux->info.i_update |= INPUT_UPDATE_TITLE;
293 demux->info.i_title = track_id;
294 sys->track_id = track_id;