1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
|
/*
* MNG file demuxer for MPlayer
*
* Copyright (C) 2008 Stefan Schuermans <stefan blinkenarea org>
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream/stream.h"
#include "demuxer.h"
#include "stheader.h"
#define MNG_SUPPORT_READ
#define MNG_SUPPORT_DISPLAY
#include <libmng.h>
/**
* \brief some small fixed start time > 0
*
* Start time must be > 0 for the variable frame time mechanism
* (GIF, MATROSKA, MNG) in video.c to work for the first frame.
*/
#define MNG_START_PTS 0.01f
/**
* \brief private context structure
*
* This structure is used as private data for MPlayer demuxer
* and also as private data for the MNG library.
*
* All members ending in \p _ms are in milliseconds
*/
typedef struct {
stream_t * stream; ///< pointer to MNG data input stream
mng_handle h_mng; ///< MNG library image handle
int header_processed; ///< if MNG image header is processed
mng_uint32 width; ///< MNG image width
mng_uint32 height; ///< MNG image height
int total_time_ms; ///< total MNG animation time
unsigned char * canvas; /**< \brief canvas to draw the image onto
* \details
* \li lines top-down
* \li pixels left-to-right
* \li channels RGB
* \li no padding
* \li NULL if no canvas yet
*/
int displaying; /**< \brief if displaying already,
* i.e. if mng_display has
* already been called
*/
int finished; ///< if animation is finished
int global_time_ms; ///< current global time for MNG library
int anim_cur_time_ms; ///< current frame time in MNG animation
int anim_frame_duration_ms; ///< current frame duration in MNG animation
int show_cur_time_ms; /**< \brief current time in the show process,
* i.e. time of last demux packet
*/
int show_next_time_ms; /**< \brief next time in the show process,
* i.e. time of next demux packet
*/
int timer_ms; /**< \brief number of milliseconds after which
* libmng wants to be called again
*/
} mng_priv_t;
/**
* \brief MNG library callback: Allocate a new zero-filled memory block.
* \param[in] size memory block size
* \return pointer to new memory block
*/
static mng_ptr demux_mng_alloc(mng_size_t size)
{
return calloc(1, size);
}
/**
* \brief MNG library callback: Free memory block.
* \param[in] ptr pointer to memory block
* \param[in] size memory block size
*/
static void demux_mng_free(mng_ptr ptr, mng_size_t size)
{
free(ptr);
}
/**
* \brief MNG library callback: Open MNG stream.
* \param[in] h_mng MNG library image handle
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_openstream(mng_handle h_mng)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
stream_t * stream = mng_priv->stream;
// rewind stream to the beginning
stream_seek(stream, stream->start_pos);
return MNG_TRUE;
}
/**
* \brief MNG library callback: Close MNG stream.
* \param[in] h_mng MNG library image handle
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_closestream(mng_handle h_mng)
{
return MNG_TRUE;
}
/**
* \brief MNG library callback: Read data from stream.
* \param[in] h_mng MNG library image handle
* \param[in] buf pointer to buffer to fill with data
* \param[in] size size of buffer
* \param[out] read number of bytes read from stream
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_readdata(mng_handle h_mng, mng_ptr buf,
mng_uint32 size, mng_uint32 * read)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
stream_t * stream = mng_priv->stream;
// simply read data from stream and return number of bytes or error
*read = stream_read(stream, buf, size);
return MNG_TRUE;
}
/**
* \brief MNG library callback: Header information is processed now.
* \param[in] h_mng MNG library image handle
* \param[in] width image width
* \param[in] height image height
* \return \p MNG_TRUE on success, \p MNG_FALSE on error
*/
static mng_bool demux_mng_processheader(mng_handle h_mng, mng_uint32 width,
mng_uint32 height)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// remember size in private data
mng_priv->header_processed = 1;
mng_priv->width = width;
mng_priv->height = height;
// get total animation time
mng_priv->total_time_ms = mng_get_playtime(h_mng);
// allocate canvas
mng_priv->canvas = malloc(height * width * 4);
if (!mng_priv->canvas) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not allocate canvas of size %dx%d\n",
width, height);
return MNG_FALSE;
}
return MNG_TRUE;
}
/**
* \brief MNG library callback: Get access to a canvas line.
* \param[in] h_mng MNG library image handle
* \param[in] line y coordinate of line to access
* \return pointer to line on success, \p MNG_NULL on error
*/
static mng_ptr demux_mng_getcanvasline(mng_handle h_mng, mng_uint32 line)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// return pointer to canvas line
if (line < mng_priv->height && mng_priv->canvas)
return (mng_ptr)(mng_priv->canvas + line * mng_priv->width * 4);
else
return (mng_ptr)MNG_NULL;
}
/**
* \brief MNG library callback: A part of the canvas should be shown.
*
* This function is called by libmng whenever it thinks a
* rectangular part of the display should be updated. This
* can happen multiple times for a frame and/or a single time
* for a frame. Only the the part of the display occupied by
* the rectangle defined by x, y, width, height is to be updated.
* It is possible that some parts of the display are not updated
* for many frames. There is no chance here to find out if the
* current frame is completed with this update or not.
*
* This mechanism does not match MPlayer's demuxer architecture,
* so it will not be used exactly as intended by libmng.
* A new frame is generated in the demux_mng_fill_buffer() function
* whenever libmng tells us to wait for some time.
*
* \param[in] h_mng MNG library image handle
* \param[in] x rectangle's left edge
* \param[in] y rectangle's top edge
* \param[in] width rectangle's width
* \param[in] height rectangle's heigt
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_refresh(mng_handle h_mng, mng_uint32 x, mng_uint32 y,
mng_uint32 width, mng_uint32 height)
{
// nothing to do here, the image data is already on the canvas
return MNG_TRUE;
}
/**
* \brief MNG library callback: Get how many milliseconds have passed.
* \param[in] h_mng MNG library image handle
* \return global time in milliseconds
*/
static mng_uint32 demux_mng_gettickcount(mng_handle h_mng)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// return current global time
return mng_priv->global_time_ms;
}
/**
* \brief MNG library callback: Please call again after some milliseconds.
* \param[in] h_mng MNG library image handle
* \param[in] msecs number of milliseconds after which to call again
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_settimer(mng_handle h_mng, mng_uint32 msecs)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// Save number of milliseconds after which to call the MNG library again
// in private data.
mng_priv->timer_ms = msecs;
return MNG_TRUE;
}
/**
* \brief MPlayer callback: Check if stream contains MNG data.
* \param[in] demuxer demuxer structure
* \return demuxer type constant, \p 0 if unknown
*/
static int demux_mng_check_file(demuxer_t *demuxer)
{
char buf[4];
if (stream_read(demuxer->stream, buf, 4) != 4)
return 0;
if (memcmp(buf, "\x8AMNG", 4))
return 0;
return DEMUXER_TYPE_MNG;
}
/**
* \brief MPlayer callback: Fill buffer from MNG stream.
* \param[in] demuxer demuxer structure
* \param[in] ds demuxer stream
* \return \p 1 on success, \p 0 on error
*/
static int demux_mng_fill_buffer(demuxer_t * demuxer,
demux_stream_t * ds)
{
mng_priv_t * mng_priv = demuxer->priv;
mng_handle h_mng = mng_priv->h_mng;
mng_retcode mng_ret;
demux_packet_t * dp;
// exit if animation is finished
if (mng_priv->finished)
return 0;
// advance animation to requested next show time
while (mng_priv->anim_cur_time_ms + mng_priv->anim_frame_duration_ms
<= mng_priv->show_next_time_ms && !mng_priv->finished) {
// advance global and animation time
mng_priv->global_time_ms += mng_priv->anim_frame_duration_ms;
mng_priv->anim_cur_time_ms += mng_priv->anim_frame_duration_ms;
// Clear variable MNG library will write number of milliseconds to
// (via settimer callback).
mng_priv->timer_ms = 0;
// get next image from MNG library
if (mng_priv->displaying)
mng_ret = mng_display_resume(h_mng); // resume displaying MNG data
// to canvas
else
mng_ret = mng_display(h_mng); // start displaying MNG data to canvas
if (mng_ret && mng_ret != MNG_NEEDTIMERWAIT) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not display MNG data to canvas: "
"mng_retcode %d\n", mng_ret);
return 0;
}
mng_priv->displaying = 1; // mng_display() has been called now
mng_priv->finished = mng_ret == 0; // animation is finished iff
// mng_display() returned 0
// save current frame duration
mng_priv->anim_frame_duration_ms = mng_priv->timer_ms < 1
? 1 : mng_priv->timer_ms;
} // while (mng_priv->anim_cur_time_ms + ...
// create a new demuxer packet
dp = new_demux_packet(mng_priv->height * mng_priv->width * 4);
// copy image data into demuxer packet
memcpy(dp->buffer, mng_priv->canvas,
mng_priv->height * mng_priv->width * 4);
// set current show time to requested show time
mng_priv->show_cur_time_ms = mng_priv->show_next_time_ms;
// get time of next frame to show
mng_priv->show_next_time_ms = mng_priv->anim_cur_time_ms
+ mng_priv->anim_frame_duration_ms;
// Set position and timing information in demuxer video and demuxer packet.
// - Time must be time of next frame and always be > 0 for the variable
// frame time mechanism (GIF, MATROSKA, MNG) in video.c to work.
demuxer->video->dpos++;
dp->pts = (float)mng_priv->show_next_time_ms / 1000.0f + MNG_START_PTS;
dp->pos = stream_tell(demuxer->stream);
ds_add_packet(demuxer->video, dp);
return 1;
}
/**
* \brief MPlayer callback: Open MNG stream.
* \param[in] demuxer demuxer structure
* \return demuxer structure on success, \p NULL on error
*/
static demuxer_t * demux_mng_open(demuxer_t * demuxer)
{
mng_priv_t * mng_priv;
mng_handle h_mng;
mng_retcode mng_ret;
sh_video_t * sh_video;
// create private data structure
mng_priv = calloc(1, sizeof(mng_priv_t));
//stream pointer into private data
mng_priv->stream = demuxer->stream;
// initialize MNG image instance
h_mng = mng_initialize((mng_ptr)mng_priv, demux_mng_alloc,
demux_mng_free, MNG_NULL);
if (!h_mng) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not initialize MNG image instance\n");
free(mng_priv);
return NULL;
}
// MNG image handle into private data
mng_priv->h_mng = h_mng;
// set required MNG callbacks
if (mng_setcb_openstream(h_mng, demux_mng_openstream) ||
mng_setcb_closestream(h_mng, demux_mng_closestream) ||
mng_setcb_readdata(h_mng, demux_mng_readdata) ||
mng_setcb_processheader(h_mng, demux_mng_processheader) ||
mng_setcb_getcanvasline(h_mng, demux_mng_getcanvasline) ||
mng_setcb_refresh(h_mng, demux_mng_refresh) ||
mng_setcb_gettickcount(h_mng, demux_mng_gettickcount) ||
mng_setcb_settimer(h_mng, demux_mng_settimer) ||
mng_set_canvasstyle(h_mng, MNG_CANVAS_RGBA8)) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not set MNG callbacks\n");
mng_cleanup(&h_mng);
free(mng_priv);
return NULL;
}
// start reading MNG data
mng_ret = mng_read(h_mng);
if (mng_ret) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not start reading MNG data: "
"mng_retcode %d\n", mng_ret);
mng_cleanup(&h_mng);
free(mng_priv);
return NULL;
}
// check that MNG header is processed now
if (!mng_priv->header_processed) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: internal error: header not processed\n");
mng_cleanup(&h_mng);
free(mng_priv);
return NULL;
}
// create a new video stream header
sh_video = new_sh_video(demuxer, 0);
// Make sure the demuxer knows about the new video stream header
// (even though new_sh_video() ought to take care of it).
// (Thanks to demux_gif.c for this.)
demuxer->video->sh = sh_video;
// Make sure that the video demuxer stream header knows about its
// parent video demuxer stream (this is getting wacky), or else
// video_read_properties() will choke.
// (Thanks to demux_gif.c for this.)
sh_video->ds = demuxer->video;
// set format of pixels in video packets
sh_video->format = mmioFOURCC(32, 'B', 'G', 'R');
// set framerate to some value (MNG does not have a fixed framerate)
sh_video->fps = 5.0f;
sh_video->frametime = 1.0f / sh_video->fps;
// set video frame parameters
sh_video->bih = malloc(sizeof(BITMAPINFOHEADER));
sh_video->bih->biCompression = sh_video->format;
sh_video->bih->biWidth = mng_priv->width;
sh_video->bih->biHeight = mng_priv->height;
sh_video->bih->biBitCount = 32;
sh_video->bih->biPlanes = 1;
// Set start time to something > 0.
// - This is required for the variable frame time mechanism
// (GIF, MATROSKA, MNG) in video.c to work for the first frame.
sh_video->ds->pts = MNG_START_PTS;
// set private data in demuxer and return demuxer
demuxer->priv = mng_priv;
return demuxer;
}
/**
* \brief MPlayer callback: Close MNG stream.
* \param[in] demuxer demuxer structure
*/
static void demux_mng_close(demuxer_t* demuxer)
{
mng_priv_t * mng_priv = demuxer->priv;
if (mng_priv) {
// shutdown MNG image instance
if (mng_priv->h_mng)
mng_cleanup(&mng_priv->h_mng);
// free private data
if (mng_priv->canvas)
free(mng_priv->canvas);
free(mng_priv);
}
}
/**
* \brief MPlayer callback: Seek in MNG stream.
* \param[in] demuxer demuxer structure
* \param[in] rel_seek_secs relative seek time in seconds
* \param[in] audio_delay unused, MNG does not contain audio
* \param[in] flags bit flags, \p 1: absolute, \p 2: fractional position
*/
static void demux_mng_seek(demuxer_t * demuxer, float rel_seek_secs,
float audio_delay, int flags)
{
mng_priv_t * mng_priv = demuxer->priv;
mng_handle h_mng = mng_priv->h_mng;
mng_retcode mng_ret;
int seek_ms, pos_ms;
// exit if not ready to seek (header not yet read or not yet displaying)
if (!mng_priv->header_processed || !mng_priv->displaying)
return;
// get number of milliseconds to seek to
if (flags & 2) // seek by fractional position (0.0 ... 1.0)
seek_ms = (int)(rel_seek_secs * (float)mng_priv->total_time_ms);
else // seek by time in seconds
seek_ms = (int)(rel_seek_secs * 1000.0f + 0.5f);
// get new position in milliseconds
if (flags & 1) // absolute
pos_ms = seek_ms;
else // relative
pos_ms = mng_priv->show_cur_time_ms + seek_ms;
// fix position
if (pos_ms < 0)
pos_ms = 0;
if (pos_ms > mng_priv->total_time_ms)
pos_ms = mng_priv->total_time_ms;
// FIXME
// In principle there is a function to seek in MNG: mng_display_gotime().
// - Using it did not work out (documentation is very brief,
// example code does not exist?).
// - The following code works, but its performance is quite bad.
// seeking forward
if (pos_ms >= mng_priv->show_cur_time_ms) {
// Simply advance show time to seek position.
// - Everything else will be handled in demux_mng_fill_buffer().
mng_priv->show_next_time_ms = pos_ms;
} // if (pos_ms > mng_priv->show_time_ms)
// seeking backward
else { // if (pos_ms > mng_priv->show_time_ms)
// Clear variable MNG library will write number of milliseconds to
// (via settimer callback).
mng_priv->timer_ms = 0;
// Restart displaying and advance show time to seek position.
// - Everything else will be handled in demux_mng_fill_buffer().
mng_ret = mng_display_reset(h_mng);
// If a timer wait is needed, fool libmng that requested time
// passed and try again.
if (mng_ret == MNG_NEEDTIMERWAIT) {
mng_priv->global_time_ms += mng_priv->timer_ms;
mng_ret = mng_display_reset(h_mng);
}
if (mng_ret) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not reset MNG display state: "
"mng_retcode %d\n", mng_ret);
return;
}
mng_priv->displaying = 0;
mng_priv->finished = 0;
mng_priv->anim_cur_time_ms = 0;
mng_priv->anim_frame_duration_ms = 0;
mng_priv->show_next_time_ms = pos_ms;
} // if (pos_ms > mng_priv->show_time_ms) ... else
}
/**
* \brief MPlayer callback: Control MNG stream.
* \param[in] demuxer demuxer structure
* \param[in] cmd code of control command to perform
* \param[in,out] arg command argument
* \return demuxer control response code
*/
static int demux_mng_control(demuxer_t * demuxer, int cmd, void * arg)
{
mng_priv_t * mng_priv = demuxer->priv;
switch(cmd) {
// get total movie length
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (mng_priv->header_processed) {
*(double *)arg = (double)mng_priv->total_time_ms / 1000.0;
return DEMUXER_CTRL_OK;
} else {
return DEMUXER_CTRL_DONTKNOW;
}
break;
// get position in movie
case DEMUXER_CTRL_GET_PERCENT_POS:
if (mng_priv->header_processed && mng_priv->total_time_ms > 0) {
*(int *)arg = (100 * mng_priv->show_cur_time_ms
+ mng_priv->total_time_ms / 2)
/ mng_priv->total_time_ms;
return DEMUXER_CTRL_OK;
} else {
return DEMUXER_CTRL_DONTKNOW;
}
break;
default:
return DEMUXER_CTRL_NOTIMPL;
} // switch (cmd)
}
const demuxer_desc_t demuxer_desc_mng = {
"MNG demuxer",
"mng",
"MNG",
"Stefan Schuermans <stefan@blinkenarea.org>",
"MNG files, using libmng",
DEMUXER_TYPE_MNG,
0, // unsafe autodetect (only checking magic at beginning of stream)
demux_mng_check_file,
demux_mng_fill_buffer,
demux_mng_open,
demux_mng_close,
demux_mng_seek,
demux_mng_control
};
|