libmpeg2.c 25.1 KB
Newer Older
gbazin's avatar
   
gbazin committed
1
2
3
/*****************************************************************************
 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
 *****************************************************************************
4
 * Copyright (C) 1999-2001 the VideoLAN team
5
 * $Id$
gbazin's avatar
   
gbazin committed
6
 *
7
 * Authors: Gildas Bazin <gbazin@videolan.org>
gbazin's avatar
   
gbazin committed
8
 *          Christophe Massiot <massiot@via.ecp.fr>
gbazin's avatar
   
gbazin committed
9
10
11
12
13
 *
 * This program 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.
Sam Hocevar's avatar
Sam Hocevar committed
14
 *
gbazin's avatar
   
gbazin committed
15
16
17
18
19
20
21
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
dionoea's avatar
dionoea committed
22
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
gbazin's avatar
   
gbazin committed
23
24
25
26
27
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
28
29
30
31
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

gbazin's avatar
   
gbazin committed
32
#include <vlc/vlc.h>
33
#include <vlc_plugin.h>
zorglub's avatar
zorglub committed
34
35
#include <vlc_vout.h>
#include <vlc_codec.h>
gbazin's avatar
   
gbazin committed
36
37
38

#include <mpeg2dec/mpeg2.h>

39
#include <vlc_codec_synchro.h>
40

gbazin's avatar
   
gbazin committed
41
42
/* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
#define AR_SQUARE_PICTURE       1                           /* square pixels */
43
#define AR_4_3_PICTURE          2                        /* 4:3 picture (TV) */
gbazin's avatar
   
gbazin committed
44
45
46
47
#define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
#define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */

/*****************************************************************************
gbazin's avatar
   
gbazin committed
48
 * decoder_sys_t : libmpeg2 decoder descriptor
gbazin's avatar
   
gbazin committed
49
 *****************************************************************************/
gbazin's avatar
   
gbazin committed
50
struct decoder_sys_t
gbazin's avatar
   
gbazin committed
51
52
53
54
55
56
{
    /*
     * libmpeg2 properties
     */
    mpeg2dec_t          *p_mpeg2dec;
    const mpeg2_info_t  *p_info;
57
    bool                b_skip;
gbazin's avatar
   
gbazin committed
58
59
60
61
62
63

    /*
     * Input properties
     */
    mtime_t          i_previous_pts;
    mtime_t          i_current_pts;
64
65
    mtime_t          i_previous_dts;
    mtime_t          i_current_dts;
66
67
    int              i_current_rate;
    picture_t *      p_picture_to_destroy;
68
69
    bool             b_garbage_pic;
    bool             b_after_sequence_header; /* is it the next frame after
70
                                               * the sequence header ?    */
71
72
    bool             b_slice_i;             /* intra-slice refresh stream */
    bool             b_second_field;
gbazin's avatar
   
gbazin committed
73

74
    bool             b_preroll;
Laurent Aimar's avatar
Laurent Aimar committed
75

gbazin's avatar
   
gbazin committed
76
77
78
    /*
     * Output properties
     */
79
    decoder_synchro_t *p_synchro;
80
    int            i_aspect;
81
82
    int            i_sar_num;
    int            i_sar_den;
83
    mtime_t        i_last_frame_pts;
gbazin's avatar
   
gbazin committed
84

gbazin's avatar
   
gbazin committed
85
};
gbazin's avatar
   
gbazin committed
86
87
88
89

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
gbazin's avatar
   
gbazin committed
90
91
92
93
static int  OpenDecoder( vlc_object_t * );
static void CloseDecoder( vlc_object_t * );

static picture_t *DecodeBlock( decoder_t *, block_t ** );
gbazin's avatar
   
gbazin committed
94

gbazin's avatar
   
gbazin committed
95
static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
96
static void GetAR( decoder_t *p_dec );
gbazin's avatar
   
gbazin committed
97

gbazin's avatar
   
gbazin committed
98
99
100
101
102
/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin();
    set_description( _("MPEG I/II video decoder (using libmpeg2)") );
gbazin's avatar
   
gbazin committed
103
    set_capability( "decoder", 150 );
zorglub's avatar
zorglub committed
104
105
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_VCODEC );
gbazin's avatar
   
gbazin committed
106
    set_callbacks( OpenDecoder, CloseDecoder );
gbazin's avatar
   
gbazin committed
107
108
109
110
111
112
113
114
    add_shortcut( "libmpeg2" );
vlc_module_end();

/*****************************************************************************
 * OpenDecoder: probe the decoder and return score
 *****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
{
gbazin's avatar
   
gbazin committed
115
    decoder_t *p_dec = (decoder_t*)p_this;
gbazin's avatar
   
gbazin committed
116
    decoder_sys_t *p_sys;
Sam Hocevar's avatar
Sam Hocevar committed
117
    uint32_t i_accel = 0;
gbazin's avatar
   
gbazin committed
118

gbazin's avatar
   
gbazin committed
119
120
    if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
        p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
gbazin's avatar
   
gbazin committed
121
        /* Pinnacle hardware-mpeg1 */
gbazin's avatar
   
gbazin committed
122
        p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
123
        p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','2','v') &&
124
125
        p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
        p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
gbazin's avatar
   
gbazin committed
126
127
128
129
    {
        return VLC_EGENERIC;
    }

gbazin's avatar
   
gbazin committed
130
    /* Allocate the memory needed to store the decoder's structure */
gbazin's avatar
   
gbazin committed
131
    if( ( p_dec->p_sys = p_sys =
gbazin's avatar
   
gbazin committed
132
          (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
133
        return VLC_ENOMEM;
gbazin's avatar
   
gbazin committed
134
135

    /* Initialize the thread properties */
gbazin's avatar
   
gbazin committed
136
137
138
139
140
141
    memset( p_sys, 0, sizeof(decoder_sys_t) );
    p_sys->p_mpeg2dec = NULL;
    p_sys->p_synchro  = NULL;
    p_sys->p_info     = NULL;
    p_sys->i_current_pts  = 0;
    p_sys->i_previous_pts = 0;
142
143
    p_sys->i_current_dts  = 0;
    p_sys->i_previous_dts = 0;
gbazin's avatar
   
gbazin committed
144
145
146
    p_sys->p_picture_to_destroy = NULL;
    p_sys->b_garbage_pic = 0;
    p_sys->b_slice_i  = 0;
147
    p_sys->b_second_field = 0;
gbazin's avatar
   
gbazin committed
148
    p_sys->b_skip     = 0;
149
    p_sys->b_preroll = false;
gbazin's avatar
   
gbazin committed
150

Christophe Massiot's avatar
Christophe Massiot committed
151
#if defined( __i386__ ) || defined( __x86_64__ )
152
    if( vlc_CPU() & CPU_CAPABILITY_MMX )
Sam Hocevar's avatar
Sam Hocevar committed
153
154
155
156
    {
        i_accel |= MPEG2_ACCEL_X86_MMX;
    }

157
    if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
Sam Hocevar's avatar
Sam Hocevar committed
158
159
160
161
    {
        i_accel |= MPEG2_ACCEL_X86_3DNOW;
    }

162
    if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
Sam Hocevar's avatar
Sam Hocevar committed
163
164
165
166
    {
        i_accel |= MPEG2_ACCEL_X86_MMXEXT;
    }

hartman's avatar
hartman committed
167
#elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
168
    if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
Sam Hocevar's avatar
Sam Hocevar committed
169
170
171
172
173
174
175
176
177
178
179
180
181
    {
        i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
    }

#else
    /* If we do not know this CPU, trust libmpeg2's feature detection */
    i_accel = MPEG2_ACCEL_DETECT;

#endif

    /* Set CPU acceleration features */
    mpeg2_accel( i_accel );

gbazin's avatar
   
gbazin committed
182
    /* Initialize decoder */
gbazin's avatar
   
gbazin committed
183
184
    p_sys->p_mpeg2dec = mpeg2_init();
    if( p_sys->p_mpeg2dec == NULL)
gbazin's avatar
   
gbazin committed
185
186
    {
        msg_Err( p_dec, "mpeg2_init() failed" );
gbazin's avatar
   
gbazin committed
187
        free( p_sys );
gbazin's avatar
   
gbazin committed
188
189
        return VLC_EGENERIC;
    }
gbazin's avatar
   
gbazin committed
190

gbazin's avatar
   
gbazin committed
191
192
193
    p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );

    p_dec->pf_decode_video = DecodeBlock;
gbazin's avatar
   
gbazin committed
194
195
196

    return VLC_SUCCESS;
}
gbazin's avatar
   
gbazin committed
197

gbazin's avatar
   
gbazin committed
198
199
200
/*****************************************************************************
 * RunDecoder: the libmpeg2 decoder
 *****************************************************************************/
gbazin's avatar
   
gbazin committed
201
static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
gbazin's avatar
   
gbazin committed
202
203
204
205
206
{
    decoder_sys_t   *p_sys = p_dec->p_sys;
    mpeg2_state_t   state;
    picture_t       *p_pic;

gbazin's avatar
   
gbazin committed
207
208
209
210
211
    block_t *p_block;

    if( !pp_block || !*pp_block ) return NULL;

    p_block = *pp_block;
gbazin's avatar
   
gbazin committed
212
213

    while( 1 )
gbazin's avatar
   
gbazin committed
214
    {
gbazin's avatar
   
gbazin committed
215
        state = mpeg2_parse( p_sys->p_mpeg2dec );
gbazin's avatar
   
gbazin committed
216
217
218
219

        switch( state )
        {
        case STATE_BUFFER:
gbazin's avatar
   
gbazin committed
220
            if( !p_block->i_buffer )
gbazin's avatar
   
gbazin committed
221
222
            {
                block_Release( p_block );
gbazin's avatar
   
gbazin committed
223
                return NULL;
gbazin's avatar
   
gbazin committed
224
225
            }

226
227
            if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
                                      | BLOCK_FLAG_CORRUPTED)) &&
228
                p_sys->p_synchro &&
229
230
                p_sys->p_info->sequence &&
                p_sys->p_info->sequence->width != (unsigned)-1 )
gbazin's avatar
   
gbazin committed
231
            {
232
                decoder_SynchroReset( p_sys->p_synchro );
gbazin's avatar
   
gbazin committed
233
234
                if( p_sys->p_info->current_fbuf != NULL
                    && p_sys->p_info->current_fbuf->id != NULL )
gbazin's avatar
   
gbazin committed
235
                {
gbazin's avatar
   
gbazin committed
236
237
                    p_sys->b_garbage_pic = 1;
                    p_pic = p_sys->p_info->current_fbuf->id;
gbazin's avatar
   
gbazin committed
238
                }
gbazin's avatar
   
gbazin committed
239
240
241
242
243
244
245
                else
                {
                    uint8_t *buf[3];
                    buf[0] = buf[1] = buf[2] = NULL;
                    if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
                        break;
                    mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
246
                    mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
gbazin's avatar
   
gbazin committed
247
248
249
250
                }
                p_sys->p_picture_to_destroy = p_pic;

                if ( p_sys->b_slice_i )
251
                {
252
                    decoder_SynchroNewPicture( p_sys->p_synchro,
253
254
                        I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
                        p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
255
256
                    decoder_SynchroDecode( p_sys->p_synchro );
                    decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
257
                }
gbazin's avatar
   
gbazin committed
258
            }
259

Laurent Aimar's avatar
Laurent Aimar committed
260
261
            if( p_block->i_flags & BLOCK_FLAG_PREROLL )
            {
262
                p_sys->b_preroll = true;
Laurent Aimar's avatar
Laurent Aimar committed
263
264
265
            }
            else if( p_sys->b_preroll )
            {
266
                p_sys->b_preroll = false;
Laurent Aimar's avatar
Laurent Aimar committed
267
                /* Reset synchro */
268
                decoder_SynchroReset( p_sys->p_synchro );
Laurent Aimar's avatar
Laurent Aimar committed
269
270
            }

271
#ifdef PIC_FLAG_PTS
gbazin's avatar
   
gbazin committed
272
273
274
            if( p_block->i_pts )
            {
                mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
gbazin's avatar
   
gbazin committed
275
276

#else /* New interface */
277
278
            if( p_block->i_pts || p_block->i_dts )
            {
gbazin's avatar
   
gbazin committed
279
                mpeg2_tag_picture( p_sys->p_mpeg2dec,
280
281
                                   (uint32_t)p_block->i_pts,
                                   (uint32_t)p_block->i_dts );
gbazin's avatar
   
gbazin committed
282
#endif
gbazin's avatar
   
gbazin committed
283
284
                p_sys->i_previous_pts = p_sys->i_current_pts;
                p_sys->i_current_pts = p_block->i_pts;
285
286
                p_sys->i_previous_dts = p_sys->i_current_dts;
                p_sys->i_current_dts = p_block->i_dts;
gbazin's avatar
   
gbazin committed
287
288
            }

gbazin's avatar
   
gbazin committed
289
            p_sys->i_current_rate = p_block->i_rate;
gbazin's avatar
   
gbazin committed
290

gbazin's avatar
   
gbazin committed
291
292
293
            mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
                          p_block->p_buffer + p_block->i_buffer );

294
            p_block->i_buffer = 0;
gbazin's avatar
   
gbazin committed
295
296
            break;

297
#ifdef STATE_SEQUENCE_MODIFIED
Marian Durkovic's avatar
Marian Durkovic committed
298
299
300
/* FIXME - the above ifdef is always FALSE, even with libmpeg2-0.5.0
 * Need to improve the implementation to avoid invalid/unref pictures */

301
302
303
        case STATE_SEQUENCE_MODIFIED:
            GetAR( p_dec );
            break;
304
#endif
305

gbazin's avatar
   
gbazin committed
306
        case STATE_SEQUENCE:
gbazin's avatar
   
gbazin committed
307
        {
gbazin's avatar
   
gbazin committed
308
            /* Initialize video output */
gbazin's avatar
   
gbazin committed
309
            uint8_t *buf[3];
310
            buf[0] = buf[1] = buf[2] = NULL;
gbazin's avatar
   
gbazin committed
311

312
            GetAR( p_dec );
gbazin's avatar
   
gbazin committed
313
314

            mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
gbazin's avatar
   
gbazin committed
315
316

            /* Set the first 2 reference frames */
gbazin's avatar
   
gbazin committed
317
            mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
318

gbazin's avatar
   
gbazin committed
319
            if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
320
321
322
323
            {
                block_Release( p_block );
                return NULL;
            }
gbazin's avatar
   
gbazin committed
324

gbazin's avatar
   
gbazin committed
325
            mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
326
            mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
gbazin's avatar
   
gbazin committed
327

328
            /* This picture will never go through display_picture. */
gbazin's avatar
   
gbazin committed
329
330
            p_pic->date = 0;

331
332
            /* For some reason, libmpeg2 will put this pic twice in
             * discard_picture. This can be considered a bug in libmpeg2. */
gbazin's avatar
   
gbazin committed
333
            p_dec->pf_picture_link( p_dec, p_pic );
334

gbazin's avatar
   
gbazin committed
335
            if( p_sys->p_synchro )
336
            {
337
                decoder_SynchroRelease( p_sys->p_synchro );
338
            }
339
            p_sys->p_synchro = decoder_SynchroInit( p_dec,
gbazin's avatar
   
gbazin committed
340
341
342
                (uint32_t)((uint64_t)1001000000 * 27 /
                p_sys->p_info->sequence->frame_period) );
            p_sys->b_after_sequence_header = 1;
gbazin's avatar
   
gbazin committed
343
344
        }
        break;
gbazin's avatar
   
gbazin committed
345

346
        case STATE_PICTURE_2ND:
347
            p_sys->b_second_field = 1;
348
349
            break;

gbazin's avatar
   
gbazin committed
350
351
352
        case STATE_PICTURE:
        {
            uint8_t *buf[3];
353
            mtime_t i_pts, i_dts;
354
355
            buf[0] = buf[1] = buf[2] = NULL;

gbazin's avatar
   
gbazin committed
356
357
358
            if ( p_sys->b_after_sequence_header &&
                 ((p_sys->p_info->current_picture->flags &
                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
359
360
            {
                /* Intra-slice refresh. Simulate a blank I picture. */
gbazin's avatar
   
gbazin committed
361
                msg_Dbg( p_dec, "intra-slice refresh stream" );
362
                decoder_SynchroNewPicture( p_sys->p_synchro,
363
364
                    I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
                    p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
365
366
                decoder_SynchroDecode( p_sys->p_synchro );
                decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
gbazin's avatar
   
gbazin committed
367
                p_sys->b_slice_i = 1;
368
            }
gbazin's avatar
   
gbazin committed
369
370
            p_sys->b_after_sequence_header = 0;

gbazin's avatar
   
gbazin committed
371
#ifdef PIC_FLAG_PTS
gbazin's avatar
   
gbazin committed
372
373
374
375
            i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
                ( ( p_sys->p_info->current_picture->pts ==
                    (uint32_t)p_sys->i_current_pts ) ?
                  p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
376
            i_dts = 0;
gbazin's avatar
   
gbazin committed
377

gbazin's avatar
   
gbazin committed
378
379
380
381
382
383
384
385
386
387
388
389
390
            /* Hack to handle demuxers which only have DTS timestamps */
            if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
            {
                if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
                    (p_sys->p_info->current_picture->flags &
                      PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
                {
                    i_pts = p_block->i_dts;
                }
            }
            p_block->i_pts = p_block->i_dts = 0;
            /* End hack */

391
392
393
394
395
396
397
398
399
400
401
402
#else /* New interface */

            i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
                ( ( p_sys->p_info->current_picture->tag ==
                    (uint32_t)p_sys->i_current_pts ) ?
                  p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
            i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
                ( ( p_sys->p_info->current_picture->tag2 ==
                    (uint32_t)p_sys->i_current_dts ) ?
                  p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
#endif

403
404
            /* If nb_fields == 1, it is a field picture, and it will be
             * followed by another field picture for which we won't call
405
             * decoder_SynchroNewPicture() because this would have other
406
407
408
             * problems, so we take it into account here.
             * This kind of sucks, but I didn't think better. --Meuuh
             */
409
            decoder_SynchroNewPicture( p_sys->p_synchro,
gbazin's avatar
   
gbazin committed
410
                p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
411
                p_sys->p_info->current_picture->nb_fields == 1 ? 2 :
412
                p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
413
414
                p_sys->i_current_rate,
                p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
gbazin's avatar
   
gbazin committed
415

Laurent Aimar's avatar
Laurent Aimar committed
416
            if( !p_dec->b_pace_control && !p_sys->b_preroll &&
417
                !(p_sys->b_slice_i
gbazin's avatar
   
gbazin committed
418
                   && ((p_sys->p_info->current_picture->flags
419
                         & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
420
                   && !decoder_SynchroChoose( p_sys->p_synchro,
gbazin's avatar
   
gbazin committed
421
                              p_sys->p_info->current_picture->flags
gbazin's avatar
   
gbazin committed
422
                                & PIC_MASK_CODING_TYPE,
423
424
                              /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
                              p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
425
            {
gbazin's avatar
   
gbazin committed
426
427
                mpeg2_skip( p_sys->p_mpeg2dec, 1 );
                p_sys->b_skip = 1;
428
                decoder_SynchroTrash( p_sys->p_synchro );
gbazin's avatar
   
gbazin committed
429
                mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
430
431
            }
            else
gbazin's avatar
   
gbazin committed
432
            {
gbazin's avatar
   
gbazin committed
433
434
                mpeg2_skip( p_sys->p_mpeg2dec, 0 );
                p_sys->b_skip = 0;
435
                decoder_SynchroDecode( p_sys->p_synchro );
gbazin's avatar
   
gbazin committed
436
437

                if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
438
439
440
441
                {
                    block_Release( p_block );
                    return NULL;
                }
gbazin's avatar
   
gbazin committed
442

gbazin's avatar
   
gbazin committed
443
                mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
444
        mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
gbazin's avatar
   
gbazin committed
445
446
            }
        }
447
        break;
gbazin's avatar
   
gbazin committed
448
449

        case STATE_END:
450
        case STATE_SLICE:
gbazin's avatar
   
gbazin committed
451
            p_pic = NULL;
gbazin's avatar
   
gbazin committed
452
453
            if( p_sys->p_info->display_fbuf
                && p_sys->p_info->display_fbuf->id )
gbazin's avatar
   
gbazin committed
454
            {
gbazin's avatar
   
gbazin committed
455
                p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
gbazin's avatar
   
gbazin committed
456

457
                decoder_SynchroEnd( p_sys->p_synchro,
gbazin's avatar
   
gbazin committed
458
                            p_sys->p_info->display_picture->flags
459
                             & PIC_MASK_CODING_TYPE,
gbazin's avatar
   
gbazin committed
460
461
                            p_sys->b_garbage_pic );
                p_sys->b_garbage_pic = 0;
462

gbazin's avatar
   
gbazin committed
463
                if ( p_sys->p_picture_to_destroy != p_pic )
464
                {
465
                    p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
466
467
468
                }
                else
                {
gbazin's avatar
   
gbazin committed
469
                    p_sys->p_picture_to_destroy = NULL;
gbazin's avatar
   
gbazin committed
470
                    p_pic->date = 0;
gbazin's avatar
   
gbazin committed
471
                }
472
473
            }

gbazin's avatar
   
gbazin committed
474
475
            if( p_sys->p_info->discard_fbuf &&
                p_sys->p_info->discard_fbuf->id )
476
            {
gbazin's avatar
   
gbazin committed
477
478
                p_dec->pf_picture_unlink( p_dec,
                                          p_sys->p_info->discard_fbuf->id );
gbazin's avatar
   
gbazin committed
479
            }
gbazin's avatar
   
gbazin committed
480

481
            /* For still frames */
482
            if( state == STATE_END && p_pic ) p_pic->b_force = true;
483
484
485
486
487
488
489
490
491
492

            if( p_pic )
            {
                /* Avoid frames with identical timestamps.
                 * Especially needed for still frames in DVD menus. */
                if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
                p_sys->i_last_frame_pts = p_pic->date;

                return p_pic;
            }
gbazin's avatar
   
gbazin committed
493

gbazin's avatar
   
gbazin committed
494
495
            break;

496
        case STATE_INVALID:
497
498
499
500
        {
            uint8_t *buf[3];
            buf[0] = buf[1] = buf[2] = NULL;

gbazin's avatar
   
gbazin committed
501
            msg_Warn( p_dec, "invalid picture encountered" );
Sam Hocevar's avatar
Sam Hocevar committed
502
            if ( ( p_sys->p_info->current_picture == NULL ) ||
gbazin's avatar
   
gbazin committed
503
               ( ( p_sys->p_info->current_picture->flags &
504
                   PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
505
            {
506
                if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro );
507
            }
gbazin's avatar
   
gbazin committed
508
509
            mpeg2_skip( p_sys->p_mpeg2dec, 1 );
            p_sys->b_skip = 1;
510

gbazin's avatar
   
gbazin committed
511
512
            if( p_sys->p_info->current_fbuf &&
                p_sys->p_info->current_fbuf->id )
513
            {
gbazin's avatar
   
gbazin committed
514
515
                p_sys->b_garbage_pic = 1;
                p_pic = p_sys->p_info->current_fbuf->id;
516
            }
517
518
519
520
            else if( !p_sys->p_info->sequence )
            {
                break;
            }
521
522
523
524
            else
            {
                if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
                    break;
gbazin's avatar
   
gbazin committed
525
                mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
526
                mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
527
            }
gbazin's avatar
   
gbazin committed
528
            p_sys->p_picture_to_destroy = p_pic;
529
530

            memset( p_pic->p[0].p_pixels, 0,
gbazin's avatar
   
gbazin committed
531
532
                    p_sys->p_info->sequence->width
                     * p_sys->p_info->sequence->height );
533
            memset( p_pic->p[1].p_pixels, 0x80,
gbazin's avatar
   
gbazin committed
534
535
                    p_sys->p_info->sequence->width
                     * p_sys->p_info->sequence->height / 4 );
536
            memset( p_pic->p[2].p_pixels, 0x80,
gbazin's avatar
   
gbazin committed
537
538
                    p_sys->p_info->sequence->width
                     * p_sys->p_info->sequence->height / 4 );
539

gbazin's avatar
   
gbazin committed
540
            if( p_sys->b_slice_i )
541
            {
542
                decoder_SynchroNewPicture( p_sys->p_synchro,
543
544
                        I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
                        p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
545
546
                decoder_SynchroDecode( p_sys->p_synchro );
                decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
547
            }
548
            break;
549
        }
550

gbazin's avatar
   
gbazin committed
551
552
553
554
555
        default:
            break;
        }
    }

gbazin's avatar
   
gbazin committed
556
557
    /* Never reached */
    return NULL;
gbazin's avatar
   
gbazin committed
558
559
560
}

/*****************************************************************************
gbazin's avatar
   
gbazin committed
561
 * CloseDecoder: libmpeg2 decoder destruction
gbazin's avatar
   
gbazin committed
562
 *****************************************************************************/
gbazin's avatar
   
gbazin committed
563
static void CloseDecoder( vlc_object_t *p_this )
gbazin's avatar
   
gbazin committed
564
{
gbazin's avatar
   
gbazin committed
565
    decoder_t *p_dec = (decoder_t *)p_this;
gbazin's avatar
   
gbazin committed
566
567
    decoder_sys_t *p_sys = p_dec->p_sys;

568
    if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
gbazin's avatar
   
gbazin committed
569

gbazin's avatar
   
gbazin committed
570
    if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
gbazin's avatar
   
gbazin committed
571

gbazin's avatar
   
gbazin committed
572
    free( p_sys );
gbazin's avatar
   
gbazin committed
573
}
gbazin's avatar
   
gbazin committed
574
575
576
577

/*****************************************************************************
 * GetNewPicture: Get a new picture from the vout and set the buf struct
 *****************************************************************************/
gbazin's avatar
   
gbazin committed
578
static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
gbazin's avatar
   
gbazin committed
579
{
gbazin's avatar
   
gbazin committed
580
    decoder_sys_t *p_sys = p_dec->p_sys;
gbazin's avatar
   
gbazin committed
581
    picture_t *p_pic;
gbazin's avatar
   
gbazin committed
582

gbazin's avatar
   
gbazin committed
583
    p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
584
585
    p_dec->fmt_out.video.i_visible_width =
        p_sys->p_info->sequence->picture_width;
gbazin's avatar
   
gbazin committed
586
    p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
587
588
    p_dec->fmt_out.video.i_visible_height =
        p_sys->p_info->sequence->picture_height;
gbazin's avatar
   
gbazin committed
589
    p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
590
591
    p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
    p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
gbazin's avatar
   
gbazin committed
592

593
594
595
596
597
598
599
600
    if( p_sys->p_info->sequence->frame_period > 0 )
    {
        p_dec->fmt_out.video.i_frame_rate =
            (uint32_t)( (uint64_t)1001000000 * 27 /
                        p_sys->p_info->sequence->frame_period );
        p_dec->fmt_out.video.i_frame_rate_base = 1001;
    }

gbazin's avatar
   
gbazin committed
601
602
603
604
    p_dec->fmt_out.i_codec =
        ( p_sys->p_info->sequence->chroma_height <
          p_sys->p_info->sequence->height ) ?
        VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
gbazin's avatar
   
gbazin committed
605

gbazin's avatar
   
gbazin committed
606
607
    /* Get a new picture */
    p_pic = p_dec->pf_vout_buffer_new( p_dec );
gbazin's avatar
   
gbazin committed
608
609
610

    if( p_pic == NULL ) return NULL;

gbazin's avatar
   
gbazin committed
611
612
613
614
615
616
617
    p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
        p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
    p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
        p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
    p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
        p_sys->p_info->current_picture->nb_fields : 2;

gbazin's avatar
   
gbazin committed
618
    p_dec->pf_picture_link( p_dec, p_pic );
gbazin's avatar
   
gbazin committed
619
620
621
622
623
624
625

    pp_buf[0] = p_pic->p[0].p_pixels;
    pp_buf[1] = p_pic->p[1].p_pixels;
    pp_buf[2] = p_pic->p[2].p_pixels;

    return p_pic;
}
626
627
628
629
630
631

/*****************************************************************************
 * GetAR: Get aspect ratio
 *****************************************************************************/
static void GetAR( decoder_t *p_dec )
{
632
    decoder_sys_t *p_sys = p_dec->p_sys;
633
634
635
636
637
638
639
640

    /* Check whether the input gave a particular aspect ratio */
    if( p_dec->fmt_in.video.i_aspect )
    {
        p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
        if( p_sys->i_aspect <= AR_221_1_PICTURE )
        switch( p_sys->i_aspect )
        {
641
        case AR_4_3_PICTURE:
642
            p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
643
644
            p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
            p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
645
646
647
            break;
        case AR_16_9_PICTURE:
            p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
648
649
            p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 16;
            p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 9;
650
651
652
            break;
        case AR_221_1_PICTURE:
            p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
653
654
            p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 221;
            p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 100;
655
656
657
            break;
        case AR_SQUARE_PICTURE:
            p_sys->i_aspect = VOUT_ASPECT_FACTOR *
658
659
                           p_sys->p_info->sequence->picture_width /
                           p_sys->p_info->sequence->picture_height;
660
            p_sys->i_sar_num = p_sys->i_sar_den = 1;
661
662
663
664
665
666
667
668
669
            break;
        }
    }
    else
    {
        /* Use the value provided in the MPEG sequence header */
        if( p_sys->p_info->sequence->pixel_height > 0 )
        {
            p_sys->i_aspect =
670
                ((uint64_t)p_sys->p_info->sequence->picture_width) *
671
672
                p_sys->p_info->sequence->pixel_width *
                VOUT_ASPECT_FACTOR /
673
                p_sys->p_info->sequence->picture_height /
674
                p_sys->p_info->sequence->pixel_height;
675
676
            p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
            p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
677
678
679
680
681
682
683
        }
        else
        {
            /* Invalid aspect, assume 4:3.
             * This shouldn't happen and if it does it is a bug
             * in libmpeg2 (likely triggered by an invalid stream) */
            p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
684
685
            p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
            p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
686
687
688
        }
    }

689
690
691
    msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
             p_sys->p_info->sequence->picture_width,
             p_sys->p_info->sequence->picture_height,
692
             p_sys->p_info->sequence->display_width,
693
694
             p_sys->p_info->sequence->display_height,
             p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
695
696
697
698
699
             (uint32_t)((uint64_t)1001000000 * 27 /
                 p_sys->p_info->sequence->frame_period / 1001),
             (uint32_t)((uint64_t)1001000000 * 27 /
                 p_sys->p_info->sequence->frame_period % 1001) );
}