1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: libmpeg2.c,v 1.34 2003/11/22 23:39:14 fenrir Exp $
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
8 * Christophe Massiot <massiot@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <vlc/decoder.h>
32 #include <mpeg2dec/mpeg2.h>
34 #include "vout_synchro.h"
36 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
37 #define AR_SQUARE_PICTURE 1 /* square pixels */
38 #define AR_3_4_PICTURE 2 /* 3:4 picture (TV) */
39 #define AR_16_9_PICTURE 3 /* 16:9 picture (wide screen) */
40 #define AR_221_1_PICTURE 4 /* 2.21:1 picture (movie) */
42 /*****************************************************************************
43 * decoder_sys_t : libmpeg2 decoder descriptor
44 *****************************************************************************/
50 mpeg2dec_t *p_mpeg2dec;
51 const mpeg2_info_t *p_info;
57 pes_packet_t *p_pes; /* current PES we are decoding */
59 mtime_t i_previous_pts;
60 mtime_t i_current_pts;
62 picture_t * p_picture_to_destroy;
63 vlc_bool_t b_garbage_pic;
64 vlc_bool_t b_after_sequence_header; /* is it the next frame after
65 * the sequence header ? */
66 vlc_bool_t b_slice_i; /* intra-slice refresh stream */
71 vout_synchro_t *p_synchro;
76 /*****************************************************************************
78 *****************************************************************************/
79 static int OpenDecoder( vlc_object_t * );
80 static void CloseDecoder( vlc_object_t * );
82 static picture_t *DecodeBlock( decoder_t *, block_t ** );
84 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
86 /*****************************************************************************
88 *****************************************************************************/
90 set_description( _("MPEG I/II video decoder (using libmpeg2)") );
91 set_capability( "decoder", 150 );
92 set_callbacks( OpenDecoder, CloseDecoder );
93 add_shortcut( "libmpeg2" );
96 /*****************************************************************************
97 * OpenDecoder: probe the decoder and return score
98 *****************************************************************************/
99 static int OpenDecoder( vlc_object_t *p_this )
101 decoder_t *p_dec = (decoder_t*)p_this;
102 decoder_sys_t *p_sys;
104 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
105 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
106 /* Pinnacle hardware-mpeg1 */
107 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
109 p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
110 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
115 /* Allocate the memory needed to store the decoder's structure */
116 if( ( p_dec->p_sys = p_sys =
117 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
119 msg_Err( p_dec, "out of memory" );
123 /* Initialize the thread properties */
124 memset( p_sys, 0, sizeof(decoder_sys_t) );
126 p_sys->p_mpeg2dec = NULL;
127 p_sys->p_synchro = NULL;
128 p_sys->p_info = NULL;
129 p_sys->i_pts = mdate() + DEFAULT_PTS_DELAY;
130 p_sys->i_current_pts = 0;
131 p_sys->i_previous_pts = 0;
132 p_sys->p_picture_to_destroy = NULL;
133 p_sys->b_garbage_pic = 0;
134 p_sys->b_slice_i = 0;
137 /* Initialize decoder */
138 p_sys->p_mpeg2dec = mpeg2_init();
139 if( p_sys->p_mpeg2dec == NULL)
141 msg_Err( p_dec, "mpeg2_init() failed" );
146 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
148 p_dec->pf_decode_video = DecodeBlock;
153 /*****************************************************************************
154 * RunDecoder: the libmpeg2 decoder
155 *****************************************************************************/
156 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
158 decoder_sys_t *p_sys = p_dec->p_sys;
164 if( !pp_block || !*pp_block ) return NULL;
170 state = mpeg2_parse( p_sys->p_mpeg2dec );
175 if( !p_block->i_buffer )
177 block_Release( p_block );
181 if( p_block->b_discontinuity && p_sys->p_synchro
182 && p_sys->p_info->sequence->width != (unsigned)-1 )
184 vout_SynchroReset( p_sys->p_synchro );
185 if( p_sys->p_info->current_fbuf != NULL
186 && p_sys->p_info->current_fbuf->id != NULL )
188 p_sys->b_garbage_pic = 1;
189 p_pic = p_sys->p_info->current_fbuf->id;
194 buf[0] = buf[1] = buf[2] = NULL;
195 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
197 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
199 p_sys->p_picture_to_destroy = p_pic;
201 if ( p_sys->b_slice_i )
203 vout_SynchroNewPicture( p_sys->p_synchro,
204 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
205 vout_SynchroDecode( p_sys->p_synchro );
206 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
212 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
213 p_sys->i_previous_pts = p_sys->i_current_pts;
214 p_sys->i_current_pts = p_block->i_pts;
217 p_sys->i_current_rate = DEFAULT_RATE;//p_pes->i_rate;
219 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
220 p_block->p_buffer + p_block->i_buffer );
222 p_block->i_buffer = 0;
227 /* Initialize video output */
229 buf[0] = buf[1] = buf[2] = NULL;
231 /* Check whether the input gave a particular aspect ratio */
232 if( p_dec->fmt_in.video.i_aspect )
234 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
235 switch( p_sys->i_aspect )
238 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
240 case AR_16_9_PICTURE:
241 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
243 case AR_221_1_PICTURE:
244 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
246 case AR_SQUARE_PICTURE:
248 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
249 p_sys->p_info->sequence->width /
250 p_sys->p_info->sequence->height;
256 /* Use the value provided in the MPEG sequence header */
258 ((uint64_t)p_sys->p_info->sequence->display_width) *
259 p_sys->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
260 p_sys->p_info->sequence->display_height /
261 p_sys->p_info->sequence->pixel_height;
264 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
265 p_sys->p_info->sequence->width,
266 p_sys->p_info->sequence->height, p_sys->i_aspect,
267 (uint32_t)((uint64_t)1001000000 * 27 /
268 p_sys->p_info->sequence->frame_period / 1001),
269 (uint32_t)((uint64_t)1001000000 * 27 /
270 p_sys->p_info->sequence->frame_period % 1001) );
272 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
274 /* Set the first 2 reference frames */
275 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
277 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
279 block_Release( p_block );
283 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
285 /* This picture will never go through display_picture. */
288 /* For some reason, libmpeg2 will put this pic twice in
289 * discard_picture. This can be considered a bug in libmpeg2. */
290 //vout_LinkPicture( p_sys->p_vout, p_pic );
292 if( p_sys->p_synchro )
294 vout_SynchroRelease( p_sys->p_synchro );
296 p_sys->p_synchro = vout_SynchroInit( p_dec,
297 (uint32_t)((uint64_t)1001000000 * 27 /
298 p_sys->p_info->sequence->frame_period) );
299 p_sys->b_after_sequence_header = 1;
303 case STATE_PICTURE_2ND:
304 vout_SynchroNewPicture( p_sys->p_synchro,
305 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
306 p_sys->p_info->current_picture->nb_fields,
307 0, 0, p_sys->i_current_rate );
311 vout_SynchroTrash( p_sys->p_synchro );
315 vout_SynchroDecode( p_sys->p_synchro );
322 buf[0] = buf[1] = buf[2] = NULL;
324 if ( p_sys->b_after_sequence_header &&
325 ((p_sys->p_info->current_picture->flags &
326 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
328 /* Intra-slice refresh. Simulate a blank I picture. */
329 msg_Dbg( p_dec, "intra-slice refresh stream" );
330 vout_SynchroNewPicture( p_sys->p_synchro,
331 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
332 vout_SynchroDecode( p_sys->p_synchro );
333 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
334 p_sys->b_slice_i = 1;
336 p_sys->b_after_sequence_header = 0;
338 vout_SynchroNewPicture( p_sys->p_synchro,
339 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
340 p_sys->p_info->current_picture->nb_fields,
341 (p_sys->p_info->current_picture->flags & PIC_FLAG_PTS) ?
342 ( ( p_sys->p_info->current_picture->pts ==
343 (uint32_t)p_sys->i_current_pts ) ?
344 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0,
345 0, p_sys->i_current_rate );
347 if ( !(p_sys->b_slice_i
348 && ((p_sys->p_info->current_picture->flags
349 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
350 && !vout_SynchroChoose( p_sys->p_synchro,
351 p_sys->p_info->current_picture->flags
352 & PIC_MASK_CODING_TYPE,
353 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/ ) )
355 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
357 vout_SynchroTrash( p_sys->p_synchro );
358 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
362 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
364 vout_SynchroDecode( p_sys->p_synchro );
366 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
368 block_Release( p_block );
372 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
379 if( p_sys->p_info->display_fbuf
380 && p_sys->p_info->display_fbuf->id )
382 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
384 vout_SynchroEnd( p_sys->p_synchro,
385 p_sys->p_info->display_picture->flags
386 & PIC_MASK_CODING_TYPE,
387 p_sys->b_garbage_pic );
388 p_sys->b_garbage_pic = 0;
390 if ( p_sys->p_picture_to_destroy != p_pic )
392 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
396 p_sys->p_picture_to_destroy = NULL;
399 return p_pic; /* FIXME */
402 if( p_sys->p_info->discard_fbuf &&
403 p_sys->p_info->discard_fbuf->id )
405 //p_pic = (picture_t *)p_sys->p_info->discard_fbuf->id;
406 //vout_UnlinkPicture( p_sys->p_vout, p_pic );
409 //return p_pic; /* FIXME */
416 buf[0] = buf[1] = buf[2] = NULL;
418 msg_Warn( p_dec, "invalid picture encountered" );
419 if ( ( p_sys->p_info->current_picture == NULL ) ||
420 ( ( p_sys->p_info->current_picture->flags &
421 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
423 vout_SynchroReset( p_sys->p_synchro );
425 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
428 if( p_sys->p_info->current_fbuf &&
429 p_sys->p_info->current_fbuf->id )
431 p_sys->b_garbage_pic = 1;
432 p_pic = p_sys->p_info->current_fbuf->id;
436 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
438 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
440 p_sys->p_picture_to_destroy = p_pic;
442 memset( p_pic->p[0].p_pixels, 0,
443 p_sys->p_info->sequence->width
444 * p_sys->p_info->sequence->height );
445 memset( p_pic->p[1].p_pixels, 0x80,
446 p_sys->p_info->sequence->width
447 * p_sys->p_info->sequence->height / 4 );
448 memset( p_pic->p[2].p_pixels, 0x80,
449 p_sys->p_info->sequence->width
450 * p_sys->p_info->sequence->height / 4 );
452 if( p_sys->b_slice_i )
454 vout_SynchroNewPicture( p_sys->p_synchro,
455 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
456 vout_SynchroDecode( p_sys->p_synchro );
457 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
471 /*****************************************************************************
472 * CloseDecoder: libmpeg2 decoder destruction
473 *****************************************************************************/
474 static void CloseDecoder( vlc_object_t *p_this )
476 decoder_t *p_dec = (decoder_t *)p_this;
477 decoder_sys_t *p_sys = p_dec->p_sys;
479 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
481 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
486 /*****************************************************************************
487 * GetNewPicture: Get a new picture from the vout and set the buf struct
488 *****************************************************************************/
489 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
491 decoder_sys_t *p_sys = p_dec->p_sys;
494 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
495 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
496 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
498 p_dec->fmt_out.i_codec =
499 ( p_sys->p_info->sequence->chroma_height <
500 p_sys->p_info->sequence->height ) ?
501 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
503 /* Get a new picture */
504 p_pic = p_dec->pf_vout_buffer_new( p_dec );
506 if( p_pic == NULL ) return NULL;
508 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
509 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
510 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
511 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
512 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
513 p_sys->p_info->current_picture->nb_fields : 2;
515 //vout_LinkPicture( p_sys->p_vout, p_pic );
517 pp_buf[0] = p_pic->p[0].p_pixels;
518 pp_buf[1] = p_pic->p[1].p_pixels;
519 pp_buf[2] = p_pic->p[2].p_pixels;