1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: libmpeg2.c,v 1.6 2003/03/30 18:14:36 gbazin Exp $
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
29 #include <vlc/input.h>
30 #include <vlc/decoder.h>
32 #include <stdlib.h> /* malloc(), free() */
33 #include <string.h> /* memcpy(), memset() */
35 #include <mpeg2dec/mpeg2.h>
37 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
38 #define AR_SQUARE_PICTURE 1 /* square pixels */
39 #define AR_3_4_PICTURE 2 /* 3:4 picture (TV) */
40 #define AR_16_9_PICTURE 3 /* 16:9 picture (wide screen) */
41 #define AR_221_1_PICTURE 4 /* 2.21:1 picture (movie) */
43 /*****************************************************************************
44 * dec_thread_t : libmpeg2 decoder thread descriptor
45 *****************************************************************************/
46 typedef struct dec_thread_t
51 mpeg2dec_t *p_mpeg2dec;
52 const mpeg2_info_t *p_info;
57 decoder_fifo_t *p_fifo; /* stores the PES stream data */
58 pes_packet_t *p_pes; /* current PES we are decoding */
60 mtime_t i_previous_pts;
61 mtime_t i_current_pts;
62 mtime_t i_period_remainder;
67 vout_thread_t *p_vout;
71 /*****************************************************************************
73 *****************************************************************************/
74 static int OpenDecoder ( vlc_object_t * );
75 static int RunDecoder ( decoder_fifo_t * );
76 static void CloseDecoder ( dec_thread_t * );
78 /*****************************************************************************
80 *****************************************************************************/
82 set_description( _("MPEG I/II video decoder (using libmpeg2)") );
83 set_capability( "decoder", 40 );
84 set_callbacks( OpenDecoder, NULL );
85 add_shortcut( "libmpeg2" );
88 /*****************************************************************************
89 * OpenDecoder: probe the decoder and return score
90 *****************************************************************************/
91 static int OpenDecoder( vlc_object_t *p_this )
93 decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
95 if( p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') )
100 p_fifo->pf_run = RunDecoder;
103 /*****************************************************************************
104 * RunDecoder: the libmpeg2 decoder
105 *****************************************************************************/
106 static int RunDecoder( decoder_fifo_t *p_fifo )
109 data_packet_t *p_data = NULL;
112 int i_aspect, i_chroma;
114 /* Allocate the memory needed to store the thread's structure */
115 if( (p_dec = (dec_thread_t *)malloc (sizeof(dec_thread_t)) )
118 msg_Err( p_fifo, "out of memory" );
122 /* Initialize the thread properties */
123 memset( p_dec, 0, sizeof(dec_thread_t) );
124 p_dec->p_fifo = p_fifo;
126 p_dec->p_vout = NULL;
127 p_dec->p_mpeg2dec = NULL;
128 p_dec->p_info = NULL;
129 p_dec->i_pts = mdate() + DEFAULT_PTS_DELAY;
130 p_dec->i_current_pts = 0;
131 p_dec->i_previous_pts = 0;
132 p_dec->i_period_remainder = 0;
134 /* Initialize decoder */
135 p_dec->p_mpeg2dec = mpeg2_init();
136 if( p_dec->p_mpeg2dec == NULL)
139 p_dec->p_info = mpeg2_info( p_dec->p_mpeg2dec );
141 /* libmpeg2 decoder thread's main loop */
142 while( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )
144 state = mpeg2_parse( p_dec->p_mpeg2dec );
149 /* Feed libmpeg2 a data packet at a time */
152 /* Get the next PES */
154 input_DeletePES( p_dec->p_fifo->p_packets_mgt,
157 input_ExtractPES( p_dec->p_fifo, &p_dec->p_pes );
160 p_dec->p_fifo->b_error = 1;
164 if( p_dec->p_pes->i_pts )
166 mpeg2_pts( p_dec->p_mpeg2dec,
167 (uint32_t)p_dec->p_pes->i_pts );
168 p_dec->i_previous_pts = p_dec->i_current_pts;
169 p_dec->i_current_pts = p_dec->p_pes->i_pts;
171 p_data = p_dec->p_pes->p_first;
176 mpeg2_buffer( p_dec->p_mpeg2dec,
177 p_data->p_payload_start,
178 p_data->p_payload_end );
180 p_data = p_data->p_next;
185 /* Initialize video output */
187 /* Check whether the input gives a particular aspect ratio */
188 if( p_dec->p_fifo->p_demux_data
189 && ( *(int*)(p_dec->p_fifo->p_demux_data) & 0x7 ) )
191 i_aspect = *(int*)(p_dec->p_fifo->p_demux_data);
195 i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
197 case AR_16_9_PICTURE:
198 i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
200 case AR_221_1_PICTURE:
201 i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
203 case AR_SQUARE_PICTURE:
205 i_aspect = VOUT_ASPECT_FACTOR *
206 p_dec->p_info->sequence->width /
207 p_dec->p_info->sequence->height;
213 /* Use the value provided in the MPEG sequence header */
214 i_aspect = ((uint64_t)p_dec->p_info->sequence->width) *
215 p_dec->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
216 p_dec->p_info->sequence->height /
217 p_dec->p_info->sequence->pixel_height;
220 i_chroma = VLC_FOURCC('Y','V','1','2');
222 p_dec->p_vout = vout_Request( p_dec->p_fifo, p_dec->p_vout,
223 p_dec->p_info->sequence->width,
224 p_dec->p_info->sequence->height,
225 i_chroma, i_aspect );
232 /* Get a new picture */
233 while( !(p_pic = vout_CreatePicture( p_dec->p_vout, 0, 0, 0 ) ) )
235 if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )
238 msleep( VOUT_OUTMEM_SLEEP );
243 buf[0] = p_pic->p[0].p_pixels;
244 buf[1] = p_pic->p[1].p_pixels;
245 buf[2] = p_pic->p[2].p_pixels;
246 mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
248 /* Store the date for the picture */
249 if( p_dec->p_info->current_picture->flags & PIC_FLAG_PTS )
251 p_pic->date = ( p_dec->p_info->current_picture->pts ==
252 (uint32_t)p_dec->i_current_pts ) ?
253 p_dec->i_current_pts : p_dec->i_previous_pts;
260 if( p_dec->p_info->display_fbuf
261 && p_dec->p_info->display_fbuf->id )
263 p_pic = (picture_t *)p_dec->p_info->display_fbuf->id;
265 /* Date the new picture */
266 if( p_dec->p_info->display_picture->flags & PIC_FLAG_PTS )
268 p_dec->i_pts = p_pic->date;
269 p_dec->i_period_remainder = 0;
273 p_dec->i_pts += ( (p_dec->p_info->sequence->frame_period +
274 p_dec->i_period_remainder) / 27 );
275 p_dec->i_period_remainder =
276 p_dec->p_info->sequence->frame_period +
277 p_dec->i_period_remainder -
278 ( p_dec->p_info->sequence->frame_period +
279 p_dec->i_period_remainder ) / 27 * 27;
281 vout_DatePicture( p_dec->p_vout, p_pic, p_dec->i_pts );
283 vout_DisplayPicture( p_dec->p_vout, p_pic );
285 /* Handle pulldown by adding some delay to the pts of the next
287 if( p_dec->p_info->display_picture->nb_fields > 2 )
289 int i_repeat_fields =
290 p_dec->p_info->display_picture->nb_fields - 2;
292 p_dec->i_pts += ( (p_dec->p_info->sequence->frame_period +
293 p_dec->i_period_remainder)
294 / 27 / 2 * i_repeat_fields );
295 p_dec->i_period_remainder =
296 p_dec->p_info->sequence->frame_period +
297 p_dec->i_period_remainder -
298 ( p_dec->p_info->sequence->frame_period +
299 p_dec->i_period_remainder ) / 27 / 2 * 27 * 2;
309 /* If b_error is set, the libmpeg2 decoder thread enters the error loop */
310 if( p_dec->p_fifo->b_error )
312 DecoderError( p_dec->p_fifo );
315 /* End of the libmpeg2 decoder thread */
316 CloseDecoder( p_dec );
321 DecoderError( p_fifo );
325 p_dec->p_fifo->b_error = 1;
327 /* End of the libmpeg2 decoder thread */
328 CloseDecoder( p_dec );
334 /*****************************************************************************
335 * CloseDecoder: libmpeg2 decoder destruction
336 *****************************************************************************/
337 static void CloseDecoder( dec_thread_t * p_dec )
342 input_DeletePES( p_dec->p_fifo->p_packets_mgt, p_dec->p_pes );
344 vout_Request( p_dec->p_fifo, p_dec->p_vout, 0, 0, 0, 0 );
346 if( p_dec->p_mpeg2dec ) mpeg2_close( p_dec->p_mpeg2dec );