1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: mpegvideo.c,v 1.9 2003/02/26 13:51:36 gbazin Exp $
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Eric Petit <titer@videolan.org>
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 *****************************************************************************/
29 #include <vlc/decoder.h>
30 #include <vlc/input.h>
32 #include "codecs.h" /* WAVEFORMATEX BITMAPINFOHEADER */
34 #include <stdlib.h> /* malloc(), free() */
35 #include <string.h> /* strdup() */
37 /*****************************************************************************
39 *****************************************************************************/
40 typedef struct packetizer_s
42 /* Input properties */
43 decoder_fifo_t *p_fifo;
44 bit_stream_t bit_stream;
46 /* Output properties */
47 sout_input_t *p_sout_input;
48 sout_packet_format_t output_format;
51 mtime_t i_last_ref_pts;
53 int i_progressive_sequence;
54 uint8_t p_sequence_header[150];
55 int i_sequence_header_length;
56 int i_last_sequence_header;
58 int i_last_picture_structure;
61 static int Open ( vlc_object_t * );
62 static int Run ( decoder_fifo_t * );
64 static int InitThread ( packetizer_t * );
65 static void PacketizeThread ( packetizer_t * );
66 static void EndThread ( packetizer_t * );
68 /*****************************************************************************
70 *****************************************************************************/
73 set_description( _("MPEG-I/II video packetizer") );
74 set_capability( "packetizer", 50 );
75 set_callbacks( Open, NULL );
78 /*****************************************************************************
79 * OpenDecoder: probe the packetizer and return score
80 *****************************************************************************
81 * Tries to launch a decoder and return score so that the interface is able
83 *****************************************************************************/
84 static int Open( vlc_object_t *p_this )
86 decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
88 if( p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', 'v') &&
89 p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '1') &&
90 p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '2') )
99 /*****************************************************************************
100 * RunDecoder: this function is called just after the thread is created
101 *****************************************************************************/
102 static int Run( decoder_fifo_t *p_fifo )
104 packetizer_t *p_pack;
107 msg_Info( p_fifo, "Running mpegvideo packetizer" );
108 if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) )
110 msg_Err( p_fifo, "out of memory" );
111 DecoderError( p_fifo );
114 memset( p_pack, 0, sizeof( packetizer_t ) );
116 p_pack->p_fifo = p_fifo;
118 if( InitThread( p_pack ) != 0 )
120 DecoderError( p_fifo );
124 while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
126 PacketizeThread( p_pack );
130 if( ( b_error = p_pack->p_fifo->b_error ) )
132 DecoderError( p_pack->p_fifo );
151 /*****************************************************************************
152 * InitThread: initialize data before entering main loop
153 *****************************************************************************/
155 static int InitThread( packetizer_t *p_pack )
158 p_pack->output_format.i_cat = VIDEO_ES;
159 p_pack->output_format.i_fourcc = VLC_FOURCC( 'm', 'p', 'g', 'v');
161 p_pack->p_sout_input = NULL;
163 if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
164 NULL, NULL ) != VLC_SUCCESS )
166 msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
170 p_pack->i_last_picture_structure = 0x03; /* frame picture */
174 /* from ISO 13818-2 */
175 /* converting frame_rate_code to frame_rate */
176 static const double pd_frame_rates[16] =
178 0, 24000/1001, 24, 25, 30000/1001, 30, 50, 60000/1001, 60,
182 static int CopyUntilNextStartCode( packetizer_t *p_pack,
183 sout_buffer_t *p_sout_buffer,
184 unsigned int *pi_pos )
190 p_sout_buffer->p_buffer[(*pi_pos)++] =
191 GetBits( &p_pack->bit_stream, 8 );
194 if( *pi_pos + 2048 > p_sout_buffer->i_buffer_size )
196 sout_BufferRealloc( p_pack->p_sout_input->p_sout,
198 p_sout_buffer->i_buffer_size + 50 * 1024);
201 } while( ShowBits( &p_pack->bit_stream, 24 ) != 0x01 &&
202 !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error );
207 /*****************************************************************************
208 * PacketizeThread: packetize an unit (here copy a complete pes)
209 *****************************************************************************/
210 static void PacketizeThread( packetizer_t *p_pack )
212 sout_buffer_t *p_sout_buffer = NULL;
215 mtime_t i_duration; /* of the parsed picture */
217 /* needed to calculate pts/dts */
218 int i_temporal_ref = 0;
219 int i_picture_structure = 0x03; /* frame picture */
220 int i_top_field_first = 0;
221 int i_repeat_first_field = 0;
223 if( !p_pack->p_sout_input )
225 byte_t p_temp[512];/* 150 bytes is the maximal size
226 of a sequence_header + sequence_extension */
227 int i_frame_rate_code;
228 BITMAPINFOHEADER *p_bih;
230 p_bih = malloc( sizeof( BITMAPINFOHEADER ) );
231 p_pack->output_format.p_format = (void*)p_bih;
233 /* skip data until we find a sequence_header_code */
234 /* TODO: store skipped somewhere so can send it to the mux
235 * after the input is created */
237 while( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B3 &&
238 !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error )
240 RemoveBits( &p_pack->bit_stream, 8 );
243 msg_Warn( p_pack->p_fifo, "sequence_header_code found (%d skipped)",
246 /* copy the start_code */
248 GetChunk( &p_pack->bit_stream, p_temp, 4 ); i_pos += 4;
250 p_bih->biSize = sizeof( BITMAPINFOHEADER );
251 /* horizontal_size_value */
252 p_bih->biWidth = ShowBits( &p_pack->bit_stream, 12 );
253 /* vertical_size_value */
254 p_bih->biHeight = ShowBits( &p_pack->bit_stream, 24 ) & 0xFFF;
255 /* frame_rate_code */
256 i_frame_rate_code = ShowBits( &p_pack->bit_stream, 32 ) & 0xF;
258 p_bih->biBitCount = 0;
259 p_bih->biCompression = VLC_FOURCC( 'm', 'p', 'g', '2' );
260 p_bih->biSizeImage = 0;
261 p_bih->biXPelsPerMeter = 0;
262 p_bih->biYPelsPerMeter = 0;
263 p_bih->biClrUsed = 0;
264 p_bih->biClrImportant = 0;
267 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 7 ); i_pos += 7;
269 /* intra_quantiser_matrix [non_intra_quantiser_matrix] */
270 if( ShowBits( &p_pack->bit_stream, 7 ) & 0x1 )
273 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 64 ); i_pos += 64;
275 if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
277 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
280 /* non_intra_quantiser_matrix */
281 else if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
283 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
288 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 1 ); i_pos += 1;
291 /* sequence_extension (10 bytes) */
292 if( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B5 )
294 msg_Dbg( p_pack->p_fifo, "ARRGG no extension_start_code" );
295 p_pack->i_progressive_sequence = 1;
299 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 10 );
300 p_pack->i_progressive_sequence = ( p_temp[i_pos+5]&0x08 ) ? 1 : 0;
305 /* remember sequence_header and sequence_extention */
306 memcpy( p_pack->p_sequence_header, p_temp, i_pos );
307 p_pack->i_sequence_header_length = i_pos;
309 p_pack->d_frame_rate = pd_frame_rates[i_frame_rate_code];
311 msg_Warn( p_pack->p_fifo,
312 "creating input (image size %dx%d, frame rate %.2f)",
313 p_bih->biWidth, p_bih->biHeight, p_pack->d_frame_rate );
315 /* now we have informations to create the input */
316 p_pack->p_sout_input = sout_InputNew( p_pack->p_fifo,
317 &p_pack->output_format );
319 if( !p_pack->p_sout_input )
321 msg_Err( p_pack->p_fifo, "cannot add a new stream" );
325 p_sout_buffer = sout_BufferNew( p_pack->p_sout_input->p_sout,
327 p_sout_buffer->i_size = i_pos;
328 memcpy( p_sout_buffer->p_buffer, p_temp, i_pos );
334 sout_BufferNew( p_pack->p_sout_input->p_sout, 100 * 1024 );
338 p_pack->i_last_sequence_header++;
343 if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
348 i_code = ShowBits( &p_pack->bit_stream, 32 );
350 if( i_code == 0x1B8 ) /* GOP */
352 /* usefull for bad MPEG-1 : repeat the sequence_header
354 if( p_pack->i_last_sequence_header > (int) p_pack->d_frame_rate )
356 memcpy( p_sout_buffer->p_buffer + i_pos,
357 p_pack->p_sequence_header,
358 p_pack->i_sequence_header_length );
359 i_pos += p_pack->i_sequence_header_length;
360 p_pack->i_last_sequence_header = 0;
363 p_pack->i_last_ref_pts =
364 p_pack->i_last_dts + 40000; /* FIXME */
365 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
367 else if( i_code == 0x100 ) /* Picture */
369 /* picture_start_code */
370 GetChunk( &p_pack->bit_stream,
371 p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
372 i_temporal_ref = ShowBits( &p_pack->bit_stream, 10 );
374 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
377 else if( i_code == 0x1b5 )
379 /* extention start code 32 */
380 GetChunk( &p_pack->bit_stream,
381 p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
383 if( ShowBits( &p_pack->bit_stream, 4 ) == 0x08 )
385 /* picture coding extention */
387 /* extention start code identifier(b1000) 4 */
388 /* f_code[2][2] 16 */
389 /* intra_dc_precision 2 */
390 /* picture_structure 2 */
391 /* top_field_first 1 */
392 i_picture_structure =
393 ShowBits( &p_pack->bit_stream, 24 ) & 0x03;
395 ShowBits( &p_pack->bit_stream, 25 ) & 0x01;
396 i_repeat_first_field =
397 ShowBits( &p_pack->bit_stream, 31 ) & 0x01;
399 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
403 if( i_code == 0x1B3 )
405 p_pack->i_last_sequence_header = 0;
407 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
411 sout_BufferRealloc( p_pack->p_sout_input->p_sout,
412 p_sout_buffer, i_pos );
413 p_sout_buffer->i_size = i_pos;
415 /* calculate dts/pts */
416 if( p_pack->i_progressive_sequence || i_picture_structure == 0x03)
418 i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate );
422 i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate / 2);
425 p_sout_buffer->i_dts = p_pack->i_last_dts;
426 p_sout_buffer->i_pts = p_pack->i_last_ref_pts +
427 i_temporal_ref * (mtime_t)( 1000000 / p_pack->d_frame_rate );
428 p_sout_buffer->i_length = i_duration;
429 p_sout_buffer->i_bitrate = (int)( 8 * i_pos * p_pack->d_frame_rate );
430 sout_InputSendBuffer( p_pack->p_sout_input, p_sout_buffer );
432 if( p_pack->i_progressive_sequence )
434 if( i_top_field_first == 0 && i_repeat_first_field == 0 )
436 p_pack->i_last_dts += i_duration;
438 else if( i_top_field_first == 0 && i_repeat_first_field == 1 )
440 p_pack->i_last_dts += 2 * i_duration;
442 else if( i_top_field_first == 1 && i_repeat_first_field == 1 )
444 p_pack->i_last_dts += 3 * i_duration;
449 if( i_picture_structure == 0x03 )
451 p_pack->i_last_dts += i_duration;
453 else if( i_picture_structure == p_pack->i_last_picture_structure )
455 p_pack->i_last_dts += 2 * i_duration;
457 else if( ( !i_top_field_first && i_picture_structure == 0x01 ) ||
458 ( i_top_field_first && i_picture_structure == 0x02 ) )
460 p_pack->i_last_dts += 2 * i_duration;
463 p_pack->i_last_picture_structure = i_picture_structure;
467 /*****************************************************************************
468 * EndThread : packetizer thread destruction
469 *****************************************************************************/
470 static void EndThread ( packetizer_t *p_pack)
472 if( p_pack->p_sout_input )
474 sout_InputDelete( p_pack->p_sout_input );