1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: mpegvideo.c,v 1.8 2003/01/23 15:52:04 sam 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 )
239 RemoveBits( &p_pack->bit_stream, 8 );
242 msg_Warn( p_pack->p_fifo, "sequence_header_code found (%d skipped)",
245 /* copy the start_code */
247 GetChunk( &p_pack->bit_stream, p_temp, 4 ); i_pos += 4;
249 p_bih->biSize = sizeof( BITMAPINFOHEADER );
250 /* horizontal_size_value */
251 p_bih->biWidth = ShowBits( &p_pack->bit_stream, 12 );
252 /* vertical_size_value */
253 p_bih->biHeight = ShowBits( &p_pack->bit_stream, 24 ) & 0xFFF;
254 /* frame_rate_code */
255 i_frame_rate_code = ShowBits( &p_pack->bit_stream, 32 ) & 0xF;
257 p_bih->biBitCount = 0;
258 p_bih->biCompression = VLC_FOURCC( 'm', 'p', 'g', '2' );
259 p_bih->biSizeImage = 0;
260 p_bih->biXPelsPerMeter = 0;
261 p_bih->biYPelsPerMeter = 0;
262 p_bih->biClrUsed = 0;
263 p_bih->biClrImportant = 0;
266 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 7 ); i_pos += 7;
268 /* intra_quantiser_matrix [non_intra_quantiser_matrix] */
269 if( ShowBits( &p_pack->bit_stream, 7 ) & 0x1 )
272 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 64 ); i_pos += 64;
274 if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
276 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
279 /* non_intra_quantiser_matrix */
280 else if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
282 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
287 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 1 ); i_pos += 1;
290 /* sequence_extension (10 bytes) */
291 if( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B5 )
293 msg_Dbg( p_pack->p_fifo, "ARRGG no extension_start_code" );
294 p_pack->i_progressive_sequence = 1;
298 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 10 );
299 p_pack->i_progressive_sequence = ( p_temp[i_pos+5]&0x08 ) ? 1 : 0;
304 /* remember sequence_header and sequence_extention */
305 memcpy( p_pack->p_sequence_header, p_temp, i_pos );
306 p_pack->i_sequence_header_length = i_pos;
308 p_pack->d_frame_rate = pd_frame_rates[i_frame_rate_code];
310 msg_Warn( p_pack->p_fifo,
311 "creating input (image size %dx%d, frame rate %.2f)",
312 p_bih->biWidth, p_bih->biHeight, p_pack->d_frame_rate );
314 /* now we have informations to create the input */
315 p_pack->p_sout_input = sout_InputNew( p_pack->p_fifo,
316 &p_pack->output_format );
318 if( !p_pack->p_sout_input )
320 msg_Err( p_pack->p_fifo, "cannot add a new stream" );
324 p_sout_buffer = sout_BufferNew( p_pack->p_sout_input->p_sout,
326 p_sout_buffer->i_size = i_pos;
327 memcpy( p_sout_buffer->p_buffer, p_temp, i_pos );
333 sout_BufferNew( p_pack->p_sout_input->p_sout, 100 * 1024 );
337 p_pack->i_last_sequence_header++;
342 if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
347 i_code = ShowBits( &p_pack->bit_stream, 32 );
349 if( i_code == 0x1B8 ) /* GOP */
351 /* usefull for bad MPEG-1 : repeat the sequence_header
353 if( p_pack->i_last_sequence_header > (int) p_pack->d_frame_rate )
355 memcpy( p_sout_buffer->p_buffer + i_pos,
356 p_pack->p_sequence_header,
357 p_pack->i_sequence_header_length );
358 i_pos += p_pack->i_sequence_header_length;
359 p_pack->i_last_sequence_header = 0;
362 p_pack->i_last_ref_pts =
363 p_pack->i_last_dts + 40000; /* FIXME */
364 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
366 else if( i_code == 0x100 ) /* Picture */
368 /* picture_start_code */
369 GetChunk( &p_pack->bit_stream,
370 p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
371 i_temporal_ref = ShowBits( &p_pack->bit_stream, 10 );
373 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
376 else if( i_code == 0x1b5 )
378 /* extention start code 32 */
379 GetChunk( &p_pack->bit_stream,
380 p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
382 if( ShowBits( &p_pack->bit_stream, 4 ) == 0x08 )
384 /* picture coding extention */
386 /* extention start code identifier(b1000) 4 */
387 /* f_code[2][2] 16 */
388 /* intra_dc_precision 2 */
389 /* picture_structure 2 */
390 /* top_field_first 1 */
391 i_picture_structure =
392 ShowBits( &p_pack->bit_stream, 24 ) & 0x03;
394 ShowBits( &p_pack->bit_stream, 25 ) & 0x01;
395 i_repeat_first_field =
396 ShowBits( &p_pack->bit_stream, 31 ) & 0x01;
398 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
402 if( i_code == 0x1B3 )
404 p_pack->i_last_sequence_header = 0;
406 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
410 sout_BufferRealloc( p_pack->p_sout_input->p_sout,
411 p_sout_buffer, i_pos );
412 p_sout_buffer->i_size = i_pos;
414 /* calculate dts/pts */
415 if( p_pack->i_progressive_sequence || i_picture_structure == 0x03)
417 i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate );
421 i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate / 2);
424 p_sout_buffer->i_dts = p_pack->i_last_dts;
425 p_sout_buffer->i_pts = p_pack->i_last_ref_pts +
426 i_temporal_ref * (mtime_t)( 1000000 / p_pack->d_frame_rate );
427 p_sout_buffer->i_length = i_duration;
428 p_sout_buffer->i_bitrate = (int)( 8 * i_pos * p_pack->d_frame_rate );
429 sout_InputSendBuffer( p_pack->p_sout_input, p_sout_buffer );
431 if( p_pack->i_progressive_sequence )
433 if( i_top_field_first == 0 && i_repeat_first_field == 0 )
435 p_pack->i_last_dts += i_duration;
437 else if( i_top_field_first == 0 && i_repeat_first_field == 1 )
439 p_pack->i_last_dts += 2 * i_duration;
441 else if( i_top_field_first == 1 && i_repeat_first_field == 1 )
443 p_pack->i_last_dts += 3 * i_duration;
448 if( i_picture_structure == 0x03 )
450 p_pack->i_last_dts += i_duration;
452 else if( i_picture_structure == p_pack->i_last_picture_structure )
454 p_pack->i_last_dts += 2 * i_duration;
456 else if( ( !i_top_field_first && i_picture_structure == 0x01 ) ||
457 ( i_top_field_first && i_picture_structure == 0x02 ) )
459 p_pack->i_last_dts += 2 * i_duration;
462 p_pack->i_last_picture_structure = i_picture_structure;
466 /*****************************************************************************
467 * EndThread : packetizer thread destruction
468 *****************************************************************************/
469 static void EndThread ( packetizer_t *p_pack)
471 if( p_pack->p_sout_input )
473 sout_InputDelete( p_pack->p_sout_input );