1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: mpegvideo.c,v 1.1 2002/12/14 21:32:41 fenrir 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 uint8_t p_sequence_header[150];
54 int i_sequence_header_length;
55 int i_last_sequence_header;
59 static int Open ( vlc_object_t * );
60 static int Run ( decoder_fifo_t * );
62 static int InitThread ( packetizer_t * );
63 static void PacketizeThread ( packetizer_t * );
64 static void EndThread ( packetizer_t * );
66 /*****************************************************************************
68 *****************************************************************************/
71 set_description( _("MPEG-I/II video packetizer") );
72 set_capability( "packetizer", 50 );
73 set_callbacks( Open, NULL );
76 /*****************************************************************************
77 * OpenDecoder: probe the packetizer and return score
78 *****************************************************************************
79 * Tries to launch a decoder and return score so that the interface is able
81 *****************************************************************************/
82 static int Open( vlc_object_t *p_this )
84 decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
86 if( p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', 'v') )
95 /*****************************************************************************
96 * RunDecoder: this function is called just after the thread is created
97 *****************************************************************************/
98 static int Run( decoder_fifo_t *p_fifo )
100 packetizer_t *p_pack;
103 msg_Info( p_fifo, "Running mpegvideo packetizer" );
104 if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) )
106 msg_Err( p_fifo, "out of memory" );
107 DecoderError( p_fifo );
110 memset( p_pack, 0, sizeof( packetizer_t ) );
112 p_pack->p_fifo = p_fifo;
114 if( InitThread( p_pack ) != 0 )
116 DecoderError( p_fifo );
120 while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
122 PacketizeThread( p_pack );
126 if( ( b_error = p_pack->p_fifo->b_error ) )
128 DecoderError( p_pack->p_fifo );
147 /*****************************************************************************
148 * InitThread: initialize data before entering main loop
149 *****************************************************************************/
151 static int InitThread( packetizer_t *p_pack )
154 p_pack->output_format.i_cat = VIDEO_ES;
155 p_pack->output_format.i_fourcc = p_pack->p_fifo->i_fourcc;
157 p_pack->p_sout_input = NULL;
159 if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
160 NULL, NULL ) != VLC_SUCCESS )
162 msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
169 /* from ISO 13818-2 */
170 /* converting frame_rate_code to frame_rate */
171 static const double pd_frame_rates[16] =
173 0, 24000/1001, 24, 25, 30000/1001, 30, 50, 60000/1001, 60,
177 static int CopyUntilNextStartCode( packetizer_t *p_pack,
178 sout_buffer_t *p_sout_buffer,
185 p_sout_buffer->p_buffer[(*pi_pos)++] =
186 GetBits( &p_pack->bit_stream, 8 );
189 if( *pi_pos + 2048 > p_sout_buffer->i_allocated_size )
191 sout_BufferRealloc( p_pack->p_sout_input->p_sout,
193 p_sout_buffer->i_allocated_size + 50 * 1024);
196 } while( ShowBits( &p_pack->bit_stream, 24 ) != 0x01 &&
197 !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error );
202 /*****************************************************************************
203 * PacketizeThread: packetize an unit (here copy a complete pes)
204 *****************************************************************************/
205 static void PacketizeThread( packetizer_t *p_pack )
207 sout_buffer_t *p_sout_buffer = NULL;
209 int i_temporal_ref = 0;
212 if( !p_pack->p_sout_input )
214 byte_t p_temp[512];/* 150 bytes is the maximal size
215 of a sequence_header + sequence_extension */
216 int i_frame_rate_code;
217 BITMAPINFOHEADER *p_bih;
219 p_bih = malloc( sizeof( BITMAPINFOHEADER ) );
220 p_pack->output_format.p_format = (void*)p_bih;
222 /* skip data until we find a sequence_header_code */
223 /* TODO: store skipped somewhere so can send it to the mux
224 * after the input is created */
226 while( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B3 )
228 RemoveBits( &p_pack->bit_stream, 8 );
231 msg_Warn( p_pack->p_fifo, "sequence_header_code found (%d skipped)",
234 /* copy the start_code */
236 GetChunk( &p_pack->bit_stream, p_temp, 4 ); i_pos += 4;
238 p_bih->biSize = sizeof( BITMAPINFOHEADER );
239 /* horizontal_size_value */
240 p_bih->biWidth = ShowBits( &p_pack->bit_stream, 12 );
241 /* vertical_size_value */
242 p_bih->biHeight = ShowBits( &p_pack->bit_stream, 24 ) & 0xFFF;
243 /* frame_rate_code */
244 i_frame_rate_code = ShowBits( &p_pack->bit_stream, 32 ) & 0xF;
246 p_bih->biBitCount = 0;
247 p_bih->biCompression = 0x6D706732; /* mpg2 */
248 p_bih->biSizeImage = 0;
249 p_bih->biXPelsPerMeter = 0;
250 p_bih->biYPelsPerMeter = 0;
251 p_bih->biClrUsed = 0;
252 p_bih->biClrImportant = 0;
255 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 7 ); i_pos += 7;
257 /* intra_quantiser_matrix [non_intra_quantiser_matrix] */
258 if( ShowBits( &p_pack->bit_stream, 7 ) & 0x1 )
261 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 64 ); i_pos += 64;
263 if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
265 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
268 /* non_intra_quantiser_matrix */
269 else if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
271 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
276 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 1 ); i_pos += 1;
279 /* sequence_extension (10 bytes) */
280 if( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B5 )
281 msg_Dbg( p_pack->p_fifo, "ARRGG no extension_start_code" );
283 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 10 ); i_pos += 10;
285 /* remember sequence_header and sequence_extention */
286 memcpy( p_pack->p_sequence_header, p_temp, i_pos );
287 p_pack->i_sequence_header_length = i_pos;
289 p_pack->d_frame_rate = pd_frame_rates[i_frame_rate_code];
291 msg_Warn( p_pack->p_fifo,
292 "creating input (image size %dx%d, frame rate %.2f)",
293 p_bih->biWidth, p_bih->biHeight, p_pack->d_frame_rate );
295 /* now we have informations to create the input */
296 p_pack->p_sout_input = sout_InputNew( p_pack->p_fifo,
297 &p_pack->output_format );
299 if( !p_pack->p_sout_input )
301 msg_Err( p_pack->p_fifo, "cannot add a new stream" );
305 p_sout_buffer = sout_BufferNew( p_pack->p_sout_input->p_sout,
307 p_sout_buffer->i_size = i_pos;
308 memcpy( p_sout_buffer->p_buffer, p_temp, i_pos );
314 sout_BufferNew( p_pack->p_sout_input->p_sout, 100 * 1024 );
318 p_pack->i_last_sequence_header++;
323 if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
328 i_code = ShowBits( &p_pack->bit_stream, 32 );
330 if( i_code == 0x1B8 ) /* GOP */
332 /* usefull for bad MPEG-1 : repeat the sequence_header
334 if( p_pack->i_last_sequence_header > (int) p_pack->d_frame_rate )
336 memcpy( p_sout_buffer->p_buffer + i_pos,
337 p_pack->p_sequence_header,
338 p_pack->i_sequence_header_length );
339 i_pos += p_pack->i_sequence_header_length;
340 p_pack->i_last_sequence_header = 0;
343 p_pack->i_last_ref_pts =
344 p_pack->i_last_dts + 40000; /* FIXME */
345 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
347 else if( i_code == 0x100 ) /* Picture */
349 /* picture_start_code */
350 GetChunk( &p_pack->bit_stream,
351 p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
352 i_temporal_ref = ShowBits( &p_pack->bit_stream, 10 );
354 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
359 if( i_code == 0x1B3 )
361 p_pack->i_last_sequence_header = 0;
363 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
367 sout_BufferRealloc( p_pack->p_sout_input->p_sout,
368 p_sout_buffer, i_pos );
369 p_sout_buffer->i_size = i_pos;
371 p_sout_buffer->i_dts = p_pack->i_last_dts;
372 p_sout_buffer->i_pts = p_pack->i_last_ref_pts +
373 i_temporal_ref * (mtime_t)( 1000000 / p_pack->d_frame_rate );
375 p_sout_buffer->i_length = (uint64_t)1000000 / p_pack->d_frame_rate;
376 p_sout_buffer->i_bitrate = (int)( 8 * i_pos * p_pack->d_frame_rate );
378 // msg_Dbg( p_pack->p_fifo, "frame length %d b", i_pos );
380 sout_InputSendBuffer( p_pack->p_sout_input, p_sout_buffer );
382 p_pack->i_last_dts += (mtime_t)( 1000000 / p_pack->d_frame_rate );
386 /*****************************************************************************
387 * EndThread : packetizer thread destruction
388 *****************************************************************************/
389 static void EndThread ( packetizer_t *p_pack)
391 if( p_pack->p_sout_input )
393 sout_InputDelete( p_pack->p_sout_input );