1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: mpegvideo.c,v 1.2 2003/01/08 10:26:49 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') &&
87 p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '1') &&
88 p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '2') )
97 /*****************************************************************************
98 * RunDecoder: this function is called just after the thread is created
99 *****************************************************************************/
100 static int Run( decoder_fifo_t *p_fifo )
102 packetizer_t *p_pack;
105 msg_Info( p_fifo, "Running mpegvideo packetizer" );
106 if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) )
108 msg_Err( p_fifo, "out of memory" );
109 DecoderError( p_fifo );
112 memset( p_pack, 0, sizeof( packetizer_t ) );
114 p_pack->p_fifo = p_fifo;
116 if( InitThread( p_pack ) != 0 )
118 DecoderError( p_fifo );
122 while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
124 PacketizeThread( p_pack );
128 if( ( b_error = p_pack->p_fifo->b_error ) )
130 DecoderError( p_pack->p_fifo );
149 /*****************************************************************************
150 * InitThread: initialize data before entering main loop
151 *****************************************************************************/
153 static int InitThread( packetizer_t *p_pack )
156 p_pack->output_format.i_cat = VIDEO_ES;
157 p_pack->output_format.i_fourcc = VLC_FOURCC( 'm', 'p', 'g', 'v');
159 p_pack->p_sout_input = NULL;
161 if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
162 NULL, NULL ) != VLC_SUCCESS )
164 msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
171 /* from ISO 13818-2 */
172 /* converting frame_rate_code to frame_rate */
173 static const double pd_frame_rates[16] =
175 0, 24000/1001, 24, 25, 30000/1001, 30, 50, 60000/1001, 60,
179 static int CopyUntilNextStartCode( packetizer_t *p_pack,
180 sout_buffer_t *p_sout_buffer,
187 p_sout_buffer->p_buffer[(*pi_pos)++] =
188 GetBits( &p_pack->bit_stream, 8 );
191 if( *pi_pos + 2048 > p_sout_buffer->i_allocated_size )
193 sout_BufferRealloc( p_pack->p_sout_input->p_sout,
195 p_sout_buffer->i_allocated_size + 50 * 1024);
198 } while( ShowBits( &p_pack->bit_stream, 24 ) != 0x01 &&
199 !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error );
204 /*****************************************************************************
205 * PacketizeThread: packetize an unit (here copy a complete pes)
206 *****************************************************************************/
207 static void PacketizeThread( packetizer_t *p_pack )
209 sout_buffer_t *p_sout_buffer = NULL;
211 int i_temporal_ref = 0;
214 if( !p_pack->p_sout_input )
216 byte_t p_temp[512];/* 150 bytes is the maximal size
217 of a sequence_header + sequence_extension */
218 int i_frame_rate_code;
219 BITMAPINFOHEADER *p_bih;
221 p_bih = malloc( sizeof( BITMAPINFOHEADER ) );
222 p_pack->output_format.p_format = (void*)p_bih;
224 /* skip data until we find a sequence_header_code */
225 /* TODO: store skipped somewhere so can send it to the mux
226 * after the input is created */
228 while( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B3 )
230 RemoveBits( &p_pack->bit_stream, 8 );
233 msg_Warn( p_pack->p_fifo, "sequence_header_code found (%d skipped)",
236 /* copy the start_code */
238 GetChunk( &p_pack->bit_stream, p_temp, 4 ); i_pos += 4;
240 p_bih->biSize = sizeof( BITMAPINFOHEADER );
241 /* horizontal_size_value */
242 p_bih->biWidth = ShowBits( &p_pack->bit_stream, 12 );
243 /* vertical_size_value */
244 p_bih->biHeight = ShowBits( &p_pack->bit_stream, 24 ) & 0xFFF;
245 /* frame_rate_code */
246 i_frame_rate_code = ShowBits( &p_pack->bit_stream, 32 ) & 0xF;
248 p_bih->biBitCount = 0;
249 p_bih->biCompression = 0x6D706732; /* mpg2 */
250 p_bih->biSizeImage = 0;
251 p_bih->biXPelsPerMeter = 0;
252 p_bih->biYPelsPerMeter = 0;
253 p_bih->biClrUsed = 0;
254 p_bih->biClrImportant = 0;
257 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 7 ); i_pos += 7;
259 /* intra_quantiser_matrix [non_intra_quantiser_matrix] */
260 if( ShowBits( &p_pack->bit_stream, 7 ) & 0x1 )
263 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 64 ); i_pos += 64;
265 if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
267 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
270 /* non_intra_quantiser_matrix */
271 else if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
273 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
278 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 1 ); i_pos += 1;
281 /* sequence_extension (10 bytes) */
282 if( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B5 )
283 msg_Dbg( p_pack->p_fifo, "ARRGG no extension_start_code" );
285 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 10 ); i_pos += 10;
287 /* remember sequence_header and sequence_extention */
288 memcpy( p_pack->p_sequence_header, p_temp, i_pos );
289 p_pack->i_sequence_header_length = i_pos;
291 p_pack->d_frame_rate = pd_frame_rates[i_frame_rate_code];
293 msg_Warn( p_pack->p_fifo,
294 "creating input (image size %dx%d, frame rate %.2f)",
295 p_bih->biWidth, p_bih->biHeight, p_pack->d_frame_rate );
297 /* now we have informations to create the input */
298 p_pack->p_sout_input = sout_InputNew( p_pack->p_fifo,
299 &p_pack->output_format );
301 if( !p_pack->p_sout_input )
303 msg_Err( p_pack->p_fifo, "cannot add a new stream" );
307 p_sout_buffer = sout_BufferNew( p_pack->p_sout_input->p_sout,
309 p_sout_buffer->i_size = i_pos;
310 memcpy( p_sout_buffer->p_buffer, p_temp, i_pos );
316 sout_BufferNew( p_pack->p_sout_input->p_sout, 100 * 1024 );
320 p_pack->i_last_sequence_header++;
325 if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
330 i_code = ShowBits( &p_pack->bit_stream, 32 );
332 if( i_code == 0x1B8 ) /* GOP */
334 /* usefull for bad MPEG-1 : repeat the sequence_header
336 if( p_pack->i_last_sequence_header > (int) p_pack->d_frame_rate )
338 memcpy( p_sout_buffer->p_buffer + i_pos,
339 p_pack->p_sequence_header,
340 p_pack->i_sequence_header_length );
341 i_pos += p_pack->i_sequence_header_length;
342 p_pack->i_last_sequence_header = 0;
345 p_pack->i_last_ref_pts =
346 p_pack->i_last_dts + 40000; /* FIXME */
347 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
349 else if( i_code == 0x100 ) /* Picture */
351 /* picture_start_code */
352 GetChunk( &p_pack->bit_stream,
353 p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
354 i_temporal_ref = ShowBits( &p_pack->bit_stream, 10 );
356 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
361 if( i_code == 0x1B3 )
363 p_pack->i_last_sequence_header = 0;
365 CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
369 sout_BufferRealloc( p_pack->p_sout_input->p_sout,
370 p_sout_buffer, i_pos );
371 p_sout_buffer->i_size = i_pos;
373 p_sout_buffer->i_dts = p_pack->i_last_dts;
374 p_sout_buffer->i_pts = p_pack->i_last_ref_pts +
375 i_temporal_ref * (mtime_t)( 1000000 / p_pack->d_frame_rate );
377 p_sout_buffer->i_length = (uint64_t)1000000 / p_pack->d_frame_rate;
378 p_sout_buffer->i_bitrate = (int)( 8 * i_pos * p_pack->d_frame_rate );
380 // msg_Dbg( p_pack->p_fifo, "frame length %d b", i_pos );
382 sout_InputSendBuffer( p_pack->p_sout_input, p_sout_buffer );
384 p_pack->i_last_dts += (mtime_t)( 1000000 / p_pack->d_frame_rate );
388 /*****************************************************************************
389 * EndThread : packetizer thread destruction
390 *****************************************************************************/
391 static void EndThread ( packetizer_t *p_pack)
393 if( p_pack->p_sout_input )
395 sout_InputDelete( p_pack->p_sout_input );