1 /*****************************************************************************
2 * voc.c : Creative Voice File (.VOC) demux module for vlc
3 *****************************************************************************
4 * Copyright (C) 2005 VideoLAN
7 * Authors: Remi Denis-Courmont <rem # videolan.org>
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 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc/input.h>
35 /*****************************************************************************
37 *****************************************************************************/
38 static int Open ( vlc_object_t * );
39 static void Close( vlc_object_t * );
42 set_description( _("VOC demuxer") );
43 set_category( CAT_INPUT );
44 set_subcategory( SUBCAT_INPUT_DEMUX );
45 set_capability( "demux2", 10 );
46 set_callbacks( Open, Close );
49 /*****************************************************************************
51 *****************************************************************************/
52 static int Demux ( demux_t * );
53 static int Control( demux_t *, int i_query, va_list args );
60 int64_t i_block_start;
63 int64_t i_loop_offset;
64 unsigned i_loop_count;
65 unsigned i_silence_countdown;
70 static const char ct_header[] = "Creative Voice File\x1a";
72 /*****************************************************************************
73 * Open: check file and initializes structures
74 *****************************************************************************/
75 static int Open( vlc_object_t * p_this )
77 demux_t *p_demux = (demux_t*)p_this;
80 uint16_t i_data_offset, i_version;
82 if( stream_Peek( p_demux->s, &p_buf, 26 ) < 26 )
85 if( memcmp( p_buf, ct_header, 20 ) )
89 i_data_offset = GetWLE( p_buf );
90 if ( i_data_offset < 26 /* not enough room for full VOC header */ )
94 i_version = GetWLE( p_buf );
95 if( ( i_version != 0x10A ) && ( i_version != 0x114 ) )
96 return VLC_EGENERIC; /* unknown VOC version */
99 if( GetWLE( p_buf ) != (uint16_t)(0x1234 + ~i_version) )
102 /* We have a valid VOC header */
103 msg_Dbg( p_demux, "CT Voice file v%d.%d", i_version >> 8,
106 /* skip VOC header */
107 if( stream_Read( p_demux->s, NULL, i_data_offset ) < i_data_offset )
110 p_demux->pf_demux = Demux;
111 p_demux->pf_control = Control;
112 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
116 p_sys->i_silence_countdown = p_sys->i_block_start = p_sys->i_block_end =
117 p_sys->i_loop_count = 0;
120 date_Init( &p_sys->pts, 1, 1 );
121 date_Set( &p_sys->pts, 1 );
123 es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
129 static int fmtcmp( es_format_t *ofmt, es_format_t *nfmt )
131 return (ofmt->audio.i_bitspersample != nfmt->audio.i_bitspersample)
132 || (ofmt->audio.i_rate != nfmt->audio.i_rate)
133 || (ofmt->audio.i_channels != nfmt->audio.i_channels);
138 * Converts old-style VOC sample rates to commonly used ones
139 * so as not to confuse sound card drivers.
140 * (I assume 16k, 24k and 32k are never found in .VOC files)
142 static unsigned int fix_voc_sr( unsigned int sr )
161 static int ReadBlockHeader( demux_t *p_demux )
165 int32_t i_block_size;
166 demux_sys_t *p_sys = p_demux->p_sys;
168 if( stream_Read( p_demux->s, buf, 4 ) < 4 )
169 return VLC_EGENERIC; /* EOF */
171 i_block_size = GetDWLE( buf ) >> 8;
172 msg_Dbg( p_demux, "new block: type: %u, size: %u",
173 (unsigned)*buf, i_block_size );
175 es_format_Init( &new_fmt, AUDIO_ES, 0 );
179 case 0: /* not possible : caught with earlier stream_Read */
183 if( i_block_size < 2 )
187 if( stream_Read( p_demux->s, buf, 2 ) < 2 )
192 msg_Err( p_demux, "Unsupported compression" );
196 new_fmt.i_codec = VLC_FOURCC('u','8',' ',' ');
197 new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
198 new_fmt.audio.i_bytes_per_frame = 1;
199 new_fmt.audio.i_frame_length = 1;
200 new_fmt.audio.i_channels = 1;
201 new_fmt.audio.i_blockalign = 1;
202 new_fmt.audio.i_bitspersample = 8;
203 new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
206 case 2: /* data block with same format as the previous one */
207 if( p_sys->p_es == NULL )
208 goto corrupt; /* no previous block! */
210 memcpy( &new_fmt, &p_sys->fmt, sizeof( new_fmt ) );
213 case 3: /* silence block */
214 if( ( i_block_size != 3 )
215 || ( stream_Read( p_demux->s, buf, 3 ) < 3 ) )
219 p_sys->i_silence_countdown = GetWLE( buf );
221 new_fmt.i_codec = VLC_FOURCC('u','8',' ',' ');
222 new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
223 new_fmt.audio.i_bytes_per_frame = 1;
224 new_fmt.audio.i_frame_length = 1;
225 new_fmt.audio.i_channels = 1;
226 new_fmt.audio.i_blockalign = 1;
227 new_fmt.audio.i_bitspersample = 8;
228 new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
231 case 6: /* repeat block */
232 if( ( i_block_size != 2 )
233 || ( stream_Read( p_demux->s, buf, 2 ) < 2 ) )
237 p_sys->i_loop_count = GetWLE( buf );
238 p_sys->i_loop_offset = stream_Tell( p_demux->s );
241 case 7: /* repeat end block */
242 if( i_block_size != 0 )
245 if( p_sys->i_loop_count > 0 )
247 if( stream_Seek( p_demux->s, p_sys->i_loop_offset ) )
248 msg_Warn( p_demux, "cannot loop: seek failed" );
250 p_sys->i_loop_count--;
254 /* FIXME: support block type 8 properly */
256 msg_Err( p_demux, "Unimplemented block type 8" );
260 if( i_block_size < 12 )
264 if( ( stream_Read( p_demux->s, buf, 8 ) < 8 )
265 || ( stream_Read( p_demux->s, NULL, 4 ) < 4 ) )
268 new_fmt.audio.i_rate = GetDWLE( buf );
269 new_fmt.audio.i_bitspersample = buf[4];
270 new_fmt.audio.i_channels = buf[5];
272 switch( GetWLE( &buf[6] ) ) /* format */
274 case 0x0000: /* PCM */
275 switch( new_fmt.audio.i_bitspersample )
278 new_fmt.i_codec = VLC_FOURCC('u','8',' ',' ');
282 new_fmt.i_codec = VLC_FOURCC('u','1','6','l');
286 msg_Err( p_demux, "Unsupported bit res.: %u bits",
287 new_fmt.audio.i_bitspersample );
292 case 0x0004: /* signed */
293 switch( new_fmt.audio.i_bitspersample )
296 new_fmt.i_codec = VLC_FOURCC('s','8',' ',' ');
300 new_fmt.i_codec = VLC_FOURCC('s','1','6','l');
304 msg_Err( p_demux, "Unsupported bit res.: %u bits",
305 new_fmt.audio.i_bitspersample );
311 msg_Err( p_demux, "Unsupported compression" );
315 new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels
316 * (new_fmt.audio.i_bitspersample / 8);
317 new_fmt.audio.i_frame_length = 1;
318 new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
319 new_fmt.i_bitrate = 8 * new_fmt.audio.i_rate
320 * new_fmt.audio.i_bytes_per_frame;
324 msg_Dbg( p_demux, "Unknown block type %u - skipping block",
326 case 4: /* blocks of non-audio types can be skipped */
328 if( stream_Read( p_demux->s, NULL, i_block_size ) < i_block_size )
334 p_sys->i_block_start = stream_Tell( p_demux->s );
335 p_sys->i_block_end = p_sys->i_block_start + i_block_size;
337 if( i_block_size || p_sys->i_silence_countdown )
339 /* we've read a block with data in it - update decoder */
340 msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
341 "freq: %d Hz, bitrate: %dKo/s, blockalign: %d, "
342 "bits/samples: %d", (char *)&new_fmt.i_codec,
343 new_fmt.audio.i_channels, new_fmt.audio.i_rate,
344 new_fmt.i_bitrate / 8192, new_fmt.audio.i_blockalign,
345 new_fmt.audio.i_bitspersample );
347 if( ( p_sys->p_es != NULL ) && fmtcmp( &p_sys->fmt, &new_fmt ) )
349 msg_Dbg( p_demux, "codec change needed" );
350 es_out_Del( p_demux->out, p_sys->p_es );
354 if( p_sys->p_es == NULL )
356 memcpy( &p_sys->fmt, &new_fmt, sizeof( p_sys->fmt ) );
357 date_Change( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
358 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
365 msg_Err( p_demux, "corrupted file - halting demux" );
369 /*****************************************************************************
370 * Demux: read packet and send them to decoders
371 *****************************************************************************
372 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
373 *****************************************************************************/
374 static int Demux( demux_t *p_demux )
376 demux_sys_t *p_sys = p_demux->p_sys;
380 i_offset = stream_Tell( p_demux->s );
382 while( ( i_offset >= p_sys->i_block_end )
383 && ( p_sys->i_silence_countdown == 0 ) )
384 if( ReadBlockHeader( p_demux ) != VLC_SUCCESS )
387 if( p_sys->i_silence_countdown == 0 )
389 i = ( p_sys->i_block_end - i_offset )
390 / p_sys->fmt.audio.i_bytes_per_frame;
394 p_block = stream_Block( p_demux->s,
395 p_sys->fmt.audio.i_bytes_per_frame * i );
396 if( p_block == NULL )
398 msg_Warn( p_demux, "cannot read data" );
403 { /* emulates silence from the stream */
404 i = p_sys->i_silence_countdown;
408 p_block = block_New( p_demux, i );
409 if( p_block == NULL )
412 memset( p_block->p_buffer, 0, i );
413 p_sys->i_silence_countdown -= i;
416 p_block->i_dts = p_block->i_pts =
417 date_Increment( &p_sys->pts, p_sys->fmt.audio.i_frame_length * i );
419 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
421 es_out_Send( p_demux->out, p_sys->p_es, p_block );
426 /*****************************************************************************
427 * Close: frees unused data
428 *****************************************************************************/
429 static void Close ( vlc_object_t * p_this )
431 demux_sys_t *p_sys = ((demux_t *)p_this)->p_sys;
436 /*****************************************************************************
438 *****************************************************************************/
439 static int Control( demux_t *p_demux, int i_query, va_list args )
441 demux_sys_t *p_sys = p_demux->p_sys;
443 return demux2_vaControlHelper( p_demux->s, p_sys->i_block_start,
445 p_sys->fmt.i_bitrate,
446 p_sys->fmt.audio.i_blockalign,