/***************************************************************************** * voc.c : Creative Voice File (.VOC) demux module for vlc ***************************************************************************** * Copyright (C) 2005 Rémi Denis-Courmont * * Authors: Rémi Denis-Courmont * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include /***************************************************************************** * Module descriptor *****************************************************************************/ static int Open ( vlc_object_t * ); vlc_module_begin () set_description( N_("VOC demuxer") ) set_category( CAT_INPUT ) set_subcategory( SUBCAT_INPUT_DEMUX ) set_capability( "demux", 10 ) set_callback( Open ) vlc_module_end () /***************************************************************************** * Local prototypes *****************************************************************************/ static int Demux ( demux_t * ); static int Control( demux_t *, int i_query, va_list args ); typedef struct { es_format_t fmt; es_out_id_t *p_es; int64_t i_block_start; int64_t i_block_end; int64_t i_loop_offset; unsigned i_loop_count; unsigned i_silence_countdown; date_t pts; } demux_sys_t; static const char ct_header[] = "Creative Voice File\x1a"; /***************************************************************************** * Open: check file and initializes structures *****************************************************************************/ static int Open( vlc_object_t * p_this ) { demux_t *p_demux = (demux_t*)p_this; const uint8_t *p_buf; uint16_t i_data_offset, i_version; if( vlc_stream_Peek( p_demux->s, &p_buf, 26 ) < 26 ) return VLC_EGENERIC; if( memcmp( p_buf, ct_header, 20 ) ) return VLC_EGENERIC; p_buf += 20; i_data_offset = GetWLE( p_buf ); if ( i_data_offset < 26 /* not enough room for full VOC header */ ) return VLC_EGENERIC; p_buf += 2; i_version = GetWLE( p_buf ); if( ( i_version != 0x10A ) && ( i_version != 0x114 ) ) return VLC_EGENERIC; /* unknown VOC version */ p_buf += 2; if( GetWLE( p_buf ) != (uint16_t)(0x1234 + ~i_version) ) return VLC_EGENERIC; /* We have a valid VOC header */ msg_Dbg( p_demux, "CT Voice file v%d.%d", i_version >> 8, i_version & 0xff ); /* skip VOC header */ if( vlc_stream_Read( p_demux->s, NULL, i_data_offset ) < i_data_offset ) return VLC_EGENERIC; demux_sys_t *p_sys = vlc_obj_malloc( p_this, sizeof (*p_sys) ); if( unlikely(p_sys == NULL) ) return VLC_ENOMEM; p_sys->i_silence_countdown = p_sys->i_block_start = p_sys->i_block_end = p_sys->i_loop_count = 0; p_sys->p_es = NULL; date_Init( &p_sys->pts, 1, 1 ); date_Set( &p_sys->pts, VLC_TICK_0 ); es_format_Init( &p_sys->fmt, AUDIO_ES, 0 ); p_demux->pf_demux = Demux; p_demux->pf_control = Control; p_demux->p_sys = p_sys; return VLC_SUCCESS; } static int fmtcmp( es_format_t *ofmt, es_format_t *nfmt ) { return (ofmt->audio.i_bitspersample != nfmt->audio.i_bitspersample) || (ofmt->audio.i_rate != nfmt->audio.i_rate) || (ofmt->audio.i_channels != nfmt->audio.i_channels); } /* * Converts old-style VOC sample rates to commonly used ones * so as not to confuse sound card drivers. * (I assume 16k, 24k and 32k are never found in .VOC files) */ static unsigned int fix_voc_sr( unsigned int sr ) { switch( sr ) { /*case 8000: return 8000;*/ case 11111: return 11025; case 22222: return 22050; case 44444: return 44100; } return sr; } static int ReadBlockHeader( demux_t *p_demux ) { es_format_t new_fmt; uint8_t buf[8]; int32_t i_block_size; demux_sys_t *p_sys = p_demux->p_sys; if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 ) return VLC_EGENERIC; /* EOF */ i_block_size = GetDWLE( buf ) >> 8; msg_Dbg( p_demux, "new block: type: %u, size: %u", (unsigned)*buf, i_block_size ); es_format_Init( &new_fmt, AUDIO_ES, 0 ); switch( *buf ) { case 0: /* not possible : caught with earlier vlc_stream_Read */ goto corrupt; case 1: if( i_block_size < 2 ) goto corrupt; i_block_size -= 2; if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 ) goto corrupt; switch( buf[1] ) /* codec id */ { case 0x0: new_fmt.i_codec = VLC_CODEC_U8; new_fmt.audio.i_bytes_per_frame = 1; new_fmt.audio.i_bitspersample = 8; break; case 0x1: new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_4; new_fmt.audio.i_bytes_per_frame = 1; new_fmt.audio.i_bitspersample = 4; break; case 0x2: new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_3; new_fmt.audio.i_bytes_per_frame = 3; new_fmt.audio.i_bitspersample = 3; break; case 0x3: new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_2; new_fmt.audio.i_bytes_per_frame = 1; new_fmt.audio.i_bitspersample = 2; break; case 0x4: new_fmt.i_codec = VLC_CODEC_S16L; new_fmt.audio.i_bytes_per_frame = 2; new_fmt.audio.i_bitspersample = 16; break; case 0x6: new_fmt.i_codec = VLC_CODEC_ALAW; new_fmt.audio.i_bytes_per_frame = 1; new_fmt.audio.i_bitspersample = 8; break; case 0x7: new_fmt.i_codec = VLC_CODEC_MULAW; new_fmt.audio.i_bytes_per_frame = 1; new_fmt.audio.i_bitspersample = 8; break; default: msg_Err( p_demux, "unsupported compression 0x%"PRIx8, buf[1] ); return VLC_EGENERIC; } new_fmt.audio.i_channels = 1; new_fmt.audio.i_bytes_per_frame *= new_fmt.audio.i_channels; new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame; new_fmt.audio.i_frame_length = new_fmt.audio.i_bytes_per_frame * 8 / new_fmt.audio.i_bitspersample; new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) ); new_fmt.i_bitrate = new_fmt.audio.i_rate * new_fmt.audio.i_bitspersample * new_fmt.audio.i_channels; break; case 2: /* data block with same format as the previous one */ if( p_sys->p_es == NULL ) goto corrupt; /* no previous block! */ memcpy( &new_fmt, &p_sys->fmt, sizeof( new_fmt ) ); break; case 3: /* silence block */ if( ( i_block_size != 3 ) || ( vlc_stream_Read( p_demux->s, buf, 3 ) < 3 ) ) goto corrupt; i_block_size = 0; p_sys->i_silence_countdown = GetWLE( buf ); new_fmt.i_codec = VLC_CODEC_U8; new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) ); new_fmt.audio.i_bytes_per_frame = 1; new_fmt.audio.i_frame_length = 1; new_fmt.audio.i_channels = 1; new_fmt.audio.i_blockalign = 1; new_fmt.audio.i_bitspersample = 8; new_fmt.i_bitrate = new_fmt.audio.i_rate * 8; break; case 6: /* repeat block */ if( ( i_block_size != 2 ) || ( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 ) ) goto corrupt; i_block_size = 0; p_sys->i_loop_count = GetWLE( buf ); p_sys->i_loop_offset = vlc_stream_Tell( p_demux->s ); break; case 7: /* repeat end block */ if( i_block_size != 0 ) goto corrupt; if( p_sys->i_loop_count > 0 ) { if( vlc_stream_Seek( p_demux->s, p_sys->i_loop_offset ) ) msg_Warn( p_demux, "cannot loop: seek failed" ); else p_sys->i_loop_count--; } break; case 8: /* * Block 8 is a big kludge to add stereo support to block 1 : * A block of type 8 is always followed by a block of type 1 * and specifies the number of channels in that 1-block * (normally block 1 are always mono). In practice, block type 9 * is used for stereo rather than 8 */ if( ( i_block_size != 4 ) || ( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 ) ) goto corrupt; if( buf[2] ) { msg_Err( p_demux, "unsupported compression" ); return VLC_EGENERIC; } new_fmt.i_codec = VLC_CODEC_U8; if (buf[3] >= 32) goto corrupt; new_fmt.audio.i_channels = buf[3] + 1; /* can't be nul */ new_fmt.audio.i_rate = 256000000L / ((65536L - GetWLE(buf)) * new_fmt.audio.i_channels); new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels; new_fmt.audio.i_frame_length = 1; new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame; new_fmt.audio.i_bitspersample = 8 * new_fmt.audio.i_bytes_per_frame; new_fmt.i_bitrate = new_fmt.audio.i_rate * 8; /* read subsequent block 1 */ if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 ) return VLC_EGENERIC; /* EOF */ i_block_size = GetDWLE( buf ) >> 8; msg_Dbg( p_demux, "new block: type: %u, size: %u", (unsigned)*buf, i_block_size ); if( i_block_size < 2 ) goto corrupt; i_block_size -= 2; if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 ) goto corrupt; if( buf[1] ) { msg_Err( p_demux, "unsupported compression" ); return VLC_EGENERIC; } break; case 9: /* newer data block with channel number and bits resolution */ if( i_block_size < 12 ) goto corrupt; i_block_size -= 12; if( ( vlc_stream_Read( p_demux->s, buf, 8 ) < 8 ) || ( vlc_stream_Read( p_demux->s, NULL, 4 ) < 4 ) ) goto corrupt; new_fmt.audio.i_rate = GetDWLE( buf ); if( !new_fmt.audio.i_rate ) goto corrupt; new_fmt.audio.i_bitspersample = buf[4]; new_fmt.audio.i_channels = buf[5]; switch( GetWLE( &buf[6] ) ) /* format */ { case 0x0000: /* PCM */ switch( new_fmt.audio.i_bitspersample ) { case 8: new_fmt.i_codec = VLC_CODEC_U8; break; case 16: new_fmt.i_codec = VLC_CODEC_U16L; break; default: msg_Err( p_demux, "unsupported bit res.: %u bits", new_fmt.audio.i_bitspersample ); return VLC_EGENERIC; } break; case 0x0004: /* signed */ switch( new_fmt.audio.i_bitspersample ) { case 8: new_fmt.i_codec = VLC_CODEC_S8; break; case 16: new_fmt.i_codec = VLC_CODEC_S16L; break; default: msg_Err( p_demux, "unsupported bit res.: %u bits", new_fmt.audio.i_bitspersample ); return VLC_EGENERIC; } break; default: msg_Err( p_demux, "unsupported compression" ); return VLC_EGENERIC; } if( new_fmt.audio.i_channels == 0 ) { msg_Err( p_demux, "0 channels detected" ); return VLC_EGENERIC; } new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels * (new_fmt.audio.i_bitspersample / 8); new_fmt.audio.i_frame_length = 1; new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame; new_fmt.i_bitrate = 8 * new_fmt.audio.i_rate * new_fmt.audio.i_bytes_per_frame; break; default: msg_Dbg( p_demux, "unknown block type %u - skipping block", (unsigned)*buf); /* fall through */ case 4: /* blocks of non-audio types can be skipped */ case 5: if( vlc_stream_Read( p_demux->s, NULL, i_block_size ) < i_block_size ) goto corrupt; i_block_size = 0; break; } p_sys->i_block_start = vlc_stream_Tell( p_demux->s ); p_sys->i_block_end = p_sys->i_block_start + i_block_size; if( i_block_size || p_sys->i_silence_countdown ) { /* we've read a block with data in it - update decoder */ msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, " "freq: %d Hz, bitrate: %dKo/s, blockalign: %d, " "bits/samples: %d", (char *)&new_fmt.i_codec, new_fmt.audio.i_channels, new_fmt.audio.i_rate, new_fmt.i_bitrate / 8192, new_fmt.audio.i_blockalign, new_fmt.audio.i_bitspersample ); if( ( p_sys->p_es != NULL ) && fmtcmp( &p_sys->fmt, &new_fmt ) ) { msg_Dbg( p_demux, "codec change needed" ); es_out_Del( p_demux->out, p_sys->p_es ); p_sys->p_es = NULL; } if( p_sys->p_es == NULL ) { memcpy( &p_sys->fmt, &new_fmt, sizeof( p_sys->fmt ) ); date_Change( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 ); p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt ); if( unlikely(p_sys->p_es == NULL) ) return VLC_ENOMEM; } } return VLC_SUCCESS; corrupt: msg_Err( p_demux, "corrupted file - halting demux" ); return VLC_EGENERIC; } /***************************************************************************** * Demux: read packet and send them to decoders ***************************************************************************** * Returns -1 in case of error, 0 in case of EOF, 1 otherwise *****************************************************************************/ #define MAX_READ_FRAME 1000 static int Demux( demux_t *p_demux ) { demux_sys_t *p_sys = p_demux->p_sys; block_t *p_block; int64_t i_read_frames; if( p_sys->i_silence_countdown == 0 ) { int64_t i_offset = vlc_stream_Tell( p_demux->s ); if( i_offset >= p_sys->i_block_end ) { if( ReadBlockHeader( p_demux ) != VLC_SUCCESS ) return VLC_DEMUXER_EOF; return VLC_DEMUXER_SUCCESS; } i_read_frames = ( p_sys->i_block_end - i_offset ) / p_sys->fmt.audio.i_bytes_per_frame; if( i_read_frames > MAX_READ_FRAME ) i_read_frames = MAX_READ_FRAME; p_block = vlc_stream_Block( p_demux->s, p_sys->fmt.audio.i_bytes_per_frame * i_read_frames ); if( p_block == NULL ) { msg_Warn( p_demux, "cannot read data" ); return VLC_DEMUXER_EOF; } } else { /* emulates silence from the stream */ i_read_frames = p_sys->i_silence_countdown; if( i_read_frames > MAX_READ_FRAME ) i_read_frames = MAX_READ_FRAME; p_block = block_Alloc( i_read_frames ); if( p_block == NULL ) return VLC_ENOMEM; memset( p_block->p_buffer, 0, i_read_frames ); p_sys->i_silence_countdown -= i_read_frames; } p_block->i_dts = p_block->i_pts = VLC_TICK_0 + date_Get( &p_sys->pts ); p_block->i_nb_samples = i_read_frames * p_sys->fmt.audio.i_frame_length; date_Increment( &p_sys->pts, p_block->i_nb_samples ); es_out_SetPCR( p_demux->out, p_block->i_pts ); assert(p_sys->p_es != NULL); es_out_Send( p_demux->out, p_sys->p_es, p_block ); return VLC_DEMUXER_SUCCESS; } /***************************************************************************** * Control: *****************************************************************************/ static int Control( demux_t *p_demux, int i_query, va_list args ) { demux_sys_t *p_sys = p_demux->p_sys; return demux_vaControlHelper( p_demux->s, p_sys->i_block_start, p_sys->i_block_end, p_sys->fmt.i_bitrate, p_sys->fmt.audio.i_blockalign, i_query, args ); }