/src/vlc/modules/demux/voc.c

Source
/*****************************************************************************
 * 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 <assert.h>

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_demux.h>

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );

vlc_module_begin ()
    set_description( N_("VOC demuxer") )
    set_subcategory( SUBCAT_INPUT_DEMUX )
    set_capability( "demux", 10 )
    set_callback( Open )
    add_file_extension("voc")
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_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;

            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;
            static_assert( INPUT_CHAN_MAX > 32, "INPUT_CHAN_MAX too small" );
            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 == 0 || new_fmt.audio.i_rate > 768000 )
                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;
            }
            if ( new_fmt.audio.i_channels > INPUT_CHAN_MAX )
            {
                msg_Err( p_demux, "too many channels detected %" PRIu8, new_fmt.audio.i_channels );
                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 );
}

Coverage Report

Created: 2025-10-10 06:26

Line	Count	Source
1		/*****************************************************************************
2		* voc.c : Creative Voice File (.VOC) demux module for vlc
3		*****************************************************************************
4		* Copyright (C) 2005 Rémi Denis-Courmont
5		*
6		* Authors: Rémi Denis-Courmont
7		*
8		* This program is free software; you can redistribute it and/or modify it
9		* under the terms of the GNU Lesser General Public License as published by
10		* the Free Software Foundation; either version 2.1 of the License, or
11		* (at your option) any later version.
12		*
13		* This program is distributed in the hope that it will be useful,
14		* but WITHOUT ANY WARRANTY; without even the implied warranty of
15		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16		* GNU Lesser General Public License for more details.
17		*
18		* You should have received a copy of the GNU Lesser General Public License
19		* along with this program; if not, write to the Free Software Foundation,
20		* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21		*****************************************************************************/
22
23		/*****************************************************************************
24		* Preamble
25		*****************************************************************************/
26
27		#ifdef HAVE_CONFIG_H
28		# include "config.h"
29		#endif
30
31		#include <assert.h>
32
33		#include <vlc_common.h>
34		#include <vlc_plugin.h>
35		#include <vlc_demux.h>
36
37		/*****************************************************************************
38		* Module descriptor
39		*****************************************************************************/
40		static int Open ( vlc_object_t * );
41
42	108	vlc_module_begin ()
43	54	set_description( N_("VOC demuxer") )
44	54	set_subcategory( SUBCAT_INPUT_DEMUX )
45	54	set_capability( "demux", 10 )
46	54	set_callback( Open )
47	54	add_file_extension("voc")
48	54	vlc_module_end ()
49
50		/*****************************************************************************
51		* Local prototypes
52		*****************************************************************************/
53		static int Demux ( demux_t * );
54		static int Control( demux_t *, int i_query, va_list args );
55
56		typedef struct
57		{
58		es_format_t fmt;
59		es_out_id_t *p_es;
60
61		int64_t i_block_start;
62		int64_t i_block_end;
63
64		int64_t i_loop_offset;
65		unsigned i_loop_count;
66		unsigned i_silence_countdown;
67
68		date_t pts;
69		} demux_sys_t;
70
71		static const char ct_header[] = "Creative Voice File\x1a";
72
73		/*****************************************************************************
74		* Open: check file and initializes structures
75		*****************************************************************************/
76		static int Open( vlc_object_t * p_this )
77	1.53k	{
78	1.53k	demux_t p_demux = (demux_t)p_this;
79	1.53k	const uint8_t *p_buf;
80	1.53k	uint16_t i_data_offset, i_version;
81
82	1.53k	if( vlc_stream_Peek( p_demux->s, &p_buf, 26 ) < 26 )
83	11	return VLC_EGENERIC;
84
85	1.52k	if( memcmp( p_buf, ct_header, 20 ) )
86	398	return VLC_EGENERIC;
87	1.13k	p_buf += 20;
88
89	1.13k	i_data_offset = GetWLE( p_buf );
90	1.13k	if ( i_data_offset < 26 /* not enough room for full VOC header */ )
91	5	return VLC_EGENERIC;
92	1.12k	p_buf += 2;
93
94	1.12k	i_version = GetWLE( p_buf );
95	1.12k	if( ( i_version != 0x10A ) && ( i_version != 0x114 ) )
96	25	return VLC_EGENERIC; /* unknown VOC version */
97	1.10k	p_buf += 2;
98
99	1.10k	if( GetWLE( p_buf ) != (uint16_t)(0x1234 + ~i_version) )
100	24	return VLC_EGENERIC;
101
102		/* We have a valid VOC header */
103	1.07k	msg_Dbg( p_demux, "CT Voice file v%d.%d", i_version >> 8,
104	1.07k	i_version & 0xff );
105
106		/* skip VOC header */
107	1.07k	if( vlc_stream_Read( p_demux->s, NULL, i_data_offset ) != i_data_offset )
108	37	return VLC_EGENERIC;
109
110	1.03k	demux_sys_t p_sys = vlc_obj_malloc( p_this, sizeof (p_sys) );
111	1.03k	if( unlikely(p_sys == NULL) )
112	0	return VLC_ENOMEM;
113
114	1.03k	p_sys->i_silence_countdown = p_sys->i_block_start = p_sys->i_block_end =
115	1.03k	p_sys->i_loop_count = 0;
116	1.03k	p_sys->p_es = NULL;
117
118	1.03k	date_Init( &p_sys->pts, 1, 1 );
119	1.03k	date_Set( &p_sys->pts, VLC_TICK_0 );
120
121	1.03k	es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
122	1.03k	p_demux->pf_demux = Demux;
123	1.03k	p_demux->pf_control = Control;
124	1.03k	p_demux->p_sys = p_sys;
125
126	1.03k	return VLC_SUCCESS;
127	1.03k	}
128
129		static int fmtcmp( es_format_t ofmt, es_format_t nfmt )
130	5.77M	{
131	5.77M	return (ofmt->audio.i_bitspersample != nfmt->audio.i_bitspersample)
132	4.41M	\|\| (ofmt->audio.i_rate != nfmt->audio.i_rate)
133	2.62M	\|\| (ofmt->audio.i_channels != nfmt->audio.i_channels);
134	5.77M	}
135
136
137		/*
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)
141		*/
142		static unsigned int fix_voc_sr( unsigned int sr )
143	5.32M	{
144	5.32M	switch( sr )
145	5.32M	{
146		/*case 8000:
147		return 8000;*/
148	512k	case 11111:
149	512k	return 11025;
150
151	315k	case 22222:
152	315k	return 22050;
153
154	0	case 44444:
155	0	return 44100;
156	5.32M	}
157	4.49M	return sr;
158	5.32M	}
159
160		static int ReadBlockHeader( demux_t *p_demux )
161	12.2M	{
162	12.2M	es_format_t new_fmt;
163	12.2M	uint8_t buf[8];
164	12.2M	int32_t i_block_size;
165	12.2M	demux_sys_t *p_sys = p_demux->p_sys;
166
167	12.2M	if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 )
168	367	return VLC_EGENERIC; /* EOF */
169
170	12.2M	i_block_size = GetDWLE( buf ) >> 8;
171	12.2M	msg_Dbg( p_demux, "new block: type: %u, size: %u",
172	12.2M	(unsigned)*buf, i_block_size );
173
174	12.2M	es_format_Init( &new_fmt, AUDIO_ES, 0 );
175
176	12.2M	switch( *buf )
177	12.2M	{
178	10	case 0: /* not possible : caught with earlier vlc_stream_Read */
179	10	goto corrupt;
180
181	2.73M	case 1:
182	2.73M	if( i_block_size < 2 )
183	2	goto corrupt;
184	2.73M	i_block_size -= 2;
185
186	2.73M	if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 )
187	27	goto corrupt;
188
189	2.73M	switch( buf[1] ) /* codec id */
190	2.73M	{
191	275k	case 0x0:
192	275k	new_fmt.i_codec = VLC_CODEC_U8;
193	275k	new_fmt.audio.i_bytes_per_frame = 1;
194	275k	new_fmt.audio.i_bitspersample = 8;
195	275k	break;
196	306k	case 0x1:
197	306k	new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_4;
198	306k	new_fmt.audio.i_bytes_per_frame = 1;
199	306k	new_fmt.audio.i_bitspersample = 4;
200	306k	break;
201	221k	case 0x2:
202	221k	new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_3;
203	221k	new_fmt.audio.i_bytes_per_frame = 3;
204	221k	new_fmt.audio.i_bitspersample = 3;
205	221k	break;
206	425k	case 0x3:
207	425k	new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_2;
208	425k	new_fmt.audio.i_bytes_per_frame = 1;
209	425k	new_fmt.audio.i_bitspersample = 2;
210	425k	break;
211	226k	case 0x4:
212	226k	new_fmt.i_codec = VLC_CODEC_S16L;
213	226k	new_fmt.audio.i_bytes_per_frame = 2;
214	226k	new_fmt.audio.i_bitspersample = 16;
215	226k	break;
216	753k	case 0x6:
217	753k	new_fmt.i_codec = VLC_CODEC_ALAW;
218	753k	new_fmt.audio.i_bytes_per_frame = 1;
219	753k	new_fmt.audio.i_bitspersample = 8;
220	753k	break;
221	527k	case 0x7:
222	527k	new_fmt.i_codec = VLC_CODEC_MULAW;
223	527k	new_fmt.audio.i_bytes_per_frame = 1;
224	527k	new_fmt.audio.i_bitspersample = 8;
225	527k	break;
226	5	default:
227	5	msg_Err( p_demux, "unsupported compression 0x%"PRIx8, buf[1] );
228	5	return VLC_EGENERIC;
229	2.73M	}
230
231	2.73M	new_fmt.audio.i_channels = 1;
232	2.73M	new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
233
234	2.73M	new_fmt.audio.i_frame_length = new_fmt.audio.i_bytes_per_frame * 8
235	2.73M	/ new_fmt.audio.i_bitspersample;
236
237	2.73M	new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
238	2.73M	new_fmt.i_bitrate = new_fmt.audio.i_rate * new_fmt.audio.i_bitspersample;
239
240	2.73M	break;
241
242	182k	case 2: /* data block with same format as the previous one */
243	182k	if( p_sys->p_es == NULL )
244	3	goto corrupt; /* no previous block! */
245
246	182k	memcpy( &new_fmt, &p_sys->fmt, sizeof( new_fmt ) );
247	182k	break;
248
249	2.58M	case 3: /* silence block */
250	2.58M	if( ( i_block_size != 3 )
251	2.58M	\|\| ( vlc_stream_Read( p_demux->s, buf, 3 ) < 3 ) )
252	31	goto corrupt;
253
254	2.58M	i_block_size = 0;
255	2.58M	p_sys->i_silence_countdown = GetWLE( buf );
256
257	2.58M	new_fmt.i_codec = VLC_CODEC_U8;
258	2.58M	new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
259	2.58M	new_fmt.audio.i_bytes_per_frame = 1;
260	2.58M	new_fmt.audio.i_frame_length = 1;
261	2.58M	new_fmt.audio.i_channels = 1;
262	2.58M	new_fmt.audio.i_blockalign = 1;
263	2.58M	new_fmt.audio.i_bitspersample = 8;
264	2.58M	new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
265	2.58M	break;
266
267	560	case 6: /* repeat block */
268	560	if( ( i_block_size != 2 )
269	536	\|\| ( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 ) )
270	27	goto corrupt;
271
272	533	i_block_size = 0;
273	533	p_sys->i_loop_count = GetWLE( buf );
274	533	p_sys->i_loop_offset = vlc_stream_Tell( p_demux->s );
275	533	break;
276
277	5.31M	case 7: /* repeat end block */
278	5.31M	if( i_block_size != 0 )
279	26	goto corrupt;
280
281	5.31M	if( p_sys->i_loop_count > 0 )
282	5.31M	{
283	5.31M	if( vlc_stream_Seek( p_demux->s, p_sys->i_loop_offset ) )
284	5.31M	msg_Warn( p_demux, "cannot loop: seek failed" );
285	5.31M	else
286	5.31M	p_sys->i_loop_count--;
287	5.31M	}
288	5.31M	break;
289
290	30.2k	case 8:
291		/*
292		* Block 8 is a big kludge to add stereo support to block 1 :
293		* A block of type 8 is always followed by a block of type 1
294		* and specifies the number of channels in that 1-block
295		* (normally block 1 are always mono). In practice, block type 9
296		* is used for stereo rather than 8
297		*/
298	30.2k	if( ( i_block_size != 4 )
299	30.2k	\|\| ( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 ) )
300	26	goto corrupt;
301
302	30.2k	if( buf[2] )
303	8	{
304	8	msg_Err( p_demux, "unsupported compression" );
305	8	return VLC_EGENERIC;
306	8	}
307
308	30.2k	new_fmt.i_codec = VLC_CODEC_U8;
309	30.2k	static_assert( INPUT_CHAN_MAX > 32, "INPUT_CHAN_MAX too small" );
310	30.2k	if (buf[3] >= 32)
311	3	goto corrupt;
312	30.2k	new_fmt.audio.i_channels = buf[3] + 1; /* can't be nul */
313	30.2k	new_fmt.audio.i_rate = 256000000L /
314	30.2k	((65536L - GetWLE(buf)) * new_fmt.audio.i_channels);
315	30.2k	new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels;
316	30.2k	new_fmt.audio.i_frame_length = 1;
317	30.2k	new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
318	30.2k	new_fmt.audio.i_bitspersample = 8 * new_fmt.audio.i_bytes_per_frame;
319	30.2k	new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
320
321		/* read subsequent block 1 */
322	30.2k	if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 )
323	9	return VLC_EGENERIC; /* EOF */
324
325	30.2k	i_block_size = GetDWLE( buf ) >> 8;
326	30.2k	msg_Dbg( p_demux, "new block: type: %u, size: %u",
327	30.2k	(unsigned)*buf, i_block_size );
328	30.2k	if( i_block_size < 2 )
329	10	goto corrupt;
330	30.2k	i_block_size -= 2;
331
332	30.2k	if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 )
333	31	goto corrupt;
334
335	30.1k	if( buf[1] )
336	8	{
337	8	msg_Err( p_demux, "unsupported compression" );
338	8	return VLC_EGENERIC;
339	8	}
340
341	30.1k	break;
342
343	747k	case 9: /* newer data block with channel number and bits resolution */
344	747k	if( i_block_size < 12 )
345	6	goto corrupt;
346	747k	i_block_size -= 12;
347
348	747k	if( ( vlc_stream_Read( p_demux->s, buf, 8 ) < 8 )
349	747k	\|\| vlc_stream_Read( p_demux->s, NULL, 4 ) != 4 )
350	32	goto corrupt;
351
352	747k	new_fmt.audio.i_rate = GetDWLE( buf );
353	747k	if( new_fmt.audio.i_rate == 0 \|\| new_fmt.audio.i_rate > 768000 )
354	37	goto corrupt;
355	747k	new_fmt.audio.i_bitspersample = buf[4];
356	747k	new_fmt.audio.i_channels = buf[5];
357
358	747k	switch( GetWLE( &buf[6] ) ) /* format */
359	747k	{
360	285k	case 0x0000: /* PCM */
361	285k	switch( new_fmt.audio.i_bitspersample )
362	285k	{
363	34.3k	case 8:
364	34.3k	new_fmt.i_codec = VLC_CODEC_U8;
365	34.3k	break;
366
367	250k	case 16:
368	250k	new_fmt.i_codec = VLC_CODEC_U16L;
369	250k	break;
370
371	5	default:
372	5	msg_Err( p_demux, "unsupported bit res.: %u bits",
373	5	new_fmt.audio.i_bitspersample );
374	5	return VLC_EGENERIC;
375	285k	}
376	285k	break;
377
378	462k	case 0x0004: /* signed */
379	462k	switch( new_fmt.audio.i_bitspersample )
380	462k	{
381	303k	case 8:
382	303k	new_fmt.i_codec = VLC_CODEC_S8;
383	303k	break;
384
385	158k	case 16:
386	158k	new_fmt.i_codec = VLC_CODEC_S16L;
387	158k	break;
388
389	2	default:
390	2	msg_Err( p_demux, "unsupported bit res.: %u bits",
391	2	new_fmt.audio.i_bitspersample );
392	2	return VLC_EGENERIC;
393	462k	}
394	462k	break;
395
396	462k	default:
397	9	msg_Err( p_demux, "unsupported compression" );
398	9	return VLC_EGENERIC;
399	747k	}
400
401	747k	if( new_fmt.audio.i_channels == 0 )
402	2	{
403	2	msg_Err( p_demux, "0 channels detected" );
404	2	return VLC_EGENERIC;
405	2	}
406	747k	if ( new_fmt.audio.i_channels > INPUT_CHAN_MAX )
407	4	{
408	4	msg_Err( p_demux, "too many channels detected %" PRIu8, new_fmt.audio.i_channels );
409	4	return VLC_EGENERIC;
410	4	}
411
412	747k	new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels
413	747k	* (new_fmt.audio.i_bitspersample / 8);
414	747k	new_fmt.audio.i_frame_length = 1;
415	747k	new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
416	747k	new_fmt.i_bitrate = 8 * new_fmt.audio.i_rate
417	747k	* new_fmt.audio.i_bytes_per_frame;
418	747k	break;
419
420	403k	default:
421	403k	msg_Dbg( p_demux, "unknown block type %u - skipping block",
422	403k	(unsigned)*buf);
423		/* fall through */
424	469k	case 4: /* blocks of non-audio types can be skipped */
425	625k	case 5:
426	625k	if(vlc_stream_Read( p_demux->s, NULL, i_block_size ) != i_block_size)
427	48	goto corrupt;
428	625k	i_block_size = 0;
429	625k	break;
430	12.2M	}
431
432	12.2M	p_sys->i_block_start = vlc_stream_Tell( p_demux->s );
433	12.2M	p_sys->i_block_end = p_sys->i_block_start + i_block_size;
434
435	12.2M	if( i_block_size \|\| p_sys->i_silence_countdown )
436	5.77M	{
437		/* we've read a block with data in it - update decoder */
438	5.77M	msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
439	5.77M	"freq: %d Hz, bitrate: %dKo/s, blockalign: %d, "
440	5.77M	"bits/samples: %d", (char *)&new_fmt.i_codec,
441	5.77M	new_fmt.audio.i_channels, new_fmt.audio.i_rate,
442	5.77M	new_fmt.i_bitrate / 8192, new_fmt.audio.i_blockalign,
443	5.77M	new_fmt.audio.i_bitspersample );
444
445	5.77M	if( ( p_sys->p_es != NULL ) && fmtcmp( &p_sys->fmt, &new_fmt ) )
446	3.16M	{
447	3.16M	msg_Dbg( p_demux, "codec change needed" );
448	3.16M	es_out_Del( p_demux->out, p_sys->p_es );
449	3.16M	p_sys->p_es = NULL;
450	3.16M	}
451
452	5.77M	if( p_sys->p_es == NULL )
453	3.16M	{
454	3.16M	memcpy( &p_sys->fmt, &new_fmt, sizeof( p_sys->fmt ) );
455	3.16M	date_Change( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
456	3.16M	p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
457	3.16M	if( unlikely(p_sys->p_es == NULL) )
458	0	return VLC_ENOMEM;
459	3.16M	}
460	5.77M	}
461
462	12.2M	return VLC_SUCCESS;
463
464	319	corrupt:
465	319	msg_Err( p_demux, "corrupted file - halting demux" );
466	319	return VLC_EGENERIC;
467	12.2M	}
468
469		/*****************************************************************************
470		* Demux: read packet and send them to decoders
471		*****************************************************************************
472		* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
473		*****************************************************************************/
474	115M	#define MAX_READ_FRAME 1000
475		static int Demux( demux_t *p_demux )
476	72.9M	{
477	72.9M	demux_sys_t *p_sys = p_demux->p_sys;
478	72.9M	block_t *p_block;
479	72.9M	int64_t i_read_frames;
480
481	72.9M	if( p_sys->i_silence_countdown == 0 )
482	16.4M	{
483	16.4M	int64_t i_offset = vlc_stream_Tell( p_demux->s );
484	16.4M	if( i_offset >= p_sys->i_block_end )
485	12.2M	{
486	12.2M	if( ReadBlockHeader( p_demux ) != VLC_SUCCESS )
487	738	return VLC_DEMUXER_EOF;
488	12.2M	return VLC_DEMUXER_SUCCESS;
489	12.2M	}
490
491	4.27M	i_read_frames = ( p_sys->i_block_end - i_offset )
492	4.27M	/ p_sys->fmt.audio.i_bytes_per_frame;
493
494	4.27M	if( i_read_frames > MAX_READ_FRAME )
495	1.07M	i_read_frames = MAX_READ_FRAME;
496
497	4.27M	p_block = vlc_stream_Block( p_demux->s,
498	4.27M	p_sys->fmt.audio.i_bytes_per_frame
499	4.27M	* i_read_frames );
500	4.27M	if( p_block == NULL )
501	301	{
502	301	msg_Warn( p_demux, "cannot read data" );
503	301	return VLC_DEMUXER_EOF;
504	301	}
505	4.27M	}
506	56.4M	else
507	56.4M	{ /* emulates silence from the stream */
508	56.4M	i_read_frames = p_sys->i_silence_countdown;
509	56.4M	if( i_read_frames > MAX_READ_FRAME )
510	53.8M	i_read_frames = MAX_READ_FRAME;
511
512	56.4M	p_block = block_Alloc( i_read_frames );
513	56.4M	if( p_block == NULL )
514	0	return VLC_ENOMEM;
515
516	56.4M	memset( p_block->p_buffer, 0, i_read_frames );
517	56.4M	p_sys->i_silence_countdown -= i_read_frames;
518	56.4M	}
519
520	60.6M	p_block->i_dts = p_block->i_pts = VLC_TICK_0 + date_Get( &p_sys->pts );
521	60.6M	p_block->i_nb_samples = i_read_frames * p_sys->fmt.audio.i_frame_length;
522	60.6M	date_Increment( &p_sys->pts, p_block->i_nb_samples );
523	60.6M	es_out_SetPCR( p_demux->out, p_block->i_pts );
524	60.6M	assert(p_sys->p_es != NULL);
525	60.6M	es_out_Send( p_demux->out, p_sys->p_es, p_block );
526
527	60.6M	return VLC_DEMUXER_SUCCESS;
528	60.6M	}
529
530		/*****************************************************************************
531		* Control:
532		*****************************************************************************/
533		static int Control( demux_t *p_demux, int i_query, va_list args )
534	0	{
535	0	demux_sys_t *p_sys = p_demux->p_sys;
536
537	0	return demux_vaControlHelper( p_demux->s, p_sys->i_block_start,
538	0	p_sys->i_block_end,
539	0	p_sys->fmt.i_bitrate,
540	0	p_sys->fmt.audio.i_blockalign,
541	0	i_query, args );
542	0	}