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vlc-2-2
Commit 058b1732 authored by Rafaël Carré's avatar Rafaël Carré
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flac packetizer: cosmetics 

C99, brace style, space
No functional changes
parent 75b67dbc
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Showing with 141 additions and 194 deletions
modules/packetizer/flac.c
View file @ 058b1732
......@@ -41,15 +41,15 @@
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
static int Open (vlc_object_t *);
static void Close(vlc_object_t *);
vlc_module_begin()
set_category( CAT_SOUT )
set_subcategory( SUBCAT_SOUT_PACKETIZER )
set_description( N_("Flac audio packetizer") )
set_capability( "packetizer", 50 )
set_callbacks( Open, Close )
set_category(CAT_SOUT)
set_subcategory(SUBCAT_SOUT_PACKETIZER)
set_description(N_("Flac audio packetizer"))
set_capability("packetizer", 50)
set_callbacks(Open, Close)
vlc_module_end()
/*****************************************************************************
......@@ -114,35 +114,35 @@ static const int pi_channels_maps[9] =
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static block_t *Packetize( decoder_t *, block_t ** );
static block_t *Packetize(decoder_t *, block_t **);
static int SyncInfo( decoder_t *, uint8_t *, unsigned int *,
unsigned int *, unsigned int * );
static int SyncInfo(decoder_t *, uint8_t *, unsigned int *,
unsigned int *, unsigned int *);
static uint64_t read_utf8( const uint8_t *p_buf, int *pi_read );
static uint8_t flac_crc8( const uint8_t *data, unsigned len );
static uint64_t read_utf8(const uint8_t *p_buf, int *pi_read);
static uint8_t flac_crc8(const uint8_t *data, unsigned len);
static int Open( vlc_object_t *p_this )
static int Open(vlc_object_t *p_this)
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
if( p_dec->fmt_in.i_codec != VLC_CODEC_FLAC )
if (p_dec->fmt_in.i_codec != VLC_CODEC_FLAC)
return VLC_EGENERIC;
/* */
p_dec->p_sys = p_sys = malloc(sizeof(*p_sys));
if( !p_sys )
if (!p_sys)
return VLC_ENOMEM;
date_Set( &p_sys->end_date, 0 );
date_Set(&p_sys->end_date, 0);
p_sys->i_state = STATE_NOSYNC;
p_sys->b_stream_info = false;
p_sys->i_pts = VLC_TS_INVALID;
block_BytestreamInit( &p_sys->bytestream );
block_BytestreamInit(&p_sys->bytestream);
/* */
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
es_format_Copy(&p_dec->fmt_out, &p_dec->fmt_in);
p_dec->fmt_out.i_cat = AUDIO_ES;
p_dec->fmt_out.i_codec = VLC_CODEC_FLAC;
......@@ -153,19 +153,19 @@ static int Open( vlc_object_t *p_this )
return VLC_SUCCESS;
}
static void Close( vlc_object_t *p_this )
static void Close(vlc_object_t *p_this)
{
decoder_t *p_dec = (decoder_t *)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
block_BytestreamRelease( &p_sys->bytestream );
free( p_sys );
block_BytestreamRelease(&p_sys->bytestream);
free(p_sys);
}
/*****************************************************************************
* ProcessHeader: process Flac header.
*****************************************************************************/
static void ProcessHeader( decoder_t *p_dec )
static void ProcessHeader(decoder_t *p_dec)
{
decoder_sys_t *p_sys = p_dec->p_sys;
......@@ -178,134 +178,115 @@ static void ProcessHeader( decoder_t *p_dec )
p_extra += 8;
}
if( p_dec->fmt_in.i_extra < 14 )
if (p_dec->fmt_in.i_extra < 14)
return;
bs_init( &bs, p_extra, i_extra);
bs_init(&bs, p_extra, i_extra);
p_sys->stream_info.min_blocksize = bs_read( &bs, 16 );
p_sys->stream_info.max_blocksize = bs_read( &bs, 16 );
p_sys->stream_info.min_blocksize = bs_read(&bs, 16);
p_sys->stream_info.max_blocksize = bs_read(&bs, 16);
p_sys->stream_info.min_framesize = bs_read( &bs, 24 );
p_sys->stream_info.max_framesize = bs_read( &bs, 24 );
p_sys->stream_info.min_framesize = bs_read(&bs, 24);
p_sys->stream_info.max_framesize = bs_read(&bs, 24);
p_sys->stream_info.sample_rate = bs_read( &bs, 20 );
p_sys->stream_info.channels = bs_read( &bs, 3 ) + 1;
p_sys->stream_info.bits_per_sample = bs_read( &bs, 5 ) + 1;
p_sys->stream_info.sample_rate = bs_read(&bs, 20);
p_sys->stream_info.channels = bs_read(&bs, 3) + 1;
p_sys->stream_info.bits_per_sample = bs_read(&bs, 5) + 1;
p_sys->b_stream_info = true;
p_dec->fmt_out.i_extra = i_extra;
p_dec->fmt_out.p_extra = xrealloc( p_dec->fmt_out.p_extra, i_extra );
memcpy( p_dec->fmt_out.p_extra, p_extra, i_extra );
p_dec->fmt_out.p_extra = xrealloc(p_dec->fmt_out.p_extra, i_extra);
memcpy(p_dec->fmt_out.p_extra, p_extra, i_extra);
}
/* */
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
static block_t *Packetize(decoder_t *p_dec, block_t **pp_block)
{
decoder_sys_t *p_sys = p_dec->p_sys;
uint8_t p_header[MAX_FLAC_HEADER_SIZE];
block_t *p_sout_block;
if( !pp_block || !*pp_block ) return NULL;
if (!pp_block || !*pp_block)
return NULL;
if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
{
if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
{
if ((*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) {
if ((*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED) {
p_sys->i_state = STATE_NOSYNC;
block_BytestreamEmpty( &p_sys->bytestream );
block_BytestreamEmpty(&p_sys->bytestream);
}
date_Set( &p_sys->end_date, 0 );
block_Release( *pp_block );
date_Set(&p_sys->end_date, 0);
block_Release(*pp_block);
return NULL;
}
if( !p_sys->b_stream_info )
ProcessHeader( p_dec );
if (!p_sys->b_stream_info)
ProcessHeader(p_dec);
if( p_sys->stream_info.channels > 8 )
{
msg_Err( p_dec, "This stream uses too many audio channels" );
if (p_sys->stream_info.channels > 8) {
msg_Err(p_dec, "This stream uses too many audio channels");
return NULL;
}
if( !date_Get( &p_sys->end_date ) && (*pp_block)->i_pts <= VLC_TS_INVALID )
{
if (!date_Get(&p_sys->end_date) && (*pp_block)->i_pts <= VLC_TS_INVALID) {
/* We've just started the stream, wait for the first PTS. */
block_Release( *pp_block );
block_Release(*pp_block);
return NULL;
}
else if( !date_Get( &p_sys->end_date ) )
{
} else if (!date_Get(&p_sys->end_date)) {
/* The first PTS is as good as anything else. */
p_sys->i_rate = p_dec->fmt_out.audio.i_rate;
date_Init( &p_sys->end_date, p_sys->i_rate, 1 );
date_Set( &p_sys->end_date, (*pp_block)->i_pts );
date_Init(&p_sys->end_date, p_sys->i_rate, 1);
date_Set(&p_sys->end_date, (*pp_block)->i_pts);
}
block_BytestreamPush( &p_sys->bytestream, *pp_block );
block_BytestreamPush(&p_sys->bytestream, *pp_block);
while( 1 )
{
switch( p_sys->i_state )
{
while (1) {
switch (p_sys->i_state) {
case STATE_NOSYNC:
while( block_PeekBytes( &p_sys->bytestream, p_header, 2 )
== VLC_SUCCESS )
{
if( p_header[0] == 0xFF && (p_header[1] & 0xFE) == 0xF8 )
{
while (block_PeekBytes(&p_sys->bytestream, p_header, 2)
== VLC_SUCCESS) {
if (p_header[0] == 0xFF && (p_header[1] & 0xFE) == 0xF8) {
p_sys->i_state = STATE_SYNC;
break;
}
block_SkipByte( &p_sys->bytestream );
block_SkipByte(&p_sys->bytestream);
}
if( p_sys->i_state != STATE_SYNC )
{
block_BytestreamFlush( &p_sys->bytestream );
/* Need more data */
return NULL;
if (p_sys->i_state != STATE_SYNC) {
block_BytestreamFlush(&p_sys->bytestream);
return NULL; /* Need more data */
}
case STATE_SYNC:
/* New frame, set the Presentation Time Stamp */
p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
if( p_sys->i_pts > VLC_TS_INVALID &&
p_sys->i_pts != date_Get( &p_sys->end_date ) )
{
date_Set( &p_sys->end_date, p_sys->i_pts );
}
if (p_sys->i_pts > VLC_TS_INVALID &&
p_sys->i_pts != date_Get(&p_sys->end_date))
date_Set(&p_sys->end_date, p_sys->i_pts);
p_sys->i_state = STATE_HEADER;
case STATE_HEADER:
/* Get FLAC frame header (MAX_FLAC_HEADER_SIZE bytes) */
if( block_PeekBytes( &p_sys->bytestream, p_header,
MAX_FLAC_HEADER_SIZE ) != VLC_SUCCESS )
{
/* Need more data */
return NULL;
}
if (block_PeekBytes(&p_sys->bytestream, p_header,
MAX_FLAC_HEADER_SIZE) != VLC_SUCCESS)
return NULL; /* Need more data */
/* Check if frame is valid and get frame info */
p_sys->i_frame_length = SyncInfo( p_dec, p_header,
p_sys->i_frame_length = SyncInfo(p_dec, p_header,
&p_sys->i_channels,
&p_sys->i_rate,
&p_sys->i_bits_per_sample );
if( !p_sys->i_frame_length )
{
msg_Dbg( p_dec, "emulated sync word" );
block_SkipByte( &p_sys->bytestream );
&p_sys->i_bits_per_sample);
if (!p_sys->i_frame_length) {
msg_Dbg(p_dec, "emulated sync word");
block_SkipByte(&p_sys->bytestream);
p_sys->i_state = STATE_NOSYNC;
break;
}
if( p_sys->i_rate != p_dec->fmt_out.audio.i_rate )
{
if (p_sys->i_rate != p_dec->fmt_out.audio.i_rate) {
p_dec->fmt_out.audio.i_rate = p_sys->i_rate;
const mtime_t i_end_date = date_Get( &p_sys->end_date );
date_Init( &p_sys->end_date, p_sys->i_rate, 1 );
date_Set( &p_sys->end_date, i_end_date );
const mtime_t i_end_date = date_Get(&p_sys->end_date);
date_Init(&p_sys->end_date, p_sys->i_rate, 1);
date_Set(&p_sys->end_date, i_end_date);
}
p_sys->i_state = STATE_NEXT_SYNC;
p_sys->i_frame_size = p_sys->b_stream_info && p_sys->stream_info.min_framesize > 0 ?
......@@ -316,22 +297,19 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
* next sync word */
/* Check if next expected frame contains the sync word */
while( block_PeekOffsetBytes( &p_sys->bytestream,
while (block_PeekOffsetBytes(&p_sys->bytestream,
p_sys->i_frame_size, p_header,
MAX_FLAC_HEADER_SIZE )
== VLC_SUCCESS )
{
if( p_header[0] == 0xFF && (p_header[1] & 0xFE) == 0xF8 )
{
MAX_FLAC_HEADER_SIZE)
== VLC_SUCCESS) {
if (p_header[0] == 0xFF && (p_header[1] & 0xFE) == 0xF8) {
/* Check if frame is valid and get frame info */
int i_frame_length =
SyncInfo( p_dec, p_header,
SyncInfo(p_dec, p_header,
&p_sys->i_channels,
&p_sys->i_rate,
&p_sys->i_bits_per_sample );
&p_sys->i_bits_per_sample);
if( i_frame_length )
{
if (i_frame_length) {
p_sys->i_state = STATE_SEND_DATA;
break;
}
......@@ -339,12 +317,10 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
p_sys->i_frame_size++;
}
if( p_sys->i_state != STATE_SEND_DATA )
{
if( p_sys->b_stream_info && p_sys->stream_info.max_framesize > 0 &&
p_sys->i_frame_size > p_sys->stream_info.max_framesize )
{
block_SkipByte( &p_sys->bytestream );
if (p_sys->i_state != STATE_SEND_DATA) {
if (p_sys->b_stream_info && p_sys->stream_info.max_framesize > 0 &&
p_sys->i_frame_size > p_sys->stream_info.max_framesize) {
block_SkipByte(&p_sys->bytestream);
p_sys->i_state = STATE_NOSYNC;
return NULL;
}
......@@ -353,15 +329,15 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
}
case STATE_SEND_DATA:
p_sout_block = block_Alloc( p_sys->i_frame_size );
p_sout_block = block_Alloc(p_sys->i_frame_size);
/* Copy the whole frame into the buffer. When we reach this point
* we already know we have enough data available. */
block_GetBytes( &p_sys->bytestream, p_sout_block->p_buffer,
p_sys->i_frame_size );
block_GetBytes(&p_sys->bytestream, p_sout_block->p_buffer,
p_sys->i_frame_size);
/* Make sure we don't reuse the same pts twice */
if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
if (p_sys->i_pts == p_sys->bytestream.p_block->i_pts)
p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TS_INVALID;
p_dec->fmt_out.audio.i_channels = p_sys->i_channels;
......@@ -370,16 +346,16 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
pi_channels_maps[p_sys->stream_info.channels];
/* So p_block doesn't get re-added several times */
*pp_block = block_BytestreamPop( &p_sys->bytestream );
*pp_block = block_BytestreamPop(&p_sys->bytestream);
p_sys->i_state = STATE_NOSYNC;
/* Date management */
p_sout_block->i_pts =
p_sout_block->i_dts = date_Get( &p_sys->end_date );
date_Increment( &p_sys->end_date, p_sys->i_frame_length );
p_sout_block->i_dts = date_Get(&p_sys->end_date);
date_Increment(&p_sys->end_date, p_sys->i_frame_length);
p_sout_block->i_length =
date_Get( &p_sys->end_date ) - p_sout_block->i_pts;
date_Get(&p_sys->end_date) - p_sout_block->i_pts;
return p_sout_block;
}
......@@ -391,10 +367,10 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
/*****************************************************************************
* SyncInfo: parse FLAC sync info
*****************************************************************************/
static int SyncInfo( decoder_t *p_dec, uint8_t *p_buf,
static int SyncInfo(decoder_t *p_dec, uint8_t *p_buf,
unsigned int * pi_channels,
unsigned int * pi_sample_rate,
unsigned int * pi_bits_per_sample )
unsigned int * pi_bits_per_sample)
{
decoder_sys_t *p_sys = p_dec->p_sys;
int i_header, i_temp, i_read;
......@@ -402,17 +378,18 @@ static int SyncInfo( decoder_t *p_dec, uint8_t *p_buf,
int i_blocksize_hint = 0, i_sample_rate_hint = 0;
/* Check syncword */
if( p_buf[0] != 0xFF || (p_buf[1] & 0xFE) != 0xF8 ) return 0;
if (p_buf[0] != 0xFF || (p_buf[1] & 0xFE) != 0xF8)
return 0;
/* Check there is no emulated sync code in the rest of the header */
if( p_buf[2] == 0xff || p_buf[3] == 0xFF ) return 0;
if (p_buf[2] == 0xff || p_buf[3] == 0xFF)
return 0;
/* Find blocksize (framelength) */
switch( i_temp = p_buf[2] >> 4 )
{
switch (i_temp = p_buf[2] >> 4) {
case 0:
if( p_sys->b_stream_info &&
p_sys->stream_info.min_blocksize == p_sys->stream_info.max_blocksize )
if (p_sys->b_stream_info &&
p_sys->stream_info.min_blocksize == p_sys->stream_info.max_blocksize)
i_blocksize = p_sys->stream_info.min_blocksize;
else return 0; /* We can't do anything with this */
break;
......@@ -444,16 +421,15 @@ static int SyncInfo( decoder_t *p_dec, uint8_t *p_buf,
i_blocksize = 256 << (i_temp - 8);
break;
}
if( p_sys->b_stream_info &&
( i_blocksize < p_sys->stream_info.min_blocksize ||
i_blocksize > p_sys->stream_info.max_blocksize ) )
if (p_sys->b_stream_info &&
(i_blocksize < p_sys->stream_info.min_blocksize ||
i_blocksize > p_sys->stream_info.max_blocksize))
return 0;
/* Find samplerate */
switch( i_temp = p_buf[2] & 0x0f )
{
switch (i_temp = p_buf[2] & 0x0f) {
case 0:
if( p_sys->b_stream_info )
if (p_sys->b_stream_info)
*pi_sample_rate = p_sys->stream_info.sample_rate;
else return 0; /* We can't do anything with this */
break;
......@@ -514,22 +490,17 @@ static int SyncInfo( decoder_t *p_dec, uint8_t *p_buf,
/* Find channels */
i_temp = (unsigned)(p_buf[3] >> 4);
if( i_temp & 8 )
{
if( ( i_temp & 7 ) >= 3 )
if (i_temp & 8) {
if ((i_temp & 7) >= 3)
return 0;
*pi_channels = 2;
}
else
{
} else
*pi_channels = i_temp + 1;
}
/* Find bits per sample */
switch( i_temp = (unsigned)(p_buf[3] & 0x0e) >> 1 )
{
switch (i_temp = (unsigned)(p_buf[3] & 0x0e) >> 1) {
case 0:
if( p_sys->b_stream_info )
if (p_sys->b_stream_info)
*pi_bits_per_sample = p_sys->stream_info.bits_per_sample;
else
return 0;
......@@ -562,23 +533,21 @@ static int SyncInfo( decoder_t *p_dec, uint8_t *p_buf,
}
/* Zero padding bit */
if( p_buf[3] & 0x01 ) return 0;
if (p_buf[3] & 0x01) return 0;
/* End of fixed size header */
i_header = 4;
/* Check Sample/Frame number */
if( read_utf8( &p_buf[i_header++], &i_read ) == INT64_C(0xffffffffffffffff) )
if (read_utf8(&p_buf[i_header++], &i_read) == INT64_C(0xffffffffffffffff))
return 0;
i_header += i_read;
/* Read blocksize */
if( i_blocksize_hint )
{
if (i_blocksize_hint) {
int i_val1 = p_buf[i_header++];
if( i_blocksize_hint == 7 )
{
if (i_blocksize_hint == 7) {
int i_val2 = p_buf[i_header++];
i_val1 = (i_val1 << 8) | i_val2;
}
......@@ -586,88 +555,67 @@ static int SyncInfo( decoder_t *p_dec, uint8_t *p_buf,
}
/* Read sample rate */
if( i_sample_rate_hint )
{
if (i_sample_rate_hint) {
int i_val1 = p_buf[i_header++];
if( i_sample_rate_hint != 12 )
{
if (i_sample_rate_hint != 12) {
int i_val2 = p_buf[i_header++];
i_val1 = (i_val1 << 8) | i_val2;
}
if( i_sample_rate_hint == 12 ) *pi_sample_rate = i_val1 * 1000;
else if( i_sample_rate_hint == 13 ) *pi_sample_rate = i_val1;
if (i_sample_rate_hint == 12) *pi_sample_rate = i_val1 * 1000;
else if (i_sample_rate_hint == 13) *pi_sample_rate = i_val1;
else *pi_sample_rate = i_val1 * 10;
}
/* Check the CRC-8 byte */
if( flac_crc8( p_buf, i_header ) != p_buf[i_header] )
{
if (flac_crc8(p_buf, i_header) != p_buf[i_header])
return 0;
}
/* Sanity check using stream info header when possible */
if( p_sys->b_stream_info )
{
if( i_blocksize < p_sys->stream_info.min_blocksize ||
i_blocksize > p_sys->stream_info.max_blocksize )
if (p_sys->b_stream_info) {
if (i_blocksize < p_sys->stream_info.min_blocksize ||
i_blocksize > p_sys->stream_info.max_blocksize)
return 0;
if( *pi_bits_per_sample != p_sys->stream_info.bits_per_sample )
if (*pi_bits_per_sample != p_sys->stream_info.bits_per_sample)
return 0;
if( *pi_sample_rate != p_sys->stream_info.sample_rate )
if (*pi_sample_rate != p_sys->stream_info.sample_rate)
return 0;
}
return i_blocksize;
}
/* Will return 0xffffffffffffffff for an invalid utf-8 sequence */
static uint64_t read_utf8( const uint8_t *p_buf, int *pi_read )
static uint64_t read_utf8(const uint8_t *p_buf, int *pi_read)
{
uint64_t i_result = 0;
unsigned i, j;
unsigned i;
if( !(p_buf[0] & 0x80) ) /* 0xxxxxxx */
{
if (!(p_buf[0] & 0x80)) { /* 0xxxxxxx */
i_result = p_buf[0];
i = 0;
}
else if( p_buf[0] & 0xC0 && !(p_buf[0] & 0x20) ) /* 110xxxxx */
{
} else if (p_buf[0] & 0xC0 && !(p_buf[0] & 0x20)) { /* 110xxxxx */
i_result = p_buf[0] & 0x1F;
i = 1;
}
else if( p_buf[0] & 0xE0 && !(p_buf[0] & 0x10) ) /* 1110xxxx */
{
} else if (p_buf[0] & 0xE0 && !(p_buf[0] & 0x10)) { /* 1110xxxx */
i_result = p_buf[0] & 0x0F;
i = 2;
}
else if( p_buf[0] & 0xF0 && !(p_buf[0] & 0x08) ) /* 11110xxx */
{
} else if (p_buf[0] & 0xF0 && !(p_buf[0] & 0x08)) { /* 11110xxx */
i_result = p_buf[0] & 0x07;
i = 3;
}
else if( p_buf[0] & 0xF8 && !(p_buf[0] & 0x04) ) /* 111110xx */
{
} else if (p_buf[0] & 0xF8 && !(p_buf[0] & 0x04)) { /* 111110xx */
i_result = p_buf[0] & 0x03;
i = 4;
}
else if( p_buf[0] & 0xFC && !(p_buf[0] & 0x02) ) /* 1111110x */
{
} else if (p_buf[0] & 0xFC && !(p_buf[0] & 0x02)) { /* 1111110x */
i_result = p_buf[0] & 0x01;
i = 5;
}
else if( p_buf[0] & 0xFE && !(p_buf[0] & 0x01) ) /* 11111110 */
{
} else if (p_buf[0] & 0xFE && !(p_buf[0] & 0x01)) { /* 11111110 */
i_result = 0;
i = 6;
}
else {
} else {
return INT64_C(0xffffffffffffffff);
}
for( j = 1; j <= i; j++ )
{
if( !(p_buf[j] & 0x80) || (p_buf[j] & 0x40) ) /* 10xxxxxx */
{
for (unsigned j = 1; j <= i; j++) {
if (!(p_buf[j] & 0x80) || (p_buf[j] & 0x40)) { /* 10xxxxxx */
return INT64_C(0xffffffffffffffff);
}
i_result <<= 6;
......@@ -714,13 +662,12 @@ static const uint8_t flac_crc8_table[256] = {
0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
};
static uint8_t flac_crc8( const uint8_t *data, unsigned len )
static uint8_t flac_crc8(const uint8_t *data, unsigned len)
{
uint8_t crc = 0;
while(len--)
while (len--)
crc = flac_crc8_table[crc ^ *data++];
return crc;
}
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