Skip to content

V
vlc
Commit 8456ba1c authored by Laurent Aimar's avatar Laurent Aimar
Browse files
Options

* clean up some code, add "mp3" short cut. 

   And now if this demux has been forced it will (try) to play the whole
file even if the stream is heavily corrupted (like PS demux).
   But now, it makes less assumptions on the stream, so report any
problem if it mis-recognizes others files as mpeg audio (specially PS file).
parent 2f67ba3c
Hide whitespace changes
Inline Side-by-side
Showing with 449 additions and 345 deletions
modules/demux/mpeg/audio.c
View file @ 8456ba1c
/***************************************************************************** /*****************************************************************************
* mpeg_audio.c : mpeg_audio Stream input module for vlc * audio.c : mpeg audio Stream input module for vlc
***************************************************************************** *****************************************************************************
* Copyright (C) 2001 VideoLAN * Copyright (C) 2001 VideoLAN
* $Id: audio.c,v 1.3 2002/08/08 00:35:11 sam Exp $ * $Id: audio.c,v 1.4 2002/08/13 20:28:56 fenrir Exp $
* *
* Authors: Laurent Aimar <fenrir@via.ecp.fr> * Authors: Laurent Aimar <fenrir@via.ecp.fr>
* *
...@@ -38,16 +38,17 @@ ...@@ -38,16 +38,17 @@
static int Activate ( vlc_object_t * ); static int Activate ( vlc_object_t * );
static int Demux ( input_thread_t * ); static int Demux ( input_thread_t * );
/* TODO: support MPEG-2.5, not difficult */ /* TODO: support MPEG-2.5, not difficult, but I need somes samples... */
/***************************************************************************** /*****************************************************************************
* Module descriptor * Module descriptor
*****************************************************************************/ *****************************************************************************/
vlc_module_begin(); vlc_module_begin();
set_description( _("ISO 13818-3 MPEG I/II audio stream demux" ) ); set_description( _("MPEG I/II audio stream demux" ) );
set_capability( "demux", 100 ); set_capability( "demux", 50 );
set_callbacks( Activate, NULL ); set_callbacks( Activate, NULL );
add_shortcut( "mpegaudio" ); add_shortcut( "mpegaudio" );
add_shortcut( "mp3" );
vlc_module_end(); vlc_module_end();
/***************************************************************************** /*****************************************************************************
...@@ -59,16 +60,14 @@ vlc_module_end(); ...@@ -59,16 +60,14 @@ vlc_module_end();
/* it's you to choose */ /* it's you to choose */
#define MPEGAUDIO_MAXTESTPOS 0 #define MPEGAUDIO_MAXTESTPOS 0
#define MPEGAUDIO_MAXFRAMESIZE 1500 /* no exactly */ typedef struct mpeg_header_s
typedef struct mpegaudio_format_s
{ {
u32 i_header; u32 i_header;
int i_version; int i_version;
int i_layer; int i_layer;
int i_crc; int i_crc;
int i_bitrate; int i_bitrate;
int i_samplingfreq; int i_samplerate;
int i_padding; int i_padding;
int i_extension; int i_extension;
int i_mode; int i_mode;
...@@ -77,14 +76,14 @@ typedef struct mpegaudio_format_s ...@@ -77,14 +76,14 @@ typedef struct mpegaudio_format_s
int i_original; int i_original;
int i_emphasis; int i_emphasis;
} mpegaudio_format_t; } mpeg_header_t;
/* Xing Header if present */ /* Xing Header if present */
#define FRAMES_FLAG 0x0001 /* these flags is for i_flags */ #define FRAMES_FLAG 0x0001 /* these flags is for i_flags */
#define BYTES_FLAG 0x0002 /* because all is optionnal */ #define BYTES_FLAG 0x0002 /* because all is optionnal */
#define TOC_FLAG 0x0004 #define TOC_FLAG 0x0004
#define VBR_SCALE_FLAG 0x0008 #define VBR_SCALE_FLAG 0x0008
typedef struct mpegaudio_xing_header_s typedef struct xing_header_s
{ {
int i_flags; /* from Xing header data */ int i_flags; /* from Xing header data */
int i_frames; /* total bit stream frames from Xing header data */ int i_frames; /* total bit stream frames from Xing header data */
...@@ -92,37 +91,46 @@ typedef struct mpegaudio_xing_header_s ...@@ -92,37 +91,46 @@ typedef struct mpegaudio_xing_header_s
int i_vbr_scale; /* encoded vbr scale from Xing header data */ int i_vbr_scale; /* encoded vbr scale from Xing header data */
u8 i_toc[100]; /* for seek */ u8 i_toc[100]; /* for seek */
int i_avgbitrate; /* calculated, XXX: bits/sec not Kb */ int i_avgbitrate; /* calculated, XXX: bits/sec not Kb */
} mpegaudio_xing_header_t; } xing_header_t;
struct demux_sys_t struct demux_sys_t
{ {
mtime_t i_pts; mtime_t i_pts;
int i_framecount; es_descriptor_t *p_es;
mpeg_header_t mpeg;
es_descriptor_t *p_es; xing_header_t xingheader;
mpegaudio_format_t mpeg;
mpegaudio_xing_header_t xingheader; /* extracted information */
int i_samplerate;
int i_samplelength;
int i_framelength;
}; };
static int mpegaudio_bitrate[2][3][16] = static int mpegaudio_bitrate[2][3][16] =
{ {
{ {
{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0 }, /* v1 l1 */ /* v1 l1 */
{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0 }, /* v1 l2 */ { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0},
{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 } /* v1 l3 */ /* v1 l2 */
}, { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0},
/* v1 l3 */
{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}
},
{ {
{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0 }, /* v2 l1 */ /* v2 l1 */
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 }, /* v2 l2 */ { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0},
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 } /* v2 l3 */ /* v2 l2 */
} { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0},
/* v2 l3 */
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}
}
}; };
static int mpegaudio_samplingfreq[2][4] = /* version 1 then 2 */ static int mpegaudio_samplerate[2][4] = /* version 1 then 2 */
{ {
{ 44100, 48000, 32000, 0 }, { 44100, 48000, 32000, 0 },
{ 22050, 24000, 16000, 0 } { 22050, 24000, 16000, 0 }
...@@ -133,39 +141,88 @@ static char* mpegaudio_mode[4] = ...@@ -133,39 +141,88 @@ static char* mpegaudio_mode[4] =
"stereo", "joint stereo", "dual channel", "mono" "stereo", "joint stereo", "dual channel", "mono"
}; };
static inline u32 __GetDWBE( byte_t *p_buff ) static inline u32 GetDWBE( u8 *p_buff )
{ {
return( ( (*(p_buff)) << 24 ) + ( (*(p_buff+1)) << 16 ) + return( ( p_buff[0] << 24 )|( p_buff[1] << 16 )|
( (*(p_buff+2)) << 8 ) + ( (*(p_buff+3)) ) ); ( p_buff[2] << 8 )|( p_buff[3] ) );
} }
static int __CheckPS( input_thread_t *p_input ) /*****************************************************************************
* Function to manipulate stream easily
*****************************************************************************
*
* SkipBytes : skip bytes, not yet optimised, read bytes to be skipped :P
*
* ReadPes : read data and make a PES
*
*****************************************************************************/
static int SkipBytes( input_thread_t *p_input, int i_size )
{ {
byte_t *p_buff; data_packet_t *p_data;
int i_size = input_Peek( p_input, &p_buff, 8196 ); int i_read;
while( i_size > 0 ) while( i_size > 0 )
{ {
if( !(*p_buff) && !(*(p_buff + 1)) i_read = input_SplitBuffer(p_input, &p_data, __MIN( i_size, 1024 ) );
&& (*(p_buff + 2) == 1 ) && (*(p_buff + 3) >= 0xB9 ) ) if( i_read <= 0 )
{ {
return( 1 ); /* it could be ps so ...*/ return( 0 );
} }
p_buff++; input_DeletePacket( p_input->p_method_data, p_data );
i_size--; i_size -= i_read;
} }
return( 0 ); return( 1 );
}
static int ReadPES( input_thread_t *p_input,
pes_packet_t **pp_pes,
int i_size )
{
pes_packet_t *p_pes;
*pp_pes = NULL;
if( !(p_pes = input_NewPES( p_input->p_method_data )) )
{
msg_Err( p_input, "cannot allocate new PES" );
return( 0 );
}
while( i_size > 0 )
{
data_packet_t *p_data;
int i_read;
if( (i_read = input_SplitBuffer( p_input,
&p_data,
__MIN( i_size, 1024 ) ) ) <= 0 )
{
input_DeletePES( p_input->p_method_data, p_pes );
return( 0 );
}
if( !p_pes->p_first )
{
p_pes->p_first = p_data;
p_pes->i_nb_data = 1;
p_pes->i_pes_size = i_read;
}
else
{
p_pes->p_last->p_next = p_data;
p_pes->i_nb_data++;
p_pes->i_pes_size += i_read;
}
p_pes->p_last = p_data;
i_size -= i_read;
}
*pp_pes = p_pes;
return( 1 );
} }
/*
#define __GetDWBE( p_buff ) \
( ( (*(p_buff)) << 24 ) + ( (*(p_buff+1)) << 16 ) + \
( (*(p_buff+2)) << 8 ) + ( (*(p_buff+3)) ) )
*/
/***************************************************************************** /*****************************************************************************
* MPEGAudio_CheckHeader : Test the validity of the header * CheckHeader : Test the validity of the header
*****************************************************************************/ *****************************************************************************/
static int MPEGAudio_CheckHeader( u32 i_header ) static int CheckHeader( u32 i_header )
{ {
if( ((( i_header >> 20 )&0x0FFF) != 0x0FFF ) /* header sync */ if( ((( i_header >> 20 )&0x0FFF) != 0x0FFF ) /* header sync */
|| (((i_header >> 17)&0x03) == 0 ) /* valid layer ?*/ || (((i_header >> 17)&0x03) == 0 ) /* valid layer ?*/
...@@ -180,16 +237,62 @@ static int MPEGAudio_CheckHeader( u32 i_header ) ...@@ -180,16 +237,62 @@ static int MPEGAudio_CheckHeader( u32 i_header )
} }
/***************************************************************************** /*****************************************************************************
* MPEGAudio_ParseHeader : Parse a header ;) * DecodedFrameSize : give the length of the decoded pcm data
*****************************************************************************/ *****************************************************************************/
static void MPEGAudio_ParseHeader( u32 i_header, mpegaudio_format_t *p_mpeg ) static int DecodedFrameSize( mpeg_header_t *p_mpeg )
{ {
switch( p_mpeg->i_layer )
{
case( 0 ): /* layer 1 */
return( 384);
case( 1 ): /* layer 2 */
return( 1152 );
case( 2 ): /* layer 3 */
return( !p_mpeg->i_version ? 1152 : 576 );
/* XXX: perhaps we have to /2 for all layer but i'm not sure */
}
return( 0 );
}
/****************************************************************************
* GetHeader : find an mpeg header and load it
****************************************************************************/
static int GetHeader( input_thread_t *p_input,
mpeg_header_t *p_mpeg,
int i_max_pos,
int *pi_skip )
{
u32 i_header;
u8 *p_peek;
int i_size;
*pi_skip = 0;
i_size = input_Peek( p_input, &p_peek, i_max_pos + 4 );
for( ; ; )
{
if( i_size < 4 )
{
return( 0 );
}
if( !CheckHeader( GetDWBE( p_peek ) ) )
{
p_peek++;
i_size--;
*pi_skip += 1;
continue;
}
/* we found an header, load it */
break;
}
i_header = GetDWBE( p_peek );
p_mpeg->i_header = i_header; p_mpeg->i_header = i_header;
p_mpeg->i_version = 1 - ( ( i_header >> 19 ) & 0x01 ); p_mpeg->i_version = 1 - ( ( i_header >> 19 ) & 0x01 );
p_mpeg->i_layer = 3 - ( ( i_header >> 17 ) & 0x03 ); p_mpeg->i_layer = 3 - ( ( i_header >> 17 ) & 0x03 );
p_mpeg->i_crc = 1 - (( i_header >> 16 ) & 0x01); p_mpeg->i_crc = 1 - (( i_header >> 16 ) & 0x01);
p_mpeg->i_bitrate = mpegaudio_bitrate[p_mpeg->i_version][p_mpeg->i_layer][(i_header>>12)&0x0F]; p_mpeg->i_bitrate =
p_mpeg->i_samplingfreq = mpegaudio_samplingfreq[p_mpeg->i_version][(i_header>>10)&0x03]; mpegaudio_bitrate[p_mpeg->i_version][p_mpeg->i_layer][(i_header>>12)&0x0F];
p_mpeg->i_samplerate = mpegaudio_samplerate[p_mpeg->i_version][(i_header>>10)&0x03];
p_mpeg->i_padding = (( i_header >> 9 ) & 0x01); p_mpeg->i_padding = (( i_header >> 9 ) & 0x01);
p_mpeg->i_extension = ( i_header >> 7 ) & 0x01; p_mpeg->i_extension = ( i_header >> 7 ) & 0x01;
p_mpeg->i_mode = ( i_header >> 6 ) & 0x03; p_mpeg->i_mode = ( i_header >> 6 ) & 0x03;
...@@ -197,52 +300,155 @@ static void MPEGAudio_ParseHeader( u32 i_header, mpegaudio_format_t *p_mpeg ) ...@@ -197,52 +300,155 @@ static void MPEGAudio_ParseHeader( u32 i_header, mpegaudio_format_t *p_mpeg )
p_mpeg->i_copyright = ( i_header >> 3 ) & 0x01; p_mpeg->i_copyright = ( i_header >> 3 ) & 0x01;
p_mpeg->i_original = ( i_header >> 2 ) & 0x01; p_mpeg->i_original = ( i_header >> 2 ) & 0x01;
p_mpeg->i_emphasis = ( i_header ) & 0x03; p_mpeg->i_emphasis = ( i_header ) & 0x03;
return( 1 );
} }
/***************************************************************************** /*****************************************************************************
* MPEGAudio_FrameSize : give the size of a frame in the mpeg stream * ExtractXingHeader : extract a Xing header if exist
*****************************************************************************
* It also calcul avgbitrate, using Xing header if present or assume that
* the bitrate of the first frame is the same for the all file
*****************************************************************************/ *****************************************************************************/
static int MPEGAudio_FrameSize( mpegaudio_format_t *p_mpeg ) static void ExtractXingHeader( input_thread_t *p_input,
xing_header_t *p_xh )
{ {
/* XXX if crc do i need to add 2 bytes or not? */ int i_skip;
switch( p_mpeg->i_layer ) int i_size;
u8 *p_peek;
mpeg_header_t mpeg;
p_xh->i_flags = 0; /* nothing present */
if( !( GetHeader( p_input,
&mpeg,
8192,
&i_skip ) ) )
{ {
case( 0 ): msg_Err( p_input, "ExtractXingHeader failed, shouldn't ..." );
return( ( ( ( !p_mpeg->i_version ? 12000 : 6000 ) * return;
p_mpeg->i_bitrate ) / }
p_mpeg->i_samplingfreq + p_mpeg->i_padding ) * 4);
case( 1 ): p_xh->i_avgbitrate = mpeg.i_bitrate * 1000; /* default */
case( 2 ):
return( ( ( !p_mpeg->i_version ? 144000 : 72000 ) * /* 1024 is enougth */
p_mpeg->i_bitrate ) / if( ( i_size = input_Peek( p_input, &p_peek, 1024 + i_skip ) ) < 8 )
p_mpeg->i_samplingfreq + p_mpeg->i_padding ); {
return;
}
p_peek += i_skip;
i_size -= i_skip;
/* calculate pos of xing header */
if( !mpeg.i_version )
{
p_peek += mpeg.i_mode != 3 ? 36 : 21;
i_size -= mpeg.i_mode != 3 ? 36 : 21;
}
else
{
p_peek += mpeg.i_mode != 3 ? 21 : 13;
i_size -= mpeg.i_mode != 3 ? 21 : 13;
}
if( i_size < 8 )
{
return;
}
if( ( p_peek[0] != 'X' )||( p_peek[1] != 'i' )||
( p_peek[2] != 'n' )||( p_peek[3] != 'g' ) )
{
return;
}
else
{
msg_Dbg( p_input, "Xing header is present" );
p_peek += 4;
i_size -= 4;
}
if( i_size < 4 )
{
return;
}
else
{
p_xh->i_flags = GetDWBE( p_peek );
p_peek += 4;
i_size -= 4;
}
if( ( p_xh->i_flags&FRAMES_FLAG )&&( i_size >= 4 ) )
{
p_xh->i_frames = GetDWBE( p_peek );
p_peek += 4;
i_size -= 4;
}
if( ( p_xh->i_flags&BYTES_FLAG ) &&( i_size >= 4 ) )
{
p_xh->i_bytes = GetDWBE( p_peek );
p_peek += 4;
i_size -= 4;
}
if( ( p_xh->i_flags&TOC_FLAG ) &&( i_size >= 100 ) )
{
memcpy( p_xh->i_toc, p_peek, 100 );
p_peek += 100;
i_size -= 100;
}
if( ( p_xh->i_flags&VBR_SCALE_FLAG ) &&( i_size >= 4 ) )
{
p_xh->i_vbr_scale = GetDWBE( p_peek );
p_peek += 4;
i_size -= 4;
}
if( ( p_xh->i_flags&FRAMES_FLAG )&&( p_xh->i_flags&BYTES_FLAG ) )
{
p_xh->i_avgbitrate =
((u64)p_xh->i_bytes * (u64)8 * (u64)mpeg.i_samplerate) /
((u64)p_xh->i_frames * (u64)DecodedFrameSize( &mpeg ) );
} }
return( 1024 ); /* must never happen, 1k to advance in stream*/
} }
/***************************************************************************** /****************************************************************************
* MPEGAudio_DecodedFrameSize : give the length of the decoded pcm data * ExtractConfiguration : extract usefull informations from mpeg_header_t
*****************************************************************************/ ****************************************************************************/
static int MPEGAudio_DecodedFrameSize( mpegaudio_format_t *p_mpeg ) static void ExtractConfiguration( demux_sys_t *p_demux )
{ {
switch( p_mpeg->i_layer ) p_demux->i_samplerate = p_demux->mpeg.i_samplerate;
p_demux->i_samplelength = DecodedFrameSize( &p_demux->mpeg );
/* XXX if crc do i need to add 2 bytes or not? */
switch( p_demux->mpeg.i_layer )
{ {
case( 0 ): /* layer 1 */ case( 0 ):
return( 384); p_demux->i_framelength =
case( 1 ): /* layer 2 */ ( ( ( !p_demux->mpeg.i_version ? 12000 : 6000 ) *
return( 1152 ); p_demux->mpeg.i_bitrate ) /
case( 2 ): /* layer 3 */ p_demux->mpeg.i_samplerate + p_demux->mpeg.i_padding ) * 4;
return( !p_mpeg->i_version ? 1152 : 576 ); case( 1 ):
/* XXX: perhaps we have to /2 for all layer but i'm not sure */ case( 2 ):
p_demux->i_framelength =
( ( !p_demux->mpeg.i_version ? 144000 : 72000 ) *
p_demux->mpeg.i_bitrate ) /
p_demux->mpeg.i_samplerate + p_demux->mpeg.i_padding;
} }
return( 0 );
} }
static int MPEGAudio_SkipID3Tag( input_thread_t *p_input ) /****************************************************************************
* SkipID3Tag : check if an ID3 header is present and skip it
****************************************************************************
*
* Author : Sigmund Augdal
*
****************************************************************************/
static int SkipID3Tag( input_thread_t *p_input )
{ {
int count; int count;
byte_t *p_peek; u8 *p_peek;
byte_t version, revision; u8 version, revision;
int b_footer; int b_footer;
int i_size; int i_size;
...@@ -253,13 +459,6 @@ static int MPEGAudio_SkipID3Tag( input_thread_t *p_input ) ...@@ -253,13 +459,6 @@ static int MPEGAudio_SkipID3Tag( input_thread_t *p_input )
msg_Err( p_input, "cannot peek()" ); msg_Err( p_input, "cannot peek()" );
return( -1 ); return( -1 );
} }
/*
msg_Info( p_input, "Three first bytes are: %d %d %d",
p_peek[0],
p_peek[1],
p_peek[2]
);
*/
if ( !( (p_peek[0] == 0x49) && (p_peek[1] == 0x44) && (p_peek[2] == 0x33))) if ( !( (p_peek[0] == 0x49) && (p_peek[1] == 0x44) && (p_peek[2] == 0x33)))
{ {
return( 0 ); return( 0 );
...@@ -290,156 +489,56 @@ static int MPEGAudio_SkipID3Tag( input_thread_t *p_input ) ...@@ -290,156 +489,56 @@ static int MPEGAudio_SkipID3Tag( input_thread_t *p_input )
return (0); return (0);
} }
/***************************************************************************** /****************************************************************************
* MPEGAudio_FindFrame : Find a header that could be valid. * CheckPS : check if this stream could be some ps,
***************************************************************************** * yes it's ugly ... but another idea ?
* The idea is to search for 2 consecutive headers that seem valid *
* Perhaps we can search 2 header with same version or samplefreq(...) to be ****************************************************************************/
* more secure but this seems to be enougth static int CheckPS( input_thread_t *p_input )
*****************************************************************************/
static int MPEGAudio_FindFrame( input_thread_t *p_input,
int *pi_pos,
mpegaudio_format_t *p_mpeg,
int i_posmax )
{ {
byte_t *p_buff; u8 *p_peek;
u32 i_header; int i_size = input_Peek( p_input, &p_peek, 8196 );
int i_framesize;
int i_pos = 0; while( i_size > 4 )
int i_size = input_Peek( p_input, &p_buff, i_posmax+MPEGAUDIO_MAXFRAMESIZE);
while( i_pos <= __MIN( i_posmax, i_size - 4) )
{ {
i_header = __GetDWBE( p_buff ); if( ( p_peek[0] == 0 ) && ( p_peek[1] == 0 )&&
if( MPEGAudio_CheckHeader( i_header ) ) ( p_peek[2] == 1 ) && ( p_peek[3] >= 0xb9 ) )
{ {
MPEGAudio_ParseHeader( i_header, p_mpeg ); return( 1 ); /* it could be ps so ...*/
i_framesize = MPEGAudio_FrameSize( p_mpeg );
if( i_pos + i_framesize + 4 > i_size )
{
*pi_pos = i_pos;
return( 1 );
}
else
{
if( MPEGAudio_CheckHeader( __GetDWBE( p_buff + i_framesize ) ) )
{
*pi_pos = i_pos;
return( 2 );
}
}
} }
p_buff++; p_peek++;
i_pos++; i_size--;
} }
*pi_pos = 0;
return( 0 ); return( 0 );
} }
/*****************************************************************************
* MPEGAudio_ExtractXingHeader : extract a Xing header if exist
*****************************************************************************
* It also calcul avgbitrate, using Xing header if present or assume that
* the bitrate of the first frame is the same for the all file
*****************************************************************************/
static void MPEGAudio_ExtractXingHeader( input_thread_t *p_input,
mpegaudio_xing_header_t *p_xh )
{
int i_pos;
int i_size;
mpegaudio_format_t mpeg;
byte_t *p_buff;
p_xh->i_flags = 0; /* nothing present */
if( !(MPEGAudio_FindFrame( p_input, &i_pos, &mpeg, 2024 )) )
{
return; /* failed , can't */
}
p_xh->i_avgbitrate = mpeg.i_bitrate * 1000; /* default */
/* 1024 is enougth */
if( ( i_size = input_Peek( p_input, &p_buff, 1024 + i_pos ) ) < 8 )
{
return;
}
p_buff += i_pos;
/* calculate pos of xing header */
if( !mpeg.i_version )
{
p_buff += mpeg.i_mode != 3 ? 36 : 21;
}
else
{
p_buff += mpeg.i_mode != 3 ? 21 : 13;
}
if( (*p_buff != 'X' )||(*(p_buff+1) != 'i' )
||(*(p_buff+2) != 'n' )||(*(p_buff+3) != 'g' ) )
{
return;
}
p_buff += 4;
p_xh->i_flags = __GetDWBE( p_buff );
p_buff += 4;
if( p_xh->i_flags&FRAMES_FLAG )
{
p_xh->i_frames = __GetDWBE( p_buff );
p_buff += 4;
}
if( p_xh->i_flags&BYTES_FLAG )
{
p_xh->i_bytes = __GetDWBE( p_buff );
p_buff += 4;
}
if( p_xh->i_flags&TOC_FLAG )
{
p_input->p_vlc->pf_memcpy( p_xh->i_toc, p_buff, 100 );
p_buff += 100;
}
if( p_xh->i_flags&VBR_SCALE_FLAG )
{
p_xh->i_vbr_scale = __GetDWBE( p_buff );
p_buff += 4;
}
if( ( p_xh->i_flags&FRAMES_FLAG )&&( p_xh->i_flags&BYTES_FLAG ) )
{
p_xh->i_avgbitrate =
((u64)p_xh->i_bytes * (u64)8 * (u64)mpeg.i_samplingfreq) /
((u64)p_xh->i_frames * (u64)MPEGAudio_DecodedFrameSize( &mpeg));
}
}
/***************************************************************************** /*****************************************************************************
* Activate: initializes MPEGaudio structures * Activate: initializes MPEGaudio structures
*****************************************************************************/ *****************************************************************************/
static int Activate( vlc_object_t * p_this ) static int Activate( vlc_object_t * p_this )
{ {
input_thread_t * p_input = (input_thread_t *)p_this; input_thread_t * p_input = (input_thread_t *)p_this;
demux_sys_t * p_mpegaudio; demux_sys_t * p_demux;
mpegaudio_format_t mpeg;
es_descriptor_t * p_es;
int i_pos;
int b_forced;
input_info_category_t * p_category; input_info_category_t * p_category;
int i_found;
int b_forced;
int i_skip;
/* Set the demux function */ /* Set the demux function */
p_input->pf_demux = Demux; p_input->pf_demux = Demux;
/* XXX: i don't know what it's supposed to do, copied from ESInit */
/* Initialize access plug-in structures. */ /* Initialize access plug-in structures. */
if( p_input->i_mtu == 0 ) if( p_input->i_mtu == 0 )
{ {
/* Improve speed. */ /* Improve speed. */
p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE; p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
} }
if( ( *p_input->psz_demux ) if( ( *p_input->psz_demux )
&&( !strncmp( p_input->psz_demux, "mpegaudio", 10 ) ) ) &&( ( !strncmp( p_input->psz_demux, "mpegaudio", 10 ) )||
( !strncmp( p_input->psz_demux, "mp3", 3 ) ) ) )
{ {
b_forced = 1; b_forced = 1;
} }
...@@ -448,28 +547,49 @@ static int Activate( vlc_object_t * p_this ) ...@@ -448,28 +547,49 @@ static int Activate( vlc_object_t * p_this )
b_forced = 0; b_forced = 0;
} }
if ( MPEGAudio_SkipID3Tag( p_input ) ) if ( SkipID3Tag( p_input ) )
{ {
return -1; return( -1 );
} }
/* check if it can be a ps stream */ /* create p_demux and init it */
if( __CheckPS( p_input ) && !b_forced ) if( !( p_demux = p_input->p_demux_data = malloc( sizeof(demux_sys_t) ) ) )
{ {
msg_Err( p_input, "out of memory" );
return( -1 ); return( -1 );
} }
memset( p_demux, 0, sizeof(demux_sys_t) );
/* must be sure that is mpeg audio stream */
if( MPEGAudio_FindFrame( p_input, /* check if it could be a ps stream */
&i_pos, if( !b_forced && CheckPS( p_input ))
&mpeg,
(b_forced ? 2 * MPEGAUDIO_MAXFRAMESIZE :
MPEGAUDIO_MAXTESTPOS) )
< (b_forced ? 1 : 2) )
{ {
msg_Warn( p_input, "MPEGAudio module discarded (no frame found)" );
return( -1 ); return( -1 );
} }
/* must be sure that is mpeg audio stream unless forced */
if( !( i_found = GetHeader( p_input,
&p_demux->mpeg,
b_forced ? 4000 : MPEGAUDIO_MAXTESTPOS,
&i_skip ) ) )
{
if( b_forced )
{
msg_Warn( p_input,
"this does not look like an MPEG audio stream, "
"but continuing anyway" );
}
else
{
msg_Warn( p_input, "MPEGAudio module discarded (no frame found)" );
return( -1 );
}
}
else
{
ExtractConfiguration( p_demux );
}
vlc_mutex_lock( &p_input->stream.stream_lock ); vlc_mutex_lock( &p_input->stream.stream_lock );
if( input_InitStream( p_input, 0 ) == -1) if( input_InitStream( p_input, 0 ) == -1)
...@@ -486,79 +606,85 @@ static int Activate( vlc_object_t * p_this ) ...@@ -486,79 +606,85 @@ static int Activate( vlc_object_t * p_this )
p_input->stream.p_selected_program = p_input->stream.pp_programs[0]; p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
/* create our ES */ /* create our ES */
p_es = input_AddES( p_input, p_demux->p_es = input_AddES( p_input,
p_input->stream.p_selected_program, p_input->stream.p_selected_program,
1, /* id */ 1, /* id */
0 ); 0 );
if( !p_es ) if( !p_demux->p_es )
{ {
vlc_mutex_unlock( &p_input->stream.stream_lock ); vlc_mutex_unlock( &p_input->stream.stream_lock );
msg_Err( p_input, "out of memory" ); msg_Err( p_input, "out of memory" );
return( -1 ); return( -1 );
} }
p_es->i_stream_id = 1; p_demux->p_es->i_stream_id = 1;
p_es->i_fourcc = !mpeg.i_layer ? VLC_FOURCC('m','p','g','a') /* layer 1 */ p_demux->p_es->i_fourcc = VLC_FOURCC('m','p','g','a');
: VLC_FOURCC('m','p','g','a'); /* layer 2 */ p_demux->p_es->i_cat = AUDIO_ES;
p_es->i_cat = AUDIO_ES;
input_SelectES( p_input, p_es ); input_SelectES( p_input, p_demux->p_es );
p_input->stream.p_selected_program->b_is_ok = 1; p_input->stream.p_selected_program->b_is_ok = 1;
vlc_mutex_unlock( &p_input->stream.stream_lock ); vlc_mutex_unlock( &p_input->stream.stream_lock );
/* create p_mpegaudio and init it */
p_mpegaudio = p_input->p_demux_data = malloc( sizeof(demux_sys_t) );
if( !p_mpegaudio ) if( i_found )
{ {
msg_Err( p_input, "out of memory" ); /* parse Xing Header if present */
return( -1 ); ExtractXingHeader( p_input, &p_demux->xingheader );
}
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.i_mux_rate = p_demux->xingheader.i_avgbitrate / 50 / 8;
vlc_mutex_unlock( &p_input->stream.stream_lock );
/*input_ClockInit( p_input->stream.p_selected_program );
done by AddProgram */
p_mpegaudio->p_es = p_es;
p_mpegaudio->mpeg = mpeg;
p_mpegaudio->i_framecount = 0;
p_mpegaudio->i_pts = 0;
/* parse Xing Header if present */ /* all is ok :)) */
MPEGAudio_ExtractXingHeader( p_input, &p_mpegaudio->xingheader ); msg_Dbg( p_input, "audio MPEG-%d layer %d %s %dHz %dKb/s %s",
p_demux->mpeg.i_version + 1,
vlc_mutex_lock( &p_input->stream.stream_lock ); p_demux->mpeg.i_layer + 1,
p_input->stream.i_mux_rate = p_mpegaudio->xingheader.i_avgbitrate / 50 / 8; mpegaudio_mode[p_demux->mpeg.i_mode],
vlc_mutex_unlock( &p_input->stream.stream_lock ); p_demux->mpeg.i_samplerate,
p_demux->xingheader.i_avgbitrate / 1000,
p_demux->xingheader.i_flags ?
"VBR (Xing)" : ""
);
vlc_mutex_lock( &p_input->stream.stream_lock );
p_category = input_InfoCategory( p_input, "mpeg" );
input_AddInfo( p_category, "input type", "audio MPEG-%d",
p_demux->mpeg.i_version +1 );
input_AddInfo( p_category, "layer", "%d", p_demux->mpeg.i_layer + 1 );
input_AddInfo( p_category, "mode",
mpegaudio_mode[p_demux->mpeg.i_mode] );
input_AddInfo( p_category, "sample rate", "%dHz",
p_demux->mpeg.i_samplerate );
input_AddInfo( p_category, "average bitrate", "%dKb/s",
p_demux->xingheader.i_avgbitrate / 1000 );
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
else
{
msg_Dbg( p_input,
"assuming audio MPEG, but not frame header yet found" );
vlc_mutex_lock( &p_input->stream.stream_lock );
p_category = input_InfoCategory( p_input, "mpeg" );
input_AddInfo( p_category, "input type", "audio MPEG-?" );
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
#if 0
/* seems now to be ok */
/* FIXME FIXME FIXME FIXME FIXME FIXME FIXME */ /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME */
/* if i don't do that, it don't work correctly but why ??? */ /* if i don't do that, it don't work correctly but why ??? */
/* XXX Sigmund : if you want to seek use this :)
but it work only with file .... ( http doesn't like seeking */
if( p_input->stream.b_seekable ) if( p_input->stream.b_seekable )
{ {
p_input->pf_seek( p_input, 0 ); p_input->pf_seek( p_input, 0 ); // 0 -> seek at position 0
input_AccessReinit( p_input ); input_AccessReinit( p_input );
} }
/* FIXME FIXME FIXME FIXME FIXME FIXME FIXME */ #endif
/* all is ok :)) */
msg_Dbg( p_input, "audio MPEG-%d layer %d %s %dHz %dKb/s %s",
mpeg.i_version + 1,
mpeg.i_layer + 1,
mpegaudio_mode[mpeg.i_mode],
mpeg.i_samplingfreq,
p_mpegaudio->xingheader.i_avgbitrate / 1000,
p_mpegaudio->xingheader.i_flags ?
"VBR (Xing)" : ""
);
vlc_mutex_lock( &p_input->stream.stream_lock );
p_category = input_InfoCategory( p_input, "mpeg" );
input_AddInfo( p_category, "input type", "audio MPEG-%d",
mpeg.i_version +1 );
input_AddInfo( p_category, "layer", "%d", mpeg.i_layer + 1 );
input_AddInfo( p_category, "mode", mpegaudio_mode[mpeg.i_mode] );
input_AddInfo( p_category, "sample rate", "%dHz", mpeg.i_samplingfreq );
input_AddInfo( p_category, "average bitrate", "%dKb/s",
p_mpegaudio->xingheader.i_avgbitrate / 1000 );
vlc_mutex_unlock( &p_input->stream.stream_lock );
return( 0 ); return( 0 );
} }
...@@ -569,78 +695,56 @@ static int Activate( vlc_object_t * p_this ) ...@@ -569,78 +695,56 @@ static int Activate( vlc_object_t * p_this )
*****************************************************************************/ *****************************************************************************/
static int Demux( input_thread_t * p_input ) static int Demux( input_thread_t * p_input )
{ {
int i_pos; demux_sys_t *p_demux = p_input->p_demux_data;
int i_toread; pes_packet_t *p_pes;
pes_packet_t *p_pes; int i_skip;
mpegaudio_format_t mpeg;
demux_sys_t *p_mpegaudio = p_input->p_demux_data;
/* look for a frame */
if( !MPEGAudio_FindFrame( p_input, &i_pos, &mpeg, 4096 ) )
{
msg_Warn( p_input, "cannot find next frame" );
return( 0 );
}
/* if stream has changed */ if( !GetHeader( p_input,
if( ( mpeg.i_version != p_mpegaudio->mpeg.i_version ) &p_demux->mpeg,
||( mpeg.i_layer != p_mpegaudio->mpeg.i_layer ) 8192,
||( mpeg.i_samplingfreq != p_mpegaudio->mpeg.i_samplingfreq ) ) &i_skip ) )
{
msg_Dbg( p_input, "stream has changed" );
p_mpegaudio->i_framecount = 0;
p_mpegaudio->i_pts = 0;
}
input_ClockManageRef( p_input,
p_input->stream.p_selected_program,
p_mpegaudio->i_pts );
/* in fact i_pos may be garbage but ... i don't want to skip it
it's borring ;) */
i_toread = MPEGAudio_FrameSize( &mpeg ) + i_pos;
/* create one pes */
if( !(p_pes = input_NewPES( p_input->p_method_data )) )
{ {
msg_Err( p_input, "cannot allocate new PES" ); if( i_skip > 0)
return( -1 );
}
while( i_toread > 0 )
{
data_packet_t *p_data;
int i_read;
if( (i_read = input_SplitBuffer( p_input, &p_data, i_toread ) ) <= 0 )
{ {
break; msg_Dbg( p_input,
} "skipping %d bytes (garbage ?)",
if( !p_pes->p_first ) i_skip );
{ SkipBytes( p_input, i_skip );
p_pes->p_first = p_data; return( 1 );
p_pes->i_nb_data = 1;
p_pes->i_pes_size = i_read;
} }
else else
{ {
p_pes->p_last->p_next = p_data; msg_Dbg( p_input,
p_pes->i_nb_data++; "cannot find next frame (EOF ?)" );
p_pes->i_pes_size += i_read; return( 0 );
} }
p_pes->p_last = p_data;
i_toread -= i_read;
} }
p_mpegaudio->i_pts = (mtime_t)90000 *
(mtime_t)p_mpegaudio->i_framecount *
(mtime_t)MPEGAudio_DecodedFrameSize( &mpeg ) /
(mtime_t)mpeg.i_samplingfreq;
p_pes->i_dts = 0;
p_pes->i_pts = input_ClockGetTS( p_input,
p_input->stream.p_selected_program,
p_mpegaudio->i_pts );
if( !p_mpegaudio->p_es->p_decoder_fifo ) ExtractConfiguration( p_demux );
input_ClockManageRef( p_input,
p_input->stream.p_selected_program,
p_demux->i_pts );
/*
* For layer 1 and 2 i_skip is garbage but for layer 3 it is not.
* Since mad accept without to much trouble garbage I don't skip
* it ( in case I misdetect garbage ... )
*
*/
if( !ReadPES( p_input, &p_pes, p_demux->i_framelength + i_skip) )
{
msg_Err( p_input,
"cannot read data" );
return( -1 );
}
p_pes->i_dts =
p_pes->i_pts = input_ClockGetTS( p_input,
p_input->stream.p_selected_program,
p_demux->i_pts );
if( !p_demux->p_es->p_decoder_fifo )
{ {
msg_Err( p_input, "no audio decoder" ); msg_Err( p_input, "no audio decoder" );
input_DeletePES( p_input->p_method_data, p_pes ); input_DeletePES( p_input->p_method_data, p_pes );
...@@ -648,13 +752,13 @@ static int Demux( input_thread_t * p_input ) ...@@ -648,13 +752,13 @@ static int Demux( input_thread_t * p_input )
} }
else else
{ {
input_DecodePES( p_mpegaudio->p_es->p_decoder_fifo, p_pes ); input_DecodePES( p_demux->p_es->p_decoder_fifo, p_pes );
} }
p_demux->i_pts += (mtime_t)90000 *
p_mpegaudio->i_framecount++; (mtime_t)p_demux->i_samplelength /
p_mpegaudio->mpeg = mpeg; (mtime_t)p_demux->i_samplerate;
return( 1 ); return( 1 );
} }
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment