/*****************************************************************************
* mpga.c : MPEG-I/II Audio input module for vlc
*****************************************************************************
- * Copyright (C) 2001-2004 VideoLAN
+ * Copyright (C) 2001-2004 the VideoLAN team
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ * Gildas Bazin <gbazin@videolan.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
#include <stdlib.h> /* malloc(), free() */
#include <vlc/vlc.h>
-#include <vlc/input.h>
+#include <vlc_demux.h>
+#include <vlc_codec.h>
+#include <vlc_meta.h>
-#include "vlc_meta.h"
+#define MPGA_PACKET_SIZE 1024
/*****************************************************************************
* Module descriptor
static void Close( vlc_object_t * );
vlc_module_begin();
- set_description( _("MPEG-I/II audio demuxer" ) );
+ set_category( CAT_INPUT );
+ set_subcategory( SUBCAT_INPUT_DEMUX );
+ set_description( _("MPEG audio / MP3 demuxer" ) );
set_capability( "demux2", 100 );
set_callbacks( Open, Close );
add_shortcut( "mpga" );
add_shortcut( "mp3" );
vlc_module_end();
-/* TODO:
- * - free bitrate
- */
-
/*****************************************************************************
* Local prototypes
*****************************************************************************/
struct demux_sys_t
{
- date_t pts;
- mtime_t i_time_offset;
+ es_out_id_t *p_es;
+ vlc_meta_t *meta;
+
+ vlc_bool_t b_start;
+ decoder_t *p_packetizer;
- int i_bitrate_avg; /* extracted from Xing header */
+ mtime_t i_pts;
+ mtime_t i_time_offset;
+ int i_bitrate_avg; /* extracted from Xing header */
- vlc_meta_t *meta;
+ vlc_bool_t b_initial_sync_failed;
- es_out_id_t *p_es;
+ int i_xing_frames;
+ int i_xing_bytes;
+ int i_xing_bitrate_avg;
+ int i_xing_frame_samples;
+ block_t *p_block_in, *p_block_out;
};
static int HeaderCheck( uint32_t h )
|| (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
|| ((h & 0x03) == 0x02 )) /* valid emphasis ? */
{
- return( VLC_FALSE );
+ return VLC_FALSE;
}
- return( VLC_TRUE );
+ return VLC_TRUE;
}
-static int mpga_sample_rate[2][4] =
-{
- { 44100, 48000, 32000, 0 },
- { 22050, 24000, 16000, 0 }
-};
-
-static int mpga_bitrate[2][3][16] =
-{
- {
- { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0},
- { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0},
- { 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},
- { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0},
- { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}
- }
-};
-
-
#define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
#define MPGA_LAYER( h ) ( 3 - (((h)>>17)&0x03) )
-#define MPGA_SAMPLE_RATE(h) \
- ( mpga_sample_rate[MPGA_VERSION(h)][((h)>>10)&0x03] / ( ((h>>20)&0x01) ? 1 : 2) )
-#define MPGA_CHANNELS(h) ( (((h)>>6)&0x03) == 3 ? 1 : 2)
-#define MPGA_BITRATE(h) mpga_bitrate[MPGA_VERSION(h)][MPGA_LAYER(h)][((h)>>12)&0x0f]
-#define MPGA_PADDING(h) ( ((h)>>9)&0x01 )
#define MPGA_MODE(h) (((h)>> 6)&0x03)
-static int mpga_frame_size( uint32_t h )
-{
- switch( MPGA_LAYER(h) )
- {
- case 0:
- return ( ( 12000 * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h) ) * 4;
- case 1:
- return ( 144000 * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h);
- case 2:
- return ( ( MPGA_VERSION(h) ? 72000 : 144000 ) * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h);
- default:
- return 0;
- }
-}
-
static int mpga_frame_samples( uint32_t h )
{
switch( MPGA_LAYER(h) )
}
}
+
/*****************************************************************************
* Open: initializes demux structures
*****************************************************************************/
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
vlc_bool_t b_forced = VLC_FALSE;
- vlc_bool_t b_extention = VLC_FALSE;
uint32_t header;
uint8_t *p_peek;
module_t *p_id3;
- es_format_t fmt;
+ block_t *p_block_in, *p_block_out;
- if( !strncmp( p_demux->psz_demux, "mpga", 4 ) ||
- !strncmp( p_demux->psz_demux, "mp3", 3 ) )
- {
- b_forced = VLC_TRUE;
- }
if( p_demux->psz_path )
{
int i_len = strlen( p_demux->psz_path );
if( i_len > 4 && !strcasecmp( &p_demux->psz_path[i_len - 4], ".mp3" ) )
{
- b_extention = VLC_TRUE;
+ b_forced = VLC_TRUE;
}
}
- p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
- p_sys->i_time_offset = 0;
- p_sys->i_bitrate_avg = 0;
- p_sys->meta = NULL;
-
- /* skip/parse possible id3 header */
- if( ( p_id3 = module_Need( p_demux, "id3", NULL, 0 ) ) )
- {
- p_sys->meta = (vlc_meta_t *)p_demux->p_private;
- p_demux->p_private = NULL;
-
- module_Unneed( p_demux, p_id3 );
- }
-
- if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
- {
- msg_Err( p_demux, "cannot peek" );
- Close( VLC_OBJECT(p_demux ) );
- return VLC_EGENERIC;
- }
+ if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
if( !HeaderCheck( header = GetDWBE( p_peek ) ) )
{
vlc_bool_t b_ok = VLC_FALSE;
int i_peek;
- if( !b_forced && !b_extention )
- {
- msg_Warn( p_demux, "mpga module discarded" );
- Close( VLC_OBJECT(p_demux) );
- return VLC_EGENERIC;
- }
+ if( !p_demux->b_force && !b_forced ) return VLC_EGENERIC;
i_peek = stream_Peek( p_demux->s, &p_peek, 8096 );
-
while( i_peek > 4 )
{
if( HeaderCheck( header = GetDWBE( p_peek ) ) )
b_ok = VLC_TRUE;
break;
}
- p_peek += 4;
- i_peek -= 4;
- }
- if( !b_ok && !b_forced )
- {
- msg_Warn( p_demux, "mpga module discarded" );
- Close( VLC_OBJECT(p_demux) );
- return VLC_EGENERIC;
+ p_peek += 1;
+ i_peek -= 1;
}
+ if( !b_ok && !p_demux->b_force ) return VLC_EGENERIC;
}
- p_demux->pf_demux = Demux;
- p_demux->pf_control = Control;
+ STANDARD_DEMUX_INIT; p_sys = p_demux->p_sys;
+ memset( p_sys, 0, sizeof( demux_sys_t ) );
+ p_sys->p_es = 0;
+ p_sys->b_start = VLC_TRUE;
+ p_sys->meta = 0;
- es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', 'g', 'a' ) );
+ /* Load the mpeg audio packetizer */
+ INIT_APACKETIZER( p_sys->p_packetizer, 'm', 'p', 'g', 'a' );
+ es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );
+ LOAD_PACKETIZER_OR_FAIL( p_sys->p_packetizer, "mpga" );
+ /* Xing header */
if( HeaderCheck( header ) )
{
- int i_xing;
+ int i_xing, i_skip;
uint8_t *p_xing;
- char psz_description[50];
- p_sys->i_bitrate_avg = MPGA_BITRATE( header ) * 1000;
- if( ( i_xing = stream_Peek( p_demux->s, &p_xing, 1024 ) ) >= 21 )
+ if( ( i_xing = stream_Peek( p_demux->s, &p_xing, 1024 ) ) < 21 )
+ return VLC_SUCCESS; /* No header */
+
+ if( MPGA_VERSION( header ) == 0 )
+ {
+ i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
+ }
+ else
+ {
+ i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
+ }
+
+ if( i_skip + 8 < i_xing && !strncmp( (char *)&p_xing[i_skip], "Xing", 4 ) )
{
- int i_skip;
+ unsigned int i_flags = GetDWBE( &p_xing[i_skip+4] );
- if( MPGA_VERSION( header) == 0 )
+ p_xing += i_skip + 8;
+ i_xing -= i_skip + 8;
+
+ i_skip = 0;
+ if( i_flags&0x01 && i_skip + 4 <= i_xing ) /* XING_FRAMES */
+ {
+ p_sys->i_xing_frames = GetDWBE( &p_xing[i_skip] );
+ i_skip += 4;
+ }
+ if( i_flags&0x02 && i_skip + 4 <= i_xing ) /* XING_BYTES */
{
- i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
+ p_sys->i_xing_bytes = GetDWBE( &p_xing[i_skip] );
+ i_skip += 4;
}
- else
+ if( i_flags&0x04 ) /* XING_TOC */
{
- i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
+ i_skip += 100;
}
- if( i_skip + 8 < i_xing &&
- !strncmp( &p_xing[i_skip], "Xing", 4 ) )
+
+ // FIXME: doesn't return the right bitrage average, at least
+ // with some MP3's
+ if( i_flags&0x08 && i_skip + 4 <= i_xing ) /* XING_VBR */
{
- unsigned int i_flags = GetDWBE( &p_xing[i_skip+4] );
- unsigned int i_bytes = 0, i_frames = 0;
-
- p_xing += i_skip + 8;
- i_xing -= i_skip + 8;
-
- i_skip = 0;
- if( i_flags&0x01 && i_skip + 4 <= i_xing ) /* XING_FRAMES */
- {
- i_frames = GetDWBE( &p_xing[i_skip] );
- i_skip += 4;
- }
- if( i_flags&0x02 && i_skip + 4 <= i_xing ) /* XING_BYTES */
- {
- i_bytes = GetDWBE( &p_xing[i_skip] );
- i_skip += 4;
- }
- if( i_flags&0x04 ) /* XING_TOC */
- {
- i_skip += 100;
- }
-#if 0
-// FIXME: doesn't return the right bitrage average, at least with some MP3's
- if( i_flags&0x08 && i_skip + 4 <= i_xing ) /* XING_VBR */
- {
- p_sys->i_bitrate_avg = GetDWBE( &p_xing[i_skip] );
- fprintf(stderr,"rate2 %d\n", p_sys->i_bitrate_avg);
- msg_Dbg( p_input, "xing vbr value present (%d)", p_sys->i_bitrate_avg );
- }
- else
-#endif
- if( i_frames > 0 && i_bytes > 0 )
- {
- p_sys->i_bitrate_avg = (int64_t)i_bytes *
- (int64_t)8 *
- (int64_t)MPGA_SAMPLE_RATE( header ) /
- (int64_t)i_frames /
- (int64_t)mpga_frame_samples( header );
- msg_Dbg( p_demux, "xing frames&bytes value present (%db/s)", p_sys->i_bitrate_avg );
- }
+ p_sys->i_xing_bitrate_avg = GetDWBE( &p_xing[i_skip] );
+ msg_Dbg( p_demux, "xing vbr value present (%d)",
+ p_sys->i_xing_bitrate_avg );
+ }
+
+ if( p_sys->i_xing_frames > 0 && p_sys->i_xing_bytes > 0 )
+ {
+ p_sys->i_xing_frame_samples = mpga_frame_samples( header );
+ msg_Dbg( p_demux, "xing frames&bytes value present "
+ "(%d bytes, %d frames, %d samples/frame)",
+ p_sys->i_xing_bytes, p_sys->i_xing_frames,
+ p_sys->i_xing_frame_samples );
}
}
+ }
- msg_Dbg( p_demux, "version=%d layer=%d channels=%d samplerate=%d",
- MPGA_VERSION( header ) + 1,
- MPGA_LAYER( header ) + 1,
- MPGA_CHANNELS( header ),
- MPGA_SAMPLE_RATE( header ) );
-
- fmt.audio.i_channels = MPGA_CHANNELS( header );
- fmt.audio.i_rate = MPGA_SAMPLE_RATE( header );
- fmt.i_bitrate = p_sys->i_bitrate_avg;
- sprintf( psz_description, "MPEG Audio Layer %d, version %d",
- MPGA_LAYER ( header ) + 1, MPGA_VERSION ( header ) + 1 );
- fmt.psz_description = strdup( psz_description );
-
- date_Init( &p_sys->pts, fmt.audio.i_rate, 1 );
- date_Set( &p_sys->pts, 1 );
+ if( ( p_block_in = stream_Block( p_demux->s, MPGA_PACKET_SIZE ) ) == NULL )
+ {
+ return VLC_EGENERIC;
+ }
+ p_block_in->i_pts = p_block_in->i_dts = 1;
+ p_block_out = p_sys->p_packetizer->pf_packetize(
+ p_sys->p_packetizer, &p_block_in );
+
+ if( p_block_out == NULL )
+ {
+ msg_Dbg( p_demux, "did not sync on first block" );
+ p_sys->b_initial_sync_failed = VLC_TRUE;
}
+ else
+ p_sys->b_initial_sync_failed = VLC_FALSE;
- p_sys->p_es = es_out_Add( p_demux->out, &fmt );
- if( fmt.psz_description ) free( fmt.psz_description );
+ p_sys->p_packetizer->fmt_out.b_packetized = VLC_TRUE;
+ p_sys->p_es = es_out_Add( p_demux->out,
+ &p_sys->p_packetizer->fmt_out);
+ p_sys->i_bitrate_avg = p_sys->p_packetizer->fmt_out.i_bitrate;
+
+ if( p_sys->i_xing_bytes && p_sys->i_xing_frames &&
+ p_sys->i_xing_frame_samples )
+ {
+ p_sys->i_bitrate_avg = p_sys->i_xing_bytes * I64C(8) *
+ p_sys->p_packetizer->fmt_out.audio.i_rate /
+ p_sys->i_xing_frames / p_sys->i_xing_frame_samples;
+ }
+
+ p_sys->p_block_in = p_block_in;
+ p_sys->p_block_out = p_block_out;
+
+ /* Parse possible id3 header */
+ if( ( p_id3 = module_Need( p_demux, "meta reader", NULL, 0 ) ) )
+ {
+ p_sys->meta = (vlc_meta_t *)p_demux->p_private;
+ p_demux->p_private = NULL;
+ module_Unneed( p_demux, p_id3 );
+ }
return VLC_SUCCESS;
}
-
/*****************************************************************************
* Demux: reads and demuxes data packets
*****************************************************************************
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
- block_t *p_frame;
-
- uint32_t header;
- uint8_t *p_peek;
-
- if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
+ block_t *p_block_in, *p_block_out;
+ if( p_sys->b_start )
{
- msg_Warn( p_demux, "cannot peek" );
- return 0;
+ p_sys->b_start = VLC_FALSE;
+ p_block_in = p_sys->p_block_in;
+ p_sys->p_block_in = NULL;
+ p_block_out = p_sys->p_block_out;
+ p_sys->p_block_out = NULL;
}
-
- if( !HeaderCheck( header = GetDWBE( p_peek ) ) )
+ else
{
- /* we need to resynch */
- vlc_bool_t b_ok = VLC_FALSE;
- int i_skip = 0;
- int i_peek;
-
- i_peek = stream_Peek( p_demux->s, &p_peek, 8096 );
- if( i_peek < 4 )
+ if( ( p_block_in = stream_Block( p_demux->s, MPGA_PACKET_SIZE ) )
+ == NULL )
{
- msg_Warn( p_demux, "cannot peek" );
return 0;
}
-
- while( i_peek >= 4 )
+ if( p_demux->p_sys->b_initial_sync_failed == VLC_TRUE )
{
- if( HeaderCheck( header = GetDWBE( p_peek ) ) )
- {
- b_ok = VLC_TRUE;
- break;
- }
-
- p_peek++;
- i_peek--;
- i_skip++;
+ p_block_in->i_pts = p_block_in->i_dts = 1;
+ /* Only try to resync once */
+ p_demux->p_sys->b_initial_sync_failed = 0;
}
-
- msg_Warn( p_demux, "garbage=%d bytes", i_skip );
- stream_Read( p_demux->s, NULL, i_skip );
- return 1;
+ else
+ p_block_in->i_pts = p_block_in->i_dts = 0;
+ p_block_out = p_sys->p_packetizer->pf_packetize(
+ p_sys->p_packetizer, &p_block_in );
}
- if( ( p_frame = stream_Block( p_demux->s,
- mpga_frame_size( header ) ) ) == NULL )
- {
- msg_Warn( p_demux, "cannot read data" );
- return 0;
- }
- p_frame->i_dts = p_frame->i_pts =
- date_Increment( &p_sys->pts, mpga_frame_samples( header ) );
+ while( p_block_out )
+ {
+ while( p_block_out )
+ {
+ block_t *p_next = p_block_out->p_next;
- /* set PCR */
- es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_frame->i_pts );
+ es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
- es_out_Send( p_demux->out, p_sys->p_es, p_frame );
+ p_block_out->p_next = NULL;
+ p_sys->i_pts = p_block_out->i_pts;
+ es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
+ p_block_out = p_next;
+ }
+ p_block_out = p_sys->p_packetizer->pf_packetize(
+ p_sys->p_packetizer, &p_block_in );
+ }
return 1;
}
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys = p_demux->p_sys;
- if( p_sys->meta )
- {
- vlc_meta_Delete( p_sys->meta );
- }
+
+ DESTROY_PACKETIZER( p_sys->p_packetizer );
+ if( p_sys->meta ) vlc_meta_Delete( p_sys->meta );
+ if( p_sys->p_block_out ) block_Release( p_sys->p_block_out );
free( p_sys );
}
{
demux_sys_t *p_sys = p_demux->p_sys;
int64_t *pi64;
- vlc_meta_t **pp_meta;
+ vlc_meta_t *p_meta;
int i_ret;
switch( i_query )
{
case DEMUX_GET_META:
- pp_meta = (vlc_meta_t **)va_arg( args, vlc_meta_t** );
- if( p_sys->meta )
- {
- *pp_meta = vlc_meta_Duplicate( p_sys->meta );
- }
- else
- {
- *pp_meta = NULL;
- }
+ p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t* );
+ vlc_meta_Merge( p_meta, p_sys->meta );
return VLC_SUCCESS;
case DEMUX_GET_TIME:
pi64 = (int64_t*)va_arg( args, int64_t * );
- *pi64 = date_Get( &p_sys->pts ) + p_sys->i_time_offset;
+ *pi64 = p_sys->i_pts + p_sys->i_time_offset;
return VLC_SUCCESS;
case DEMUX_SET_TIME:
/* FIXME TODO: implement a high precision seek (with mp3 parsing)
* needed for multi-input */
+
default:
i_ret = demux2_vaControlHelper( p_demux->s, 0, -1,
p_sys->i_bitrate_avg, 1, i_query,
args );
+ /* No bitrate, we can't have it precisely, but we can compute
+ * a raw approximation with time/position */
+ if( i_ret && i_query == DEMUX_GET_LENGTH &&!p_sys->i_bitrate_avg )
+ {
+ float f_pos = (double)( stream_Tell( p_demux->s ) ) /
+ (double)( stream_Size( p_demux->s ) );
+ /* The first few seconds are guaranteed to be very whacky,
+ * don't bother trying ... Too bad */
+ if( f_pos < 0.01 ||
+ (p_sys->i_pts + p_sys->i_time_offset) < 8000000 )
+ return VLC_EGENERIC;
+
+ pi64 = (int64_t *)va_arg( args, int64_t * );
+ *pi64 = (p_sys->i_pts + p_sys->i_time_offset) / f_pos;
+ return VLC_SUCCESS;
+ }
if( !i_ret && p_sys->i_bitrate_avg > 0 &&
(i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME) )
{
int64_t i_time = I64C(8000000) * stream_Tell(p_demux->s) /
p_sys->i_bitrate_avg;
- /* fix time_offset */
- if( i_time >= 0 )
- p_sys->i_time_offset = i_time - date_Get( &p_sys->pts );
+ /* Fix time_offset */
+ if( i_time >= 0 ) p_sys->i_time_offset = i_time - p_sys->i_pts;
}
return i_ret;
}
projects / vlc / blobdiff