/*****************************************************************************
- * a52sys.c : A/52 input module for vlc
+ * a52.c : Raw a52 Stream input module for vlc
*****************************************************************************
* Copyright (C) 2001 VideoLAN
- * $Id: a52sys.c,v 1.3 2003/05/05 22:23:34 gbazin Exp $
+ * $Id: a52sys.c,v 1.4 2003/08/01 00:04:28 fenrir Exp $
*
- * Authors: Arnaud de Bossoreille de Ribou <bozo@via.ecp.fr>
+ * Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* 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
* the Free Software Foundation; either version 2 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
* Preamble
*****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
-#include <string.h> /* strdup() */
-#include <errno.h>
#include <vlc/vlc.h>
#include <vlc/input.h>
-#include <sys/types.h>
+#include <ninput.h>
/*****************************************************************************
- * Constants
+ * Module descriptor
*****************************************************************************/
-#define A52_PACKET_SIZE 16384
-#define MAX_PACKETS_IN_FIFO 3
+static int Open ( vlc_object_t * );
+static void Close ( vlc_object_t * );
+
+vlc_module_begin();
+ set_description( _("A52 demuxer" ) );
+ set_capability( "demux", 100 );
+ set_callbacks( Open, Close );
+ add_shortcut( "a52" );
+vlc_module_end();
+
+/* TODO:
+ *
+ */
/*****************************************************************************
* Local prototypes
*****************************************************************************/
-static int Init ( vlc_object_t * );
-static int Demux ( input_thread_t * );
+static int Demux ( input_thread_t * );
-/*****************************************************************************
- * Module descriptor
- *****************************************************************************/
-vlc_module_begin();
- set_description( _("A52 demuxer") );
- set_capability( "demux", 155 );
- set_callbacks( Init, NULL );
- add_shortcut( "a52" );
-vlc_module_end();
+struct demux_sys_t
+{
+ stream_t *s;
+ mtime_t i_time;
+
+ es_descriptor_t *p_es;
+};
+
+static inline int HeaderCheck( const uint8_t * p )
+{
+ if( (p[0] != 0x0b) || (p[1] != 0x77) || /* syncword */
+ (p[5] >= 0x60) || /* bsid >= 12 */
+ (p[4] & 63) >= 38 || /* frmsizecod */
+ ( (p[4] & 0xc0) != 0 && (p[4] & 0xc0) != 0x40 && (p[4] & 0xc0) != 0x80 ) )
+ {
+ return VLC_FALSE;
+ }
+ return VLC_TRUE;
+}
+
+static int HeaderInfo( const uint8_t * p,
+ int *pi_channels,
+ int *pi_sample_rate,
+ int *pi_frame_size );
/*****************************************************************************
- * Init: initializes ES structures
+ * Open: initializes AAC demux structures
*****************************************************************************/
-static int Init( vlc_object_t * p_this )
+static int Open( vlc_object_t * p_this )
{
- input_thread_t * p_input = (input_thread_t *)p_this;
- es_descriptor_t * p_es;
- byte_t * p_peek;
+ input_thread_t *p_input = (input_thread_t *)p_this;
+ demux_sys_t *p_sys;
+ int b_forced = VLC_FALSE;
+
+ uint8_t *p_peek;
- /* Initialize access plug-in structures. */
- if( p_input->i_mtu == 0 )
+ module_t *p_id3;
+
+
+ if( p_input->psz_demux && !strncmp( p_input->psz_demux, "a52", 3 ) )
{
- /* Improve speed. */
- p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
+ b_forced = VLC_TRUE;
}
+ if( p_input->psz_name )
+ {
+ int i_len = strlen( p_input->psz_name );
- p_input->pf_demux = Demux;
- p_input->pf_rewind = NULL;
+ if( i_len > 4 && !strcasecmp( &p_input->psz_name[i_len - 4], ".a52" ) )
+ {
+ b_forced = VLC_TRUE;
+ }
+ }
- /* Have a peep at the show. */
- if( input_Peek( p_input, &p_peek, 2 ) < 2 )
+ /* skip possible id3 header */
+ p_id3 = module_Need( p_input, "id3", NULL );
+ if ( p_id3 )
{
- /* Stream shorter than 4 bytes... */
- msg_Err( p_input, "cannot peek()" );
- return( -1 );
+ module_Unneed( p_input, p_id3 );
}
- if( *p_peek != 0x0b || *(p_peek + 1) != 0x77 )
+ /* see if it could be 52 */
+ if( !b_forced )
{
- if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "a52", 3 ) )
+ if( input_Peek( p_input, &p_peek, 6 ) < 6 )
{
- /* User forced */
- msg_Err( p_input, "this doesn't look like an a52 stream, continuing" );
+ msg_Err( p_input, "cannot peek" );
+ return VLC_EGENERIC;
}
- else
+ if( !HeaderCheck( p_peek ) )
{
- msg_Warn( p_input, "a52 module discarded (no startcode)" );
- return( -1 );
+ msg_Warn( p_input, "A52 module discarded" );
+ return VLC_EGENERIC;
}
}
- if( input_InitStream( p_input, 0 ) == -1 )
+ p_input->pf_demux = Demux;
+
+ p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
+ p_sys->i_time = 0;
+
+ if( ( p_sys->s = stream_OpenInput( p_input ) ) == NULL )
{
- return( -1 );
+ msg_Err( p_input, "cannot create stream" );
+ goto error;
}
- input_AddProgram( p_input, 0, 0 );
- p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
+
+ if( stream_Peek( p_sys->s, &p_peek, 6 ) < 6 )
+ {
+ msg_Err( p_input, "cannot peek" );
+ goto error;
+ }
+
+ if( HeaderCheck( p_peek ) )
+ {
+ int i_channels, i_sample_rate, i_frame_size;
+ input_info_category_t * p_category;
+
+ HeaderInfo( p_peek, &i_channels, &i_sample_rate, &i_frame_size );
+
+ msg_Dbg( p_input,
+ "a52 channels=%d sample_rate=%d",
+ i_channels, i_sample_rate );
+
+ vlc_mutex_lock( &p_input->stream.stream_lock );
+
+ p_category = input_InfoCategory( p_input, _("A52") );
+
+ input_AddInfo( p_category, _("Input Type"), "A52" );
+ input_AddInfo( p_category, _("Channels"), "%d", i_channels );
+ input_AddInfo( p_category, _("Sample Rate"), "%dHz", i_sample_rate );
+
+ vlc_mutex_unlock( &p_input->stream.stream_lock );
+ }
+
vlc_mutex_lock( &p_input->stream.stream_lock );
- p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xBD,
- AUDIO_ES, NULL, 0 );
- p_es->i_stream_id = 0xBD;
- p_es->i_fourcc = VLC_FOURCC('a','5','2',' ');
- input_SelectES( p_input, p_es );
- p_input->stream.p_selected_area->i_tell = 0;
+ if( input_InitStream( p_input, 0 ) == -1)
+ {
+ vlc_mutex_unlock( &p_input->stream.stream_lock );
+ msg_Err( p_input, "cannot init stream" );
+ goto error;
+ }
+ if( input_AddProgram( p_input, 0, 0) == NULL )
+ {
+ vlc_mutex_unlock( &p_input->stream.stream_lock );
+ msg_Err( p_input, "cannot add program" );
+ goto error;
+ }
+ p_input->stream.pp_programs[0]->b_is_ok = 0;
+ p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
+
+ p_input->stream.i_mux_rate = 0 / 50;
+
+ p_sys->p_es = input_AddES( p_input,
+ p_input->stream.p_selected_program,
+ 1 , AUDIO_ES, NULL, 0 );
+
+ p_sys->p_es->i_stream_id = 1;
+ p_sys->p_es->i_fourcc = VLC_FOURCC( 'a', '5', '2', ' ' );
+ input_SelectES( p_input, p_sys->p_es );
+
p_input->stream.p_selected_program->b_is_ok = 1;
vlc_mutex_unlock( &p_input->stream.stream_lock );
- return( 0 );
+ return VLC_SUCCESS;
+
+error:
+ if( p_sys->s )
+ {
+ stream_Release( p_sys->s );
+ }
+ free( p_sys );
+ return VLC_EGENERIC;
}
+
/*****************************************************************************
* Demux: reads and demuxes data packets
*****************************************************************************
*****************************************************************************/
static int Demux( input_thread_t * p_input )
{
- ssize_t i_read;
- decoder_fifo_t * p_fifo =
- p_input->stream.p_selected_program->pp_es[0]->p_decoder_fifo;
- pes_packet_t * p_pes;
- data_packet_t * p_data;
+ demux_sys_t *p_sys = p_input->p_demux_data;
+ pes_packet_t *p_pes;
- if( p_fifo == NULL )
+ int i_channels, i_sample_rate, i_frame_size;
+
+ uint8_t *p_peek;
+
+ if( stream_Peek( p_sys->s, &p_peek, 6 ) < 6 )
{
- return -1;
+ msg_Warn( p_input, "cannot peek" );
+ return 0;
}
- i_read = input_SplitBuffer( p_input, &p_data, A52_PACKET_SIZE );
+ if( !HeaderCheck( p_peek ) )
+ {
+ /* we need to resynch */
+ vlc_bool_t b_ok = VLC_FALSE;
+ int i_skip = 0;
+ int i_peek;
+
+ i_peek = stream_Peek( p_sys->s, &p_peek, 8096 );
+ if( i_peek < 8 )
+ {
+ msg_Warn( p_input, "cannot peek" );
+ return 0;
+ }
+
+ while( i_peek >= 8 )
+ {
+ if( HeaderCheck( p_peek ) )
+ {
+ b_ok = VLC_TRUE;
+ break;
+ }
+
+ p_peek++;
+ i_peek--;
+ i_skip++;
+ }
+
+ msg_Warn( p_input, "garbage=%d bytes", i_skip );
+ stream_Read( p_sys->s, NULL, i_skip );
+ return 1;
+ }
- if ( i_read <= 0 )
+ HeaderInfo( p_peek, &i_channels, &i_sample_rate, &i_frame_size );
+
+ input_ClockManageRef( p_input,
+ p_input->stream.p_selected_program,
+ p_sys->i_time * 9 / 100 );
+
+ if( ( p_pes = stream_PesPacket( p_sys->s, i_frame_size ) ) == NULL )
{
- return i_read;
+ msg_Warn( p_input, "cannot read data" );
+ return 0;
}
- p_pes = input_NewPES( p_input->p_method_data );
+ p_pes->i_dts =
+ p_pes->i_pts = input_ClockGetTS( p_input,
+ p_input->stream.p_selected_program,
+ p_sys->i_time * 9 / 100 );
- if( p_pes == NULL )
+ if( !p_sys->p_es->p_decoder_fifo )
{
- msg_Err( p_input, "out of memory" );
- input_DeletePacket( p_input->p_method_data, p_data );
+ msg_Err( p_input, "no audio decoder" );
+ input_DeletePES( p_input->p_method_data, p_pes );
return( -1 );
}
- p_pes->i_rate = p_input->stream.control.i_rate;
- p_pes->p_first = p_pes->p_last = p_data;
- p_pes->i_nb_data = 1;
+ input_DecodePES( p_sys->p_es->p_decoder_fifo, p_pes );
+ p_sys->i_time += (mtime_t)1000000 *
+ (mtime_t)1536 /
+ (mtime_t)i_sample_rate;
+ return( 1 );
+}
+
+/*****************************************************************************
+ * Close: frees unused data
+ *****************************************************************************/
+static void Close( vlc_object_t * p_this )
+{
+ input_thread_t *p_input = (input_thread_t*)p_this;
+ demux_sys_t *p_sys = p_input->p_demux_data;
- vlc_mutex_lock( &p_fifo->data_lock );
- if( p_fifo->i_depth >= MAX_PACKETS_IN_FIFO )
+ if( p_sys->s )
{
- /* Wait for the decoder. */
- vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
+ stream_Release( p_sys->s );
}
- vlc_mutex_unlock( &p_fifo->data_lock );
+ free( p_sys );
+}
+
- if( (p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT)
- |(p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_START)
- | (input_ClockManageControl( p_input,
- p_input->stream.p_selected_program,
- (mtime_t)0 ) == PAUSE_S) )
+
+/*****************************************************************************
+ * SyncInfo: parse A/52 sync info
+ *****************************************************************************
+ * This code is borrowed from liba52 by Aaron Holtzman & Michel Lespinasse,
+ *****************************************************************************/
+static int HeaderInfo( const uint8_t * p,
+ int *pi_channels,
+ int *pi_sample_rate,
+ int *pi_frame_size )
+{
+ static const uint8_t halfrate[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3 };
+ static const int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
+ 128, 160, 192, 224, 256, 320, 384, 448,
+ 512, 576, 640 };
+ static const uint8_t lfeon[8] = { 0x10, 0x10, 0x04, 0x04,
+ 0x04, 0x01, 0x04, 0x01 };
+ int frmsizecod;
+ int bitrate;
+ int half;
+ int acmod;
+
+ if ((p[0] != 0x0b) || (p[1] != 0x77)) /* syncword */
+ return VLC_FALSE;
+
+ if (p[5] >= 0x60) /* bsid >= 12 */
+ return VLC_FALSE;
+ half = halfrate[p[5] >> 3];
+
+ /* acmod, dsurmod and lfeon */
+ acmod = p[6] >> 5;
+ if ( (p[6] & 0xf8) == 0x50 )
{
- msg_Warn( p_input, "synchro reinit" );
- p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
- p_input->stream.p_selected_program->i_synchro_state = SYNCHRO_OK;
+ /* Dolby surround = stereo + Dolby */
+ *pi_channels = 2;
+ }
+ else
+ {
+ static const int acmod_to_channels[8] =
+ {
+ 2 /* dual mono */, 1 /* mono */, 2 /* stereo */,
+ 3 /* 3F */, 3 /* 2f1R */,
+ 4 /* 3F1R */, 4, /* 2F2R */
+ 5 /* 3F2R */
+ };
+
+ *pi_channels = acmod_to_channels[acmod];
}
- input_DecodePES( p_fifo, p_pes );
+ if ( p[6] & lfeon[acmod] ) (*pi_channels)++; /* LFE */
- return 1;
+ frmsizecod = p[4] & 63;
+ if (frmsizecod >= 38)
+ return VLC_FALSE;
+ bitrate = rate[frmsizecod >> 1];
+
+ switch (p[4] & 0xc0) {
+ case 0:
+ *pi_sample_rate = 48000 >> half;
+ *pi_frame_size = 4 * bitrate;
+ return VLC_TRUE;
+ case 0x40:
+ *pi_sample_rate = 44100 >> half;
+ *pi_frame_size = 2 * (320 * bitrate / 147 + (frmsizecod & 1));
+ return VLC_TRUE;
+ case 0x80:
+ *pi_sample_rate = 32000 >> half;
+ *pi_frame_size =6 * bitrate;
+ return VLC_TRUE;
+ default:
+ return VLC_FALSE;
+ }
}
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