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306 lines
9.1 KiB
306 lines
9.1 KiB
/*****************************************************************************
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* aac.c : Raw aac Stream input module for vlc
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*****************************************************************************
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* Copyright (C) 2001 VideoLAN
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* $Id: aac.c,v 1.4 2003/09/12 16:26:40 fenrir Exp $
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* malloc(), free() */
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#include <vlc/vlc.h>
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#include <vlc/input.h>
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close ( vlc_object_t * );
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vlc_module_begin();
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set_description( _("AAC demuxer" ) );
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set_capability( "demux", 10 );
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set_callbacks( Open, Close );
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add_shortcut( "aac" );
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vlc_module_end();
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/* TODO:
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* - adif support ?
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*
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*/
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Demux ( input_thread_t * );
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struct demux_sys_t
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{
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mtime_t i_time;
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es_descriptor_t *p_es;
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};
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static int i_aac_samplerate[16] =
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{
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96000, 88200, 64000, 48000, 44100, 32000,
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24000, 22050, 16000, 12000, 11025, 8000,
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7350, 0, 0, 0
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};
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#define AAC_ID( p ) ( ((p)[1]>>3)&0x01 )
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#define AAC_SAMPLE_RATE( p ) i_aac_samplerate[((p)[2]>>2)&0x0f]
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#define AAC_CHANNELS( p ) ( (((p)[2]&0x01)<<2) | (((p)[3]>>6)&0x03) )
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#define AAC_FRAME_SIZE( p ) ( (((p)[3]&0x03) << 11)|( (p)[4] << 3 )|( (((p)[5]) >>5)&0x7 ) )
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/* FIXME it's plain wrong */
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#define AAC_FRAME_SAMPLES( p ) 1024
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static inline int HeaderCheck( uint8_t *p )
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{
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if( p[0] != 0xff ||
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( p[1]&0xf6 ) != 0xf0 ||
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AAC_SAMPLE_RATE( p ) == 0 ||
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AAC_CHANNELS( p ) == 0 ||
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AAC_FRAME_SIZE( p ) == 0 )
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{
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return VLC_FALSE;
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}
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return VLC_TRUE;
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}
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/*****************************************************************************
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* Open: initializes AAC demux structures
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*****************************************************************************/
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static int Open( vlc_object_t * p_this )
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{
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input_thread_t *p_input = (input_thread_t *)p_this;
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demux_sys_t *p_sys;
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int b_forced = VLC_FALSE;
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uint8_t *p_peek;
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module_t *p_id3;
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if( p_input->psz_demux && !strncmp( p_input->psz_demux, "aac", 3 ) )
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{
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b_forced = VLC_TRUE;
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}
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if( p_input->psz_name )
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{
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int i_len = strlen( p_input->psz_name );
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if( i_len > 4 && !strcasecmp( &p_input->psz_name[i_len - 4], ".aac" ) )
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{
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b_forced = VLC_TRUE;
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}
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}
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if( !b_forced )
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{
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/* I haven't find any sure working aac detection so only forced or
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* extention check
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*/
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msg_Warn( p_input, "AAC module discarded" );
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return VLC_EGENERIC;
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}
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/* skip possible id3 header */
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p_id3 = module_Need( p_input, "id3", NULL );
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if ( p_id3 )
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{
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module_Unneed( p_input, p_id3 );
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}
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p_input->pf_demux = Demux;
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p_input->pf_demux_control = demux_vaControlDefault;
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p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
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p_sys->i_time = 0;
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/* peek the begining (10 is for adts header) */
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if( stream_Peek( p_input->s, &p_peek, 10 ) < 10 )
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{
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msg_Err( p_input, "cannot peek" );
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goto error;
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}
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if( !strncmp( p_peek, "ADIF", 4 ) )
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{
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msg_Err( p_input, "ADIF file. Not yet supported. (Please report)" );
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goto error;
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}
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if( HeaderCheck( p_peek ) )
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{
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input_info_category_t * p_category;
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msg_Dbg( p_input,
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"adts header: id=%d channels=%d sample_rate=%d",
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AAC_ID( p_peek ),
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AAC_CHANNELS( p_peek ),
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AAC_SAMPLE_RATE( p_peek ) );
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vlc_mutex_lock( &p_input->stream.stream_lock );
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p_category = input_InfoCategory( p_input, _("Aac") );
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input_AddInfo( p_category, _("Input Type"), "MPEG-%d AAC",
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AAC_ID( p_peek ) == 1 ? 2 : 4 );
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input_AddInfo( p_category, _("Channels"), "%d",
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AAC_CHANNELS( p_peek ) );
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input_AddInfo( p_category, _("Sample Rate"), "%dHz",
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AAC_SAMPLE_RATE( p_peek ) );
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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}
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vlc_mutex_lock( &p_input->stream.stream_lock );
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if( input_InitStream( p_input, 0 ) == -1)
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{
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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msg_Err( p_input, "cannot init stream" );
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goto error;
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}
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if( input_AddProgram( p_input, 0, 0) == NULL )
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{
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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msg_Err( p_input, "cannot add program" );
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goto error;
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}
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p_input->stream.pp_programs[0]->b_is_ok = 0;
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p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
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p_input->stream.i_mux_rate = 0 / 50;
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p_sys->p_es = input_AddES( p_input,
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p_input->stream.p_selected_program,
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1 , AUDIO_ES, NULL, 0 );
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p_sys->p_es->i_stream_id = 1;
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p_sys->p_es->i_fourcc = VLC_FOURCC( 'm', 'p', '4', 'a' );
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input_SelectES( p_input, p_sys->p_es );
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p_input->stream.p_selected_program->b_is_ok = 1;
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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return VLC_SUCCESS;
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error:
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free( p_sys );
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return VLC_EGENERIC;
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}
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/*****************************************************************************
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* Demux: reads and demuxes data packets
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*****************************************************************************
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* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
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*****************************************************************************/
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static int Demux( input_thread_t * p_input )
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{
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demux_sys_t *p_sys = p_input->p_demux_data;
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pes_packet_t *p_pes;
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uint8_t h[8];
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uint8_t *p_peek;
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if( stream_Peek( p_input->s, &p_peek, 8 ) < 8 )
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{
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msg_Warn( p_input, "cannot peek" );
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return 0;
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}
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if( !HeaderCheck( p_peek ) )
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{
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/* we need to resynch */
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vlc_bool_t b_ok = VLC_FALSE;
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int i_skip = 0;
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int i_peek;
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i_peek = stream_Peek( p_input->s, &p_peek, 8096 );
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if( i_peek < 8 )
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{
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msg_Warn( p_input, "cannot peek" );
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return 0;
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}
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while( i_peek >= 8 )
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{
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if( HeaderCheck( p_peek ) )
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{
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b_ok = VLC_TRUE;
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break;
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}
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p_peek++;
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i_peek--;
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i_skip++;
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}
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msg_Warn( p_input, "garbage=%d bytes", i_skip );
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stream_Read( p_input->s, NULL, i_skip );
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return 1;
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}
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memcpy( h, p_peek, 8 ); /* can't use p_peek after stream_* */
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input_ClockManageRef( p_input,
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p_input->stream.p_selected_program,
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p_sys->i_time * 9 / 100 );
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if( ( p_pes = stream_PesPacket( p_input->s, AAC_FRAME_SIZE( h ) ) )==NULL )
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{
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msg_Warn( p_input, "cannot read data" );
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return 0;
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}
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p_pes->i_dts =
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p_pes->i_pts = input_ClockGetTS( p_input,
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p_input->stream.p_selected_program,
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p_sys->i_time * 9 / 100 );
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if( !p_sys->p_es->p_decoder_fifo )
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{
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msg_Err( p_input, "no audio decoder" );
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input_DeletePES( p_input->p_method_data, p_pes );
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return( -1 );
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}
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input_DecodePES( p_sys->p_es->p_decoder_fifo, p_pes );
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p_sys->i_time += (mtime_t)1000000 *
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(mtime_t)AAC_FRAME_SAMPLES( h ) /
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(mtime_t)AAC_SAMPLE_RATE( h );
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return( 1 );
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}
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/*****************************************************************************
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* Close: frees unused data
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*****************************************************************************/
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static void Close( vlc_object_t * p_this )
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{
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input_thread_t *p_input = (input_thread_t*)p_this;
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demux_sys_t *p_sys = p_input->p_demux_data;
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free( p_sys );
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}
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