+++ /dev/null
-/*****************************************************************************
- * aac.c : Raw aac Stream input module for vlc
- *****************************************************************************
- * Copyright (C) 2001-2003 VideoLAN
- * $Id$
- *
- * 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
- * GNU General Public License for more details.
- *
- * 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.
- *****************************************************************************/
-
-/*****************************************************************************
- * Preamble
- *****************************************************************************/
-#include <stdlib.h> /* malloc(), free() */
-
-#include <vlc/vlc.h>
-#include <vlc/input.h>
-
-/*****************************************************************************
- * Module descriptor
- *****************************************************************************/
-static int Open ( vlc_object_t * );
-static void Close ( vlc_object_t * );
-
-vlc_module_begin();
- set_category( CAT_INPUT );
- set_subcategory( SUBCAT_INPUT_DEMUX );
- set_description( _("AAC demuxer" ) );
- set_capability( "demux2", 100 );
- set_callbacks( Open, Close );
- add_shortcut( "aac" );
-vlc_module_end();
-
-/* TODO:
- * - adif support ?
- *
- */
-
-/*****************************************************************************
- * Local prototypes
- *****************************************************************************/
-struct demux_sys_t
-{
- mtime_t i_time;
-
- es_out_id_t *p_es;
-};
-
-static int Demux ( demux_t * );
-static int Control( demux_t *, int, va_list );
-
-static int i_aac_samplerate[16] =
-{
- 96000, 88200, 64000, 48000, 44100, 32000,
- 24000, 22050, 16000, 12000, 11025, 8000,
- 7350, 0, 0, 0
-};
-
-#define AAC_ID( p ) ( ((p)[1]>>3)&0x01 )
-#define AAC_SAMPLE_RATE( p ) i_aac_samplerate[((p)[2]>>2)&0x0f]
-#define AAC_CHANNELS( p ) ( (((p)[2]&0x01)<<2) | (((p)[3]>>6)&0x03) )
-#define AAC_FRAME_SIZE( p ) ( (((p)[3]&0x03) << 11)|( (p)[4] << 3 )|( (((p)[5]) >>5)&0x7 ) )
-
-/* FIXME it's plain wrong */
-#define AAC_FRAME_SAMPLES( p ) 1024
-
-static inline int HeaderCheck( uint8_t *p )
-{
- if( p[0] != 0xff ||
- ( p[1]&0xf6 ) != 0xf0 ||
- AAC_SAMPLE_RATE( p ) == 0 ||
- AAC_CHANNELS( p ) == 0 ||
- AAC_FRAME_SIZE( p ) == 0 )
- {
- return VLC_FALSE;
- }
- return VLC_TRUE;
-}
-
-/*****************************************************************************
- * Open: initializes AAC demux structures
- *****************************************************************************/
-static int Open( vlc_object_t * p_this )
-{
- demux_t *p_demux = (demux_t*)p_this;
- demux_sys_t *p_sys;
- int b_forced = VLC_FALSE;
-
- uint8_t *p_peek;
- module_t *p_id3;
- es_format_t fmt;
-
- if( !strncmp( p_demux->psz_demux, "aac", 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], ".aac" ) )
- {
- b_forced = VLC_TRUE;
- }
- }
-
- if( !b_forced )
- {
- /* I haven't find any sure working aac detection so only forced or
- * extention check
- */
- return VLC_EGENERIC;
- }
-
- /* skip possible id3 header */
- if( ( p_id3 = module_Need( p_demux, "id3", NULL, 0 ) ) )
- {
- module_Unneed( p_demux, p_id3 );
- }
-
- p_demux->pf_demux = Demux;
- p_demux->pf_control = Control;
- p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
-
- p_sys->i_time = 1;
-
- /* peek the begining (10 is for adts header) */
- if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
- {
- msg_Err( p_demux, "cannot peek" );
- goto error;
- }
- if( !strncmp( p_peek, "ADIF", 4 ) )
- {
- msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
- goto error;
- }
-
- es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', '4', 'a' ) );
- if( HeaderCheck( p_peek ) )
- {
- fmt.audio.i_channels = AAC_CHANNELS( p_peek );
- fmt.audio.i_rate = AAC_SAMPLE_RATE( p_peek );
-
- msg_Dbg( p_demux,
- "adts header: id=%d channels=%d sample_rate=%d",
- AAC_ID( p_peek ),
- AAC_CHANNELS( p_peek ),
- AAC_SAMPLE_RATE( p_peek ) );
- }
-
- p_sys->p_es = es_out_Add( p_demux->out, &fmt );
- return VLC_SUCCESS;
-
-error:
- free( p_sys );
- return VLC_EGENERIC;
-}
-
-
-/*****************************************************************************
- * Demux: reads and demuxes data packets
- *****************************************************************************
- * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
- *****************************************************************************/
-static int Demux( demux_t *p_demux )
-{
- demux_sys_t *p_sys = p_demux->p_sys;
- block_t *p_block;
-
- uint8_t h[8];
- uint8_t *p_peek;
-
- if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
- {
- msg_Warn( p_demux, "cannot peek" );
- return 0;
- }
-
- 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_demux->s, &p_peek, 8096 );
- if( i_peek < 8 )
- {
- msg_Warn( p_demux, "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_demux, "garbage=%d bytes", i_skip );
- stream_Read( p_demux->s, NULL, i_skip );
- return 1;
- }
-
- memcpy( h, p_peek, 8 ); /* can't use p_peek after stream_* */
-
-
-
- /* set PCR */
- es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time );
-
- if( ( p_block = stream_Block( p_demux->s, AAC_FRAME_SIZE( h ) ) ) == NULL )
- {
- msg_Warn( p_demux, "cannot read data" );
- return 0;
- }
-
- p_block->i_dts = p_block->i_pts = p_sys->i_time;
-
- es_out_Send( p_demux->out, p_sys->p_es, p_block );
-
- p_sys->i_time += (mtime_t)1000000 *
- (mtime_t)AAC_FRAME_SAMPLES( h ) /
- (mtime_t)AAC_SAMPLE_RATE( h );
- return( 1 );
-}
-
-/*****************************************************************************
- * Close: frees unused data
- *****************************************************************************/
-static void Close( vlc_object_t * p_this )
-{
- demux_t *p_demux = (demux_t*)p_this;
- demux_sys_t *p_sys = p_demux->p_sys;
-
- free( p_sys );
-}
-
-/*****************************************************************************
- * Control:
- *****************************************************************************/
-static int Control( demux_t *p_demux, int i_query, va_list args )
-{
- /* demux_sys_t *p_sys = p_demux->p_sys; */
- /* FIXME calculate the bitrate */
- if( i_query == DEMUX_SET_TIME )
- return VLC_EGENERIC;
- else
- return demux2_vaControlHelper( p_demux->s,
- 0, -1,
- 8*0, 1, i_query, args );
-}
-
projects / vlc / commitdiff