1 /*****************************************************************************
2 * m4a.c : MPEG-4 audio demuxer
3 *****************************************************************************
4 * Copyright (C) 2002-2004 VideoLAN
5 * $Id: m4v.c 7754 2004-05-23 14:43:14Z fenrir $
7 * Authors: Gildas Bazin <gbazin@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc/input.h>
31 #include "vlc_codec.h"
33 /*****************************************************************************
35 *****************************************************************************/
36 static int Open ( vlc_object_t * );
37 static void Close( vlc_object_t * );
40 set_category( CAT_INPUT );
41 set_subcategory( SUBCAT_INPUT_DEMUX );
42 set_description( _("MPEG-4 audio demuxer" ) );
43 set_capability( "demux2", 110 );
44 set_callbacks( Open, Close );
45 add_shortcut( "m4a" );
46 add_shortcut( "mp4a" );
47 add_shortcut( "aac" );
50 /*****************************************************************************
52 *****************************************************************************/
58 decoder_t *p_packetizer;
61 static int Demux( demux_t * );
62 static int Control( demux_t *, int, va_list );
64 #define M4A_PACKET_SIZE 4096
66 /*****************************************************************************
67 * Open: initializes demux structures
68 *****************************************************************************/
69 static int Open( vlc_object_t * p_this )
71 demux_t *p_demux = (demux_t*)p_this;
75 int b_forced = VLC_FALSE;
77 if( p_demux->psz_path )
79 int i_len = strlen( p_demux->psz_path );
81 if( i_len > 4 && !strcasecmp( &p_demux->psz_path[i_len - 4], ".aac" ) )
87 if( !p_demux->b_force && !b_forced )
92 /* skip possible id3 header */
93 if( ( p_id3 = module_Need( p_demux, "id3", NULL, 0 ) ) )
95 module_Unneed( p_demux, p_id3 );
98 /* peek the begining (10 is for adts header) */
99 if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
101 msg_Err( p_demux, "cannot peek" );
104 if( !strncmp( p_peek, "ADIF", 4 ) )
106 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
110 p_demux->pf_demux = Demux;
111 p_demux->pf_control= Control;
112 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
114 p_sys->b_start = VLC_TRUE;
117 * Load the mpeg 4 audio packetizer
119 p_sys->p_packetizer = vlc_object_create( p_demux, VLC_OBJECT_PACKETIZER );
120 p_sys->p_packetizer->pf_decode_audio = NULL;
121 p_sys->p_packetizer->pf_decode_video = NULL;
122 p_sys->p_packetizer->pf_decode_sub = NULL;
123 p_sys->p_packetizer->pf_packetize = NULL;
124 es_format_Init( &p_sys->p_packetizer->fmt_in, AUDIO_ES,
125 VLC_FOURCC( 'm', 'p', '4', 'a' ) );
126 es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );
127 p_sys->p_packetizer->p_module =
128 module_Need( p_sys->p_packetizer, "packetizer", NULL, 0 );
130 if( p_sys->p_packetizer->p_module == NULL)
132 vlc_object_destroy( p_sys->p_packetizer );
133 msg_Err( p_demux, "cannot find mp4a packetizer" );
141 /*****************************************************************************
142 * Close: frees unused data
143 *****************************************************************************/
144 static void Close( vlc_object_t * p_this )
146 demux_t *p_demux = (demux_t*)p_this;
147 demux_sys_t *p_sys = p_demux->p_sys;
149 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
150 vlc_object_destroy( p_sys->p_packetizer );
155 /*****************************************************************************
156 * Demux: reads and demuxes data packets
157 *****************************************************************************
158 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
159 *****************************************************************************/
160 static int Demux( demux_t *p_demux)
162 demux_sys_t *p_sys = p_demux->p_sys;
163 block_t *p_block_in, *p_block_out;
165 if( ( p_block_in = stream_Block( p_demux->s, M4A_PACKET_SIZE ) ) == NULL )
170 p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start ? 1 : 0;
171 p_sys->b_start = VLC_FALSE;
173 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
174 p_sys->p_packetizer, &p_block_in )) )
178 block_t *p_next = p_block_out->p_next;
180 if( p_sys->p_es == NULL )
182 p_sys->p_packetizer->fmt_out.b_packetized = VLC_TRUE;
183 p_sys->p_es = es_out_Add( p_demux->out,
184 &p_sys->p_packetizer->fmt_out);
187 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
189 p_block_out->p_next = NULL;
190 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
192 p_block_out = p_next;
198 /*****************************************************************************
200 *****************************************************************************/
201 static int Control( demux_t *p_demux, int i_query, va_list args )
203 if( i_query == DEMUX_SET_TIME ) return VLC_EGENERIC;
204 else return demux2_vaControlHelper( p_demux->s, 0, -1,
205 0, 1, i_query, args );