1 /*****************************************************************************
2 * m4a.c : MPEG-4 audio demuxer
3 *****************************************************************************
4 * Copyright (C) 2002-2004 the VideoLAN team
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
29 #include <vlc_demux.h>
30 #include "vlc_codec.h"
32 /*****************************************************************************
34 *****************************************************************************/
35 static int Open ( vlc_object_t * );
36 static void Close( vlc_object_t * );
39 set_category( CAT_INPUT );
40 set_subcategory( SUBCAT_INPUT_DEMUX );
41 set_description( _("MPEG-4 audio demuxer" ) );
42 set_capability( "demux2", 110 );
43 set_callbacks( Open, Close );
44 add_shortcut( "m4a" );
45 add_shortcut( "mp4a" );
46 add_shortcut( "aac" );
49 /*****************************************************************************
51 *****************************************************************************/
58 decoder_t *p_packetizer;
62 mtime_t i_time_offset;
66 static int Demux( demux_t * );
67 static int Control( demux_t *, int, va_list );
69 #define M4A_PACKET_SIZE 4096
70 #define M4A_PTS_START 1
72 /*****************************************************************************
73 * Open: initializes demux structures
74 *****************************************************************************/
75 static int Open( vlc_object_t * p_this )
77 demux_t *p_demux = (demux_t*)p_this;
80 const uint8_t *p_peek;
81 int b_forced = VLC_FALSE;
83 if( demux2_IsPathExtension( p_demux, ".aac" ) )
86 if( !p_demux->b_force && !b_forced )
89 /* peek the begining (10 is for adts header) */
90 if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
92 msg_Err( p_demux, "cannot peek" );
95 if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
97 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
101 p_demux->pf_demux = Demux;
102 p_demux->pf_control= Control;
103 p_demux->p_sys = p_sys = calloc( sizeof( demux_sys_t ), 1 );
104 p_sys->b_start = VLC_TRUE;
106 /* Load the mpeg 4 audio packetizer */
107 INIT_APACKETIZER( p_sys->p_packetizer, 'm', 'p', '4', 'a' );
108 es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );
109 LOAD_PACKETIZER_OR_FAIL( p_sys->p_packetizer, "mp4 audio" );
111 /* Parse possible id3 header */
112 if( !var_CreateGetBool( p_demux, "meta-preparsed" ) )
114 p_demux->p_private = malloc( sizeof( demux_meta_t ) );
115 if( !p_demux->p_private )
117 if( ( p_id3 = module_Need( p_demux, "meta reader", NULL, 0 ) ) )
119 module_Unneed( p_demux, p_id3 );
120 demux_meta_t *p_demux_meta = (demux_meta_t *)p_demux->p_private;
121 p_sys->meta = p_demux_meta->p_meta;
123 /* attachments not supported in this demuxer */
124 for( i = 0; i < p_demux_meta->i_attachments; i++ )
125 free( p_demux_meta->attachments[i] );
126 TAB_CLEAN( p_demux_meta->i_attachments, p_demux_meta->attachments );
128 free( p_demux->p_private );
133 /*****************************************************************************
134 * Close: frees unused data
135 *****************************************************************************/
136 static void Close( vlc_object_t * p_this )
138 demux_t *p_demux = (demux_t*)p_this;
139 demux_sys_t *p_sys = p_demux->p_sys;
141 var_Destroy( p_demux, "meta-preparsed" );
142 if( p_sys->meta ) vlc_meta_Delete( p_sys->meta );
144 DESTROY_PACKETIZER( p_sys->p_packetizer );
149 /*****************************************************************************
150 * Demux: reads and demuxes data packets
151 *****************************************************************************
152 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
153 *****************************************************************************/
154 static int Demux( demux_t *p_demux)
156 demux_sys_t *p_sys = p_demux->p_sys;
157 block_t *p_block_in, *p_block_out;
159 if( ( p_block_in = stream_Block( p_demux->s, M4A_PACKET_SIZE ) ) == NULL )
164 p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start ? M4A_PTS_START : 0;
165 p_sys->b_start = VLC_FALSE;
167 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
168 p_sys->p_packetizer, &p_block_in )) )
172 block_t *p_next = p_block_out->p_next;
174 if( p_sys->p_es == NULL )
176 p_sys->p_packetizer->fmt_out.b_packetized = VLC_TRUE;
177 vlc_audio_replay_gain_MergeFromMeta( &p_sys->p_packetizer->fmt_out.audio_replay_gain,
179 p_sys->p_es = es_out_Add( p_demux->out,
180 &p_sys->p_packetizer->fmt_out);
183 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
185 p_block_out->p_next = NULL;
187 p_sys->i_pts = p_block_out->i_pts;
188 if( p_sys->i_pts > M4A_PTS_START + I64C(500000) )
189 p_sys->i_bitrate_avg =
190 8*I64C(1000000)*p_sys->i_bytes/(p_sys->i_pts-M4A_PTS_START);
192 p_sys->i_bytes += p_block_out->i_buffer;
193 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
195 p_block_out = p_next;
201 /*****************************************************************************
203 *****************************************************************************/
204 static int Control( demux_t *p_demux, int i_query, va_list args )
206 demux_sys_t *p_sys = p_demux->p_sys;
215 p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t* );
216 vlc_meta_Merge( p_meta, p_sys->meta );
220 pi64 = (int64_t*)va_arg( args, int64_t * );
221 *pi64 = p_sys->i_pts + p_sys->i_time_offset;
224 case DEMUX_SET_TIME: /* TODO high precision seek for multi-input */
226 i_ret = demux2_vaControlHelper( p_demux->s, 0, -1,
227 p_sys->i_bitrate_avg, 1, i_query, args);
228 /* Fix time_offset */
229 if( (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME ) &&
230 i_ret == VLC_SUCCESS && p_sys->i_bitrate_avg > 0 )
232 int64_t i_time = I64C(8000000) * stream_Tell(p_demux->s) /
233 p_sys->i_bitrate_avg;
236 p_sys->i_time_offset = i_time - p_sys->i_pts;