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 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
35 #include <vlc_codec.h>
36 #include <vlc_input.h>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int Open ( vlc_object_t * );
42 static void Close( vlc_object_t * );
45 set_category( CAT_INPUT );
46 set_subcategory( SUBCAT_INPUT_DEMUX );
47 set_description( N_("MPEG-4 audio demuxer" ) );
48 set_capability( "demux", 110 );
49 set_callbacks( Open, Close );
50 add_shortcut( "m4a" );
51 add_shortcut( "mp4a" );
52 add_shortcut( "aac" );
55 /*****************************************************************************
57 *****************************************************************************/
63 decoder_t *p_packetizer;
67 mtime_t i_time_offset;
71 static int Demux( demux_t * );
72 static int Control( demux_t *, int, va_list );
74 #define M4A_PACKET_SIZE 4096
75 #define M4A_PTS_START 1
77 /*****************************************************************************
78 * Open: initializes demux structures
79 *****************************************************************************/
80 static int Open( vlc_object_t * p_this )
82 demux_t *p_demux = (demux_t*)p_this;
84 const uint8_t *p_peek;
87 if( demux_IsPathExtension( p_demux, ".aac" ) )
90 if( !p_demux->b_force && !b_forced )
93 /* peek the begining (10 is for adts header) */
94 if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
96 msg_Err( p_demux, "cannot peek" );
99 if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
101 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
105 p_demux->pf_demux = Demux;
106 p_demux->pf_control= Control;
107 p_demux->p_sys = p_sys = calloc( sizeof( demux_sys_t ), 1 );
108 p_sys->b_start = true;
110 /* Load the mpeg 4 audio packetizer */
111 INIT_APACKETIZER( p_sys->p_packetizer, 'm', 'p', '4', 'a' );
112 es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );
113 LOAD_PACKETIZER_OR_FAIL( p_sys->p_packetizer, "mp4 audio" );
118 /*****************************************************************************
119 * Close: frees unused data
120 *****************************************************************************/
121 static void Close( vlc_object_t * p_this )
123 demux_t *p_demux = (demux_t*)p_this;
124 demux_sys_t *p_sys = p_demux->p_sys;
126 DESTROY_PACKETIZER( p_sys->p_packetizer );
131 /*****************************************************************************
132 * Demux: reads and demuxes data packets
133 *****************************************************************************
134 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
135 *****************************************************************************/
136 static int Demux( demux_t *p_demux)
138 demux_sys_t *p_sys = p_demux->p_sys;
139 block_t *p_block_in, *p_block_out;
141 if( ( p_block_in = stream_Block( p_demux->s, M4A_PACKET_SIZE ) ) == NULL )
146 p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start ? M4A_PTS_START : 0;
147 p_sys->b_start = false;
149 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
150 p_sys->p_packetizer, &p_block_in )) )
154 block_t *p_next = p_block_out->p_next;
156 if( p_sys->p_es == NULL )
158 p_sys->p_packetizer->fmt_out.b_packetized = true;
159 p_sys->p_es = es_out_Add( p_demux->out,
160 &p_sys->p_packetizer->fmt_out);
163 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
165 p_block_out->p_next = NULL;
167 p_sys->i_pts = p_block_out->i_pts;
168 if( p_sys->i_pts > M4A_PTS_START + INT64_C(500000) )
169 p_sys->i_bitrate_avg =
170 8*INT64_C(1000000)*p_sys->i_bytes/(p_sys->i_pts-M4A_PTS_START);
172 p_sys->i_bytes += p_block_out->i_buffer;
173 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
175 p_block_out = p_next;
181 /*****************************************************************************
183 *****************************************************************************/
184 static int Control( demux_t *p_demux, int i_query, va_list args )
186 demux_sys_t *p_sys = p_demux->p_sys;
193 case DEMUX_HAS_UNSUPPORTED_META:
194 pb_bool = (bool *)va_arg( args, bool* );
199 pi64 = (int64_t*)va_arg( args, int64_t * );
200 *pi64 = p_sys->i_pts + p_sys->i_time_offset;
203 case DEMUX_SET_TIME: /* TODO high precision seek for multi-input */
205 i_ret = demux_vaControlHelper( p_demux->s, 0, -1,
206 p_sys->i_bitrate_avg, 1, i_query, args);
207 /* Fix time_offset */
208 if( (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME ) &&
209 i_ret == VLC_SUCCESS && p_sys->i_bitrate_avg > 0 )
211 int64_t i_time = INT64_C(8000000) * stream_Tell(p_demux->s) /
212 p_sys->i_bitrate_avg;
215 p_sys->i_time_offset = i_time - p_sys->i_pts;