1 /*****************************************************************************
2 * flac.c : FLAC demux module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2003 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
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 *****************************************************************************/
28 #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_description( _("FLAC demuxer") );
40 set_capability( "demux2", 155 );
41 set_category( CAT_INPUT );
42 set_subcategory( SUBCAT_INPUT_DEMUX );
43 set_callbacks( Open, Close );
44 add_shortcut( "flac" );
47 /*****************************************************************************
49 *****************************************************************************/
50 static int Demux ( demux_t * );
51 static int Control( demux_t *, int, va_list );
59 decoder_t *p_packetizer;
63 #define STREAMINFO_SIZE 38
64 #define FLAC_PACKET_SIZE 16384
66 /*****************************************************************************
67 * Open: initializes ES structures
68 *****************************************************************************/
69 static int Open( vlc_object_t * p_this )
71 demux_t *p_demux = (demux_t*)p_this;
78 /* Have a peep at the show. */
79 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
81 if( p_peek[0]!='f' || p_peek[1]!='L' || p_peek[2]!='a' || p_peek[3]!='C' )
83 if( !p_demux->b_force ) return VLC_EGENERIC;
86 msg_Err( p_demux, "this doesn't look like a flac stream, "
87 "continuing anyway" );
90 p_demux->pf_demux = Demux;
91 p_demux->pf_control = Control;
92 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
93 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'f', 'l', 'a', 'c' ) );
94 p_sys->b_start = VLC_TRUE;
97 /* We need to read and store the STREAMINFO metadata */
98 i_peek = stream_Peek( p_demux->s, &p_peek, 8 );
99 if( p_peek[4] & 0x7F )
101 msg_Err( p_demux, "this isn't a STREAMINFO metadata block" );
105 if( ((p_peek[5]<<16)+(p_peek[6]<<8)+p_peek[7]) != (STREAMINFO_SIZE - 4) )
107 msg_Err( p_demux, "invalid size for a STREAMINFO metadata block" );
111 /* Load the FLAC packetizer */
112 INIT_APACKETIZER( p_sys->p_packetizer, 'f', 'l', 'a', 'c' );
114 /* Store STREAMINFO for the decoder and packetizer */
115 p_sys->p_packetizer->fmt_in.i_extra = fmt.i_extra = STREAMINFO_SIZE + 4;
116 p_sys->p_packetizer->fmt_in.p_extra = malloc( STREAMINFO_SIZE + 4 );
117 stream_Read( p_demux->s, p_sys->p_packetizer->fmt_in.p_extra,
118 STREAMINFO_SIZE + 4 );
120 /* Fake this as the last metadata block */
121 ((uint8_t*)p_sys->p_packetizer->fmt_in.p_extra)[4] |= 0x80;
122 fmt.p_extra = malloc( STREAMINFO_SIZE + 4 );
123 memcpy( fmt.p_extra, p_sys->p_packetizer->fmt_in.p_extra,
124 STREAMINFO_SIZE + 4 );
126 p_sys->p_packetizer->p_module =
127 module_Need( p_sys->p_packetizer, "packetizer", NULL, 0 );
128 if( !p_sys->p_packetizer->p_module )
130 if( p_sys->p_packetizer->fmt_in.p_extra )
131 free( p_sys->p_packetizer->fmt_in.p_extra );
132 vlc_object_destroy( p_sys->p_packetizer );
134 msg_Err( p_demux, "cannot find flac packetizer" );
138 p_sys->p_es = es_out_Add( p_demux->out, &fmt );
140 /* Parse possible id3 header */
141 if( ( p_id3 = module_Need( p_demux, "meta reader", NULL, 0 ) ) )
143 p_sys->p_meta = (vlc_meta_t *)p_demux->p_private;
144 p_demux->p_private = NULL;
145 module_Unneed( p_demux, p_id3 );
151 /*****************************************************************************
152 * Close: frees unused data
153 *****************************************************************************/
154 static void Close( vlc_object_t * p_this )
156 demux_t *p_demux = (demux_t*)p_this;
157 demux_sys_t *p_sys = p_demux->p_sys;
160 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
162 if( p_sys->p_packetizer->fmt_in.p_extra )
163 free( p_sys->p_packetizer->fmt_in.p_extra );
165 /* Delete the decoder */
166 vlc_object_destroy( p_sys->p_packetizer );
167 if( p_sys->p_meta ) vlc_meta_Delete( p_sys->p_meta );
171 /*****************************************************************************
172 * Demux: reads and demuxes data packets
173 *****************************************************************************
174 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
175 *****************************************************************************/
176 static int Demux( demux_t *p_demux )
178 demux_sys_t *p_sys = p_demux->p_sys;
179 block_t *p_block_in, *p_block_out;
181 if( !( p_block_in = stream_Block( p_demux->s, FLAC_PACKET_SIZE ) ) )
188 p_block_in->i_pts = p_block_in->i_dts = 1;
189 p_sys->b_start = VLC_FALSE;
193 p_block_in->i_pts = p_block_in->i_dts = 0;
196 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
197 p_sys->p_packetizer, &p_block_in )) )
201 block_t *p_next = p_block_out->p_next;
204 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
206 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
208 p_block_out = p_next;
215 /*****************************************************************************
217 *****************************************************************************/
218 static int Control( demux_t *p_demux, int i_query, va_list args )
220 /* demux_sys_t *p_sys = p_demux->p_sys; */
222 if( i_query == DEMUX_SET_TIME ) return VLC_EGENERIC;
223 else if( i_query == DEMUX_GET_META )
225 vlc_meta_t *p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t* );
226 if( p_demux->p_sys->p_meta )
227 vlc_meta_Merge( p_meta, p_demux->p_sys->p_meta );
230 else return demux2_vaControlHelper( p_demux->s, 0, -1,
231 8*0, 1, i_query, args );