1 /*****************************************************************************
2 * flac.c : FLAC demux module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2003 VideoLAN
5 * $Id: flac.c,v 1.12 2004/03/03 11:40:19 fenrir Exp $
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
28 #include <vlc/input.h>
29 #include <vlc_codec.h>
31 /*****************************************************************************
33 *****************************************************************************/
34 static int Open ( vlc_object_t * );
35 static void Close ( vlc_object_t * );
38 set_description( _("FLAC demuxer") );
39 set_capability( "demux2", 155 );
40 set_callbacks( Open, Close );
41 add_shortcut( "flac" );
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Demux ( demux_t * );
48 static int Control( demux_t *, int, va_list );
56 decoder_t *p_packetizer;
59 #define STREAMINFO_SIZE 38
60 #define FLAC_PACKET_SIZE 16384
62 /*****************************************************************************
63 * Open: initializes ES structures
64 *****************************************************************************/
65 static int Open( vlc_object_t * p_this )
67 demux_t *p_demux = (demux_t*)p_this;
73 /* Have a peep at the show. */
74 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
76 /* Stream shorter than 4 bytes... */
77 msg_Err( p_demux, "cannot peek()" );
81 if( p_peek[0]!='f' || p_peek[1]!='L' || p_peek[2]!='a' || p_peek[3]!='C' )
83 if( strncmp( p_demux->psz_demux, "flac", 4 ) )
85 msg_Warn( p_demux, "flac module discarded (no startcode)" );
89 msg_Err( p_demux, "this doesn't look like a flac stream, "
90 "continuing anyway" );
93 p_demux->pf_demux = Demux;
94 p_demux->pf_control = Control;
95 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
96 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'f', 'l', 'a', 'c' ) );
97 p_sys->b_start = VLC_TRUE;
99 /* We need to read and store the STREAMINFO metadata */
100 i_peek = stream_Peek( p_demux->s, &p_peek, 8 );
101 if( p_peek[4] & 0x7F )
103 msg_Err( p_demux, "this isn't a STREAMINFO metadata block" );
107 if( ((p_peek[5]<<16)+(p_peek[6]<<8)+p_peek[7]) != (STREAMINFO_SIZE - 4) )
109 msg_Err( p_demux, "invalid size for a STREAMINFO metadata block" );
114 * Load the FLAC packetizer
116 p_sys->p_packetizer = vlc_object_create( p_demux, VLC_OBJECT_DECODER );
117 p_sys->p_packetizer->pf_decode_audio = 0;
118 p_sys->p_packetizer->pf_decode_video = 0;
119 p_sys->p_packetizer->pf_decode_sub = 0;
120 p_sys->p_packetizer->pf_packetize = 0;
122 /* Initialization of decoder structure */
123 es_format_Init( &p_sys->p_packetizer->fmt_in, AUDIO_ES,
124 VLC_FOURCC( 'f', 'l', 'a', 'c' ) );
126 /* Store STREAMINFO for the decoder and packetizer */
127 p_sys->p_packetizer->fmt_in.i_extra = fmt.i_extra = STREAMINFO_SIZE + 4;
128 p_sys->p_packetizer->fmt_in.p_extra = malloc( STREAMINFO_SIZE + 4 );
129 stream_Read( p_demux->s, p_sys->p_packetizer->fmt_in.p_extra,
130 STREAMINFO_SIZE + 4 );
132 /* Fake this as the last metadata block */
133 ((uint8_t*)p_sys->p_packetizer->fmt_in.p_extra)[4] |= 0x80;
134 fmt.p_extra = malloc( STREAMINFO_SIZE + 4 );
135 memcpy( fmt.p_extra, p_sys->p_packetizer->fmt_in.p_extra,
136 STREAMINFO_SIZE + 4 );
138 p_sys->p_packetizer->p_module =
139 module_Need( p_sys->p_packetizer, "packetizer", NULL );
140 if( !p_sys->p_packetizer->p_module )
142 if( p_sys->p_packetizer->fmt_in.p_extra )
143 free( p_sys->p_packetizer->fmt_in.p_extra );
145 vlc_object_destroy( p_sys->p_packetizer );
146 msg_Err( p_demux, "cannot find flac packetizer" );
150 p_sys->p_es = es_out_Add( p_demux->out, &fmt );
155 /*****************************************************************************
156 * Close: frees unused data
157 *****************************************************************************/
158 static void Close( vlc_object_t * p_this )
160 demux_t *p_demux = (demux_t*)p_this;
161 demux_sys_t *p_sys = p_demux->p_sys;
164 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
166 if( p_sys->p_packetizer->fmt_in.p_extra )
167 free( p_sys->p_packetizer->fmt_in.p_extra );
169 /* Delete the decoder */
170 vlc_object_destroy( p_sys->p_packetizer );
175 /*****************************************************************************
176 * Demux: reads and demuxes data packets
177 *****************************************************************************
178 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
179 *****************************************************************************/
180 static int Demux( demux_t *p_demux )
182 demux_sys_t *p_sys = p_demux->p_sys;
183 block_t *p_block_in, *p_block_out;
185 if( !( p_block_in = stream_Block( p_demux->s, FLAC_PACKET_SIZE ) ) )
192 p_block_in->i_pts = p_block_in->i_dts = 1;
193 p_sys->b_start = VLC_FALSE;
197 p_block_in->i_pts = p_block_in->i_dts = 0;
200 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
201 p_sys->p_packetizer, &p_block_in )) )
205 block_t *p_next = p_block_out->p_next;
208 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
210 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
212 p_block_out = p_next;
219 /*****************************************************************************
221 *****************************************************************************/
222 static int Control( demux_t *p_demux, int i_query, va_list args )
224 /* demux_sys_t *p_sys = p_demux->p_sys; */
226 return demux2_vaControlHelper( p_demux->s,
228 8*0, 1, i_query, args );