1 /*****************************************************************************
2 * file.c : audio output which writes the samples to a file
3 *****************************************************************************
4 * Copyright (C) 2002 the VideoLAN team
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
8 * Gildas Bazin <gbazin@netcourrier.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
36 #include <vlc_codecs.h> /* WAVEHEADER */
39 #define A52_FRAME_NB 1536
41 /*****************************************************************************
42 * aout_sys_t: audio output method descriptor
43 *****************************************************************************
44 * This structure is part of the audio output thread descriptor.
45 * It describes the direct sound specific properties of an audio device.
46 *****************************************************************************/
50 bool b_add_wav_header;
52 WAVEHEADER waveh; /* Wave header of the output file */
55 #define CHANNELS_MAX 6
56 static const int pi_channels_maps[CHANNELS_MAX+1] =
60 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
61 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
62 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
63 | AOUT_CHAN_REARRIGHT,
64 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
65 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
66 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
67 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
70 /*****************************************************************************
72 *****************************************************************************/
73 static int Open ( vlc_object_t * );
74 static void Close ( vlc_object_t * );
75 static void Play ( audio_output_t *, block_t * );
77 /*****************************************************************************
79 *****************************************************************************/
80 #define FORMAT_TEXT N_("Output format")
81 #define FORMAT_LONGTEXT N_("One of \"u8\", \"s8\", \"u16\", \"s16\", " \
82 "\"u16_le\", \"s16_le\", \"u16_be\", \"s16_be\", \"fixed32\", " \
83 "\"float32\" or \"spdif\"")
84 #define CHANNELS_TEXT N_("Number of output channels")
85 #define CHANNELS_LONGTEXT N_("By default, all the channels of the incoming " \
86 "will be saved but you can restrict the number of channels here.")
88 #define WAV_TEXT N_("Add WAVE header")
89 #define WAV_LONGTEXT N_("Instead of writing a raw file, you can add a WAV " \
90 "header to the file.")
92 static const char *const format_list[] = { "u8", "s8", "u16", "s16", "u16_le",
93 "s16_le", "u16_be", "s16_be", "fixed32",
95 static const int format_int[] = { VLC_CODEC_U8,
97 VLC_CODEC_U16N, VLC_CODEC_S16N,
106 #define FILE_TEXT N_("Output file")
107 #define FILE_LONGTEXT N_("File to which the audio samples will be written to. (\"-\" for stdout")
110 set_description( N_("File audio output") )
111 set_shortname( N_("File") )
112 set_category( CAT_AUDIO )
113 set_subcategory( SUBCAT_AUDIO_AOUT )
115 add_string( "audiofile-format", "s16",
116 FORMAT_TEXT, FORMAT_LONGTEXT, true )
117 change_string_list( format_list, 0, 0 )
118 add_integer( "audiofile-channels", 0,
119 CHANNELS_TEXT, CHANNELS_LONGTEXT, true )
120 add_savefile( "audiofile-file", "audiofile.wav", FILE_TEXT,
121 FILE_LONGTEXT, false )
122 add_bool( "audiofile-wav", true, WAV_TEXT, WAV_LONGTEXT, true )
124 set_capability( "audio output", 0 )
125 add_shortcut( "file", "audiofile" )
126 set_callbacks( Open, Close )
129 /*****************************************************************************
130 * Open: open a dummy audio device
131 *****************************************************************************/
132 static int Open( vlc_object_t * p_this )
134 audio_output_t * p_aout = (audio_output_t *)p_this;
135 char * psz_name, * psz_format;
136 const char * const * ppsz_compare = format_list;
137 int i_channels, i = 0;
139 psz_name = var_CreateGetString( p_this, "audiofile-file" );
140 if( !psz_name || !*psz_name )
142 msg_Err( p_aout, "you need to specify an output file name" );
147 /* Allocate structure */
148 p_aout->sys = malloc( sizeof( aout_sys_t ) );
149 if( p_aout->sys == NULL )
152 if( !strcmp( psz_name, "-" ) )
153 p_aout->sys->p_file = stdout;
155 p_aout->sys->p_file = vlc_fopen( psz_name, "wb" );
158 if ( p_aout->sys->p_file == NULL )
164 p_aout->pf_play = Play;
165 p_aout->pf_pause = NULL;
166 p_aout->pf_flush = NULL;
169 psz_format = var_CreateGetString( p_this, "audiofile-format" );
171 while ( *ppsz_compare != NULL )
173 if ( !strncmp( *ppsz_compare, psz_format, strlen(*ppsz_compare) ) )
180 if ( *ppsz_compare == NULL )
182 msg_Err( p_aout, "cannot understand the format string (%s)",
184 if( p_aout->sys->p_file != stdout )
185 fclose( p_aout->sys->p_file );
192 p_aout->format.i_format = format_int[i];
193 if ( AOUT_FMT_NON_LINEAR( &p_aout->format ) )
195 p_aout->format.i_bytes_per_frame = AOUT_SPDIF_SIZE;
196 p_aout->format.i_frame_length = A52_FRAME_NB;
197 aout_VolumeNoneInit( p_aout );
200 aout_VolumeSoftInit( p_aout );
202 /* Channels number */
203 i_channels = var_CreateGetInteger( p_this, "audiofile-channels" );
205 if( i_channels > 0 && i_channels <= CHANNELS_MAX )
207 p_aout->format.i_physical_channels =
208 pi_channels_maps[i_channels];
212 p_aout->sys->b_add_wav_header = var_CreateGetBool( p_this,
215 if( p_aout->sys->b_add_wav_header )
217 /* Write wave header */
218 WAVEHEADER *wh = &p_aout->sys->waveh;
220 memset( wh, 0, sizeof(*wh) );
222 switch( p_aout->format.i_format )
225 wh->Format = WAVE_FORMAT_IEEE_FLOAT;
226 wh->BitsPerSample = sizeof(float) * 8;
229 wh->Format = WAVE_FORMAT_PCM;
230 wh->BitsPerSample = 8;
234 wh->Format = WAVE_FORMAT_PCM;
235 wh->BitsPerSample = 16;
239 wh->MainChunkID = VLC_FOURCC('R', 'I', 'F', 'F');
240 wh->Length = 0; /* temp, to be filled in as we go */
241 wh->ChunkTypeID = VLC_FOURCC('W', 'A', 'V', 'E');
242 wh->SubChunkID = VLC_FOURCC('f', 'm', 't', ' ');
243 wh->SubChunkLength = 16;
245 wh->Modus = aout_FormatNbChannels( &p_aout->format );
246 wh->SampleFreq = p_aout->format.i_rate;
247 wh->BytesPerSample = wh->Modus * ( wh->BitsPerSample / 8 );
248 wh->BytesPerSec = wh->BytesPerSample * wh->SampleFreq;
250 wh->DataChunkID = VLC_FOURCC('d', 'a', 't', 'a');
251 wh->DataLength = 0; /* temp, to be filled in as we go */
253 /* Header -> little endian format */
254 SetWLE( &wh->Format, wh->Format );
255 SetWLE( &wh->BitsPerSample, wh->BitsPerSample );
256 SetDWLE( &wh->SubChunkLength, wh->SubChunkLength );
257 SetWLE( &wh->Modus, wh->Modus );
258 SetDWLE( &wh->SampleFreq, wh->SampleFreq );
259 SetWLE( &wh->BytesPerSample, wh->BytesPerSample );
260 SetDWLE( &wh->BytesPerSec, wh->BytesPerSec );
262 if( fwrite( wh, sizeof(WAVEHEADER), 1,
263 p_aout->sys->p_file ) != 1 )
265 msg_Err( p_aout, "write error (%m)" );
272 /*****************************************************************************
273 * Close: close our file
274 *****************************************************************************/
275 static void Close( vlc_object_t * p_this )
277 audio_output_t * p_aout = (audio_output_t *)p_this;
279 msg_Dbg( p_aout, "closing audio file" );
281 if( p_aout->sys->b_add_wav_header )
283 /* Update Wave Header */
284 p_aout->sys->waveh.Length =
285 p_aout->sys->waveh.DataLength + sizeof(WAVEHEADER) - 4;
287 /* Write Wave Header */
288 if( fseek( p_aout->sys->p_file, 0, SEEK_SET ) )
290 msg_Err( p_aout, "seek error (%m)" );
293 /* Header -> little endian format */
294 SetDWLE( &p_aout->sys->waveh.Length,
295 p_aout->sys->waveh.Length );
296 SetDWLE( &p_aout->sys->waveh.DataLength,
297 p_aout->sys->waveh.DataLength );
299 if( fwrite( &p_aout->sys->waveh, sizeof(WAVEHEADER), 1,
300 p_aout->sys->p_file ) != 1 )
302 msg_Err( p_aout, "write error (%m)" );
306 if( p_aout->sys->p_file != stdout )
307 fclose( p_aout->sys->p_file );
311 /*****************************************************************************
312 * Play: pretend to play a sound
313 *****************************************************************************/
314 static void Play( audio_output_t * p_aout, block_t *p_buffer )
316 if( fwrite( p_buffer->p_buffer, p_buffer->i_buffer, 1,
317 p_aout->sys->p_file ) != 1 )
319 msg_Err( p_aout, "write error (%m)" );
322 if( p_aout->sys->b_add_wav_header )
324 /* Update Wave Header */
325 p_aout->sys->waveh.DataLength += p_buffer->i_buffer;
328 aout_BufferFree( p_buffer );