/***************************************************************************** * rawaud.c : raw audio input module for vlc ***************************************************************************** * Copyright (C) 2009 VLC authors and VideoLAN * $Id$ * * Authors: Jarmo Torvinen * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include /***************************************************************************** * Module descriptor *****************************************************************************/ static int Open ( vlc_object_t * ); static void Close( vlc_object_t * ); #define SAMPLERATE_TEXT N_("Audio samplerate (Hz)") #define SAMPLERATE_LONGTEXT N_("Audio sample rate in Hertz. Default is 48000 Hz.") #define CHANNELS_TEXT N_("Audio channels") #define CHANNELS_LONGTEXT N_("Audio channels in input stream. Numeric value >0. Default is 2.") #define FOURCC_TEXT N_("FOURCC code of raw input format") #define FOURCC_LONGTEXT N_( \ "FOURCC code of the raw input format. This is a four character string." ) #define LANG_TEXT N_("Forces the audio language") #define LANG_LONGTEXT N_("Forces the audio language for the output mux. Three letter ISO639 code. Default is 'eng'.") #ifdef WORDS_BIGENDIAN # define FOURCC_DEFAULT "s16b" #else # define FOURCC_DEFAULT "s16l" #endif vlc_module_begin(); set_shortname( "Raw Audio" ); set_description( N_("Raw audio demuxer") ); set_capability( "demux", 0 ); set_category( CAT_INPUT ); set_subcategory( SUBCAT_INPUT_DEMUX ); set_callbacks( Open, Close ); add_shortcut( "rawaud" ); add_integer( "rawaud-channels", 2, CHANNELS_TEXT, CHANNELS_LONGTEXT, false ); change_safe() add_integer( "rawaud-samplerate", 48000, SAMPLERATE_TEXT, SAMPLERATE_LONGTEXT, false ); change_safe() add_string( "rawaud-fourcc", FOURCC_DEFAULT, FOURCC_TEXT, FOURCC_LONGTEXT, false ); change_safe() add_string( "rawaud-lang", "eng", LANG_TEXT, LANG_LONGTEXT, false); vlc_module_end(); /***************************************************************************** * Definitions of structures used by this plugin *****************************************************************************/ struct demux_sys_t { es_out_id_t *p_es; es_format_t fmt; unsigned int i_frame_size; unsigned int i_frame_samples; unsigned int i_seek_step; date_t pts; }; /***************************************************************************** * Local prototypes *****************************************************************************/ static int Demux( demux_t * ); static int Control( demux_t *, int i_query, va_list args ); /***************************************************************************** * Open: initializes raw audio demuxer *****************************************************************************/ static int Open( vlc_object_t * p_this ) { demux_t *p_demux = (demux_t*)p_this; demux_sys_t *p_sys; p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) ); if( !p_sys ) return VLC_ENOMEM; char *psz_fourcc = var_CreateGetString( p_demux, "rawaud-fourcc" ); es_format_Init( &p_sys->fmt, AUDIO_ES, vlc_fourcc_GetCodecFromString( AUDIO_ES, psz_fourcc ) ); free( psz_fourcc ); if( !p_sys->fmt.i_codec ) { msg_Err( p_demux, "rawaud-fourcc must be a 4 character string"); es_format_Clean( &p_sys->fmt ); free( p_sys ); return VLC_EGENERIC; } // get the bits per sample ratio based on codec switch( p_sys->fmt.i_codec ) { case VLC_CODEC_FL64: p_sys->fmt.audio.i_bitspersample = 64; break; case VLC_CODEC_FL32: case VLC_CODEC_S32L: case VLC_CODEC_S32B: p_sys->fmt.audio.i_bitspersample = 32; break; case VLC_CODEC_S24L: case VLC_CODEC_S24B: p_sys->fmt.audio.i_bitspersample = 24; break; case VLC_CODEC_S16L: case VLC_CODEC_S16B: p_sys->fmt.audio.i_bitspersample = 16; break; case VLC_CODEC_S8: case VLC_CODEC_U8: p_sys->fmt.audio.i_bitspersample = 8; break; default: msg_Err( p_demux, "unknown fourcc format %4.4s", (char *)&p_sys->fmt.i_codec); es_format_Clean( &p_sys->fmt ); free( p_sys ); return VLC_EGENERIC; } p_sys->fmt.psz_language = var_CreateGetString( p_demux, "rawaud-lang" ); p_sys->fmt.audio.i_channels = var_CreateGetInteger( p_demux, "rawaud-channels" ); p_sys->fmt.audio.i_rate = var_CreateGetInteger( p_demux, "rawaud-samplerate" ); if( p_sys->fmt.audio.i_rate == 0 || p_sys->fmt.audio.i_rate > 384000 ) { msg_Err( p_demux, "invalid sample rate"); es_format_Clean( &p_sys->fmt ); free( p_sys ); return VLC_EGENERIC; } if( p_sys->fmt.audio.i_channels == 0 || p_sys->fmt.audio.i_channels > 32 ) { msg_Err( p_demux, "invalid number of channels"); es_format_Clean( &p_sys->fmt ); free( p_sys ); return VLC_EGENERIC; } p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate * p_sys->fmt.audio.i_channels * p_sys->fmt.audio.i_bitspersample; if( p_sys->fmt.i_bitrate > 50000000) { msg_Err( p_demux, "invalid bitrate"); es_format_Clean( &p_sys->fmt ); free( p_sys ); return VLC_EGENERIC; } msg_Dbg( p_demux, "format initialized: channels=%d , samplerate=%d Hz, fourcc=%4.4s, bits per sample = %d, bitrate = %d bit/s", p_sys->fmt.audio.i_channels, p_sys->fmt.audio.i_rate, (char*)&p_sys->fmt.i_codec, p_sys->fmt.audio.i_bitspersample, p_sys->fmt.i_bitrate); /* add the es */ p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt ); msg_Dbg( p_demux, "elementary stream added"); /* initialize timing */ date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 ); date_Set( &p_sys->pts, 0 ); /* calculate 50ms frame size/time */ p_sys->i_frame_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 ); p_sys->i_seek_step = p_sys->fmt.audio.i_channels * ( (p_sys->fmt.audio.i_bitspersample + 7) / 8 ); p_sys->i_frame_size = p_sys->i_frame_samples * p_sys->i_seek_step; msg_Dbg( p_demux, "frame size is %d bytes ", p_sys->i_frame_size); p_demux->pf_demux = Demux; p_demux->pf_control = Control; return VLC_SUCCESS; } /***************************************************************************** * Close: frees unused data *****************************************************************************/ static void Close( vlc_object_t *p_this ) { demux_t *p_demux = (demux_t*)p_this; demux_sys_t *p_sys = p_demux->p_sys; es_format_Clean( &p_sys->fmt ); free( p_sys ); } /***************************************************************************** * Demux: reads and demuxes data packets ***************************************************************************** * Returns -1 in case of error, 0 in case of EOF, 1 otherwise *****************************************************************************/ static int Demux( demux_t *p_demux ) { demux_sys_t *p_sys = p_demux->p_sys; block_t *p_block; p_block = vlc_stream_Block( p_demux->s, p_sys->i_frame_size ); if( p_block == NULL ) { /* EOF */ return 0; } p_block->i_dts = p_block->i_pts = VLC_TICK_0 + date_Get( &p_sys->pts ); es_out_SetPCR( p_demux->out, p_block->i_pts ); es_out_Send( p_demux->out, p_sys->p_es, p_block ); date_Increment( &p_sys->pts, p_sys->i_frame_samples ); return 1; } /***************************************************************************** * Control: *****************************************************************************/ static int Control( demux_t *p_demux, int i_query, va_list args ) { demux_sys_t *p_sys = p_demux->p_sys; return demux_vaControlHelper( p_demux->s, 0, -1, p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args ); }