/***************************************************************************** * output.c : internal management of output streams for the audio output ***************************************************************************** * Copyright (C) 2002 VideoLAN * $Id: output.c,v 1.35 2003/01/28 12:23:40 massiot Exp $ * * Authors: Christophe Massiot * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #include /* calloc(), malloc(), free() */ #include #include #include "audio_output.h" #include "aout_internal.h" /***************************************************************************** * aout_OutputNew : allocate a new output and rework the filter pipeline ***************************************************************************** * This function is entered with the mixer lock. *****************************************************************************/ int aout_OutputNew( aout_instance_t * p_aout, audio_sample_format_t * p_format ) { /* Retrieve user defaults. */ char * psz_name = config_GetPsz( p_aout, "aout" ); int i_rate = config_GetInt( p_aout, "aout-rate" ); vlc_value_t val; memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) ); if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate; aout_FormatPrepare( &p_aout->output.output ); vlc_mutex_lock( &p_aout->output_fifo_lock ); /* Find the best output plug-in. */ p_aout->output.p_module = module_Need( p_aout, "audio output", psz_name ); if ( psz_name != NULL ) free( psz_name ); if ( p_aout->output.p_module == NULL ) { msg_Err( p_aout, "no suitable aout module" ); vlc_mutex_unlock( &p_aout->output_fifo_lock ); return -1; } if ( var_Type( p_aout, "audio-channels" ) == (VLC_VAR_STRING | VLC_VAR_HASCHOICE) ) { /* The user may have selected a different channels configuration. */ var_Get( p_aout, "audio-channels", &val ); if ( !strcmp( val.psz_string, N_("Reverse stereo") ) ) { p_aout->output.output.i_original_channels |= AOUT_CHAN_REVERSESTEREO; } else if ( !strcmp( val.psz_string, N_("Both") ) ) { p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT; } else if ( !strcmp( val.psz_string, N_("Left") ) ) { p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT; } else if ( !strcmp( val.psz_string, N_("Right") ) ) { p_aout->output.output.i_original_channels = AOUT_CHAN_RIGHT; } else if ( !strcmp( val.psz_string, N_("Dolby Surround") ) ) { p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_DOLBYSTEREO; } free( val.psz_string ); } else if ( p_aout->output.output.i_physical_channels == AOUT_CHAN_CENTER && (p_aout->output.output.i_original_channels & AOUT_CHAN_PHYSMASK) == (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) ) { /* Mono - create the audio-channels variable. */ var_Create( p_aout, "audio-channels", VLC_VAR_STRING | VLC_VAR_HASCHOICE ); val.psz_string = N_("Both"); var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val ); val.psz_string = N_("Left"); var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val ); val.psz_string = N_("Right"); var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val ); if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO ) { /* Go directly to the left channel. */ p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT; val.psz_string = N_("Left"); var_Set( p_aout, "audio-channels", val ); } var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart, NULL ); } else if ( p_aout->output.output.i_physical_channels == (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) && (p_aout->output.output.i_original_channels & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) ) { /* Stereo - create the audio-channels variable. */ var_Create( p_aout, "audio-channels", VLC_VAR_STRING | VLC_VAR_HASCHOICE ); if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DOLBYSTEREO ) { val.psz_string = N_("Dolby Surround"); } else { val.psz_string = N_("Both"); } var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val ); val.psz_string = N_("Left"); var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val ); val.psz_string = N_("Right"); var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val ); val.psz_string = N_("Reverse stereo"); var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val ); if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO ) { /* Go directly to the left channel. */ p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT; val.psz_string = N_("Left"); var_Set( p_aout, "audio-channels", val ); } var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart, NULL ); } val.b_bool = VLC_TRUE; var_Set( p_aout, "intf-change", val ); aout_FormatPrepare( &p_aout->output.output ); /* Prepare FIFO. */ aout_FifoInit( p_aout, &p_aout->output.fifo, p_aout->output.output.i_rate ); vlc_mutex_unlock( &p_aout->output_fifo_lock ); aout_FormatPrint( p_aout, "output", &p_aout->output.output ); /* Calculate the resulting mixer output format. */ memcpy( &p_aout->mixer.mixer, &p_aout->output.output, sizeof(audio_sample_format_t) ); if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) ) { /* Non-S/PDIF mixer only deals with float32 or fixed32. */ p_aout->mixer.mixer.i_format = (p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU) ? VLC_FOURCC('f','l','3','2') : VLC_FOURCC('f','i','3','2'); aout_FormatPrepare( &p_aout->mixer.mixer ); } else { p_aout->mixer.mixer.i_format = p_format->i_format; } aout_FormatPrint( p_aout, "mixer", &p_aout->output.output ); /* Create filters. */ if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters, &p_aout->output.i_nb_filters, &p_aout->mixer.mixer, &p_aout->output.output ) < 0 ) { msg_Err( p_aout, "couldn't set an output pipeline" ); module_Unneed( p_aout, p_aout->output.p_module ); return -1; } /* Prepare hints for the buffer allocator. */ p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP; p_aout->mixer.output_alloc.i_bytes_per_sec = p_aout->mixer.mixer.i_bytes_per_frame * p_aout->mixer.mixer.i_rate / p_aout->mixer.mixer.i_frame_length; aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters, p_aout->output.i_nb_filters, &p_aout->mixer.output_alloc ); p_aout->output.b_error = 0; return 0; } /***************************************************************************** * aout_OutputDelete : delete the output ***************************************************************************** * This function is entered with the mixer lock. *****************************************************************************/ void aout_OutputDelete( aout_instance_t * p_aout ) { if ( p_aout->output.b_error ) { return; } module_Unneed( p_aout, p_aout->output.p_module ); aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters, p_aout->output.i_nb_filters ); aout_FifoDestroy( p_aout, &p_aout->output.fifo ); p_aout->output.b_error = VLC_TRUE; } /***************************************************************************** * aout_OutputPlay : play a buffer ***************************************************************************** * This function is entered with the mixer lock. *****************************************************************************/ void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer ) { aout_FiltersPlay( p_aout, p_aout->output.pp_filters, p_aout->output.i_nb_filters, &p_buffer ); vlc_mutex_lock( &p_aout->output_fifo_lock ); aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer ); p_aout->output.pf_play( p_aout ); vlc_mutex_unlock( &p_aout->output_fifo_lock ); } /***************************************************************************** * aout_OutputNextBuffer : give the audio output plug-in the right buffer ***************************************************************************** * If b_can_sleek is 1, the aout core functions won't try to resample * new buffers to catch up - that is we suppose that the output plug-in can * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1. * This function is entered with no lock at all :-). *****************************************************************************/ aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout, mtime_t start_date, vlc_bool_t b_can_sleek ) { aout_buffer_t * p_buffer; vlc_mutex_lock( &p_aout->output_fifo_lock ); p_buffer = p_aout->output.fifo.p_first; while ( p_buffer && p_buffer->start_date < mdate() ) { msg_Dbg( p_aout, "audio output is too slow ("I64Fd"), " "trashing "I64Fd"us", mdate() - p_buffer->start_date, p_buffer->end_date - p_buffer->start_date ); p_buffer = p_buffer->p_next; aout_BufferFree( p_aout->output.fifo.p_first ); p_aout->output.fifo.p_first = p_buffer; } if ( p_buffer == NULL ) { p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first; #if 0 /* This is bad because the audio output might just be trying to fill * in it's internal buffers. And anyway, it's up to the audio output * to deal with this kind of starvation. */ /* Set date to 0, to allow the mixer to send a new buffer ASAP */ aout_FifoSet( p_aout, &p_aout->output.fifo, 0 ); if ( !p_aout->output.b_starving ) msg_Dbg( p_aout, "audio output is starving (no input), playing silence" ); p_aout->output.b_starving = 1; #endif vlc_mutex_unlock( &p_aout->output_fifo_lock ); return NULL; } /* Here we suppose that all buffers have the same duration - this is * generally true, and anyway if it's wrong it won't be a disaster. */ if ( p_buffer->start_date > start_date + (p_buffer->end_date - p_buffer->start_date) ) { vlc_mutex_unlock( &p_aout->output_fifo_lock ); if ( !p_aout->output.b_starving ) msg_Dbg( p_aout, "audio output is starving ("I64Fd"), " "playing silence", p_buffer->start_date - start_date ); p_aout->output.b_starving = 1; return NULL; } p_aout->output.b_starving = 0; if ( !b_can_sleek && ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE) || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) ) { /* Try to compensate the drift by doing some resampling. */ int i; mtime_t difference = start_date - p_buffer->start_date; msg_Warn( p_aout, "output date isn't PTS date, requesting " "resampling ("I64Fd")", difference ); vlc_mutex_lock( &p_aout->input_fifos_lock ); for ( i = 0; i < p_aout->i_nb_inputs; i++ ) { aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo; aout_FifoMoveDates( p_aout, p_fifo, difference ); } aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference ); vlc_mutex_unlock( &p_aout->input_fifos_lock ); } p_aout->output.fifo.p_first = p_buffer->p_next; if ( p_buffer->p_next == NULL ) { p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first; } vlc_mutex_unlock( &p_aout->output_fifo_lock ); return p_buffer; }