/***************************************************************************** * mixer.c : audio output mixing operations ***************************************************************************** * Copyright (C) 2002-2004 the VideoLAN team * $Id$ * * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #ifdef HAVE_ALLOCA_H # include #endif #include #include "aout_internal.h" /***************************************************************************** * aout_MixerNew: prepare a mixer plug-in ***************************************************************************** * Please note that you must hold the mixer lock. *****************************************************************************/ int aout_MixerNew( aout_instance_t * p_aout ) { p_aout->mixer.p_module = module_Need( p_aout, "audio mixer", NULL, 0 ); if ( p_aout->mixer.p_module == NULL ) { msg_Err( p_aout, "no suitable audio mixer" ); return -1; } p_aout->mixer.b_error = 0; return 0; } /***************************************************************************** * aout_MixerDelete: delete the mixer ***************************************************************************** * Please note that you must hold the mixer lock. *****************************************************************************/ void aout_MixerDelete( aout_instance_t * p_aout ) { if ( p_aout->mixer.b_error ) return; module_Unneed( p_aout, p_aout->mixer.p_module ); p_aout->mixer.b_error = 1; } /***************************************************************************** * MixBuffer: try to prepare one output buffer ***************************************************************************** * Please note that you must hold the mixer lock. *****************************************************************************/ static int MixBuffer( aout_instance_t * p_aout ) { int i, i_first_input = 0; aout_buffer_t * p_output_buffer; mtime_t start_date, end_date; audio_date_t exact_start_date; if ( p_aout->mixer.b_error ) { /* Free all incoming buffers. */ aout_lock_input_fifos( p_aout ); for ( i = 0; i < p_aout->i_nb_inputs; i++ ) { aout_input_t * p_input = p_aout->pp_inputs[i]; aout_buffer_t * p_buffer = p_input->fifo.p_first; if ( p_input->b_error ) continue; while ( p_buffer != NULL ) { aout_buffer_t * p_next = p_buffer->p_next; aout_BufferFree( p_buffer ); p_buffer = p_next; } } aout_unlock_input_fifos( p_aout ); return -1; } aout_lock_output_fifo( p_aout ); aout_lock_input_fifos( p_aout ); /* Retrieve the date of the next buffer. */ memcpy( &exact_start_date, &p_aout->output.fifo.end_date, sizeof(audio_date_t) ); start_date = aout_DateGet( &exact_start_date ); if ( start_date != 0 && start_date < mdate() ) { /* The output is _very_ late. This can only happen if the user * pauses the stream (or if the decoder is buggy, which cannot * happen :). */ msg_Warn( p_aout, "output PTS is out of range (%"PRId64"), clearing out", mdate() - start_date ); aout_FifoSet( p_aout, &p_aout->output.fifo, 0 ); aout_DateSet( &exact_start_date, 0 ); start_date = 0; } aout_unlock_output_fifo( p_aout ); /* See if we have enough data to prepare a new buffer for the audio * output. First : start date. */ if ( !start_date ) { /* Find the latest start date available. */ for ( i = 0; i < p_aout->i_nb_inputs; i++ ) { aout_input_t * p_input = p_aout->pp_inputs[i]; aout_fifo_t * p_fifo = &p_input->fifo; aout_buffer_t * p_buffer; if ( p_input->b_error ) continue; p_buffer = p_fifo->p_first; while ( p_buffer != NULL && p_buffer->start_date < mdate() ) { msg_Warn( p_aout, "input PTS is out of range (%"PRId64"), " "trashing", mdate() - p_buffer->start_date ); p_buffer = aout_FifoPop( p_aout, p_fifo ); aout_BufferFree( p_buffer ); if( p_input->p_input_thread ) { // stats_UpdateInteger( p_input->p_input_thread, // "lost_abuffers", 1 ); } p_buffer = p_fifo->p_first; p_input->p_first_byte_to_mix = NULL; } if ( p_buffer == NULL ) { break; } if ( !start_date || start_date < p_buffer->start_date ) { aout_DateSet( &exact_start_date, p_buffer->start_date ); start_date = p_buffer->start_date; } } if ( i < p_aout->i_nb_inputs ) { /* Interrupted before the end... We can't run. */ aout_unlock_input_fifos( p_aout ); return -1; } } aout_DateIncrement( &exact_start_date, p_aout->output.i_nb_samples ); end_date = aout_DateGet( &exact_start_date ); /* Check that start_date and end_date are available for all input * streams. */ for ( i = 0; i < p_aout->i_nb_inputs; i++ ) { aout_input_t * p_input = p_aout->pp_inputs[i]; aout_fifo_t * p_fifo = &p_input->fifo; aout_buffer_t * p_buffer; mtime_t prev_date; bool b_drop_buffers; if ( p_input->b_error ) { if ( i_first_input == i ) i_first_input++; continue; } p_buffer = p_fifo->p_first; if ( p_buffer == NULL ) { break; } /* Check for the continuity of start_date */ while ( p_buffer != NULL && p_buffer->end_date < start_date - 1 ) { /* We authorize a +-1 because rounding errors get compensated * regularly. */ aout_buffer_t * p_next = p_buffer->p_next; msg_Warn( p_aout, "the mixer got a packet in the past (%"PRId64")", start_date - p_buffer->end_date ); aout_BufferFree( p_buffer ); if( p_input->p_input_thread ) { // stats_UpdateInteger( p_input->p_input_thread, // "lost_abuffers", 1 ); } p_fifo->p_first = p_buffer = p_next; p_input->p_first_byte_to_mix = NULL; } if ( p_buffer == NULL ) { p_fifo->pp_last = &p_fifo->p_first; break; } /* Check that we have enough samples. */ for ( ; ; ) { p_buffer = p_fifo->p_first; if ( p_buffer == NULL ) break; if ( p_buffer->end_date >= end_date ) break; /* Check that all buffers are contiguous. */ prev_date = p_fifo->p_first->end_date; p_buffer = p_buffer->p_next; b_drop_buffers = 0; for ( ; p_buffer != NULL; p_buffer = p_buffer->p_next ) { if ( prev_date != p_buffer->start_date ) { msg_Warn( p_aout, "buffer hole, dropping packets (%"PRId64")", p_buffer->start_date - prev_date ); b_drop_buffers = 1; break; } if ( p_buffer->end_date >= end_date ) break; prev_date = p_buffer->end_date; } if ( b_drop_buffers ) { aout_buffer_t * p_deleted = p_fifo->p_first; while ( p_deleted != NULL && p_deleted != p_buffer ) { aout_buffer_t * p_next = p_deleted->p_next; aout_BufferFree( p_deleted ); p_deleted = p_next; } p_fifo->p_first = p_deleted; /* == p_buffer */ } else break; } if ( p_buffer == NULL ) break; p_buffer = p_fifo->p_first; if ( !AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) ) { /* Additionally check that p_first_byte_to_mix is well * located. */ mtime_t i_nb_bytes = (start_date - p_buffer->start_date) * p_aout->mixer.mixer.i_bytes_per_frame * p_aout->mixer.mixer.i_rate / p_aout->mixer.mixer.i_frame_length / 1000000; ptrdiff_t mixer_nb_bytes; if ( p_input->p_first_byte_to_mix == NULL ) { p_input->p_first_byte_to_mix = p_buffer->p_buffer; } mixer_nb_bytes = p_input->p_first_byte_to_mix - p_buffer->p_buffer; if ( !((i_nb_bytes + p_aout->mixer.mixer.i_bytes_per_frame > mixer_nb_bytes) && (i_nb_bytes < p_aout->mixer.mixer.i_bytes_per_frame + mixer_nb_bytes)) ) { msg_Warn( p_aout, "mixer start isn't output start (%"PRId64")", i_nb_bytes - mixer_nb_bytes ); /* Round to the nearest multiple */ i_nb_bytes /= p_aout->mixer.mixer.i_bytes_per_frame; i_nb_bytes *= p_aout->mixer.mixer.i_bytes_per_frame; if( i_nb_bytes < 0 ) { /* Is it really the best way to do it ? */ aout_lock_output_fifo( p_aout ); aout_FifoSet( p_aout, &p_aout->output.fifo, 0 ); aout_DateSet( &exact_start_date, 0 ); aout_unlock_output_fifo( p_aout ); break; } p_input->p_first_byte_to_mix = p_buffer->p_buffer + i_nb_bytes; } } } if ( i < p_aout->i_nb_inputs || i_first_input == p_aout->i_nb_inputs ) { /* Interrupted before the end... We can't run. */ aout_unlock_input_fifos( p_aout ); return -1; } /* Run the mixer. */ aout_BufferAlloc( &p_aout->mixer.output_alloc, ((uint64_t)p_aout->output.i_nb_samples * 1000000) / p_aout->output.output.i_rate, /* This is a bit kludgy, but is actually only used * for the S/PDIF dummy mixer : */ p_aout->pp_inputs[i_first_input]->fifo.p_first, p_output_buffer ); if ( p_output_buffer == NULL ) { aout_unlock_input_fifos( p_aout ); return -1; } /* This is again a bit kludgy - for the S/PDIF mixer. */ if ( p_aout->mixer.output_alloc.i_alloc_type != AOUT_ALLOC_NONE ) { p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples; p_output_buffer->i_nb_bytes = p_aout->output.i_nb_samples * p_aout->mixer.mixer.i_bytes_per_frame / p_aout->mixer.mixer.i_frame_length; } p_output_buffer->start_date = start_date; p_output_buffer->end_date = end_date; p_aout->mixer.pf_do_work( p_aout, p_output_buffer ); aout_unlock_input_fifos( p_aout ); aout_OutputPlay( p_aout, p_output_buffer ); return 0; } /***************************************************************************** * aout_MixerRun: entry point for the mixer & post-filters processing ***************************************************************************** * Please note that you must hold the mixer lock. *****************************************************************************/ void aout_MixerRun( aout_instance_t * p_aout ) { while( MixBuffer( p_aout ) != -1 ); } /***************************************************************************** * aout_MixerMultiplierSet: set p_aout->mixer.f_multiplier ***************************************************************************** * Please note that we assume that you own the mixer lock when entering this * function. This function returns -1 on error. *****************************************************************************/ int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier ) { float f_old = p_aout->mixer.f_multiplier; bool b_new_mixer = 0; if ( !p_aout->mixer.b_error ) { aout_MixerDelete( p_aout ); b_new_mixer = 1; } p_aout->mixer.f_multiplier = f_multiplier; if ( b_new_mixer && aout_MixerNew( p_aout ) ) { p_aout->mixer.f_multiplier = f_old; aout_MixerNew( p_aout ); return -1; } return 0; } /***************************************************************************** * aout_MixerMultiplierGet: get p_aout->mixer.f_multiplier ***************************************************************************** * Please note that we assume that you own the mixer lock when entering this * function. This function returns -1 on error. *****************************************************************************/ int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier ) { *pf_multiplier = p_aout->mixer.f_multiplier; return 0; }