/***************************************************************************** * decoder.c: AAC decoder using libfaad2 ***************************************************************************** * Copyright (C) 2001, 2003 VideoLAN * $Id: faad.c,v 1.8 2003/12/12 23:15:40 gbazin Exp $ * * Authors: Laurent Aimar * Gildas Bazin * * 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. *****************************************************************************/ #include #include #include #include /***************************************************************************** * Module descriptor *****************************************************************************/ static int Open( vlc_object_t * ); static void Close( vlc_object_t * ); vlc_module_begin(); set_description( _("AAC audio decoder (using libfaad2)") ); set_capability( "decoder", 100 ); set_callbacks( Open, Close ); vlc_module_end(); /**************************************************************************** * Local prototypes ****************************************************************************/ static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** ); static void DoReordering( decoder_t *, uint32_t *, uint32_t *, int, int, uint32_t * ); #define MAX_CHANNEL_POSITIONS 9 struct decoder_sys_t { /* faad handler */ faacDecHandle *hfaad; /* samples */ audio_date_t date; /* temporary buffer */ uint8_t *p_buffer; int i_buffer; int i_buffer_size; /* Channel positions of the current stream (for re-ordering) */ uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS]; }; static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] = { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT, SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT, BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT, BACK_CHANNEL_CENTER, LFE_CHANNEL }; static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] = { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE }; static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE }; /***************************************************************************** * OpenDecoder: probe the decoder and return score *****************************************************************************/ static int Open( vlc_object_t *p_this ) { decoder_t *p_dec = (decoder_t*)p_this; decoder_sys_t *p_sys = p_dec->p_sys; faacDecConfiguration *cfg; if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') ) { return VLC_EGENERIC; } /* Allocate the memory needed to store the decoder's structure */ if( ( p_dec->p_sys = p_sys = (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL ) { msg_Err( p_dec, "out of memory" ); return VLC_EGENERIC; } /* Open a faad context */ if( ( p_sys->hfaad = faacDecOpen() ) == NULL ) { msg_Err( p_dec, "Cannot initialize faad" ); return VLC_EGENERIC; } /* Misc init */ aout_DateSet( &p_sys->date, 0 ); p_dec->fmt_out.i_cat = AUDIO_ES; p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2'); p_dec->pf_decode_audio = DecodeBlock; p_dec->fmt_out.audio.i_physical_channels = p_dec->fmt_out.audio.i_original_channels = 0; if( p_dec->fmt_in.i_extra > 0 ) { /* We have a decoder config so init the handle */ unsigned long i_rate; unsigned char i_channels; if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra, &i_rate, &i_channels ) < 0 ) { return VLC_EGENERIC; } p_dec->fmt_out.audio.i_rate = i_rate; p_dec->fmt_out.audio.i_channels = i_channels; aout_DateInit( &p_sys->date, i_rate ); } else { /* Will be initalised from first frame */ p_dec->fmt_out.audio.i_rate = 0; p_dec->fmt_out.audio.i_channels = 0; } /* Set the faad config */ cfg = faacDecGetCurrentConfiguration( p_sys->hfaad ); cfg->outputFormat = FAAD_FMT_FLOAT; faacDecSetConfiguration( p_sys->hfaad, cfg ); /* buffer */ p_sys->i_buffer = p_sys->i_buffer_size = 0; p_sys->p_buffer = 0; return VLC_SUCCESS; } /***************************************************************************** * DecodeBlock: *****************************************************************************/ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block ) { decoder_sys_t *p_sys = p_dec->p_sys; block_t *p_block; if( !pp_block || !*pp_block ) return NULL; p_block = *pp_block; if( p_block->b_discontinuity ) { block_Release( p_block ); return NULL; } /* Append the block to the temporary buffer */ if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer ) { p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer; p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size ); } if( p_block->i_buffer ) { memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer, p_block->i_buffer ); p_sys->i_buffer += p_block->i_buffer; p_block->i_buffer = 0; } if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer ) { unsigned long i_rate; unsigned char i_channels; /* Init faad with the first frame */ if( faacDecInit( p_sys->hfaad, p_sys->p_buffer, p_sys->i_buffer, &i_rate, &i_channels ) < 0 ) { block_Release( p_block ); return NULL; } p_dec->fmt_out.audio.i_rate = i_rate; p_dec->fmt_out.audio.i_channels = i_channels; aout_DateInit( &p_sys->date, i_rate ); } if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) ) { aout_DateSet( &p_sys->date, p_block->i_pts ); } else if( !aout_DateGet( &p_sys->date ) ) { /* We've just started the stream, wait for the first PTS. */ block_Release( p_block ); p_sys->i_buffer = 0; return NULL; } /* Decode all data */ if( p_sys->i_buffer ) { void *samples; faacDecFrameInfo frame; aout_buffer_t *p_out; int i, j; samples = faacDecDecode( p_sys->hfaad, &frame, p_sys->p_buffer, p_sys->i_buffer ); if( frame.error > 0 ) { msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) ); /* Flush the buffer */ p_sys->i_buffer = 0; block_Release( p_block ); return NULL; } if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 ) { msg_Warn( p_dec, "invalid channels count: %i", frame.channels ); /* Flush the buffer */ p_sys->i_buffer -= frame.bytesconsumed; if( p_sys->i_buffer > 0 ) { memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed], p_sys->i_buffer ); } block_Release( p_block ); return NULL; } if( frame.samples <= 0 ) { msg_Warn( p_dec, "decoded zero samples" ); /* Flush the buffer */ p_sys->i_buffer -= frame.bytesconsumed; if( p_sys->i_buffer > 0 ) { memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed], p_sys->i_buffer ); } block_Release( p_block ); return NULL; } /* We decoded a valid frame */ if( p_dec->fmt_out.audio.i_rate != frame.samplerate ) { aout_DateInit( &p_sys->date, frame.samplerate ); aout_DateSet( &p_sys->date, p_block->i_pts ); } p_block->i_pts = 0; /* PTS is valid only once */ p_dec->fmt_out.audio.i_rate = frame.samplerate; p_dec->fmt_out.audio.i_channels = frame.channels; /* Convert frame.channel_position to our own channel values */ for( i = 0; i < frame.channels; i++ ) { /* Find the channel code */ for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ ) { if( frame.channel_position[i] == pi_channels_in[j] ) { p_sys->pi_channel_positions[i] = pi_channels_out[j]; p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j]; break; } } } p_dec->fmt_out.audio.i_original_channels = p_dec->fmt_out.audio.i_physical_channels; p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels); if( p_out == NULL ) { p_sys->i_buffer = 0; block_Release( p_block ); return NULL; } p_out->start_date = aout_DateGet( &p_sys->date ); p_out->end_date = aout_DateIncrement( &p_sys->date, frame.samples / frame.channels ); DoReordering( p_dec, (uint32_t *)p_out->p_buffer, samples, frame.samples / frame.channels, frame.channels, p_sys->pi_channel_positions ); p_sys->i_buffer -= frame.bytesconsumed; if( p_sys->i_buffer > 0 ) { memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed], p_sys->i_buffer ); } return p_out; } block_Release( p_block ); return NULL; } /***************************************************************************** * Close: *****************************************************************************/ static void Close( vlc_object_t *p_this ) { decoder_t *p_dec = (decoder_t *)p_this; decoder_sys_t *p_sys = p_dec->p_sys; faacDecClose( p_sys->hfaad ); free( p_sys ); } /***************************************************************************** * DoReordering: do some channel re-ordering (the ac3 channel order is * different from the aac one). *****************************************************************************/ static void DoReordering( decoder_t *p_dec, uint32_t *p_out, uint32_t *p_in, int i_samples, int i_nb_channels, uint32_t *pi_chan_positions ) { int pi_chan_table[MAX_CHANNEL_POSITIONS]; int i, j, k; /* Find the channels mapping */ for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ ) { for( k = 0; k < i_nb_channels; k++ ) { if( pi_channels_ordered[i] == pi_chan_positions[k] ) { pi_chan_table[k] = j++; break; } } } /* Do the actual reordering */ for( i = 0; i < i_samples; i++ ) { for( j = 0; j < i_nb_channels; j++ ) { p_out[i * i_nb_channels + pi_chan_table[j]] = p_in[i * i_nb_channels + j]; } } }