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-rw-r--r--ac3dec/decode.c312
1 files changed, 0 insertions, 312 deletions
diff --git a/ac3dec/decode.c b/ac3dec/decode.c
deleted file mode 100644
index 1ff517c..0000000
--- a/ac3dec/decode.c
+++ /dev/null
@@ -1,312 +0,0 @@
-/*
- * decode.c
- *
- * Copyright (C) Aaron Holtzman - May 1999
- *
- * This file is part of ac3dec, a free Dolby AC-3 stream decoder.
- *
- * ac3dec 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, or (at your option)
- * any later version.
- *
- * ac3dec 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 GNU Make; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *------------------------------------------------------------
- *
- * Thomas Mirlacher <dent@cosy.sbg.ac.at>
- * added OMS support
- * 11 Jan 2001
- * Thomas Mirlacher <dent@cosy.sbg.ac.at>
- * faster error response using jmp functions
- *
- * 9 Aug 2001
- * Matjaz Thaler <matjaz.thaler@rd.iskraemeco.si>
- * Added support for DVB-s PCI card
- *
- * 24 Nov 2001
- * Andreas Schultz <aschultz@cs.uni-magdeburg.de>
- * Added ac3_buffersize()
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/time.h>
-
-#ifdef __OMS__
-#include <oms/oms.h>
-#include <oms/plugin/output_audio.h>
-#endif
-
-#include "ac3.h"
-#include "ac3_internal.h"
-#include "bitstream.h"
-#include "downmix.h"
-#include "srfft.h"
-#include "imdct.h"
-#include "exponent.h"
-#include "coeff.h"
-#include "bit_allocate.h"
-#include "parse.h"
-#include "crc.h"
-#include "stats.h"
-#include "rematrix.h"
-#include "sanity_check.h"
-#include "debug.h"
-#ifndef __OMS__
-//#include "audio_out.h"
-#endif
-//our global config structure
-ac3_config_t ac3_config;
-
-static audblk_t audblk;
-static bsi_t bsi;
-static syncinfo_t syncinfo;
-#ifndef __OMS__
-static uint32_t done_banner;
-#endif
-static uint32_t is_output_initialized = 0;
-
-//the floating point samples for one audblk
-static stream_samples_t samples;
-
-//the integer samples for the entire frame (with enough space for 2 ch out)
-//if this size change, be sure to change the size when muting
-static int16_t s16_samples[2 * 6 * 256] __attribute__ ((aligned(16)));
-
-// downmix stuff
-static float cmixlev_lut[4] = { 0.707, 0.595, 0.500, 0.707 };
-static float smixlev_lut[4] = { 0.707, 0.500, 0.0 , 0.500 };
-static dm_par_t dm_par;
-
-//Storage for the syncframe
-#define BUFFER_MAX_SIZE 4096
-static uint8_t buffer[BUFFER_MAX_SIZE];
-static uint32_t buffer_size = 0;;
-// for error handling
-jmp_buf error_jmp_mark;
-
-uint32_t ac3_buffersize()
-{
- return buffer_size;
-}
-
-static uint32_t decode_buffer_syncframe (syncinfo_t *syncinfo, uint8_t **start, uint8_t *end)
-{
- uint8_t *cur = *start;
- uint16_t syncword = syncinfo->syncword;
- uint32_t ret = 0;
-
- // Find an ac3 sync frame.
- while (syncword != 0x0b77) {
- if (cur >= end)
- goto done;
- syncword = (syncword << 8) + *cur++;
- }
-
- //need the next 3 bytes to decide how big the frame is
- while (buffer_size < 3) {
- if(cur >= end)
- goto done;
-
- buffer[buffer_size++] = *cur++;
- }
-
- parse_syncinfo (syncinfo,buffer);
- stats_print_syncinfo (syncinfo);
-
- while (buffer_size < syncinfo->frame_size * 2 - 2) {
- if(cur >= end)
- goto done;
-
- buffer[buffer_size++] = *cur++;
- }
-
-#if 0
- // Check the crc over the entire frame
- crc_init();
- crc_process_frame (buffer, syncinfo->frame_size * 2 - 2);
-
- if (!crc_validate()) {
- fprintf(stderr,"** CRC failed - skipping frame **\n");
- goto done;
- }
-#endif
-
- //if we got to this point, we found a valid ac3 frame to decode
-
- bitstream_init (buffer);
- //get rid of the syncinfo struct as we already parsed it
- bitstream_get (24);
-
- //reset the syncword for next time
- syncword = 0xffff;
- buffer_size = 0;
- ret = 1;
-
-done:
- syncinfo->syncword = syncword;
- *start = cur;
- return ret;
-}
-
-
-void inline decode_mute (void)
-{
- //mute the frame
- memset (s16_samples, 0, sizeof(int16_t) * 256 * 2 * 6);
-}
-
-
-void ac3dec_init (void)
-{
-// FIXME - don't do that statically here
- ac3_config.num_output_ch = 2;
- ac3_config.flags = 0;
-
- imdct_init ();
- downmix_init ();
- memset (&syncinfo, 0, sizeof (syncinfo));
- memset (&bsi, 0, sizeof (bsi));
- memset (&audblk, 0, sizeof (audblk));
- sanity_check_init (&syncinfo,&bsi,&audblk);
-}
-
-#ifdef __OMS__
-size_t ac3dec_decode_data (plugin_output_audio_t *output, uint8_t *data_start, uint8_t *data_end)
-#else
-size_t ac3dec_decode_data (uint8_t *data_start ,uint8_t *data_end, int ac3reset, int *input_pointer, int *output_pointer, char *ac3_data)
-#endif
-{
- uint32_t i;
- int datasize;
- char *data;
-
-
- if(ac3reset != 0){
- syncinfo.syncword = 0xffff;
- buffer_size = 0;
- }
-
- if (setjmp (error_jmp_mark) < 0) {
- ac3dec_init ();
- return 0;
- }
-
- while (decode_buffer_syncframe (&syncinfo, &data_start, data_end)) {
- parse_bsi (&bsi);
-
-#ifndef __OMS__
- if(!done_banner) {
- // stats_print_banner(&syncinfo,&bsi);
- done_banner = 1;
- }
-#endif
-
- // compute downmix parameters
- // downmix to tow channels for now
- dm_par.clev = 0.0; dm_par.slev = 0.0; dm_par.unit = 1.0;
- if (bsi.acmod & 0x1) // have center
- dm_par.clev = cmixlev_lut[bsi.cmixlev];
-
- if (bsi.acmod & 0x4) // have surround channels
- dm_par.slev = smixlev_lut[bsi.surmixlev];
-
- dm_par.unit /= 1.0 + dm_par.clev + dm_par.slev;
- dm_par.clev *= dm_par.unit;
- dm_par.slev *= dm_par.unit;
-
- for(i=0; i < 6; i++) {
- //Initialize freq/time sample storage
- memset (samples, 0, sizeof(float) * 256 * (bsi.nfchans + bsi.lfeon));
-
- // Extract most of the audblk info from the bitstream
- // (minus the mantissas
- parse_audblk (&bsi,&audblk);
-
- // Take the differential exponent data and turn it into
- // absolute exponents
- exponent_unpack (&bsi,&audblk);
-
- // Figure out how many bits per mantissa
- bit_allocate (syncinfo.fscod,&bsi,&audblk);
-
- // Extract the mantissas from the stream and
- // generate floating point frequency coefficients
- coeff_unpack (&bsi,&audblk,samples);
-
- if (bsi.acmod == 0x2)
- rematrix (&audblk,samples);
-
- // Convert the frequency samples into time samples
- imdct (&bsi,&audblk,samples, &s16_samples[i * 2 * 256], &dm_par);
-
- // Downmix into the requested number of channels
- // and convert floating point to int16_t
- // downmix(&bsi,samples,&s16_samples[i * 2 * 256]);
-
- if (sanity_check(&syncinfo,&bsi,&audblk) < 0) {
- HANDLE_ERROR ();
- return 0;
- }
-
- continue;
- }
-
- if (!is_output_initialized) {
-#ifdef __OMS__
- plugin_output_audio_attr_t attr;
-#ifdef __sun__
- attr.format = 16;
-#else
- attr.format = AFMT_S16_NE;
-#endif
- attr.speed = syncinfo.sampling_rate;
- attr.channels = 2;
-
- // output->setup (&attr);
-#else
- // ao_functions->open (16, syncinfo.sampling_rate, 2);
-#endif
- is_output_initialized = 1;
- }
-
-#ifdef __OMS__
- output->write (s16_samples, 256 * 6 * 2 * 2);
-#else
- // ao_functions->play(s16_samples, 256 * 6 * 2);
- data = (char *)s16_samples;
- datasize = 0;
- while(datasize < 6144){
- if(((*input_pointer+1) % AC3_BUFFER_SIZE) != *output_pointer){ // There is room in the sync_buffer
- ac3_data[*input_pointer]=data[datasize];
- datasize++;
- *input_pointer = (*input_pointer+1) % AC3_BUFFER_SIZE;
- }
- else{
- *input_pointer = *output_pointer = 0;
- break;
- }
- }
-
-#endif
-
- }
-
- decode_mute ();
-
- return 0;
-}
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