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Diffstat (limited to 'plugins/demac/libdemac/decoder.c')
| -rw-r--r-- | plugins/demac/libdemac/decoder.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/plugins/demac/libdemac/decoder.c b/plugins/demac/libdemac/decoder.c deleted file mode 100644 index f6826fca..00000000 --- a/plugins/demac/libdemac/decoder.c +++ /dev/null @@ -1,192 +0,0 @@ -/* - -libdemac - A Monkey's Audio decoder - -$Id: decoder.c 19552 2008-12-21 23:49:02Z amiconn $ - -Copyright (C) Dave Chapman 2007 - -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 St, Fifth Floor, Boston, MA 02110, USA - -*/ -#include <inttypes.h> -#include <string.h> - -#include "demac.h" -#include "predictor.h" -#include "entropy.h" -#include "filter.h" -#include "demac_config.h" - -/* Statically allocate the filter buffers */ - -static filter_int filterbuf32[(32*3 + FILTER_HISTORY_SIZE) * 2] - IBSS_ATTR __attribute__((aligned(16))); /* 2432/4864 bytes */ -static filter_int filterbuf256[(256*3 + FILTER_HISTORY_SIZE) * 2] - IBSS_ATTR __attribute__((aligned(16))); /* 5120/10240 bytes */ - -/* This is only needed for "insane" files, and no current Rockbox targets - can hope to decode them in realtime, although the Gigabeat S comes close. */ -static filter_int filterbuf1280[(1280*3 + FILTER_HISTORY_SIZE) * 2] - IBSS_ATTR_DEMAC_INSANEBUF __attribute__((aligned(16))); - /* 17408 or 34816 bytes */ - -void init_frame_decoder(struct ape_ctx_t* ape_ctx, - unsigned char* inbuffer, int* firstbyte, - int* bytesconsumed) -{ - init_entropy_decoder(ape_ctx, inbuffer, firstbyte, bytesconsumed); - //printf("CRC=0x%08x\n",ape_ctx->CRC); - //printf("Flags=0x%08x\n",ape_ctx->frameflags); - - init_predictor_decoder(&ape_ctx->predictor); - - switch (ape_ctx->compressiontype) - { - case 2000: - init_filter_16_11(filterbuf32); - break; - - case 3000: - init_filter_64_11(filterbuf256); - break; - - case 4000: - init_filter_256_13(filterbuf256); - init_filter_32_10(filterbuf32); - break; - - case 5000: - init_filter_1280_15(filterbuf1280); - init_filter_256_13(filterbuf256); - init_filter_16_11(filterbuf32); - } -} - -int ICODE_ATTR_DEMAC decode_chunk(struct ape_ctx_t* ape_ctx, - unsigned char* inbuffer, int* firstbyte, - int* bytesconsumed, - int32_t* decoded0, int32_t* decoded1, - int count) -{ - int32_t left, right; -#ifdef ROCKBOX - int scale = (APE_OUTPUT_DEPTH - ape_ctx->bps); - #define SCALE(x) ((x) << scale) -#else - #define SCALE(x) (x) -#endif - - if ((ape_ctx->channels==1) || ((ape_ctx->frameflags - & (APE_FRAMECODE_PSEUDO_STEREO|APE_FRAMECODE_STEREO_SILENCE)) - == APE_FRAMECODE_PSEUDO_STEREO)) { - - entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, - decoded0, NULL, count); - - if (ape_ctx->frameflags & APE_FRAMECODE_MONO_SILENCE) { - /* We are pure silence, so we're done. */ - return 0; - } - - switch (ape_ctx->compressiontype) - { - case 2000: - apply_filter_16_11(ape_ctx->fileversion,decoded0,NULL,count); - break; - - case 3000: - apply_filter_64_11(ape_ctx->fileversion,decoded0,NULL,count); - break; - - case 4000: - apply_filter_32_10(ape_ctx->fileversion,decoded0,NULL,count); - apply_filter_256_13(ape_ctx->fileversion,decoded0,NULL,count); - break; - - case 5000: - apply_filter_16_11(ape_ctx->fileversion,decoded0,NULL,count); - apply_filter_256_13(ape_ctx->fileversion,decoded0,NULL,count); - apply_filter_1280_15(ape_ctx->fileversion,decoded0,NULL,count); - } - - /* Now apply the predictor decoding */ - predictor_decode_mono(&ape_ctx->predictor,decoded0,count); - - if (ape_ctx->channels==2) { - /* Pseudo-stereo - copy left channel to right channel */ - while (count--) - { - left = *decoded0; - *(decoded1++) = *(decoded0++) = SCALE(left); - } - } -#ifdef ROCKBOX - else { - /* Scale to output depth */ - while (count--) - { - left = *decoded0; - *(decoded0++) = SCALE(left); - } - } -#endif - } else { /* Stereo */ - entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, - decoded0, decoded1, count); - - if ((ape_ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) - == APE_FRAMECODE_STEREO_SILENCE) { - /* We are pure silence, so we're done. */ - return 0; - } - - /* Apply filters - compression type 1000 doesn't have any */ - switch (ape_ctx->compressiontype) - { - case 2000: - apply_filter_16_11(ape_ctx->fileversion,decoded0,decoded1,count); - break; - - case 3000: - apply_filter_64_11(ape_ctx->fileversion,decoded0,decoded1,count); - break; - - case 4000: - apply_filter_32_10(ape_ctx->fileversion,decoded0,decoded1,count); - apply_filter_256_13(ape_ctx->fileversion,decoded0,decoded1,count); - break; - - case 5000: - apply_filter_16_11(ape_ctx->fileversion,decoded0,decoded1,count); - apply_filter_256_13(ape_ctx->fileversion,decoded0,decoded1,count); - apply_filter_1280_15(ape_ctx->fileversion,decoded0,decoded1,count); - } - - /* Now apply the predictor decoding */ - predictor_decode_stereo(&ape_ctx->predictor,decoded0,decoded1,count); - - /* Decorrelate and scale to output depth */ - while (count--) - { - left = *decoded1 - (*decoded0 / 2); - right = left + *decoded0; - - *(decoded0++) = SCALE(left); - *(decoded1++) = SCALE(right); - } - } - return 0; -} |