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Diffstat (limited to 'libavcodec/dsd.h')
-rw-r--r-- | libavcodec/dsd.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libavcodec/dsd.h b/libavcodec/dsd.h new file mode 100644 index 0000000000..5ca4574837 --- /dev/null +++ b/libavcodec/dsd.h @@ -0,0 +1,52 @@ +/* + * Direct Stream Digital (DSD) decoder + * based on BSD licensed dsd2pcm by Sebastian Gesemann + * Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved. + * Copyright (c) 2014 Peter Ross + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_DSD_H +#define AVCODEC_DSD_H + +#include "libavcodec/internal.h" +#include "libavcodec/mathops.h" +#include "avcodec.h" + +#define HTAPS 48 /** number of FIR constants */ +#define FIFOSIZE 16 /** must be a power of two */ +#define FIFOMASK (FIFOSIZE - 1) /** bit mask for FIFO offsets */ + +#if FIFOSIZE * 8 < HTAPS * 2 +#error "FIFOSIZE too small" +#endif + +/** + * Per-channel buffer + */ +typedef struct DSDContext { + unsigned char buf[FIFOSIZE]; + unsigned pos; +} DSDContext; + +void ff_init_dsd_data(void); + +void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf, + const unsigned char *src, ptrdiff_t src_stride, + float *dst, ptrdiff_t dst_stride); +#endif /* AVCODEC_DSD_H */ |