yading@10: /*
yading@10:  * DCA compatible decoder data
yading@10:  * Copyright (C) 2004 Gildas Bazin
yading@10:  * Copyright (C) 2004 Benjamin Zores
yading@10:  * Copyright (C) 2006 Benjamin Larsson
yading@10:  * Copyright (C) 2007 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include <string.h>
yading@10: 
yading@10: #include "put_bits.h"
yading@10: #include "dca.h"
yading@10: 
yading@10: const uint32_t avpriv_dca_sample_rates[16] =
yading@10: {
yading@10:     0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
yading@10:     12000, 24000, 48000, 96000, 192000
yading@10: };
yading@10: 
yading@10: int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
yading@10:                              int max_size)
yading@10: {
yading@10:     uint32_t mrk;
yading@10:     int i, tmp;
yading@10:     const uint16_t *ssrc = (const uint16_t *) src;
yading@10:     uint16_t *sdst = (uint16_t *) dst;
yading@10:     PutBitContext pb;
yading@10: 
yading@10:     if ((unsigned) src_size > (unsigned) max_size)
yading@10:         src_size = max_size;
yading@10: 
yading@10:     mrk = AV_RB32(src);
yading@10:     switch (mrk) {
yading@10:     case DCA_MARKER_RAW_BE:
yading@10:         memcpy(dst, src, src_size);
yading@10:         return src_size;
yading@10:     case DCA_MARKER_RAW_LE:
yading@10:         for (i = 0; i < (src_size + 1) >> 1; i++)
yading@10:             *sdst++ = av_bswap16(*ssrc++);
yading@10:         return src_size;
yading@10:     case DCA_MARKER_14B_BE:
yading@10:     case DCA_MARKER_14B_LE:
yading@10:         init_put_bits(&pb, dst, max_size);
yading@10:         for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
yading@10:             tmp = ((mrk == DCA_MARKER_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
yading@10:             put_bits(&pb, 14, tmp);
yading@10:         }
yading@10:         flush_put_bits(&pb);
yading@10:         return (put_bits_count(&pb) + 7) >> 3;
yading@10:     default:
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: }