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69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/*
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* DCA compatible decoder data
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <string.h>
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#include "libavutil/error.h"
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#include "dca.h"
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#include "dca_syncwords.h"
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#include "put_bits.h"
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const uint32_t avpriv_dca_sample_rates[16] = {
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0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
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12000, 24000, 48000, 96000, 192000
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};
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int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
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int max_size)
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{
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uint32_t mrk;
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int i, tmp;
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const uint16_t *ssrc = (const uint16_t *) src;
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uint16_t *sdst = (uint16_t *) dst;
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PutBitContext pb;
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if ((unsigned) src_size > (unsigned) max_size)
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src_size = max_size;
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mrk = AV_RB32(src);
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switch (mrk) {
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case DCA_SYNCWORD_CORE_BE:
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memcpy(dst, src, src_size);
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return src_size;
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case DCA_SYNCWORD_CORE_LE:
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for (i = 0; i < (src_size + 1) >> 1; i++)
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*sdst++ = av_bswap16(*ssrc++);
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return src_size;
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case DCA_SYNCWORD_CORE_14B_BE:
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case DCA_SYNCWORD_CORE_14B_LE:
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init_put_bits(&pb, dst, max_size);
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for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
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tmp = ((mrk == DCA_SYNCWORD_CORE_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
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put_bits(&pb, 14, tmp);
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}
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flush_put_bits(&pb);
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return (put_bits_count(&pb) + 7) >> 3;
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default:
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return AVERROR_INVALIDDATA;
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}
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}
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