/* * DCA compatible decoder data * Copyright (C) 2004 Gildas Bazin * Copyright (C) 2004 Benjamin Zores * Copyright (C) 2006 Benjamin Larsson * Copyright (C) 2007 Konstantin Shishkov * * 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 */ #include <stdint.h> #include <string.h> #include "libavutil/error.h" #include "dca.h" #include "dca_syncwords.h" #include "put_bits.h" const uint32_t avpriv_dca_sample_rates[16] = { 0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0, 12000, 24000, 48000, 96000, 192000 }; int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, int max_size) { uint32_t mrk; int i, tmp; const uint16_t *ssrc = (const uint16_t *) src; uint16_t *sdst = (uint16_t *) dst; PutBitContext pb; if ((unsigned) src_size > (unsigned) max_size) src_size = max_size; mrk = AV_RB32(src); switch (mrk) { case DCA_SYNCWORD_CORE_BE: memcpy(dst, src, src_size); return src_size; case DCA_SYNCWORD_CORE_LE: for (i = 0; i < (src_size + 1) >> 1; i++) *sdst++ = av_bswap16(*ssrc++); return src_size; case DCA_SYNCWORD_CORE_14B_BE: case DCA_SYNCWORD_CORE_14B_LE: init_put_bits(&pb, dst, max_size); for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) { tmp = ((mrk == DCA_SYNCWORD_CORE_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF; put_bits(&pb, 14, tmp); } flush_put_bits(&pb); return (put_bits_count(&pb) + 7) >> 3; default: return AVERROR_INVALIDDATA; } }