/* * 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_core.h" #include "dca_syncwords.h" #include "get_bits.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 }; const uint32_t ff_dca_sampling_freqs[16] = { 8000, 16000, 32000, 64000, 128000, 22050, 44100, 88200, 176400, 352800, 12000, 24000, 48000, 96000, 192000, 384000, }; const uint8_t ff_dca_freq_ranges[16] = { 0, 1, 2, 3, 4, 1, 2, 3, 4, 4, 0, 1, 2, 3, 4, 4 }; const uint8_t ff_dca_bits_per_sample[8] = { 16, 16, 20, 20, 0, 24, 24, 0 }; int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, int max_size) { uint32_t mrk; int i, tmp; PutBitContext pb; if ((unsigned) src_size > (unsigned) max_size) src_size = max_size; mrk = AV_RB32(src); switch (mrk) { case DCA_SYNCWORD_CORE_BE: case DCA_SYNCWORD_SUBSTREAM: memcpy(dst, src, src_size); return src_size; case DCA_SYNCWORD_CORE_LE: for (i = 0; i < (src_size + 1) >> 1; i++) { AV_WB16(dst, AV_RL16(src)); src += 2; dst += 2; } 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; } } int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb) { if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE) return DCA_PARSE_ERROR_SYNC_WORD; h->normal_frame = get_bits1(gb); h->deficit_samples = get_bits(gb, 5) + 1; if (h->deficit_samples != DCA_PCMBLOCK_SAMPLES) return DCA_PARSE_ERROR_DEFICIT_SAMPLES; h->crc_present = get_bits1(gb); h->npcmblocks = get_bits(gb, 7) + 1; if (h->npcmblocks & (DCA_SUBBAND_SAMPLES - 1)) return DCA_PARSE_ERROR_PCM_BLOCKS; h->frame_size = get_bits(gb, 14) + 1; if (h->frame_size < 96) return DCA_PARSE_ERROR_FRAME_SIZE; h->audio_mode = get_bits(gb, 6); if (h->audio_mode >= DCA_AMODE_COUNT) return DCA_PARSE_ERROR_AMODE; h->sr_code = get_bits(gb, 4); if (!avpriv_dca_sample_rates[h->sr_code]) return DCA_PARSE_ERROR_SAMPLE_RATE; h->br_code = get_bits(gb, 5); if (get_bits1(gb)) return DCA_PARSE_ERROR_RESERVED_BIT; h->drc_present = get_bits1(gb); h->ts_present = get_bits1(gb); h->aux_present = get_bits1(gb); h->hdcd_master = get_bits1(gb); h->ext_audio_type = get_bits(gb, 3); h->ext_audio_present = get_bits1(gb); h->sync_ssf = get_bits1(gb); h->lfe_present = get_bits(gb, 2); if (h->lfe_present == DCA_LFE_FLAG_INVALID) return DCA_PARSE_ERROR_LFE_FLAG; h->predictor_history = get_bits1(gb); if (h->crc_present) skip_bits(gb, 16); h->filter_perfect = get_bits1(gb); h->encoder_rev = get_bits(gb, 4); h->copy_hist = get_bits(gb, 2); h->pcmr_code = get_bits(gb, 3); if (!ff_dca_bits_per_sample[h->pcmr_code]) return DCA_PARSE_ERROR_PCM_RES; h->sumdiff_front = get_bits1(gb); h->sumdiff_surround = get_bits1(gb); h->dn_code = get_bits(gb, 4); return 0; } int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size) { GetBitContext gb; int ret; ret = init_get_bits8(&gb, buf, size); if (ret < 0) return ret; if (ff_dca_parse_core_frame_header(h, &gb) < 0) return AVERROR_INVALIDDATA; return 0; }