| /* |
| * 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; |
| } |