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/*
* 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 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_bytes_output(&pb);
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 (!ff_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;
}
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