459 lines
14 KiB
C
459 lines
14 KiB
C
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "libavutil/crc.h"
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#include "libavutil/float_dsp.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/tx.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "hca_data.h"
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typedef struct ChannelContext {
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float base[128];
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DECLARE_ALIGNED(32, float, imdct_in)[128];
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DECLARE_ALIGNED(32, float, imdct_out)[128];
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DECLARE_ALIGNED(32, float, imdct_prev)[128];
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int8_t scale_factors[128];
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uint8_t scale[128];
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int8_t intensity[8];
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int8_t *hfr_scale;
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unsigned count;
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int chan_type;
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} ChannelContext;
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typedef struct HCAContext {
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GetBitContext gb;
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const AVCRC *crc_table;
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ChannelContext ch[16];
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uint8_t ath[128];
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int ath_type;
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unsigned hfr_group_count;
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uint8_t track_count;
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uint8_t channel_config;
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uint8_t total_band_count;
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uint8_t base_band_count;
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uint8_t stereo_band_count;
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uint8_t bands_per_hfr_group;
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av_tx_fn tx_fn;
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AVTXContext *tx_ctx;
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AVFloatDSPContext *fdsp;
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} HCAContext;
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static void ath_init1(uint8_t *ath, int sample_rate)
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{
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unsigned int index;
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unsigned int acc = 0;
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for (int i = 0; i < 128; i++) {
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acc += sample_rate;
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index = acc >> 13;
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if (index >= 654) {
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memset(ath+i, 0xFF, (128 - i));
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break;
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}
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ath[i] = ath_base_curve[index];
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}
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}
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static int ath_init(uint8_t *ath, int type, int sample_rate)
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{
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switch (type) {
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case 0:
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/* nothing to do */
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break;
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case 1:
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ath_init1(ath, sample_rate);
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static inline unsigned ceil2(unsigned a, unsigned b)
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{
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return (b > 0) ? (a / b + ((a % b) ? 1 : 0)) : 0;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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HCAContext *c = avctx->priv_data;
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GetBitContext *gb = &c->gb;
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int8_t r[16] = { 0 };
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float scale = 1.f / 8.f;
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unsigned b, chunk;
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int version, ret;
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avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
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c->crc_table = av_crc_get_table(AV_CRC_16_ANSI);
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if (avctx->channels <= 0 || avctx->channels > 16)
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return AVERROR(EINVAL);
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ret = init_get_bits8(gb, avctx->extradata, avctx->extradata_size);
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if (ret < 0)
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return ret;
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skip_bits_long(gb, 32);
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version = get_bits(gb, 16);
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skip_bits_long(gb, 16);
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c->ath_type = version >= 0x200 ? 0 : 1;
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if (get_bits_long(gb, 32) != MKBETAG('f', 'm', 't', 0))
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return AVERROR_INVALIDDATA;
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skip_bits_long(gb, 32);
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skip_bits_long(gb, 32);
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skip_bits_long(gb, 32);
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chunk = get_bits_long(gb, 32);
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if (chunk == MKBETAG('c', 'o', 'm', 'p')) {
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skip_bits_long(gb, 16);
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skip_bits_long(gb, 8);
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skip_bits_long(gb, 8);
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c->track_count = get_bits(gb, 8);
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c->channel_config = get_bits(gb, 8);
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c->total_band_count = get_bits(gb, 8);
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c->base_band_count = get_bits(gb, 8);
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c->stereo_band_count = get_bits(gb, 8);
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c->bands_per_hfr_group = get_bits(gb, 8);
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} else if (chunk == MKBETAG('d', 'e', 'c', 0)) {
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skip_bits_long(gb, 16);
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skip_bits_long(gb, 8);
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skip_bits_long(gb, 8);
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c->total_band_count = get_bits(gb, 8) + 1;
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c->base_band_count = get_bits(gb, 8) + 1;
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c->track_count = get_bits(gb, 4);
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c->channel_config = get_bits(gb, 4);
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if (!get_bits(gb, 8))
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c->base_band_count = c->total_band_count;
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c->stereo_band_count = c->total_band_count - c->base_band_count;
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c->bands_per_hfr_group = 0;
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} else
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return AVERROR_INVALIDDATA;
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if (c->total_band_count > FF_ARRAY_ELEMS(c->ch->imdct_in))
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return AVERROR_INVALIDDATA;
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while (get_bits_left(gb) >= 32) {
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chunk = get_bits_long(gb, 32);
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if (chunk == MKBETAG('v', 'b', 'r', 0)) {
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skip_bits_long(gb, 16);
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skip_bits_long(gb, 16);
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} else if (chunk == MKBETAG('a', 't', 'h', 0)) {
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c->ath_type = get_bits(gb, 16);
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} else if (chunk == MKBETAG('r', 'v', 'a', 0)) {
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skip_bits_long(gb, 32);
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} else if (chunk == MKBETAG('c', 'o', 'm', 'm')) {
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skip_bits_long(gb, get_bits(gb, 8) * 8);
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} else if (chunk == MKBETAG('c', 'i', 'p', 'h')) {
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skip_bits_long(gb, 16);
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} else if (chunk == MKBETAG('l', 'o', 'o', 'p')) {
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skip_bits_long(gb, 32);
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skip_bits_long(gb, 32);
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skip_bits_long(gb, 16);
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skip_bits_long(gb, 16);
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} else if (chunk == MKBETAG('p', 'a', 'd', 0)) {
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break;
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} else {
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break;
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}
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}
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ret = ath_init(c->ath, c->ath_type, avctx->sample_rate);
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if (ret < 0)
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return ret;
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if (!c->track_count)
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c->track_count = 1;
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b = avctx->channels / c->track_count;
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if (c->stereo_band_count && b > 1) {
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int8_t *x = r;
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for (int i = 0; i < c->track_count; i++, x+=b) {
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switch (b) {
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case 2:
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case 3:
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x[0] = 1;
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x[1] = 2;
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break;
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case 4:
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x[0]=1; x[1] = 2;
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if (c->channel_config == 0) {
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x[2]=1;
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x[3]=2;
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}
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break;
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case 5:
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x[0]=1; x[1] = 2;
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if (c->channel_config <= 2) {
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x[3]=1;
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x[4]=2;
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}
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break;
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case 6:
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case 7:
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x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2;
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break;
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case 8:
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x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2; x[6] = 1; x[7] = 2;
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break;
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}
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}
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}
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if (c->total_band_count < c->base_band_count)
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return AVERROR_INVALIDDATA;
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c->hfr_group_count = ceil2(c->total_band_count - (c->base_band_count + c->stereo_band_count),
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c->bands_per_hfr_group);
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if (c->base_band_count + c->stereo_band_count + (unsigned long)c->hfr_group_count > 128ULL)
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return AVERROR_INVALIDDATA;
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for (int i = 0; i < avctx->channels; i++) {
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c->ch[i].chan_type = r[i];
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c->ch[i].count = c->base_band_count + ((r[i] != 2) ? c->stereo_band_count : 0);
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c->ch[i].hfr_scale = &c->ch[i].scale_factors[c->base_band_count + c->stereo_band_count];
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if (c->ch[i].count > 128)
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return AVERROR_INVALIDDATA;
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}
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c->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
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if (!c->fdsp)
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return AVERROR(ENOMEM);
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return av_tx_init(&c->tx_ctx, &c->tx_fn, AV_TX_FLOAT_MDCT, 1, 128, &scale, 0);
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}
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static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
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{
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c->tx_fn(c->tx_ctx, ch->imdct_out, ch->imdct_in, sizeof(float));
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c->fdsp->vector_fmul_window(out, ch->imdct_prev + (128 >> 1),
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ch->imdct_out, window, 128 >> 1);
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memcpy(ch->imdct_prev, ch->imdct_out, 128 * sizeof(float));
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}
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static void apply_intensity_stereo(HCAContext *s, ChannelContext *ch1, ChannelContext *ch2,
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int index, unsigned band_count, unsigned base_band_count,
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unsigned stereo_band_count)
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{
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float ratio_l = intensity_ratio_table[ch1->intensity[index]];
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float ratio_r = ratio_l - 2.0f;
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float *c1 = &ch1->imdct_in[base_band_count];
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float *c2 = &ch2->imdct_in[base_band_count];
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if (ch1->chan_type != 1 || !stereo_band_count)
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return;
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for (int i = 0; i < band_count; i++) {
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*(c2++) = *c1 * ratio_r;
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*(c1++) *= ratio_l;
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}
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}
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static void reconstruct_hfr(HCAContext *s, ChannelContext *ch,
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unsigned hfr_group_count,
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unsigned bands_per_hfr_group,
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unsigned start_band, unsigned total_band_count)
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{
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if (ch->chan_type == 2 || !bands_per_hfr_group)
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return;
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for (int i = 0, k = start_band, l = start_band - 1; i < hfr_group_count; i++){
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for (int j = 0; j < bands_per_hfr_group && k < total_band_count && l >= 0; j++, k++, l--){
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ch->imdct_in[k] = scale_conversion_table[ (ch->hfr_scale[i] - ch->scale_factors[l]) & 63 ] * ch->imdct_in[l];
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}
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}
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ch->imdct_in[127] = 0;
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}
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static void dequantize_coefficients(HCAContext *c, ChannelContext *ch)
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{
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GetBitContext *gb = &c->gb;
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for (int i = 0; i < ch->count; i++) {
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unsigned scale = ch->scale[i];
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int nb_bits = max_bits_table[scale];
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int value = get_bitsz(gb, nb_bits);
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float factor;
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if (scale > 7) {
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value = (1 - ((value & 1) << 1)) * (value >> 1);
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if (!value)
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skip_bits_long(gb, -1);
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factor = value;
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} else {
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value += scale << 4;
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skip_bits_long(gb, quant_spectrum_bits[value] - nb_bits);
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factor = quant_spectrum_value[value];
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}
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ch->imdct_in[i] = factor * ch->base[i];
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}
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memset(ch->imdct_in + ch->count, 0, sizeof(ch->imdct_in) - ch->count * sizeof(ch->imdct_in[0]));
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}
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static void unpack(HCAContext *c, ChannelContext *ch,
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unsigned hfr_group_count,
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int packed_noise_level,
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const uint8_t *ath)
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{
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GetBitContext *gb = &c->gb;
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int delta_bits = get_bits(gb, 3);
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if (delta_bits > 5) {
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for (int i = 0; i < ch->count; i++)
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ch->scale_factors[i] = get_bits(gb, 6);
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} else if (delta_bits) {
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int factor = get_bits(gb, 6);
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int max_value = (1 << delta_bits) - 1;
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int half_max = max_value >> 1;
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ch->scale_factors[0] = factor;
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for (int i = 1; i < ch->count; i++){
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int delta = get_bits(gb, delta_bits);
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if (delta == max_value) {
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factor = get_bits(gb, 6);
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} else {
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factor += delta - half_max;
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}
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factor = av_clip_uintp2(factor, 6);
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ch->scale_factors[i] = factor;
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}
|
||
|
|
} else {
|
||
|
|
memset(ch->scale_factors, 0, 128);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ch->chan_type == 2){
|
||
|
|
ch->intensity[0] = get_bits(gb, 4);
|
||
|
|
if (ch->intensity[0] < 15) {
|
||
|
|
for (int i = 1; i < 8; i++)
|
||
|
|
ch->intensity[i] = get_bits(gb, 4);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
for (int i = 0; i < hfr_group_count; i++)
|
||
|
|
ch->hfr_scale[i] = get_bits(gb, 6);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int i = 0; i < ch->count; i++) {
|
||
|
|
int scale = ch->scale_factors[i];
|
||
|
|
|
||
|
|
if (scale) {
|
||
|
|
scale = c->ath[i] + ((packed_noise_level + i) >> 8) - ((scale * 5) >> 1) + 2;
|
||
|
|
scale = scale_table[av_clip(scale, 0, 58)];
|
||
|
|
}
|
||
|
|
ch->scale[i] = scale;
|
||
|
|
}
|
||
|
|
|
||
|
|
memset(ch->scale + ch->count, 0, sizeof(ch->scale) - ch->count);
|
||
|
|
|
||
|
|
for (int i = 0; i < ch->count; i++)
|
||
|
|
ch->base[i] = dequantizer_scaling_table[ch->scale_factors[i]] * quant_step_size[ch->scale[i]];
|
||
|
|
}
|
||
|
|
|
||
|
|
static int decode_frame(AVCodecContext *avctx, void *data,
|
||
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
||
|
|
{
|
||
|
|
AVFrame *frame = data;
|
||
|
|
HCAContext *c = avctx->priv_data;
|
||
|
|
int ch, ret, packed_noise_level;
|
||
|
|
GetBitContext *gb = &c->gb;
|
||
|
|
float **samples;
|
||
|
|
|
||
|
|
if (avctx->err_recognition & AV_EF_CRCCHECK) {
|
||
|
|
if (av_crc(c->crc_table, 0, avpkt->data, avpkt->size))
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((ret = init_get_bits8(gb, avpkt->data, avpkt->size)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (get_bits(gb, 16) != 0xFFFF)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
|
||
|
|
frame->nb_samples = 1024;
|
||
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
||
|
|
return ret;
|
||
|
|
samples = (float **)frame->extended_data;
|
||
|
|
|
||
|
|
packed_noise_level = (get_bits(gb, 9) << 8) - get_bits(gb, 7);
|
||
|
|
|
||
|
|
for (ch = 0; ch < avctx->channels; ch++)
|
||
|
|
unpack(c, &c->ch[ch], c->hfr_group_count, packed_noise_level, c->ath);
|
||
|
|
|
||
|
|
for (int i = 0; i < 8; i++) {
|
||
|
|
for (ch = 0; ch < avctx->channels; ch++)
|
||
|
|
dequantize_coefficients(c, &c->ch[ch]);
|
||
|
|
for (ch = 0; ch < avctx->channels; ch++)
|
||
|
|
reconstruct_hfr(c, &c->ch[ch], c->hfr_group_count, c->bands_per_hfr_group,
|
||
|
|
c->stereo_band_count + c->base_band_count, c->total_band_count);
|
||
|
|
for (ch = 0; ch < avctx->channels - 1; ch++)
|
||
|
|
apply_intensity_stereo(c, &c->ch[ch], &c->ch[ch+1], i,
|
||
|
|
c->total_band_count - c->base_band_count,
|
||
|
|
c->base_band_count, c->stereo_band_count);
|
||
|
|
for (ch = 0; ch < avctx->channels; ch++)
|
||
|
|
run_imdct(c, &c->ch[ch], i, samples[ch] + i * 128);
|
||
|
|
}
|
||
|
|
|
||
|
|
*got_frame_ptr = 1;
|
||
|
|
|
||
|
|
return avpkt->size;
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
HCAContext *c = avctx->priv_data;
|
||
|
|
|
||
|
|
av_freep(&c->fdsp);
|
||
|
|
av_tx_uninit(&c->tx_ctx);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodec ff_hca_decoder = {
|
||
|
|
.name = "hca",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
|
||
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
|
.id = AV_CODEC_ID_HCA,
|
||
|
|
.priv_data_size = sizeof(HCAContext),
|
||
|
|
.init = decode_init,
|
||
|
|
.decode = decode_frame,
|
||
|
|
.close = decode_close,
|
||
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
||
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
|
||
|
|
AV_SAMPLE_FMT_NONE },
|
||
|
|
};
|