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ffmpeg/libavcodec/hcadec.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

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C
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/*
* 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 "libavutil/crc.h"
#include "libavutil/float_dsp.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem_internal.h"
#include "libavutil/tx.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "hca_data.h"
typedef struct ChannelContext {
float base[128];
DECLARE_ALIGNED(32, float, imdct_in)[128];
DECLARE_ALIGNED(32, float, imdct_out)[128];
DECLARE_ALIGNED(32, float, imdct_prev)[128];
int8_t scale_factors[128];
uint8_t scale[128];
int8_t intensity[8];
int8_t *hfr_scale;
unsigned count;
int chan_type;
} ChannelContext;
typedef struct HCAContext {
GetBitContext gb;
const AVCRC *crc_table;
ChannelContext ch[16];
uint8_t ath[128];
int ath_type;
unsigned hfr_group_count;
uint8_t track_count;
uint8_t channel_config;
uint8_t total_band_count;
uint8_t base_band_count;
uint8_t stereo_band_count;
uint8_t bands_per_hfr_group;
av_tx_fn tx_fn;
AVTXContext *tx_ctx;
AVFloatDSPContext *fdsp;
} HCAContext;
static void ath_init1(uint8_t *ath, int sample_rate)
{
unsigned int index;
unsigned int acc = 0;
for (int i = 0; i < 128; i++) {
acc += sample_rate;
index = acc >> 13;
if (index >= 654) {
memset(ath+i, 0xFF, (128 - i));
break;
}
ath[i] = ath_base_curve[index];
}
}
static int ath_init(uint8_t *ath, int type, int sample_rate)
{
switch (type) {
case 0:
/* nothing to do */
break;
case 1:
ath_init1(ath, sample_rate);
break;
default:
return AVERROR_INVALIDDATA;
}
return 0;
}
static inline unsigned ceil2(unsigned a, unsigned b)
{
return (b > 0) ? (a / b + ((a % b) ? 1 : 0)) : 0;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
HCAContext *c = avctx->priv_data;
GetBitContext *gb = &c->gb;
int8_t r[16] = { 0 };
float scale = 1.f / 8.f;
unsigned b, chunk;
int version, ret;
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
c->crc_table = av_crc_get_table(AV_CRC_16_ANSI);
if (avctx->channels <= 0 || avctx->channels > 16)
return AVERROR(EINVAL);
ret = init_get_bits8(gb, avctx->extradata, avctx->extradata_size);
if (ret < 0)
return ret;
skip_bits_long(gb, 32);
version = get_bits(gb, 16);
skip_bits_long(gb, 16);
c->ath_type = version >= 0x200 ? 0 : 1;
if (get_bits_long(gb, 32) != MKBETAG('f', 'm', 't', 0))
return AVERROR_INVALIDDATA;
skip_bits_long(gb, 32);
skip_bits_long(gb, 32);
skip_bits_long(gb, 32);
chunk = get_bits_long(gb, 32);
if (chunk == MKBETAG('c', 'o', 'm', 'p')) {
skip_bits_long(gb, 16);
skip_bits_long(gb, 8);
skip_bits_long(gb, 8);
c->track_count = get_bits(gb, 8);
c->channel_config = get_bits(gb, 8);
c->total_band_count = get_bits(gb, 8);
c->base_band_count = get_bits(gb, 8);
c->stereo_band_count = get_bits(gb, 8);
c->bands_per_hfr_group = get_bits(gb, 8);
} else if (chunk == MKBETAG('d', 'e', 'c', 0)) {
skip_bits_long(gb, 16);
skip_bits_long(gb, 8);
skip_bits_long(gb, 8);
c->total_band_count = get_bits(gb, 8) + 1;
c->base_band_count = get_bits(gb, 8) + 1;
c->track_count = get_bits(gb, 4);
c->channel_config = get_bits(gb, 4);
if (!get_bits(gb, 8))
c->base_band_count = c->total_band_count;
c->stereo_band_count = c->total_band_count - c->base_band_count;
c->bands_per_hfr_group = 0;
} else
return AVERROR_INVALIDDATA;
if (c->total_band_count > FF_ARRAY_ELEMS(c->ch->imdct_in))
return AVERROR_INVALIDDATA;
while (get_bits_left(gb) >= 32) {
chunk = get_bits_long(gb, 32);
if (chunk == MKBETAG('v', 'b', 'r', 0)) {
skip_bits_long(gb, 16);
skip_bits_long(gb, 16);
} else if (chunk == MKBETAG('a', 't', 'h', 0)) {
c->ath_type = get_bits(gb, 16);
} else if (chunk == MKBETAG('r', 'v', 'a', 0)) {
skip_bits_long(gb, 32);
} else if (chunk == MKBETAG('c', 'o', 'm', 'm')) {
skip_bits_long(gb, get_bits(gb, 8) * 8);
} else if (chunk == MKBETAG('c', 'i', 'p', 'h')) {
skip_bits_long(gb, 16);
} else if (chunk == MKBETAG('l', 'o', 'o', 'p')) {
skip_bits_long(gb, 32);
skip_bits_long(gb, 32);
skip_bits_long(gb, 16);
skip_bits_long(gb, 16);
} else if (chunk == MKBETAG('p', 'a', 'd', 0)) {
break;
} else {
break;
}
}
ret = ath_init(c->ath, c->ath_type, avctx->sample_rate);
if (ret < 0)
return ret;
if (!c->track_count)
c->track_count = 1;
b = avctx->channels / c->track_count;
if (c->stereo_band_count && b > 1) {
int8_t *x = r;
for (int i = 0; i < c->track_count; i++, x+=b) {
switch (b) {
case 2:
case 3:
x[0] = 1;
x[1] = 2;
break;
case 4:
x[0]=1; x[1] = 2;
if (c->channel_config == 0) {
x[2]=1;
x[3]=2;
}
break;
case 5:
x[0]=1; x[1] = 2;
if (c->channel_config <= 2) {
x[3]=1;
x[4]=2;
}
break;
case 6:
case 7:
x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2;
break;
case 8:
x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2; x[6] = 1; x[7] = 2;
break;
}
}
}
if (c->total_band_count < c->base_band_count)
return AVERROR_INVALIDDATA;
c->hfr_group_count = ceil2(c->total_band_count - (c->base_band_count + c->stereo_band_count),
c->bands_per_hfr_group);
if (c->base_band_count + c->stereo_band_count + (unsigned long)c->hfr_group_count > 128ULL)
return AVERROR_INVALIDDATA;
for (int i = 0; i < avctx->channels; i++) {
c->ch[i].chan_type = r[i];
c->ch[i].count = c->base_band_count + ((r[i] != 2) ? c->stereo_band_count : 0);
c->ch[i].hfr_scale = &c->ch[i].scale_factors[c->base_band_count + c->stereo_band_count];
if (c->ch[i].count > 128)
return AVERROR_INVALIDDATA;
}
c->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!c->fdsp)
return AVERROR(ENOMEM);
return av_tx_init(&c->tx_ctx, &c->tx_fn, AV_TX_FLOAT_MDCT, 1, 128, &scale, 0);
}
static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
{
c->tx_fn(c->tx_ctx, ch->imdct_out, ch->imdct_in, sizeof(float));
c->fdsp->vector_fmul_window(out, ch->imdct_prev + (128 >> 1),
ch->imdct_out, window, 128 >> 1);
memcpy(ch->imdct_prev, ch->imdct_out, 128 * sizeof(float));
}
static void apply_intensity_stereo(HCAContext *s, ChannelContext *ch1, ChannelContext *ch2,
int index, unsigned band_count, unsigned base_band_count,
unsigned stereo_band_count)
{
float ratio_l = intensity_ratio_table[ch2->intensity[index]];
float ratio_r = ratio_l - 2.0f;
float *c1 = &ch1->imdct_in[base_band_count];
float *c2 = &ch2->imdct_in[base_band_count];
if (ch1->chan_type != 1 || !stereo_band_count)
return;
for (int i = 0; i < band_count; i++) {
*(c2++) = *c1 * ratio_r;
*(c1++) *= ratio_l;
}
}
static void reconstruct_hfr(HCAContext *s, ChannelContext *ch,
unsigned hfr_group_count,
unsigned bands_per_hfr_group,
unsigned start_band, unsigned total_band_count)
{
if (ch->chan_type == 2 || !bands_per_hfr_group)
return;
for (int i = 0, k = start_band, l = start_band - 1; i < hfr_group_count; i++){
for (int j = 0; j < bands_per_hfr_group && k < total_band_count && l >= 0; j++, k++, l--){
ch->imdct_in[k] = scale_conversion_table[ scale_conv_bias +
av_clip_intp2(ch->hfr_scale[i] - ch->scale_factors[l], 6) ] * ch->imdct_in[l];
}
}
ch->imdct_in[127] = 0;
}
static void dequantize_coefficients(HCAContext *c, ChannelContext *ch)
{
GetBitContext *gb = &c->gb;
for (int i = 0; i < ch->count; i++) {
unsigned scale = ch->scale[i];
int nb_bits = max_bits_table[scale];
int value = get_bitsz(gb, nb_bits);
float factor;
if (scale > 7) {
value = (1 - ((value & 1) << 1)) * (value >> 1);
if (!value)
skip_bits_long(gb, -1);
factor = value;
} else {
value += scale << 4;
skip_bits_long(gb, quant_spectrum_bits[value] - nb_bits);
factor = quant_spectrum_value[value];
}
ch->imdct_in[i] = factor * ch->base[i];
}
memset(ch->imdct_in + ch->count, 0, sizeof(ch->imdct_in) - ch->count * sizeof(ch->imdct_in[0]));
}
static void unpack(HCAContext *c, ChannelContext *ch,
unsigned hfr_group_count,
int packed_noise_level,
const uint8_t *ath)
{
GetBitContext *gb = &c->gb;
int delta_bits = get_bits(gb, 3);
if (delta_bits > 5) {
for (int i = 0; i < ch->count; i++)
ch->scale_factors[i] = get_bits(gb, 6);
} else if (delta_bits) {
int factor = get_bits(gb, 6);
int max_value = (1 << delta_bits) - 1;
int half_max = max_value >> 1;
ch->scale_factors[0] = factor;
for (int i = 1; i < ch->count; i++){
int delta = get_bits(gb, delta_bits);
if (delta == max_value) {
factor = get_bits(gb, 6);
} else {
factor += delta - half_max;
}
factor = av_clip_uintp2(factor, 6);
ch->scale_factors[i] = factor;
}
} 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;
}
const 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 },
};
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