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ffmpeg/libavcodec/rka.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* RKA decoder
* Copyright (c) 2023 Paul B Mahol
*
* 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/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "bytestream.h"
#include "decode.h"
typedef struct ACoder {
GetByteContext gb;
uint32_t low, high;
uint32_t value;
} ACoder;
typedef struct FiltCoeffs {
int32_t coeffs[257];
unsigned size;
} FiltCoeffs;
typedef struct Model64 {
uint32_t zero[2];
uint32_t sign[2];
unsigned size;
int bits;
uint16_t val4[65];
uint16_t val1[65];
} Model64;
typedef struct AdaptiveModel {
int last;
int total;
int buf_size;
int16_t sum;
uint16_t aprob0;
uint16_t aprob1;
uint16_t *prob[2];
} AdaptiveModel;
typedef struct ChContext {
int qfactor;
int vrq;
int last_nb_decoded;
unsigned srate_pad;
unsigned pos_idx;
AdaptiveModel *filt_size;
AdaptiveModel *filt_bits;
uint32_t *bprob[2];
AdaptiveModel position;
AdaptiveModel fshift;
AdaptiveModel nb_segments;
AdaptiveModel coeff_bits[11];
Model64 mdl64[4][11];
int32_t buf0[131072+2560];
int32_t buf1[131072+2560];
} ChContext;
typedef struct RKAContext {
AVClass *class;
ACoder ac;
ChContext ch[2];
int bps;
int align;
int channels;
int correlated;
int frame_samples;
int last_nb_samples;
uint32_t total_nb_samples;
uint32_t samples_left;
uint32_t bprob[2][257];
AdaptiveModel filt_size;
AdaptiveModel filt_bits;
} RKAContext;
static int adaptive_model_init(AdaptiveModel *am, int buf_size)
{
am->buf_size = buf_size;
am->sum = 2000;
am->aprob0 = 0;
am->aprob1 = 0;
am->total = 0;
if (!am->prob[0])
am->prob[0] = av_malloc_array(buf_size + 5, sizeof(*am->prob[0]));
if (!am->prob[1])
am->prob[1] = av_malloc_array(buf_size + 5, sizeof(*am->prob[1]));
if (!am->prob[0] || !am->prob[1])
return AVERROR(ENOMEM);
memset(am->prob[0], 0, (buf_size + 5) * sizeof(*am->prob[0]));
memset(am->prob[1], 0, (buf_size + 5) * sizeof(*am->prob[1]));
return 0;
}
static void adaptive_model_free(AdaptiveModel *am)
{
av_freep(&am->prob[0]);
av_freep(&am->prob[1]);
}
static av_cold int rka_decode_init(AVCodecContext *avctx)
{
RKAContext *s = avctx->priv_data;
int qfactor;
if (avctx->extradata_size < 16)
return AVERROR_INVALIDDATA;
s->bps = avctx->bits_per_raw_sample = avctx->extradata[13];
switch (s->bps) {
case 8:
avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
break;
case 16:
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
break;
default:
return AVERROR_INVALIDDATA;
}
av_channel_layout_uninit(&avctx->ch_layout);
s->channels = avctx->ch_layout.nb_channels = avctx->extradata[12];
if (s->channels < 1 || s->channels > 2)
return AVERROR_INVALIDDATA;
s->align = (s->channels * (avctx->bits_per_raw_sample >> 3));
s->samples_left = s->total_nb_samples = (AV_RL32(avctx->extradata + 4)) / s->align;
s->frame_samples = 131072 / s->align;
s->last_nb_samples = s->total_nb_samples % s->frame_samples;
s->correlated = avctx->extradata[15] & 1;
qfactor = avctx->extradata[14] & 0xf;
if ((avctx->extradata[15] & 4) != 0)
qfactor = -qfactor;
s->ch[0].qfactor = s->ch[1].qfactor = qfactor < 0 ? 2 : qfactor;
s->ch[0].vrq = qfactor < 0 ? -qfactor : 0;
s->ch[1].vrq = qfactor < 0 ? -qfactor : 0;
if (qfactor < 0) {
s->ch[0].vrq = av_clip(s->ch[0].vrq, 1, 8);
s->ch[1].vrq = av_clip(s->ch[1].vrq, 1, 8);
}
av_log(avctx, AV_LOG_DEBUG, "qfactor: %d\n", qfactor);
return 0;
}
static void model64_init(Model64 *m, unsigned bits)
{
unsigned x;
m->bits = bits;
m->size = 64;
m->zero[0] = 1;
x = (1 << (bits >> 1)) + 3;
x = FFMIN(x, 20);
m->zero[1] = x;
m->sign[0] = 1;
m->sign[1] = 1;
for (int i = 0; i < FF_ARRAY_ELEMS(m->val4); i++) {
m->val4[i] = 4;
m->val1[i] = 1;
}
}
static int chctx_init(RKAContext *s, ChContext *c,
int sample_rate, int bps)
{
int ret;
memset(c->buf0, 0, sizeof(c->buf0));
memset(c->buf1, 0, sizeof(c->buf1));
c->filt_size = &s->filt_size;
c->filt_bits = &s->filt_bits;
c->bprob[0] = s->bprob[0];
c->bprob[1] = s->bprob[1];
c->srate_pad = ((int64_t)sample_rate << 13) / 44100 & 0xFFFFFFFCU;
c->pos_idx = 1;
for (int i = 0; i < FF_ARRAY_ELEMS(s->bprob[0]); i++)
c->bprob[0][i] = c->bprob[1][i] = 1;
for (int i = 0; i < 11; i++) {
ret = adaptive_model_init(&c->coeff_bits[i], 32);
if (ret < 0)
return ret;
model64_init(&c->mdl64[0][i], i);
model64_init(&c->mdl64[1][i], i);
model64_init(&c->mdl64[2][i], i+1);
model64_init(&c->mdl64[3][i], i+1);
}
ret = adaptive_model_init(c->filt_size, 256);
if (ret < 0)
return ret;
ret = adaptive_model_init(c->filt_bits, 16);
if (ret < 0)
return ret;
ret = adaptive_model_init(&c->position, 16);
if (ret < 0)
return ret;
ret = adaptive_model_init(&c->nb_segments, 8);
if (ret < 0)
return ret;
return adaptive_model_init(&c->fshift, 32);
}
static void init_acoder(ACoder *ac)
{
ac->low = 0x0;
ac->high = 0xffffffff;
ac->value = bytestream2_get_be32(&ac->gb);
}
static int ac_decode_bool(ACoder *ac, int freq1, int freq2)
{
unsigned help, add, high, value;
int low;
low = ac->low;
help = ac->high / (unsigned)(freq2 + freq1);
value = ac->value;
add = freq1 * help;
ac->high = help;
if (value - low >= add) {
ac->low = low = add + low;
ac->high = high = freq2 * help;
while (1) {
if ((low ^ (high + low)) > 0xFFFFFF) {
if (high > 0xFFFF)
return 1;
ac->high = (uint16_t)-(int16_t)low;
}
if (bytestream2_get_bytes_left(&ac->gb) <= 0)
break;
ac->value = bytestream2_get_byteu(&ac->gb) | (ac->value << 8);
ac->high = high = ac->high << 8;
low = ac->low = ac->low << 8;
}
return -1;
}
ac->high = add;
while (1) {
if ((low ^ (add + low)) > 0xFFFFFF) {
if (add > 0xFFFF)
return 0;
ac->high = (uint16_t)-(int16_t)low;
}
if (bytestream2_get_bytes_left(&ac->gb) <= 0)
break;
ac->value = bytestream2_get_byteu(&ac->gb) | (ac->value << 8);
ac->high = add = ac->high << 8;
low = ac->low = ac->low << 8;
}
return -1;
}
static int decode_bool(ACoder *ac, ChContext *c, int idx)
{
uint32_t x;
int b;
x = c->bprob[0][idx];
if (x + c->bprob[1][idx] > 4096) {
c->bprob[0][idx] = (x >> 1) + 1;
c->bprob[1][idx] = (c->bprob[1][idx] >> 1) + 1;
}
b = ac_decode_bool(ac, c->bprob[0][idx], c->bprob[1][idx]);
if (b < 0)
return b;
c->bprob[b][idx]++;
return b;
}
static int ac_get_freq(ACoder *ac, unsigned freq, int *result)
{
uint32_t new_high;
if (freq == 0)
return -1;
new_high = ac->high / freq;
ac->high = new_high;
if (new_high == 0)
return -1;
*result = (ac->value - ac->low) / new_high;
return 0;
}
static int ac_update(ACoder *ac, int freq, int mul)
{
uint32_t low, high;
low = ac->low = ac->high * freq + ac->low;
high = ac->high = ac->high * mul;
while (1) {
if (((high + low) ^ low) > 0xffffff) {
if (high > 0xffff)
return 0;
ac->high = (uint16_t)-(int16_t)low;
}
if (bytestream2_get_bytes_left(&ac->gb) <= 0)
break;
ac->value = (ac->value << 8) | bytestream2_get_byteu(&ac->gb);
low = ac->low = ac->low << 8;
high = ac->high = ac->high << 8;
}
return -1;
}
static void amdl_update_prob(AdaptiveModel *am, int val, int diff)
{
am->aprob0 += diff;
if (val <= 0) {
am->prob[0][0] += diff;
} else {
do {
am->prob[0][val] += diff;
val += (val & -val);
} while (val < am->buf_size);
}
}
static void update_ch_subobj(AdaptiveModel *am)
{
int idx2, idx = am->buf_size - 1;
if (idx >= 0) {
do {
uint16_t *prob = am->prob[0];
int diff, prob_idx = prob[idx];
idx2 = idx - 1;
if (idx > 0) {
int idx3 = idx - 1;
if ((idx2 & idx) != idx2) {
do {
prob_idx -= prob[idx3];
idx3 &= idx3 - 1;
} while ((idx2 & idx) != idx3);
}
}
diff = ((prob_idx > 0) - prob_idx) >> 1;
amdl_update_prob(am, idx, diff);
idx--;
} while (idx2 >= 0);
}
if (am->sum < 8000)
am->sum += 200;
am->aprob1 = (am->aprob1 + 1) >> 1;
}
static int amdl_decode_int(AdaptiveModel *am, ACoder *ac, unsigned *dst, unsigned size)
{
unsigned freq, size2, val, mul;
int j;
size = FFMIN(size, am->buf_size - 1);
if (am->aprob0 >= am->sum)
update_ch_subobj(am);
if (am->aprob1 && (am->total == am->buf_size ||
ac_decode_bool(ac, am->aprob0, am->aprob1) == 0)) {
if (am->total <= 1) {
dst[0] = am->last;
amdl_update_prob(am, dst[0], 1);
return 0;
}
if (size == am->buf_size - 1) {
freq = am->aprob0;
} else {
freq = am->prob[0][0];
for (int j = size; j > 0; j &= (j - 1) )
freq += am->prob[0][j];
}
ac_get_freq(ac, freq, &freq);
size2 = am->buf_size >> 1;
val = am->prob[0][0];
if (freq >= val) {
int sum = 0;
for (j = freq - val; size2; size2 >>= 1) {
unsigned v = am->prob[0][size2 + sum];
if (j >= v) {
sum += size2;
j -= v;
}
}
freq -= j;
val = sum + 1;
} else {
freq = 0;
val = 0;
}
dst[0] = val;
mul = am->prob[0][val];
if (val > 0) {
for (int k = val - 1; (val & (val - 1)) != k; k &= k - 1)
mul -= am->prob[0][k];
}
ac_update(ac, freq, mul);
amdl_update_prob(am, dst[0], 1);
return 0;
}
am->aprob1++;
if (size == am->buf_size - 1) {
ac_get_freq(ac, am->buf_size - am->total, &val);
} else {
freq = 1;
for (dst[0] = 0; dst[0] < size; dst[0]++) {
if (!am->prob[1][dst[0]])
freq++;
}
ac_get_freq(ac, freq, &val);
}
freq = 0;
dst[0] = 0;
if (val > 0 && am->buf_size > 0) {
for (dst[0] = 0; dst[0] < size & freq < val; dst[0]++) {
if (!am->prob[1][dst[0]])
freq++;
}
}
if (am->prob[1][dst[0]]) {
do {
val = dst[0]++;
} while (val + 1 < am->buf_size && am->prob[1][val + 1]);
}
ac_update(ac, freq, 1);
am->prob[1][dst[0]]++;
am->total++;
amdl_update_prob(am, dst[0], 1);
am->last = dst[0];
return 0;
}
static int decode_filt_coeffs(RKAContext *s, ChContext *ctx, ACoder *ac, FiltCoeffs *dst)
{
unsigned val, bits;
int idx = 0;
if (amdl_decode_int(ctx->filt_size, ac, &dst->size, 256) < 0)
return -1;
if (dst->size == 0)
return 0;
if (amdl_decode_int(ctx->filt_bits, ac, &bits, 10) < 0)
return -1;
do {
if (((idx == 8) || (idx == 20)) && (0 < bits))
bits--;
if (bits > 10)
return -1;
if (amdl_decode_int(&ctx->coeff_bits[bits], ac, &val, 31) < 0)
return -1;
if (val == 31) {
ac_get_freq(ac, 65536, &val);
ac_update(ac, val, 1);
}
if (val == 0) {
dst->coeffs[idx++] = 0;
} else {
unsigned freq = 0;
int sign;
if (bits > 0) {
ac_get_freq(ac, 1 << bits, &freq);
ac_update(ac, freq, 1);
}
dst->coeffs[idx] = freq + 1 + ((val - 1U) << bits);
sign = decode_bool(ac, ctx, idx);
if (sign < 0)
return -1;
if (sign == 1)
dst->coeffs[idx] = -dst->coeffs[idx];
idx++;
}
} while (idx < dst->size);
return 0;
}
static int ac_dec_bit(ACoder *ac)
{
uint32_t high, low;
low = ac->low;
ac->high = high = ac->high >> 1;
if (ac->value - low < high) {
do {
if (((high + low) ^ low) > 0xffffff) {
if (high > 0xffff)
return 0;
ac->high = (uint16_t)-(int16_t)low;
}
if (bytestream2_get_bytes_left(&ac->gb) <= 0)
break;
ac->value = (ac->value << 8) | bytestream2_get_byteu(&ac->gb);
ac->high = high = ac->high << 8;
ac->low = low = ac->low << 8;
} while (1);
return -1;
}
ac->low = low = low + high;
do {
if (((high + low) ^ low) > 0xffffff) {
if (high > 0xffff)
return 1;
ac->high = (uint16_t)-(int16_t)low;
}
if (bytestream2_get_bytes_left(&ac->gb) <= 0)
break;
ac->value = (ac->value << 8) | bytestream2_get_byteu(&ac->gb);
ac->high = high = ac->high << 8;
ac->low = low = ac->low << 8;
} while (1);
return -1;
}
static int mdl64_decode(ACoder *ac, Model64 *ctx, int *dst)
{
int sign, idx, bits;
unsigned val = 0;
if (ctx->zero[0] + ctx->zero[1] > 4000U) {
ctx->zero[0] = (ctx->zero[0] >> 1) + 1;
ctx->zero[1] = (ctx->zero[1] >> 1) + 1;
}
if (ctx->sign[0] + ctx->sign[1] > 4000U) {
ctx->sign[0] = (ctx->sign[0] >> 1) + 1;
ctx->sign[1] = (ctx->sign[1] >> 1) + 1;
}
sign = ac_decode_bool(ac, ctx->zero[0], ctx->zero[1]);
if (sign == 0) {
ctx->zero[0] += 2;
dst[0] = 0;
return 0;
} else if (sign < 0) {
return -1;
}
ctx->zero[1] += 2;
sign = ac_decode_bool(ac, ctx->sign[0], ctx->sign[1]);
if (sign < 0)
return -1;
ctx->sign[sign]++;
bits = ctx->bits;
if (bits > 0) {
if (bits < 13) {
ac_get_freq(ac, 1 << bits, &val);
ac_update(ac, val, 1);
} else {
int hbits = bits / 2;
ac_get_freq(ac, 1 << hbits, &val);
ac_update(ac, val, 1);
ac_get_freq(ac, 1 << (ctx->bits - (hbits)), &bits);
ac_update(ac, val, 1);
val += (bits << hbits);
}
}
bits = ctx->size;
idx = 0;
if (bits >= 0) {
do {
uint16_t *val4 = ctx->val4;
int b;
if (val4[idx] + ctx->val1[idx] > 2000U) {
val4[idx] = (val4[idx] >> 1) + 1;
ctx->val1[idx] = (ctx->val1[idx] >> 1) + 1;
}
b = ac_decode_bool(ac, ctx->val4[idx], ctx->val1[idx]);
if (b == 1) {
ctx->val1[idx] += 4;
break;
} else if (b < 0) {
return -1;
}
ctx->val4[idx] += 4;
idx++;
} while (idx <= ctx->size);
bits = ctx->size;
if (idx <= bits) {
dst[0] = val + 1 + (idx << ctx->bits);
if (sign)
dst[0] = -dst[0];
return 0;
}
}
bits++;
while (ac_dec_bit(ac) == 0)
bits += 64;
ac_get_freq(ac, 64, &idx);
ac_update(ac, idx, 1);
idx += bits;
dst[0] = val + 1 + (idx << ctx->bits);
if (sign)
dst[0] = -dst[0];
return 0;
}
static const uint8_t vrq_qfactors[8] = { 3, 3, 2, 2, 1, 1, 1, 1 };
static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, unsigned size)
{
FiltCoeffs filt;
Model64 *mdl64;
int split, val, last_val = 0, ret;
unsigned rsize, idx = 3, bits = 0, m = 0;
if (ctx->qfactor == 0) {
if (amdl_decode_int(&ctx->fshift, ac, &bits, 15) < 0)
return -1;
bits &= 31U;
}
ret = decode_filt_coeffs(s, ctx, ac, &filt);
if (ret < 0)
return ret;
if (size < 512)
split = size / 2;
else
split = size >> 4;
if (size <= 1)
return 0;
for (int x = 0; x < size;) {
if (amdl_decode_int(&ctx->position, ac, &idx, 10) < 0)
return -1;
m = 0;
idx = (ctx->pos_idx + idx) % 11;
ctx->pos_idx = idx;
rsize = FFMIN(split, size - x);
for (int y = 0; y < rsize; y++, off++) {
int midx, shift = idx, *src, sum = 16;
if (off >= FF_ARRAY_ELEMS(ctx->buf0))
return -1;
midx = FFABS(last_val) >> shift;
if (midx >= 15) {
mdl64 = &ctx->mdl64[3][idx];
} else if (midx >= 7) {
mdl64 = &ctx->mdl64[2][idx];
} else if (midx >= 4) {
mdl64 = &ctx->mdl64[1][idx];
} else {
mdl64 = &ctx->mdl64[0][idx];
}
ret = mdl64_decode(ac, mdl64, &val);
if (ret < 0)
return -1;
last_val = val;
src = &ctx->buf1[off + -1];
for (int i = 0; i < filt.size && i < 15; i++)
sum += filt.coeffs[i] * (unsigned)src[-i];
sum = sum * 2U;
for (int i = 15; i < filt.size; i++)
sum += filt.coeffs[i] * (unsigned)src[-i];
sum = sum >> 6;
if (ctx->qfactor == 0) {
if (bits == 0) {
ctx->buf1[off] = sum + val;
} else {
ctx->buf1[off] = (val + (sum >> bits)) * (1U << bits) +
(((1U << bits) - 1U) & ctx->buf1[off + -1]);
}
ctx->buf0[off] = ctx->buf1[off] + (unsigned)ctx->buf0[off + -1];
} else {
val *= 1U << ctx->qfactor;
sum += ctx->buf0[off + -1] + (unsigned)val;
switch (s->bps) {
case 16: sum = av_clip_int16(sum); break;
case 8: sum = av_clip_int8(sum); break;
}
ctx->buf1[off] = sum - ctx->buf0[off + -1];
ctx->buf0[off] = sum;
m += (unsigned)FFABS(ctx->buf1[off]);
}
}
if (ctx->vrq != 0) {
int sum = 0;
for (unsigned i = (m << 6) / rsize; i > 0; i = i >> 1)
sum++;
sum -= (ctx->vrq + 7);
ctx->qfactor = FFMAX(sum, vrq_qfactors[ctx->vrq - 1]);
}
x += split;
}
return 0;
}
static int decode_samples(AVCodecContext *avctx, ACoder *ac, ChContext *ctx, int offset)
{
RKAContext *s = avctx->priv_data;
int segment_size, offset2, mode, ret;
ret = amdl_decode_int(&ctx->nb_segments, ac, &mode, 5);
if (ret < 0)
return ret;
if (mode == 5) {
ret = ac_get_freq(ac, ctx->srate_pad >> 2, &segment_size);
if (ret < 0)
return ret;
ac_update(ac, segment_size, 1);
segment_size *= 4;
ret = decode_filter(s, ctx, ac, offset, segment_size);
if (ret < 0)
return ret;
} else {
segment_size = ctx->srate_pad;
if (mode) {
if (mode > 2) {
ret = decode_filter(s, ctx, ac, offset, segment_size / 4);
if (ret < 0)
return ret;
offset2 = segment_size / 4 + offset;
ret = decode_filter(s, ctx, ac, offset2, segment_size / 4);
if (ret < 0)
return ret;
offset2 = segment_size / 4 + offset2;
} else {
ret = decode_filter(s, ctx, ac, offset, segment_size / 2);
if (ret < 0)
return ret;
offset2 = segment_size / 2 + offset;
}
if (mode & 1) {
ret = decode_filter(s, ctx, ac, offset2, segment_size / 2);
if (ret < 0)
return ret;
} else {
ret = decode_filter(s, ctx, ac, offset2, segment_size / 4);
if (ret < 0)
return ret;
ret = decode_filter(s, ctx, ac, segment_size / 4 + offset2, segment_size / 4);
if (ret < 0)
return ret;
}
} else {
ret = decode_filter(s, ctx, ac, offset, ctx->srate_pad);
if (ret < 0)
return ret;
}
}
return segment_size;
}
static int decode_ch_samples(AVCodecContext *avctx, ChContext *c)
{
RKAContext *s = avctx->priv_data;
ACoder *ac = &s->ac;
int nb_decoded = 0;
if (bytestream2_get_bytes_left(&ac->gb) <= 0)
return 0;
memmove(c->buf0, &c->buf0[c->last_nb_decoded], 2560 * sizeof(*c->buf0));
memmove(c->buf1, &c->buf1[c->last_nb_decoded], 2560 * sizeof(*c->buf1));
nb_decoded = decode_samples(avctx, ac, c, 2560);
if (nb_decoded < 0)
return nb_decoded;
c->last_nb_decoded = nb_decoded;
return nb_decoded;
}
static int rka_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *avpkt)
{
RKAContext *s = avctx->priv_data;
ACoder *ac = &s->ac;
int ret;
bytestream2_init(&ac->gb, avpkt->data, avpkt->size);
init_acoder(ac);
for (int ch = 0; ch < s->channels; ch++) {
ret = chctx_init(s, &s->ch[ch], avctx->sample_rate,
avctx->bits_per_raw_sample);
if (ret < 0)
return ret;
}
frame->nb_samples = s->frame_samples;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
if (s->channels == 2 && s->correlated) {
int16_t *l16 = (int16_t *)frame->extended_data[0];
int16_t *r16 = (int16_t *)frame->extended_data[1];
uint8_t *l8 = frame->extended_data[0];
uint8_t *r8 = frame->extended_data[1];
for (int n = 0; n < frame->nb_samples;) {
ret = decode_ch_samples(avctx, &s->ch[0]);
if (ret == 0) {
frame->nb_samples = n;
break;
}
if (ret < 0 || n + ret > frame->nb_samples)
return AVERROR_INVALIDDATA;
ret = decode_ch_samples(avctx, &s->ch[1]);
if (ret == 0) {
frame->nb_samples = n;
break;
}
if (ret < 0 || n + ret > frame->nb_samples)
return AVERROR_INVALIDDATA;
switch (avctx->sample_fmt) {
case AV_SAMPLE_FMT_S16P:
for (int i = 0; i < ret; i++) {
int l = s->ch[0].buf0[2560 + i];
int r = s->ch[1].buf0[2560 + i];
l16[n + i] = (l * 2 + r + 1) >> 1;
r16[n + i] = (l * 2 - r + 1) >> 1;
}
break;
case AV_SAMPLE_FMT_U8P:
for (int i = 0; i < ret; i++) {
int l = s->ch[0].buf0[2560 + i];
int r = s->ch[1].buf0[2560 + i];
l8[n + i] = ((l * 2 + r + 1) >> 1) + 0x7f;
r8[n + i] = ((l * 2 - r + 1) >> 1) + 0x7f;
}
break;
default:
return AVERROR_INVALIDDATA;
}
n += ret;
}
} else {
for (int n = 0; n < frame->nb_samples;) {
for (int ch = 0; ch < s->channels; ch++) {
int16_t *m16 = (int16_t *)frame->data[ch];
uint8_t *m8 = frame->data[ch];
ret = decode_ch_samples(avctx, &s->ch[ch]);
if (ret == 0) {
frame->nb_samples = n;
break;
}
if (ret < 0 || n + ret > frame->nb_samples)
return AVERROR_INVALIDDATA;
switch (avctx->sample_fmt) {
case AV_SAMPLE_FMT_S16P:
for (int i = 0; i < ret; i++) {
int m = s->ch[ch].buf0[2560 + i];
m16[n + i] = m;
}
break;
case AV_SAMPLE_FMT_U8P:
for (int i = 0; i < ret; i++) {
int m = s->ch[ch].buf0[2560 + i];
m8[n + i] = m + 0x7f;
}
break;
default:
return AVERROR_INVALIDDATA;
}
}
n += ret;
}
}
if (frame->nb_samples < s->frame_samples &&
frame->nb_samples > s->last_nb_samples)
frame->nb_samples = s->last_nb_samples;
*got_frame_ptr = 1;
return avpkt->size;
}
static av_cold int rka_decode_close(AVCodecContext *avctx)
{
RKAContext *s = avctx->priv_data;
for (int ch = 0; ch < 2; ch++) {
ChContext *c = &s->ch[ch];
for (int i = 0; i < 11; i++)
adaptive_model_free(&c->coeff_bits[i]);
adaptive_model_free(&c->position);
adaptive_model_free(&c->nb_segments);
adaptive_model_free(&c->fshift);
}
adaptive_model_free(&s->filt_size);
adaptive_model_free(&s->filt_bits);
return 0;
}
const FFCodec ff_rka_decoder = {
.p.name = "rka",
CODEC_LONG_NAME("RKA (RK Audio)"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_RKA,
.priv_data_size = sizeof(RKAContext),
.init = rka_decode_init,
.close = rka_decode_close,
FF_CODEC_DECODE_CB(rka_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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