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FFmpeg/libavcodec/vqcdec.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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/*
* ViewQuest VQC decoder
* Copyright (C) 2022 Peter Ross
*
* 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 "avcodec.h"
#include "get_bits.h"
#include "codec_internal.h"
#include "decode.h"
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#define VECTOR_VLC_BITS 6
static const uint8_t vector_nbits[] = {
2, 4, 4, 4, 4, 2, 4, 4,
6, 6, 6, 6, 6, 6, 6, 6
};
enum {
SKIP_3 = 0x10,
SKIP_4,
SKIP_5,
SKIP_6,
STOP_RUN,
SIGNED_8BIT,
SIGNED_6BIT
};
/* vector symbols are signed, but returned unsigned by get_vlc2()
codebook indexes are cast as uint8_t in seed_codebook() to compensate */
static const int8_t vector_symbols[] = {
0, SKIP_3, SKIP_4, SKIP_5, SKIP_6, STOP_RUN, 1, -1,
2, 3, 4, SIGNED_8BIT, -2, -3, -4, SIGNED_6BIT
};
static VLCElem vector_vlc[1 << VECTOR_VLC_BITS];
static av_cold void vqc_init_static_data(void)
{
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(vector_vlc, VECTOR_VLC_BITS,
FF_ARRAY_ELEMS(vector_nbits),
vector_nbits, 1,
vector_symbols, 1, 1,
0, 0);
}
typedef struct VqcContext {
AVFrame *frame;
uint8_t * vectors;
int16_t * coeff, *tmp1, *tmp2;
int16_t codebook[4][256];
} VqcContext;
static av_cold int vqc_decode_init(AVCodecContext * avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
VqcContext *s = avctx->priv_data;
if (avctx->width & 15)
return AVERROR_PATCHWELCOME;
s->vectors = av_malloc((avctx->width * avctx->height * 3) / 2);
if (!s->vectors)
return AVERROR(ENOMEM);
s->coeff = av_malloc_array(2 * avctx->width, sizeof(s->coeff[0]));
if (!s->coeff)
return AVERROR(ENOMEM);
s->tmp1 = av_malloc_array(avctx->width / 2, sizeof(s->tmp1[0]));
if (!s->tmp1)
return AVERROR(ENOMEM);
s->tmp2 = av_malloc_array(avctx->width / 2, sizeof(s->tmp2[0]));
if (!s->tmp2)
return AVERROR(ENOMEM);
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
ff_thread_once(&init_static_once, vqc_init_static_data);
return 0;
}
static int seed_pow1(int x)
{
return x >= 1 && x <= 5 ? 1 << x : 0;
}
static int seed_pow2(int x)
{
return x >= 1 && x <= 4 ? 1 << x : 1;
}
static int bias(int x, int c)
{
if (x < 0)
return x - c;
else if (x > 0)
return x + c;
else
return 0;
}
static void seed_codebooks(VqcContext * s, const int * seed)
{
int book1 = -256 * seed[3];
int book2 = -128 * seed[4];
int book3 = -128 * seed[5];
int book4 = -128 * seed[6];
for (int i = -128; i < 128; i++) {
s->codebook[0][(uint8_t)i] = book1;
s->codebook[1][(uint8_t)i] = bias(book2, seed[0]);
s->codebook[2][(uint8_t)i] = bias(book3, seed[1]);
s->codebook[3][(uint8_t)i] = bias(book4, seed[2]);
book1 += 2 * seed[3];
book2 += seed[4];
book3 += seed[5];
book4 += seed[6];
}
}
static int decode_vectors(VqcContext * s, const uint8_t * buf, int size, int width, int height)
{
GetBitContext gb;
uint8_t * vectors = s->vectors;
uint8_t * vectors_end = s->vectors + (width * height * 3) / 2;
memset(vectors, 0, 3 * width * height / 2);
init_get_bits8(&gb, buf, size);
for (int i = 0; i < 3 * width * height / 2 / 32; i++) {
uint8_t * dst = vectors;
int symbol;
*dst++ = get_bits(&gb, 8);
*dst++ = get_bits(&gb, 8);
while (show_bits(&gb, 2) != 2) {
if (dst >= vectors_end - 1)
return 0;
if (get_bits_left(&gb) < 4)
return AVERROR_INVALIDDATA;
if (!show_bits(&gb, 4)) {
*dst++ = 0;
*dst++ = 0;
skip_bits(&gb, 4);
continue;
}
symbol = get_vlc2(&gb, vector_vlc, VECTOR_VLC_BITS, 1);
switch(symbol) {
case SKIP_3: dst += 3; break;
case SKIP_4: dst += 4; break;
case SKIP_5: dst += 5; break;
case SKIP_6: dst += 6; break;
case SIGNED_8BIT: *dst++ = get_sbits(&gb, 8); break;
case SIGNED_6BIT: *dst++ = get_sbits(&gb, 6); break;
default:
*dst++ = symbol;
}
}
skip_bits(&gb, 2);
vectors += 32;
}
return 0;
}
static void load_coeffs(VqcContext * s, const uint8_t * v, int width, int coeff_width)
{
int16_t * c0 = s->coeff;
int16_t * c1 = s->coeff + coeff_width;
int16_t * c0_125 = s->coeff + (coeff_width >> 3);
int16_t * c1_125 = s->coeff + coeff_width + (coeff_width >> 3);
int16_t * c0_25 = s->coeff + (coeff_width >> 2);
int16_t * c1_25 = s->coeff + coeff_width + (coeff_width >> 2);
int16_t * c0_5 = s->coeff + (coeff_width >> 1);
int16_t * c1_5 = s->coeff + coeff_width + (coeff_width >> 1);
for (int i = 0; i < width; i++) {
c0[0] = s->codebook[0][v[0]];
c0[1] = s->codebook[0][v[1]];
c0 += 2;
c1[0] = s->codebook[0][v[2]];
c1[1] = s->codebook[0][v[3]];
c1 += 2;
c0_125[0] = s->codebook[1][v[4]];
c0_125[1] = s->codebook[1][v[5]];
c0_125 += 2;
c1_125[0] = s->codebook[1][v[6]];
c1_125[1] = s->codebook[1][v[7]];
c1_125 += 2;
c0_25[0] = s->codebook[2][v[8]];
c0_25[1] = s->codebook[2][v[9]];
c0_25[2] = s->codebook[2][v[10]];
c0_25[3] = s->codebook[2][v[11]];
c0_25 += 4;
c1_25[0] = s->codebook[2][v[12]];
c1_25[1] = s->codebook[2][v[13]];
c1_25[2] = s->codebook[2][v[14]];
c1_25[3] = s->codebook[2][v[15]];
c1_25 += 4;
if (v[16] | v[17] | v[18] | v[19]) {
c0_5[0] = s->codebook[3][v[16]];
c0_5[1] = s->codebook[3][v[17]];
c0_5[2] = s->codebook[3][v[18]];
c0_5[3] = s->codebook[3][v[19]];
} else {
c0_5[0] = c0_5[1] = c0_5[2] = c0_5[3] = 0;
}
if (v[20] | v[21] | v[22] | v[23]) {
c0_5[4] = s->codebook[3][v[20]];
c0_5[5] = s->codebook[3][v[21]];
c0_5[6] = s->codebook[3][v[22]];
c0_5[7] = s->codebook[3][v[23]];
} else {
c0_5[4] = c0_5[5] = c0_5[6] = c0_5[7] = 0;
}
c0_5 += 8;
if (v[24] | v[25] | v[26] | v[27]) {
c1_5[0] = s->codebook[3][v[24]];
c1_5[1] = s->codebook[3][v[25]];
c1_5[2] = s->codebook[3][v[26]];
c1_5[3] = s->codebook[3][v[27]];
} else {
c1_5[0] = c1_5[1] = c1_5[2] = c1_5[3] = 0;
}
if (v[28] | v[29] | v[30] | v[31]) {
c1_5[4] = s->codebook[3][v[28]];
c1_5[5] = s->codebook[3][v[29]];
c1_5[6] = s->codebook[3][v[30]];
c1_5[7] = s->codebook[3][v[31]];
} else {
c1_5[4] = c1_5[5] = c1_5[6] = c1_5[7] = 0;
}
c1_5 += 8;
v += 32;
}
}
static void transform1(const int16_t * a, const int16_t * b, int16_t * dst, int width)
{
int s0 = a[0] + (b[0] >> 1);
for (int i = 0; i < width / 2 - 1; i++) {
dst[i * 2] = s0;
s0 = a[i + 1] + ((b[i] + b[i + 1]) >> 1);
dst[i * 2 + 1] = ((dst[i * 2] + s0) >> 1) - 2 * b[i];
}
dst[width - 2] = s0;
dst[width - 1] = a[width / 2 - 1] + ((b[width / 2 - 2] - 2 * b[width / 2 - 1]) >> 2) - b[width / 2 - 1];
}
static uint8_t clip(int x)
{
return x >= -128 ? x <= 127 ? x + 0x80 : 0x00 : 0xFF;
}
static void transform2(const int16_t * a, const int16_t * b, uint8_t * dst, int width)
{
int s0 = a[0] + (b[0] >> 1);
int tmp;
for (int i = 0; i < width / 2 - 1; i++) {
dst[i * 2] = av_clip_uint8(s0 + 0x80);
tmp = a[i + 1] + ((b[i] + b[i + 1]) >> 1);
dst[i * 2 + 1] = av_clip_uint8(((tmp + s0) >> 1) - 2 * b[i] + 0x80);
s0 = tmp;
}
dst[width - 2] = clip(s0);
dst[width - 1] = clip(a[width / 2 - 1] + ((b[width / 2 - 2] - 2 * b[width / 2 - 1]) >> 2) - b[width / 2 - 1]);
}
static void decode_strip(VqcContext * s, uint8_t * dst, int stride, int width)
{
const int16_t * coeff;
for (int i = 0; i < width; i++) {
int v0 = s->coeff[i];
int v1 = s->coeff[width + i];
s->coeff[i] = v0 - v1;
s->coeff[width + i] = v0 + v1;
}
coeff = s->coeff;
transform1(coeff, coeff + width / 8, s->tmp1, width / 4);
transform1(s->tmp1, coeff + width / 4, s->tmp2, width / 2);
transform2(s->tmp2, coeff + width / 2, dst, width);
coeff += width;
dst += stride;
transform1(coeff, coeff + width / 8, s->tmp1, width / 4);
transform1(s->tmp1, coeff + width / 4, s->tmp2, width / 2);
transform2(s->tmp2, coeff + width / 2, dst, width);
}
static void decode_frame(VqcContext * s, int width, int height)
{
uint8_t * vectors = s->vectors;
uint8_t * y = s->frame->data[0];
uint8_t * u = s->frame->data[1];
uint8_t * v = s->frame->data[2];
for (int j = 0; j < height / 4; j++) {
load_coeffs(s, vectors, width / 16, width);
decode_strip(s, y, s->frame->linesize[0], width);
vectors += 2 * width;
y += 2 * s->frame->linesize[0];
load_coeffs(s, vectors, width / 32, width / 2);
decode_strip(s, u, s->frame->linesize[1], width / 2);
vectors += width;
u += 2 * s->frame->linesize[1];
load_coeffs(s, vectors, width / 16, width);
decode_strip(s, y, s->frame->linesize[0], width);
vectors += 2 * width;
y += 2 * s->frame->linesize[0];
load_coeffs(s, vectors, width / 32, width / 2);
decode_strip(s, v, s->frame->linesize[2], width / 2);
vectors += width;
v += 2 * s->frame->linesize[2];
}
}
static int vqc_decode_frame(AVCodecContext *avctx, AVFrame * rframe,
int * got_frame, AVPacket * avpkt)
{
VqcContext *s = avctx->priv_data;
int ret;
const uint8_t * buf = avpkt->data;
int cache, seed[7], gamma, contrast;
if (avpkt->size < 7)
return AVERROR_INVALIDDATA;
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return ret;
av_log(avctx, AV_LOG_DEBUG, "VQC%d format\n", (buf[2] & 1) + 1);
if (((buf[0] >> 1) & 7) != 5) {
avpriv_request_sample(avctx, "subversion != 5\n");
return AVERROR_PATCHWELCOME;
}
cache = AV_RL24(buf + 4);
seed[2] = seed_pow1((cache >> 1) & 7);
seed[1] = seed_pow1((cache >> 4) & 7);
seed[0] = seed_pow1((cache >> 7) & 7);
seed[6] = seed_pow2((cache >> 10) & 7);
seed[5] = seed_pow2((cache >> 13) & 7);
seed[4] = seed_pow2((cache >> 16) & 7);
seed[3] = seed_pow2((cache >> 19) & 7);
gamma = buf[0] >> 4;
contrast = AV_RL16(buf + 2) >> 1;
if (gamma || contrast)
avpriv_request_sample(avctx, "gamma=0x%x, contrast=0x%x\n", gamma, contrast);
seed_codebooks(s, seed);
ret = decode_vectors(s, buf + 7, avpkt->size - 7, avctx->width, avctx->height);
if (ret < 0)
return ret;
decode_frame(s, avctx->width, avctx->height);
if ((ret = av_frame_ref(rframe, s->frame)) < 0)
return ret;
*got_frame = 1;
return avpkt->size;
}
static av_cold int vqc_decode_end(AVCodecContext * avctx)
{
VqcContext *s = avctx->priv_data;
av_freep(&s->vectors);
av_freep(&s->coeff);
av_freep(&s->tmp1);
av_freep(&s->tmp2);
av_frame_free(&s->frame);
return 0;
}
const FFCodec ff_vqc_decoder = {
.p.name = "vqc",
CODEC_LONG_NAME("ViewQuest VQC"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_VQC,
.priv_data_size = sizeof(VqcContext),
.init = vqc_decode_init,
.close = vqc_decode_end,
FF_CODEC_DECODE_CB(vqc_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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