/*
* Infinity IMM4 decoder
*
* Copyright (c) 2018 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/thread.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "copy_block.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
typedef struct IMM4Context {
BswapDSPContext bdsp;
GetBitContext gb;
AVFrame *prev_frame;
uint8_t *bitstream;
int bitstream_size;
int factor;
unsigned lo;
unsigned hi;
ScanTable intra_scantable;
DECLARE_ALIGNED(32, int16_t, block)[6][64];
IDCTDSPContext idsp;
} IMM4Context;
static const uint8_t intra_cb[] = {
24, 18, 12
};
static const uint8_t inter_cb[] = {
30, 20, 15
};
static const uint8_t cbplo_symbols[] = {
3, 4, 19, 20, 35, 36, 51, 52
};
static const uint8_t cbplo_bits[] = {
1, 4, 3, 6, 3, 6, 3, 6
};
static const uint8_t cbplo_codes[] = {
1, 1, 1, 1, 2, 2, 3, 3
};
static const uint8_t cbphi_bits[] = {
4, 5, 5, 4, 5, 4, 6, 4, 5, 6, 4, 4, 4, 4, 4, 2
};
static const uint8_t cbphi_codes[] = {
3, 5, 4, 9, 3, 7, 2, 11, 2, 3, 5, 10, 4, 8, 6, 3
};
static const uint8_t blktype_symbols[] = {
0, 1, 2, 3, 4, 16, 17, 18, 19, 20, 32, 33, 34, 35, 48, 50, 51, 52
};
static const uint8_t blktype_bits[] = {
1, 3, 3, 5, 6, 4, 7, 7, 8, 9, 4, 7, 7, 8, 6, 8, 7, 9
};
static const uint8_t blktype_codes[] = {
1, 3, 2, 3, 4, 3, 7, 5, 4, 4, 2, 6, 4, 3, 5, 5, 3, 2
};
static const uint16_t block_symbols[] = {
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0x81, 0x82, 0x83,
0x84, 0x85, 0x86, 0x101, 0x102, 0x103, 0x104, 0x181, 0x182, 0x183, 0x201, 0x202,
0x203, 0x281, 0x282, 0x283, 0x301, 0x302, 0x303, 0x381, 0x382, 0x401, 0x402,
0x481, 0x482, 0x501, 0x502, 0x581, 0x601, 0x681, 0x701, 0x781, 0x801, 0x881,
0x901, 0x981, 0xA01, 0xA81, 0xB01, 0xB81, 0xC01, 0xC81, 0xD01, 0x4001, 0x4002,
0x4003, 0x4081, 0x4082, 0x4101, 0x4181, 0x4201, 0x4281, 0x4301, 0x4381, 0x4401,
0x4481, 0x4501, 0x4581, 0x4601, 0x4681, 0x4701, 0x4781, 0x4801, 0x4881, 0x4901,
0x4981, 0x4A01, 0x4A81, 0x4B01, 0x4B81, 0x4C01, 0x4C81, 0x4D01, 0x4D81, 0x4E01,
0x4E81, 0x4F01, 0x4F81, 0x5001, 0x5081, 0x5101, 0x5181, 0x5201, 0x5281, 0x5301,
0x5381, 0x5401
};
static const uint8_t block_bits[] = {
7, 2, 4, 6, 7, 8, 9, 9, 10, 10, 11, 11, 11, 3, 6, 8, 10, 11, 12, 4, 8,
10, 12, 5, 9, 10, 5, 9, 12, 5, 10, 12, 6, 10, 12, 6, 10, 6, 10, 6,
10, 7, 12, 7, 7, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 11, 11, 12, 12, 4, 9,
11, 6, 11, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9,
9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12,
12, 12
};
static const uint8_t block_codes[] = {
3, 2, 15, 21, 23, 31, 37, 36, 33, 32, 7, 6, 32, 6, 20, 30, 15, 33, 80,
14, 29, 14, 81, 13, 35, 13, 12, 34, 82, 11, 12, 83, 19, 11, 84, 18,
10, 17, 9, 16, 8, 22, 85, 21, 20, 28, 27, 33, 32, 31, 30, 29, 28,
27, 26, 34, 35, 86, 87, 7, 25, 5, 15, 4, 14, 13, 12, 19, 18, 17, 16,
26, 25, 24, 23, 22, 21, 20, 19, 24, 23, 22, 21, 20, 19, 18, 17, 7,
6, 5, 4, 36, 37, 38, 39, 88, 89, 90, 91, 92, 93, 94, 95
};
static VLC cbplo_tab;
static VLC cbphi_tab;
static VLC blktype_tab;
static VLC block_tab;
static int get_cbphi(GetBitContext *gb, int x)
{
int value;
value = get_vlc2(gb, cbphi_tab.table, cbphi_tab.bits, 1);
if (value < 0)
return AVERROR_INVALIDDATA;
return x ? value : 15 - value;
}
static int decode_block(AVCodecContext *avctx, GetBitContext *gb,
int block, int factor, int flag, int offset, int flag2)
{
IMM4Context *s = avctx->priv_data;
const uint8_t *scantable = s->intra_scantable.permutated;
int i, last, len, factor2;
for (i = !flag; i < 64; i++) {
int value;
value = get_vlc2(gb, block_tab.table, block_tab.bits, 1);
if (value < 0)
return AVERROR_INVALIDDATA;
if (value == 0) {
last = get_bits1(gb);
len = get_bits(gb, 6);
factor2 = get_sbits(gb, 8);
} else {
factor2 = value & 0x7F;
last = (value >> 14) & 1;
len = (value >> 7) & 0x3F;
if (get_bits1(gb))
factor2 = -factor2;
}
i += len;
if (i >= 64)
break;
s->block[block][scantable[i]] = offset * (factor2 < 0 ? -1 : 1) + factor * factor2;
if (last)
break;
}
if (s->hi == 2 && flag2 && block < 4) {
if (flag)
s->block[block][scantable[0]] *= 2;
s->block[block][scantable[1]] *= 2;
s->block[block][scantable[8]] *= 2;
s->block[block][scantable[16]] *= 2;
}
return 0;
}
static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb,
unsigned cbp, int flag, int offset, unsigned flag2)
{
IMM4Context *s = avctx->priv_data;
const uint8_t *scantable = s->intra_scantable.permutated;
int ret, i;
memset(s->block, 0, sizeof(s->block));
for (i = 0; i < 6; i++) {
if (!flag) {
int x = get_bits(gb, 8);
if (x == 255)
x = 128;
x *= 8;
s->block[i][scantable[0]] = x;
}
if (cbp & (1 << (5 - i))) {
ret = decode_block(avctx, gb, i, s->factor, flag, offset, flag2);
if (ret < 0)
return ret;
}
}
return 0;
}
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
{
IMM4Context *s = avctx->priv_data;
int ret, x, y, offset = 0;
if (s->hi == 0) {
if (s->lo > 2)
return AVERROR_INVALIDDATA;
s->factor = intra_cb[s->lo];
} else {
s->factor = s->lo * 2;
}
if (s->hi) {
offset = s->factor;
offset >>= 1;
if (!(offset & 1))
offset--;
}
for (y = 0; y < avctx->height; y += 16) {
for (x = 0; x < avctx->width; x += 16) {
unsigned flag, cbphi, cbplo;
cbplo = get_vlc2(gb, cbplo_tab.table, cbplo_tab.bits, 1) >> 4;
flag = get_bits1(gb);
cbphi = get_cbphi(gb, 1);
ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset, flag);
if (ret < 0)
return ret;
s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
frame->linesize[0], s->block[0]);
s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[1]);
s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
frame->linesize[0], s->block[2]);
s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[3]);
s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
frame->linesize[1], s->block[4]);
s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
frame->linesize[2], s->block[5]);
}
}
return 0;
}
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
AVFrame *frame, AVFrame *prev)
{
IMM4Context *s = avctx->priv_data;
int ret, x, y, offset = 0;
if (s->hi == 0) {
if (s->lo > 2)
return AVERROR_INVALIDDATA;
s->factor = inter_cb[s->lo];
} else {
s->factor = s->lo * 2;
}
if (s->hi) {
offset = s->factor;
offset >>= 1;
if (!(offset & 1))
offset--;
}
for (y = 0; y < avctx->height; y += 16) {
for (x = 0; x < avctx->width; x += 16) {
int reverse, intra_block, value;
unsigned cbphi, cbplo, flag2 = 0;
if (get_bits1(gb)) {
copy_block16(frame->data[0] + y * frame->linesize[0] + x,
prev->data[0] + y * prev->linesize[0] + x,
frame->linesize[0], prev->linesize[0], 16);
copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
frame->linesize[1], prev->linesize[1], 8);
copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
frame->linesize[2], prev->linesize[2], 8);
continue;
}
value = get_vlc2(gb, blktype_tab.table, blktype_tab.bits, 1);
if (value < 0)
return AVERROR_INVALIDDATA;
intra_block = value & 0x07;
reverse = intra_block == 3;
if (reverse)
flag2 = get_bits1(gb);
cbplo = value >> 4;
cbphi = get_cbphi(gb, reverse);
if (intra_block) {
ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset, flag2);
if (ret < 0)
return ret;
s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
frame->linesize[0], s->block[0]);
s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[1]);
s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
frame->linesize[0], s->block[2]);
s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[3]);
s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
frame->linesize[1], s->block[4]);
s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
frame->linesize[2], s->block[5]);
} else {
flag2 = get_bits1(gb);
skip_bits1(gb);
ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 1, offset, flag2);
if (ret < 0)
return ret;
copy_block16(frame->data[0] + y * frame->linesize[0] + x,
prev->data[0] + y * prev->linesize[0] + x,
frame->linesize[0], prev->linesize[0], 16);
copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
frame->linesize[1], prev->linesize[1], 8);
copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
frame->linesize[2], prev->linesize[2], 8);
s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x,
frame->linesize[0], s->block[0]);
s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[1]);
s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x,
frame->linesize[0], s->block[2]);
s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[3]);
s->idsp.idct_add(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
frame->linesize[1], s->block[4]);
s->idsp.idct_add(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
frame->linesize[2], s->block[5]);
}
}
}
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
IMM4Context *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
AVFrame *frame = data;
int width, height;
unsigned type;
int ret, scaled;
if (avpkt->size <= 32)
return AVERROR_INVALIDDATA;
av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,
FFALIGN(avpkt->size, 4));
if (!s->bitstream)
return AVERROR(ENOMEM);
s->bdsp.bswap_buf((uint32_t *)s->bitstream,
(uint32_t *)avpkt->data,
(avpkt->size + 3) >> 2);
if ((ret = init_get_bits8(gb, s->bitstream, FFALIGN(avpkt->size, 4))) < 0)
return ret;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
avctx->color_range = AVCOL_RANGE_JPEG;
width = avctx->width;
height = avctx->height;
scaled = avpkt->data[8];
if (scaled < 2) {
int mode = avpkt->data[10];
switch (mode) {
case 1:
width = 352;
height = 240;
break;
case 2:
width = 704;
height = 240;
break;
case 4:
width = 480;
height = 704;
break;
case 17:
width = 352;
height = 288;
break;
case 18:
width = 704;
height = 288;
break;
default:
width = 704;
height = 576;
break;
}
}
skip_bits_long(gb, 24 * 8);
type = get_bits_long(gb, 32);
s->hi = get_bits(gb, 16);
s->lo = get_bits(gb, 16);
switch (type) {
case 0x19781977:
frame->key_frame = 1;
frame->pict_type = AV_PICTURE_TYPE_I;
break;
case 0x12250926:
frame->key_frame = 0;
frame->pict_type = AV_PICTURE_TYPE_P;
break;
default:
avpriv_request_sample(avctx, "type %X", type);
return AVERROR_PATCHWELCOME;
}
if (avctx->width != width ||
avctx->height != height) {
if (!frame->key_frame) {
av_log(avctx, AV_LOG_ERROR, "Frame size change is unsupported.\n");
return AVERROR_INVALIDDATA;
}
av_frame_unref(s->prev_frame);
}
ret = ff_set_dimensions(avctx, width, height);
if (ret < 0)
return ret;
if ((ret = ff_get_buffer(avctx, frame, frame->key_frame ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)
return ret;
if (frame->key_frame) {
ret = decode_intra(avctx, gb, frame);
if (ret < 0)
return ret;
av_frame_unref(s->prev_frame);
if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
return ret;
} else {
if (!s->prev_frame->data[0]) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
return AVERROR_INVALIDDATA;
}
ret = decode_inter(avctx, gb, frame, s->prev_frame);
if (ret < 0)
return ret;
}
*got_frame = 1;
return avpkt->size;
}
static av_cold void imm4_init_static_data(void)
{
INIT_VLC_SPARSE_STATIC(&cbplo_tab, 9, FF_ARRAY_ELEMS(cbplo_bits),
cbplo_bits, 1, 1, cbplo_codes, 1, 1, cbplo_symbols, 1, 1, 512);
INIT_VLC_SPARSE_STATIC(&cbphi_tab, 6, FF_ARRAY_ELEMS(cbphi_bits),
cbphi_bits, 1, 1, cbphi_codes, 1, 1, NULL, 0, 0, 64);
INIT_VLC_SPARSE_STATIC(&blktype_tab, 9, FF_ARRAY_ELEMS(blktype_bits),
blktype_bits, 1, 1, blktype_codes, 1, 1, blktype_symbols, 1, 1, 512);
INIT_VLC_SPARSE_STATIC(&block_tab, 12, FF_ARRAY_ELEMS(block_bits),
block_bits, 1, 1, block_codes, 1, 1, block_symbols, 2, 2, 4096);
}
static av_cold int decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
IMM4Context *s = avctx->priv_data;
uint8_t table[64];
for (int i = 0; i < 64; i++)
table[i] = i;
ff_bswapdsp_init(&s->bdsp);
ff_idctdsp_init(&s->idsp, avctx);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, table);
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)
return AVERROR(ENOMEM);
ff_thread_once(&init_static_once, imm4_init_static_data);
return 0;
}
static void decode_flush(AVCodecContext *avctx)
{
IMM4Context *s = avctx->priv_data;
av_frame_unref(s->prev_frame);
}
static av_cold int decode_close(AVCodecContext *avctx)
{
IMM4Context *s = avctx->priv_data;
av_frame_free(&s->prev_frame);
av_freep(&s->bitstream);
s->bitstream_size = 0;
return 0;
}
AVCodec ff_imm4_decoder = {
.name = "imm4",
.long_name = NULL_IF_CONFIG_SMALL("Infinity IMM4"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_IMM4,
.priv_data_size = sizeof(IMM4Context),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.flush = decode_flush,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};