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FFmpeg/libavcodec/imm4.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* 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/mem_internal.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "codec_internal.h"
#include "copy_block.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#define CBPLO_VLC_BITS 6
#define CBPHI_VLC_BITS 6
#define BLKTYPE_VLC_BITS 9
#define BLOCK_VLC_BITS 12
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[][2] = {
{ 0,-6 }, { 0x01, 6 }, { 0x02, 6 }, { 0x03, 6 }, { 0x00, 4 },
{ 0x01, 3 }, { 0x02, 3 }, { 0x03, 3 }, { 0x00, 1 },
};
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[][2] = {
{ 0,-8 }, { 0x34, 9 }, { 0,-9 }, { 0x14, 9 }, { 0,-9 },
{ 0x23, 8 }, { 0x13, 8 }, { 0x32, 8 }, { 0x33, 7 }, { 0x22, 7 },
{ 0x12, 7 }, { 0x21, 7 }, { 0x11, 7 }, { 0x04, 6 }, { 0x30, 6 },
{ 0x03, 5 }, { 0x20, 4 }, { 0x10, 4 }, { 0x02, 3 }, { 0x01, 3 },
{ 0x00, 1 },
};
static const uint16_t block_symbols[] = {
0, 0x4082, 0x4003, 0x000B, 0x000A, 0x4E01, 0x4D81, 0x4D01, 0x4C81,
0x0482, 0x0402, 0x0382, 0x0302, 0x0282, 0x0183, 0x0103, 0x0084, 0x000C,
0x0085, 0x0B81, 0x0C01, 0x4E81, 0x4F01, 0x4F81, 0x5001, 0x0086, 0x0104,
0x0203, 0x0283, 0x0303, 0x0502, 0x0C81, 0x0D01, 0x5081, 0x5101, 0x5181,
0x5201, 0x5281, 0x5301, 0x5381, 0x5401, 0x0000, 0x0009, 0x0008, 0x4C01,
0x4B81, 0x4B01, 0x4A81, 0x4A01, 0x4981, 0x4901, 0x4881, 0x4002, 0x0B01,
0x0A81, 0x0A01, 0x0981, 0x0901, 0x0881, 0x0801, 0x0781, 0x0202, 0x0182,
0x0007, 0x0006, 0x4801, 0x4781, 0x4701, 0x4681, 0x4601, 0x4581, 0x4501,
0x4481, 0x0701, 0x0681, 0x0102, 0x0083, 0x0005, 0x4401, 0x4381, 0x4301,
0x4281, 0x0601, 0x0581, 0x0501, 0x0004, 0x4201, 0x4181, 0x4101, 0x4081,
0x0481, 0x0401, 0x0381, 0x0301, 0x0082, 0x0003, 0x0281, 0x0201, 0x0181,
0x4001, 0x0001, 0x0081, 0x0101, 0x0002,
};
static const uint8_t block_bits[] = {
-9, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11,
11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 7, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 5, 5, 5, 4, 2, 3, 4, 4,
};
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_VLC_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_VLC_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_VLC_BITS, 1);
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_VLC_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_STATIC_FROM_LENGTHS(&cbplo_tab, CBPLO_VLC_BITS, FF_ARRAY_ELEMS(cbplo),
&cbplo[0][1], 2, &cbplo[0][0], 2, 1,
0, 0, 1 << CBPLO_VLC_BITS);
INIT_VLC_SPARSE_STATIC(&cbphi_tab, CBPHI_VLC_BITS, FF_ARRAY_ELEMS(cbphi_bits),
cbphi_bits, 1, 1, cbphi_codes, 1, 1, NULL, 0, 0, 64);
INIT_VLC_STATIC_FROM_LENGTHS(&blktype_tab, BLKTYPE_VLC_BITS, FF_ARRAY_ELEMS(blktype),
&blktype[0][1], 2, &blktype[0][0], 2, 1,
0, 0, 1 << BLKTYPE_VLC_BITS);
INIT_VLC_STATIC_FROM_LENGTHS(&block_tab, BLOCK_VLC_BITS, FF_ARRAY_ELEMS(block_bits),
block_bits, 1, block_symbols, 2, 2,
0, 0, 1 << BLOCK_VLC_BITS);
}
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;
}
const FFCodec ff_imm4_decoder = {
.p.name = "imm4",
.p.long_name = NULL_IF_CONFIG_SMALL("Infinity IMM4"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_IMM4,
.priv_data_size = sizeof(IMM4Context),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.flush = decode_flush,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};
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