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ffmpeg/libavcodec/hqx.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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/*
* Canopus HQX decoder
*
* 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 <inttypes.h>
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "canopus.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "thread.h"
#include "hqx.h"
#include "hqxdsp.h"
/* HQX has four modes - 422, 444, 422alpha and 444alpha - all 12-bit */
enum HQXFormat {
HQX_422 = 0,
HQX_444,
HQX_422A,
HQX_444A,
};
#define HQX_HEADER_SIZE 59
/* macroblock selects a group of 4 possible quants and
* a block can use any of those four quantisers
* one column is powers of 2, the other one is powers of 2 * 3,
* then there is the special one, powers of 2 * 5 */
static const int hqx_quants[16][4] = {
{ 0x1, 0x2, 0x4, 0x8 }, { 0x1, 0x3, 0x6, 0xC },
{ 0x2, 0x4, 0x8, 0x10 }, { 0x3, 0x6, 0xC, 0x18 },
{ 0x4, 0x8, 0x10, 0x20 }, { 0x6, 0xC, 0x18, 0x30 },
{ 0x8, 0x10, 0x20, 0x40 },
{ 0xA, 0x14, 0x28, 0x50 },
{ 0xC, 0x18, 0x30, 0x60 },
{ 0x10, 0x20, 0x40, 0x80 }, { 0x18, 0x30, 0x60, 0xC0 },
{ 0x20, 0x40, 0x80, 0x100 }, { 0x30, 0x60, 0xC0, 0x180 },
{ 0x40, 0x80, 0x100, 0x200 }, { 0x60, 0xC0, 0x180, 0x300 },
{ 0x80, 0x100, 0x200, 0x400 }
};
static const uint8_t hqx_quant_luma[64] = {
16, 16, 16, 19, 19, 19, 42, 44,
16, 16, 19, 19, 19, 38, 43, 45,
16, 19, 19, 19, 40, 41, 45, 48,
19, 19, 19, 40, 41, 42, 46, 49,
19, 19, 40, 41, 42, 43, 48, 101,
19, 38, 41, 42, 43, 44, 98, 104,
42, 43, 45, 46, 48, 98, 109, 116,
44, 45, 48, 49, 101, 104, 116, 123,
};
static const uint8_t hqx_quant_chroma[64] = {
16, 16, 19, 25, 26, 26, 42, 44,
16, 19, 25, 25, 26, 38, 43, 91,
19, 25, 26, 27, 40, 41, 91, 96,
25, 25, 27, 40, 41, 84, 93, 197,
26, 26, 40, 41, 84, 86, 191, 203,
26, 38, 41, 84, 86, 177, 197, 209,
42, 43, 91, 93, 191, 197, 219, 232,
44, 91, 96, 197, 203, 209, 232, 246,
};
static inline void put_blocks(HQXContext *ctx, int plane,
int x, int y, int ilace,
int16_t *block0, int16_t *block1,
const uint8_t *quant)
{
int fields = ilace ? 2 : 1;
int lsize = ctx->pic->linesize[plane];
uint8_t *p = ctx->pic->data[plane] + x * 2;
ctx->hqxdsp.idct_put((uint16_t *)(p + y * lsize),
lsize * fields, block0, quant);
ctx->hqxdsp.idct_put((uint16_t *)(p + (y + (ilace ? 1 : 8)) * lsize),
lsize * fields, block1, quant);
}
static inline void hqx_get_ac(GetBitContext *gb, const HQXAC *ac,
int *run, int *lev)
{
int val;
val = show_bits(gb, ac->lut_bits);
if (ac->lut[val].bits == -1) {
GetBitContext gb2 = *gb;
skip_bits(&gb2, ac->lut_bits);
val = ac->lut[val].lev + show_bits(&gb2, ac->extra_bits);
}
*run = ac->lut[val].run;
*lev = ac->lut[val].lev;
skip_bits(gb, ac->lut[val].bits);
}
static int decode_block(GetBitContext *gb, VLC *vlc,
const int *quants, int dcb,
int16_t block[64], int *last_dc)
{
int q, dc;
int ac_idx;
int run, lev, pos = 1;
memset(block, 0, 64 * sizeof(*block));
dc = get_vlc2(gb, vlc->table, HQX_DC_VLC_BITS, 2);
*last_dc += dc;
block[0] = sign_extend(*last_dc << (12 - dcb), 12);
q = quants[get_bits(gb, 2)];
if (q >= 128)
ac_idx = HQX_AC_Q128;
else if (q >= 64)
ac_idx = HQX_AC_Q64;
else if (q >= 32)
ac_idx = HQX_AC_Q32;
else if (q >= 16)
ac_idx = HQX_AC_Q16;
else if (q >= 8)
ac_idx = HQX_AC_Q8;
else
ac_idx = HQX_AC_Q0;
do {
hqx_get_ac(gb, &ff_hqx_ac[ac_idx], &run, &lev);
pos += run;
if (pos >= 64)
break;
block[ff_zigzag_direct[pos++]] = lev * q;
} while (pos < 64);
return 0;
}
static int hqx_decode_422(HQXContext *ctx, int slice_no, int x, int y)
{
HQXSlice *slice = &ctx->slice[slice_no];
GetBitContext *gb = &slice->gb;
const int *quants;
int flag;
int last_dc;
int i, ret;
if (ctx->interlaced)
flag = get_bits1(gb);
else
flag = 0;
quants = hqx_quants[get_bits(gb, 4)];
for (i = 0; i < 8; i++) {
int vlc_index = ctx->dcb - 9;
if (i == 0 || i == 4 || i == 6)
last_dc = 0;
ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
ctx->dcb, slice->block[i], &last_dc);
if (ret < 0)
return ret;
}
put_blocks(ctx, 0, x, y, flag, slice->block[0], slice->block[2], hqx_quant_luma);
put_blocks(ctx, 0, x + 8, y, flag, slice->block[1], slice->block[3], hqx_quant_luma);
put_blocks(ctx, 2, x >> 1, y, flag, slice->block[4], slice->block[5], hqx_quant_chroma);
put_blocks(ctx, 1, x >> 1, y, flag, slice->block[6], slice->block[7], hqx_quant_chroma);
return 0;
}
static int hqx_decode_422a(HQXContext *ctx, int slice_no, int x, int y)
{
HQXSlice *slice = &ctx->slice[slice_no];
GetBitContext *gb = &slice->gb;
const int *quants;
int flag = 0;
int last_dc;
int i, ret;
int cbp;
cbp = get_vlc2(gb, ctx->cbp_vlc.table, HQX_CBP_VLC_BITS, 1);
for (i = 0; i < 12; i++)
memset(slice->block[i], 0, sizeof(**slice->block) * 64);
for (i = 0; i < 12; i++)
slice->block[i][0] = -0x800;
if (cbp) {
if (ctx->interlaced)
flag = get_bits1(gb);
quants = hqx_quants[get_bits(gb, 4)];
cbp |= cbp << 4; // alpha CBP
if (cbp & 0x3) // chroma CBP - top
cbp |= 0x500;
if (cbp & 0xC) // chroma CBP - bottom
cbp |= 0xA00;
for (i = 0; i < 12; i++) {
if (i == 0 || i == 4 || i == 8 || i == 10)
last_dc = 0;
if (cbp & (1 << i)) {
int vlc_index = ctx->dcb - 9;
ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
ctx->dcb, slice->block[i], &last_dc);
if (ret < 0)
return ret;
}
}
}
put_blocks(ctx, 3, x, y, flag, slice->block[ 0], slice->block[ 2], hqx_quant_luma);
put_blocks(ctx, 3, x + 8, y, flag, slice->block[ 1], slice->block[ 3], hqx_quant_luma);
put_blocks(ctx, 0, x, y, flag, slice->block[ 4], slice->block[ 6], hqx_quant_luma);
put_blocks(ctx, 0, x + 8, y, flag, slice->block[ 5], slice->block[ 7], hqx_quant_luma);
put_blocks(ctx, 2, x >> 1, y, flag, slice->block[ 8], slice->block[ 9], hqx_quant_chroma);
put_blocks(ctx, 1, x >> 1, y, flag, slice->block[10], slice->block[11], hqx_quant_chroma);
return 0;
}
static int hqx_decode_444(HQXContext *ctx, int slice_no, int x, int y)
{
HQXSlice *slice = &ctx->slice[slice_no];
GetBitContext *gb = &slice->gb;
const int *quants;
int flag;
int last_dc;
int i, ret;
if (ctx->interlaced)
flag = get_bits1(gb);
else
flag = 0;
quants = hqx_quants[get_bits(gb, 4)];
for (i = 0; i < 12; i++) {
int vlc_index = ctx->dcb - 9;
if (i == 0 || i == 4 || i == 8)
last_dc = 0;
ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
ctx->dcb, slice->block[i], &last_dc);
if (ret < 0)
return ret;
}
put_blocks(ctx, 0, x, y, flag, slice->block[0], slice->block[ 2], hqx_quant_luma);
put_blocks(ctx, 0, x + 8, y, flag, slice->block[1], slice->block[ 3], hqx_quant_luma);
put_blocks(ctx, 2, x, y, flag, slice->block[4], slice->block[ 6], hqx_quant_chroma);
put_blocks(ctx, 2, x + 8, y, flag, slice->block[5], slice->block[ 7], hqx_quant_chroma);
put_blocks(ctx, 1, x, y, flag, slice->block[8], slice->block[10], hqx_quant_chroma);
put_blocks(ctx, 1, x + 8, y, flag, slice->block[9], slice->block[11], hqx_quant_chroma);
return 0;
}
static int hqx_decode_444a(HQXContext *ctx, int slice_no, int x, int y)
{
HQXSlice *slice = &ctx->slice[slice_no];
GetBitContext *gb = &slice->gb;
const int *quants;
int flag = 0;
int last_dc;
int i, ret;
int cbp;
cbp = get_vlc2(gb, ctx->cbp_vlc.table, HQX_CBP_VLC_BITS, 1);
for (i = 0; i < 16; i++)
memset(slice->block[i], 0, sizeof(**slice->block) * 64);
for (i = 0; i < 16; i++)
slice->block[i][0] = -0x800;
if (cbp) {
if (ctx->interlaced)
flag = get_bits1(gb);
quants = hqx_quants[get_bits(gb, 4)];
cbp |= cbp << 4; // alpha CBP
cbp |= cbp << 8; // chroma CBP
for (i = 0; i < 16; i++) {
if (i == 0 || i == 4 || i == 8 || i == 12)
last_dc = 0;
if (cbp & (1 << i)) {
int vlc_index = ctx->dcb - 9;
ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
ctx->dcb, slice->block[i], &last_dc);
if (ret < 0)
return ret;
}
}
}
put_blocks(ctx, 3, x, y, flag, slice->block[ 0], slice->block[ 2], hqx_quant_luma);
put_blocks(ctx, 3, x + 8, y, flag, slice->block[ 1], slice->block[ 3], hqx_quant_luma);
put_blocks(ctx, 0, x, y, flag, slice->block[ 4], slice->block[ 6], hqx_quant_luma);
put_blocks(ctx, 0, x + 8, y, flag, slice->block[ 5], slice->block[ 7], hqx_quant_luma);
put_blocks(ctx, 2, x, y, flag, slice->block[ 8], slice->block[10], hqx_quant_chroma);
put_blocks(ctx, 2, x + 8, y, flag, slice->block[ 9], slice->block[11], hqx_quant_chroma);
put_blocks(ctx, 1, x, y, flag, slice->block[12], slice->block[14], hqx_quant_chroma);
put_blocks(ctx, 1, x + 8, y, flag, slice->block[13], slice->block[15], hqx_quant_chroma);
return 0;
}
static const int shuffle_16[16] = {
0, 5, 11, 14, 2, 7, 9, 13, 1, 4, 10, 15, 3, 6, 8, 12
};
static int decode_slice(HQXContext *ctx, int slice_no)
{
int mb_w = (ctx->width + 15) >> 4;
int mb_h = (ctx->height + 15) >> 4;
int grp_w = (mb_w + 4) / 5;
int grp_h = (mb_h + 4) / 5;
int grp_h_edge = grp_w * (mb_w / grp_w);
int grp_v_edge = grp_h * (mb_h / grp_h);
int grp_v_rest = mb_w - grp_h_edge;
int grp_h_rest = mb_h - grp_v_edge;
int num_mbs = mb_w * mb_h;
int num_tiles = (num_mbs + 479) / 480;
int std_tile_blocks = num_mbs / (16 * num_tiles);
int g_tile = slice_no * num_tiles;
int blk_addr, loc_addr, mb_x, mb_y, pos, loc_row, i;
int tile_blocks, tile_limit, tile_no;
for (tile_no = 0; tile_no < num_tiles; tile_no++, g_tile++) {
tile_blocks = std_tile_blocks;
tile_limit = -1;
if (g_tile < num_mbs - std_tile_blocks * 16 * num_tiles) {
tile_limit = num_mbs / (16 * num_tiles);
tile_blocks++;
}
for (i = 0; i < tile_blocks; i++) {
if (i == tile_limit)
blk_addr = g_tile + 16 * num_tiles * i;
else
blk_addr = tile_no + 16 * num_tiles * i +
num_tiles * shuffle_16[(i + slice_no) & 0xF];
loc_row = grp_h * (blk_addr / (grp_h * mb_w));
loc_addr = blk_addr % (grp_h * mb_w);
if (loc_row >= grp_v_edge) {
mb_x = grp_w * (loc_addr / (grp_h_rest * grp_w));
pos = loc_addr % (grp_h_rest * grp_w);
} else {
mb_x = grp_w * (loc_addr / (grp_h * grp_w));
pos = loc_addr % (grp_h * grp_w);
}
if (mb_x >= grp_h_edge) {
mb_x += pos % grp_v_rest;
mb_y = loc_row + (pos / grp_v_rest);
} else {
mb_x += pos % grp_w;
mb_y = loc_row + (pos / grp_w);
}
ctx->decode_func(ctx, slice_no, mb_x * 16, mb_y * 16);
}
}
return 0;
}
static int decode_slice_thread(AVCodecContext *avctx, void *arg,
int slice_no, int threadnr)
{
HQXContext *ctx = avctx->priv_data;
uint32_t *slice_off = ctx->slice_off;
int ret;
if (slice_off[slice_no] < HQX_HEADER_SIZE ||
slice_off[slice_no] >= slice_off[slice_no + 1] ||
slice_off[slice_no + 1] > ctx->data_size) {
av_log(avctx, AV_LOG_ERROR, "Invalid slice size %d.\n", ctx->data_size);
return AVERROR_INVALIDDATA;
}
ret = init_get_bits8(&ctx->slice[slice_no].gb,
ctx->src + slice_off[slice_no],
slice_off[slice_no + 1] - slice_off[slice_no]);
if (ret < 0)
return ret;
return decode_slice(ctx, slice_no);
}
static int hqx_decode_frame(AVCodecContext *avctx, void *data,
int *got_picture_ptr, AVPacket *avpkt)
{
HQXContext *ctx = avctx->priv_data;
AVFrame *const frame = data;
uint8_t *src = avpkt->data;
uint32_t info_tag;
int data_start;
int i, ret;
if (avpkt->size < 4 + 4) {
av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
return AVERROR_INVALIDDATA;
}
info_tag = AV_RL32(src);
if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
uint32_t info_offset = AV_RL32(src + 4);
if (info_offset > INT_MAX || info_offset + 8 > avpkt->size) {
av_log(avctx, AV_LOG_ERROR,
"Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",
info_offset);
return AVERROR_INVALIDDATA;
}
ff_canopus_parse_info_tag(avctx, src + 8, info_offset);
info_offset += 8;
src += info_offset;
}
data_start = src - avpkt->data;
ctx->data_size = avpkt->size - data_start;
ctx->src = src;
ctx->pic = data;
if (ctx->data_size < HQX_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "Frame too small.\n");
return AVERROR_INVALIDDATA;
}
if (src[0] != 'H' || src[1] != 'Q') {
av_log(avctx, AV_LOG_ERROR, "Not an HQX frame.\n");
return AVERROR_INVALIDDATA;
}
ctx->interlaced = !(src[2] & 0x80);
ctx->format = src[2] & 7;
ctx->dcb = (src[3] & 3) + 8;
ctx->width = AV_RB16(src + 4);
ctx->height = AV_RB16(src + 6);
for (i = 0; i < 17; i++)
ctx->slice_off[i] = AV_RB24(src + 8 + i * 3);
if (ctx->dcb == 8) {
av_log(avctx, AV_LOG_ERROR, "Invalid DC precision %d.\n", ctx->dcb);
return AVERROR_INVALIDDATA;
}
ret = av_image_check_size(ctx->width, ctx->height, 0, avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid stored dimensions %dx%d.\n",
ctx->width, ctx->height);
return AVERROR_INVALIDDATA;
}
avctx->coded_width = FFALIGN(ctx->width, 16);
avctx->coded_height = FFALIGN(ctx->height, 16);
avctx->width = ctx->width;
avctx->height = ctx->height;
avctx->bits_per_raw_sample = 10;
//The minimum size is 2bit per macroblock
// hqx_decode_422 & hqx_decode_444 have a unconditionally stored 4bits hqx_quants index
// hqx_decode_422a & hqx_decode_444a use cbp_vlc which has a minimum length of 2 bits for its VLCs
// The code rejects slices overlapping in their input data
if (avctx->coded_width / 16 * (avctx->coded_height / 16) *
(100 - avctx->discard_damaged_percentage) / 100 > 4LL * avpkt->size)
return AVERROR_INVALIDDATA;
switch (ctx->format) {
case HQX_422:
avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
ctx->decode_func = hqx_decode_422;
break;
case HQX_444:
avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
ctx->decode_func = hqx_decode_444;
break;
case HQX_422A:
avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;
ctx->decode_func = hqx_decode_422a;
break;
case HQX_444A:
avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;
ctx->decode_func = hqx_decode_444a;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid format: %d.\n", ctx->format);
return AVERROR_INVALIDDATA;
}
ret = ff_thread_get_buffer(avctx, frame, 0);
if (ret < 0)
return ret;
avctx->execute2(avctx, decode_slice_thread, NULL, NULL, 16);
ctx->pic->key_frame = 1;
ctx->pic->pict_type = AV_PICTURE_TYPE_I;
*got_picture_ptr = 1;
return avpkt->size;
}
static av_cold int hqx_decode_close(AVCodecContext *avctx)
{
int i;
HQXContext *ctx = avctx->priv_data;
ff_free_vlc(&ctx->cbp_vlc);
for (i = 0; i < 3; i++) {
ff_free_vlc(&ctx->dc_vlc[i]);
}
return 0;
}
static av_cold int hqx_decode_init(AVCodecContext *avctx)
{
HQXContext *ctx = avctx->priv_data;
ff_hqxdsp_init(&ctx->hqxdsp);
return ff_hqx_init_vlcs(ctx);
}
const FFCodec ff_hqx_decoder = {
.p.name = "hqx",
.p.long_name = NULL_IF_CONFIG_SMALL("Canopus HQX"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_HQX,
.priv_data_size = sizeof(HQXContext),
.init = hqx_decode_init,
.decode = hqx_decode_frame,
.close = hqx_decode_close,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS |
AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};
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