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FFmpeg/libavcodec/g2meet.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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/*
* Go2Webinar / Go2Meeting decoder
* Copyright (c) 2012 Konstantin Shishkov
* Copyright (c) 2013 Maxim Poliakovski
*
* 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
*/
/**
* @file
* Go2Webinar / Go2Meeting decoder
*/
#include <inttypes.h>
#include <zlib.h>
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "elsdec.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#include "jpegtables.h"
#include "mjpeg.h"
#include "mjpegdec.h"
#define EPIC_PIX_STACK_SIZE 1024
#define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)
enum ChunkType {
DISPLAY_INFO = 0xC8,
TILE_DATA,
CURSOR_POS,
CURSOR_SHAPE,
CHUNK_CC,
CHUNK_CD
};
enum Compression {
COMPR_EPIC_J_B = 2,
COMPR_KEMPF_J_B,
};
static const uint8_t luma_quant[64] = {
8, 6, 5, 8, 12, 20, 26, 31,
6, 6, 7, 10, 13, 29, 30, 28,
7, 7, 8, 12, 20, 29, 35, 28,
7, 9, 11, 15, 26, 44, 40, 31,
9, 11, 19, 28, 34, 55, 52, 39,
12, 18, 28, 32, 41, 52, 57, 46,
25, 32, 39, 44, 52, 61, 60, 51,
36, 46, 48, 49, 56, 50, 52, 50
};
static const uint8_t chroma_quant[64] = {
9, 9, 12, 24, 50, 50, 50, 50,
9, 11, 13, 33, 50, 50, 50, 50,
12, 13, 28, 50, 50, 50, 50, 50,
24, 33, 50, 50, 50, 50, 50, 50,
50, 50, 50, 50, 50, 50, 50, 50,
50, 50, 50, 50, 50, 50, 50, 50,
50, 50, 50, 50, 50, 50, 50, 50,
50, 50, 50, 50, 50, 50, 50, 50,
};
typedef struct ePICPixListElem {
struct ePICPixListElem *next;
uint32_t pixel;
uint8_t rung;
} ePICPixListElem;
typedef struct ePICPixHashElem {
uint32_t pix_id;
struct ePICPixListElem *list;
} ePICPixHashElem;
#define EPIC_HASH_SIZE 256
typedef struct ePICPixHash {
ePICPixHashElem *bucket[EPIC_HASH_SIZE];
int bucket_size[EPIC_HASH_SIZE];
int bucket_fill[EPIC_HASH_SIZE];
} ePICPixHash;
typedef struct ePICContext {
ElsDecCtx els_ctx;
int next_run_pos;
ElsUnsignedRung unsigned_rung;
uint8_t W_flag_rung;
uint8_t N_flag_rung;
uint8_t W_ctx_rung[256];
uint8_t N_ctx_rung[512];
uint8_t nw_pred_rung[256];
uint8_t ne_pred_rung[256];
uint8_t prev_row_rung[14];
uint8_t runlen_zeroes[14];
uint8_t runlen_one;
int stack_pos;
uint32_t stack[EPIC_PIX_STACK_SIZE];
ePICPixHash hash;
} ePICContext;
typedef struct JPGContext {
BlockDSPContext bdsp;
IDCTDSPContext idsp;
ScanTable scantable;
VLC dc_vlc[2], ac_vlc[2];
int prev_dc[3];
DECLARE_ALIGNED(32, int16_t, block)[6][64];
uint8_t *buf;
} JPGContext;
typedef struct G2MContext {
ePICContext ec;
JPGContext jc;
int version;
int compression;
int width, height, bpp;
int orig_width, orig_height;
int tile_width, tile_height;
int tiles_x, tiles_y, tile_x, tile_y;
int got_header;
uint8_t *framebuf;
int framebuf_stride, old_width, old_height;
uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
int tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
int swapuv;
uint8_t *kempf_buf, *kempf_flags;
uint8_t *cursor;
int cursor_stride;
int cursor_fmt;
int cursor_w, cursor_h, cursor_x, cursor_y;
int cursor_hot_x, cursor_hot_y;
} G2MContext;
static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
{
int ret;
ret = ff_mjpeg_build_vlc(&c->dc_vlc[0], ff_mjpeg_bits_dc_luminance,
ff_mjpeg_val_dc, 0, avctx);
if (ret)
return ret;
ret = ff_mjpeg_build_vlc(&c->dc_vlc[1], ff_mjpeg_bits_dc_chrominance,
ff_mjpeg_val_dc, 0, avctx);
if (ret)
return ret;
ret = ff_mjpeg_build_vlc(&c->ac_vlc[0], ff_mjpeg_bits_ac_luminance,
ff_mjpeg_val_ac_luminance, 1, avctx);
if (ret)
return ret;
ret = ff_mjpeg_build_vlc(&c->ac_vlc[1], ff_mjpeg_bits_ac_chrominance,
ff_mjpeg_val_ac_chrominance, 1, avctx);
if (ret)
return ret;
ff_blockdsp_init(&c->bdsp, avctx);
ff_idctdsp_init(&c->idsp, avctx);
ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
ff_zigzag_direct);
return 0;
}
static av_cold void jpg_free_context(JPGContext *ctx)
{
int i;
for (i = 0; i < 2; i++) {
ff_free_vlc(&ctx->dc_vlc[i]);
ff_free_vlc(&ctx->ac_vlc[i]);
}
av_freep(&ctx->buf);
}
static void jpg_unescape(const uint8_t *src, int src_size,
uint8_t *dst, int *dst_size)
{
const uint8_t *src_end = src + src_size;
uint8_t *dst_start = dst;
while (src < src_end) {
uint8_t x = *src++;
*dst++ = x;
if (x == 0xFF && !*src)
src++;
}
*dst_size = dst - dst_start;
}
static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
int plane, int16_t *block)
{
int dc, val, pos;
const int is_chroma = !!plane;
const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
c->bdsp.clear_block(block);
dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 2);
if (dc < 0)
return AVERROR_INVALIDDATA;
if (dc)
dc = get_xbits(gb, dc);
dc = dc * qmat[0] + c->prev_dc[plane];
block[0] = dc;
c->prev_dc[plane] = dc;
pos = 0;
while (pos < 63) {
val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 2);
if (val < 0)
return AVERROR_INVALIDDATA;
pos += val >> 4;
val &= 0xF;
if (pos > 63)
return val ? AVERROR_INVALIDDATA : 0;
if (val) {
int nbits = val;
val = get_xbits(gb, nbits);
val *= qmat[ff_zigzag_direct[pos]];
block[c->scantable.permutated[pos]] = val;
}
}
return 0;
}
static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
{
out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16));
out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
}
static int jpg_decode_data(JPGContext *c, int width, int height,
const uint8_t *src, int src_size,
uint8_t *dst, int dst_stride,
const uint8_t *mask, int mask_stride, int num_mbs,
int swapuv)
{
GetBitContext gb;
int mb_w, mb_h, mb_x, mb_y, i, j;
int bx, by;
int unesc_size;
int ret;
const int ridx = swapuv ? 2 : 0;
if ((ret = av_reallocp(&c->buf,
src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
return ret;
jpg_unescape(src, src_size, c->buf, &unesc_size);
memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
return ret;
width = FFALIGN(width, 16);
mb_w = width >> 4;
mb_h = (height + 15) >> 4;
if (!num_mbs)
num_mbs = mb_w * mb_h * 4;
for (i = 0; i < 3; i++)
c->prev_dc[i] = 1024;
bx =
by = 0;
c->bdsp.clear_blocks(c->block[0]);
for (mb_y = 0; mb_y < mb_h; mb_y++) {
for (mb_x = 0; mb_x < mb_w; mb_x++) {
if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
!mask[mb_x * 2 + mask_stride] &&
!mask[mb_x * 2 + 1 + mask_stride]) {
bx += 16;
continue;
}
for (j = 0; j < 2; j++) {
for (i = 0; i < 2; i++) {
if (mask && !mask[mb_x * 2 + i + j * mask_stride])
continue;
num_mbs--;
if ((ret = jpg_decode_block(c, &gb, 0,
c->block[i + j * 2])) != 0)
return ret;
c->idsp.idct(c->block[i + j * 2]);
}
}
for (i = 1; i < 3; i++) {
if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
return ret;
c->idsp.idct(c->block[i + 3]);
}
for (j = 0; j < 16; j++) {
uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
for (i = 0; i < 16; i++) {
int Y, U, V;
Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
yuv2rgb(out + i * 3, ridx, Y, U, V);
}
}
if (!num_mbs)
return 0;
bx += 16;
}
bx = 0;
by += 16;
if (mask)
mask += mask_stride * 2;
}
return 0;
}
#define LOAD_NEIGHBOURS(x) \
W = curr_row[(x) - 1]; \
N = above_row[(x)]; \
WW = curr_row[(x) - 2]; \
NW = above_row[(x) - 1]; \
NE = above_row[(x) + 1]; \
NN = above2_row[(x)]; \
NNW = above2_row[(x) - 1]; \
NWW = above_row[(x) - 2]; \
NNE = above2_row[(x) + 1]
#define UPDATE_NEIGHBOURS(x) \
NNW = NN; \
NN = NNE; \
NWW = NW; \
NW = N; \
N = NE; \
NE = above_row[(x) + 1]; \
NNE = above2_row[(x) + 1]
#define R_shift 16
#define G_shift 8
#define B_shift 0
/* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
static int djb2_hash(uint32_t key)
{
uint32_t h = 5381;
h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
h = (h * 33) ^ ((key >> 16) & 0xFF);
h = (h * 33) ^ ((key >> 8) & 0xFF);
h = (h * 33) ^ (key & 0xFF);
return h & (EPIC_HASH_SIZE - 1);
}
static void epic_hash_init(ePICPixHash *hash)
{
memset(hash, 0, sizeof(*hash));
}
static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
{
int i, idx = djb2_hash(key);
ePICPixHashElem *bucket = hash->bucket[idx];
for (i = 0; i < hash->bucket_fill[idx]; i++)
if (bucket[i].pix_id == key)
return &bucket[i];
return NULL;
}
static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key)
{
ePICPixHashElem *bucket, *ret;
int idx = djb2_hash(key);
if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
return NULL;
if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
int new_size = hash->bucket_size[idx] + 16;
bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
if (!bucket)
return NULL;
hash->bucket[idx] = bucket;
hash->bucket_size[idx] = new_size;
}
ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
memset(ret, 0, sizeof(*ret));
ret->pix_id = key;
return ret;
}
static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
{
ePICPixListElem *new_elem;
ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
if (!hash_elem) {
if (!(hash_elem = epic_hash_add(hash, key)))
return AVERROR(ENOMEM);
}
new_elem = av_mallocz(sizeof(*new_elem));
if (!new_elem)
return AVERROR(ENOMEM);
new_elem->pixel = pix;
new_elem->next = hash_elem->list;
hash_elem->list = new_elem;
return 0;
}
static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash,
uint32_t pix)
{
ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
if (hash_elem != NULL && hash_elem->list != NULL)
return 1;
return 0;
}
static void epic_free_pixel_cache(ePICPixHash *hash)
{
int i, j;
for (i = 0; i < EPIC_HASH_SIZE; i++) {
for (j = 0; j < hash->bucket_fill[i]; j++) {
ePICPixListElem *list_elem = hash->bucket[i][j].list;
while (list_elem) {
ePICPixListElem *tmp = list_elem->next;
av_free(list_elem);
list_elem = tmp;
}
}
av_freep(&hash->bucket[i]);
hash->bucket_size[i] =
hash->bucket_fill[i] = 0;
}
}
static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
{
int i;
for (i = 0; i < dc->stack_pos; i++)
if (dc->stack[i] == pix)
break;
return i != dc->stack_pos;
}
#define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
static inline int epic_decode_component_pred(ePICContext *dc,
int N, int W, int NW)
{
unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
}
static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
const uint32_t *curr_row,
const uint32_t *above_row)
{
uint32_t N, W, NW, pred;
unsigned delta;
int GN, GW, GNW, R, G, B;
if (x && y) {
W = curr_row[x - 1];
N = above_row[x];
NW = above_row[x - 1];
GN = (N >> G_shift) & 0xFF;
GW = (W >> G_shift) & 0xFF;
GNW = (NW >> G_shift) & 0xFF;
G = epic_decode_component_pred(dc, GN, GW, GNW);
R = G + epic_decode_component_pred(dc,
((N >> R_shift) & 0xFF) - GN,
((W >> R_shift) & 0xFF) - GW,
((NW >> R_shift) & 0xFF) - GNW);
B = G + epic_decode_component_pred(dc,
((N >> B_shift) & 0xFF) - GN,
((W >> B_shift) & 0xFF) - GW,
((NW >> B_shift) & 0xFF) - GNW);
} else {
if (x)
pred = curr_row[x - 1];
else
pred = above_row[x];
delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
}
if (R<0 || G<0 || B<0 || R > 255 || G > 255 || B > 255) {
avpriv_request_sample(NULL, "RGB %d %d %d (out of range)", R, G, B);
return 0;
}
return (R << R_shift) | (G << G_shift) | (B << B_shift);
}
static int epic_predict_pixel(ePICContext *dc, uint8_t *rung,
uint32_t *pPix, uint32_t pix)
{
if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
*pPix = pix;
return 1;
}
dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
return 0;
}
static int epic_handle_edges(ePICContext *dc, int x, int y,
const uint32_t *curr_row,
const uint32_t *above_row, uint32_t *pPix)
{
uint32_t pix;
if (!x && !y) { /* special case: top-left pixel */
/* the top-left pixel is coded independently with 3 unsigned numbers */
*pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
(ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) |
(ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift);
return 1;
}
if (x) { /* predict from W first */
pix = curr_row[x - 1];
if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
return 1;
}
if (y) { /* then try to predict from N */
pix = above_row[x];
if (!dc->stack_pos || dc->stack[0] != pix) {
if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
return 1;
}
}
return 0;
}
static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
const uint32_t *curr_row,
const uint32_t *above_row,
const uint32_t *above2_row,
uint32_t *pPix, int *pRun)
{
int idx, got_pixel = 0, WWneW, old_WWneW = 0;
uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
*pRun = 0;
LOAD_NEIGHBOURS(x);
if (dc->next_run_pos == x) {
/* can't reuse W for the new pixel in this case */
WWneW = 1;
} else {
idx = (WW != W) << 7 |
(NW != W) << 6 |
(N != NE) << 5 |
(NW != N) << 4 |
(NWW != NW) << 3 |
(NNE != NE) << 2 |
(NN != N) << 1 |
(NNW != NW);
WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
if (WWneW < 0)
return WWneW;
}
if (WWneW)
dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
else {
*pPix = W;
got_pixel = 1;
}
do {
int NWneW = 1;
if (got_pixel) // pixel value already known (derived from either W or N)
NWneW = *pPix != N;
else { // pixel value is unknown and will be decoded later
NWneW = *pRun ? NWneW : NW != W;
/* TODO: RFC this mess! */
switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
case 0:
break; // do nothing here
case 3:
case 5:
case 6:
case 7:
if (!is_pixel_on_stack(dc, N)) {
idx = WWneW << 8 |
(*pRun ? old_WWneW : WW != W) << 7 |
NWneW << 6 |
(N != NE) << 5 |
(NW != N) << 4 |
(NWW != NW) << 3 |
(NNE != NE) << 2 |
(NN != N) << 1 |
(NNW != NW);
if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
NWneW = 0;
*pPix = N;
got_pixel = 1;
break;
}
}
/* fall through */
default:
NWneW = 1;
old_WWneW = WWneW;
if (!is_pixel_on_stack(dc, N))
dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
}
}
(*pRun)++;
if (x + *pRun >= tile_width - 1)
break;
UPDATE_NEIGHBOURS(x + *pRun);
if (!NWneW && NW == N && N == NE) {
int pos, run, rle;
int start_pos = x + *pRun;
/* scan for a run of pix in the line above */
uint32_t pix = above_row[start_pos + 1];
for (pos = start_pos + 2; pos < tile_width; pos++)
if (!(above_row[pos] == pix))
break;
run = pos - start_pos - 1;
idx = av_ceil_log2(run);
if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
*pRun += run;
else {
int flag;
/* run-length is coded as plain binary number of idx - 1 bits */
for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
if ((1 << pos) + rle < run &&
ff_els_decode_bit(&dc->els_ctx,
flag ? &dc->runlen_one
: &dc->runlen_zeroes[pos])) {
flag = 1;
rle |= 1 << pos;
}
}
*pRun += rle;
break; // return immediately
}
if (x + *pRun >= tile_width - 1)
break;
LOAD_NEIGHBOURS(x + *pRun);
WWneW = 0;
NWneW = 0;
}
idx = WWneW << 7 |
NWneW << 6 |
(N != NE) << 5 |
(NW != N) << 4 |
(NWW != NW) << 3 |
(NNE != NE) << 2 |
(NN != N) << 1 |
(NNW != NW);
WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
} while (!WWneW);
dc->next_run_pos = x + *pRun;
return got_pixel;
}
static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung,
uint32_t *pPix, uint32_t pix)
{
if (ff_els_decode_bit(&dc->els_ctx, rung)) {
*pPix = pix;
return 1;
}
dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
return 0;
}
static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
int tile_width, const uint32_t *curr_row,
const uint32_t *above_row, uint32_t *pPix)
{
int pos;
/* try to reuse the NW pixel first */
if (x && y) {
uint32_t NW = above_row[x - 1];
if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
return 1;
}
}
/* try to reuse the NE[x + run, y] pixel */
pos = x + run - 1;
if (pos < tile_width - 1 && y) {
uint32_t NE = above_row[pos + 1];
if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
return 1;
}
}
return 0;
}
static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
{
ePICPixListElem *list, *prev = NULL;
ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
if (!hash_elem || !hash_elem->list)
return 0;
list = hash_elem->list;
while (list) {
if (!is_pixel_on_stack(dc, list->pixel)) {
if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
*pPix = list->pixel;
if (list != hash_elem->list) {
prev->next = list->next;
list->next = hash_elem->list;
hash_elem->list = list;
}
return 1;
}
dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
}
prev = list;
list = list->next;
}
return 0;
}
static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
int tile_width, int stride)
{
int x, y;
uint32_t pix;
uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
for (y = 0; y < tile_height; y++, out += stride) {
above2_row = above_row;
above_row = curr_row;
curr_row = (uint32_t *) out;
for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
if (dc->els_ctx.err)
return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
pix = curr_row[x - 1]; // get W pixel
if (y >= 1 && x >= 2 &&
pix != curr_row[x - 2] && pix != above_row[x - 1] &&
pix != above_row[x - 2] && pix != above_row[x] &&
!epic_cache_entries_for_pixel(&dc->hash, pix)) {
curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
x++;
} else {
int got_pixel, run;
dc->stack_pos = 0; // empty stack
if (y < 2 || x < 2 || x == tile_width - 1) {
run = 1;
got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
} else {
got_pixel = epic_decode_run_length(dc, x, y, tile_width,
curr_row, above_row,
above2_row, &pix, &run);
if (got_pixel < 0)
return got_pixel;
}
if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
tile_width, curr_row,
above_row, &pix)) {
uint32_t ref_pix = curr_row[x - 1];
if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
if (is_pixel_on_stack(dc, pix))
return AVERROR_INVALIDDATA;
if (x) {
int ret = epic_add_pixel_to_cache(&dc->hash,
ref_pix,
pix);
if (ret)
return ret;
}
}
}
for (; run > 0; x++, run--)
curr_row[x] = pix;
}
}
}
return 0;
}
static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
const uint8_t *src, size_t src_size,
AVCodecContext *avctx)
{
uint8_t prefix, mask = 0x80;
int extrabytes, tile_width, tile_height, awidth, aheight;
size_t els_dsize;
uint8_t *dst;
if (!src_size)
return 0;
/* get data size of the ELS partition as unsigned variable-length integer */
prefix = *src++;
src_size--;
for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
mask >>= 1;
if (extrabytes > 3 || src_size < extrabytes) {
av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
return AVERROR_INVALIDDATA;
}
els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
while (extrabytes-- > 0) {
els_dsize = (els_dsize << 8) | *src++;
src_size--;
}
if (src_size < els_dsize) {
av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
els_dsize, src_size);
return AVERROR_INVALIDDATA;
}
tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
awidth = FFALIGN(tile_width, 16);
aheight = FFALIGN(tile_height, 16);
if (tile_width > (1 << FF_ARRAY_ELEMS(c->ec.prev_row_rung))) {
avpriv_request_sample(avctx, "large tile width");
return AVERROR_INVALIDDATA;
}
if (els_dsize) {
int ret, i, j, k;
uint8_t tr_r, tr_g, tr_b, *buf;
uint32_t *in;
/* ELS decoder initializations */
memset(&c->ec, 0, sizeof(c->ec));
ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
epic_hash_init(&c->ec.hash);
/* decode transparent pixel value */
tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
if (c->ec.els_ctx.err != 0) {
av_log(avctx, AV_LOG_ERROR,
"ePIC: couldn't decode transparency pixel!\n");
ff_els_decoder_uninit(&c->ec.unsigned_rung);
return AVERROR_INVALIDDATA;
}
ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
c->epic_buf_stride);
epic_free_pixel_cache(&c->ec.hash);
ff_els_decoder_uninit(&c->ec.unsigned_rung);
if (ret) {
av_log(avctx, AV_LOG_ERROR,
"ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
avctx->frame_number, tile_x, tile_y);
return AVERROR_INVALIDDATA;
}
buf = c->epic_buf;
dst = c->framebuf + tile_x * c->tile_width * 3 +
tile_y * c->tile_height * c->framebuf_stride;
for (j = 0; j < tile_height; j++) {
uint8_t *out = dst;
in = (uint32_t *) buf;
for (i = 0; i < tile_width; i++) {
out[0] = (in[i] >> R_shift) & 0xFF;
out[1] = (in[i] >> G_shift) & 0xFF;
out[2] = (in[i] >> B_shift) & 0xFF;
out += 3;
}
buf += c->epic_buf_stride;
dst += c->framebuf_stride;
}
if (src_size > els_dsize) {
uint8_t *jpg;
uint32_t tr;
int bstride = FFALIGN(tile_width, 16) >> 3;
int nblocks = 0;
int estride = c->epic_buf_stride >> 2;
src += els_dsize;
src_size -= els_dsize;
in = (uint32_t *) c->epic_buf;
tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
memset(c->kempf_flags, 0,
(aheight >> 3) * bstride * sizeof(*c->kempf_flags));
for (j = 0; j < tile_height; j += 8) {
for (i = 0; i < tile_width; i += 8) {
c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
for (k = 0; k < 8 * 8; k++) {
if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
nblocks++;
break;
}
}
}
in += 8 * estride;
}
memset(c->jpeg_tile, 0, c->tile_stride * aheight);
jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
c->jpeg_tile, c->tile_stride,
c->kempf_flags, bstride, nblocks, c->swapuv);
in = (uint32_t *) c->epic_buf;
dst = c->framebuf + tile_x * c->tile_width * 3 +
tile_y * c->tile_height * c->framebuf_stride;
jpg = c->jpeg_tile;
for (j = 0; j < tile_height; j++) {
for (i = 0; i < tile_width; i++)
if (in[i] == tr)
memcpy(dst + i * 3, jpg + i * 3, 3);
in += c->epic_buf_stride >> 2;
dst += c->framebuf_stride;
jpg += c->tile_stride;
}
}
} else {
dst = c->framebuf + tile_x * c->tile_width * 3 +
tile_y * c->tile_height * c->framebuf_stride;
return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
}
return 0;
}
static int kempf_restore_buf(const uint8_t *src, int len,
uint8_t *dst, int stride,
const uint8_t *jpeg_tile, int tile_stride,
int width, int height,
const uint8_t *pal, int npal, int tidx)
{
GetBitContext gb;
int i, j, nb, col;
int ret;
int align_width = FFALIGN(width, 16);
if ((ret = init_get_bits8(&gb, src, len)) < 0)
return ret;
if (npal <= 2) nb = 1;
else if (npal <= 4) nb = 2;
else if (npal <= 16) nb = 4;
else nb = 8;
for (j = 0; j < height; j++, dst += stride, jpeg_tile = FF_PTR_ADD(jpeg_tile, tile_stride)) {
if (get_bits(&gb, 8))
continue;
for (i = 0; i < width; i++) {
col = get_bits(&gb, nb);
if (col != tidx)
memcpy(dst + i * 3, pal + col * 3, 3);
else
memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
}
skip_bits_long(&gb, nb * (align_width - width));
}
return 0;
}
static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
const uint8_t *src, int src_size)
{
int width, height;
int hdr, zsize, npal, tidx = -1, ret;
int i, j;
const uint8_t *src_end = src + src_size;
uint8_t pal[768], transp[3];
uLongf dlen = (c->tile_width + 1) * c->tile_height;
int sub_type;
int nblocks, cblocks, bstride;
int bits, bitbuf, coded;
uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
tile_y * c->tile_height * c->framebuf_stride;
if (src_size < 2)
return AVERROR_INVALIDDATA;
width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
hdr = *src++;
sub_type = hdr >> 5;
if (sub_type == 0) {
int j;
memcpy(transp, src, 3);
src += 3;
for (j = 0; j < height; j++, dst += c->framebuf_stride)
for (i = 0; i < width; i++)
memcpy(dst + i * 3, transp, 3);
return 0;
} else if (sub_type == 1) {
return jpg_decode_data(&c->jc, width, height, src, src_end - src,
dst, c->framebuf_stride, NULL, 0, 0, 0);
}
if (sub_type != 2) {
memcpy(transp, src, 3);
src += 3;
}
npal = *src++ + 1;
if (src_end - src < npal * 3)
return AVERROR_INVALIDDATA;
memcpy(pal, src, npal * 3);
src += npal * 3;
if (sub_type != 2) {
for (i = 0; i < npal; i++) {
if (!memcmp(pal + i * 3, transp, 3)) {
tidx = i;
break;
}
}
}
if (src_end - src < 2)
return 0;
zsize = (src[0] << 8) | src[1];
src += 2;
if (src_end - src < zsize + (sub_type != 2))
return AVERROR_INVALIDDATA;
ret = uncompress(c->kempf_buf, &dlen, src, zsize);
if (ret)
return AVERROR_INVALIDDATA;
src += zsize;
if (sub_type == 2) {
kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
NULL, 0, width, height, pal, npal, tidx);
return 0;
}
nblocks = *src++ + 1;
cblocks = 0;
bstride = FFALIGN(width, 16) >> 3;
// blocks are coded LSB and we need normal bitreader for JPEG data
bits = 0;
for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
if (!bits) {
if (src >= src_end)
return AVERROR_INVALIDDATA;
bitbuf = *src++;
bits = 8;
}
coded = bitbuf & 1;
bits--;
bitbuf >>= 1;
cblocks += coded;
if (cblocks > nblocks)
return AVERROR_INVALIDDATA;
c->kempf_flags[j * 2 + i * 2 * bstride] =
c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
}
}
memset(c->jpeg_tile, 0, c->tile_stride * height);
jpg_decode_data(&c->jc, width, height, src, src_end - src,
c->jpeg_tile, c->tile_stride,
c->kempf_flags, bstride, nblocks * 4, 0);
kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
c->jpeg_tile, c->tile_stride,
width, height, pal, npal, tidx);
return 0;
}
static int g2m_init_buffers(G2MContext *c)
{
int aligned_height;
if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
aligned_height = c->height + 15;
av_free(c->framebuf);
c->framebuf = av_calloc(c->framebuf_stride, aligned_height);
if (!c->framebuf)
return AVERROR(ENOMEM);
}
if (!c->synth_tile || !c->jpeg_tile ||
(c->compression == 2 && !c->epic_buf_base) ||
c->old_tile_w < c->tile_width ||
c->old_tile_h < c->tile_height) {
c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
aligned_height = FFALIGN(c->tile_height, 16);
av_freep(&c->synth_tile);
av_freep(&c->jpeg_tile);
av_freep(&c->kempf_buf);
av_freep(&c->kempf_flags);
av_freep(&c->epic_buf_base);
c->epic_buf = NULL;
c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height +
AV_INPUT_BUFFER_PADDING_SIZE);
c->kempf_flags = av_mallocz(c->tile_width * aligned_height);
if (!c->synth_tile || !c->jpeg_tile ||
!c->kempf_buf || !c->kempf_flags)
return AVERROR(ENOMEM);
if (c->compression == 2) {
c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
if (!c->epic_buf_base)
return AVERROR(ENOMEM);
c->epic_buf = c->epic_buf_base + 4;
}
}
return 0;
}
static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
GetByteContext *gb)
{
int i, j, k;
uint8_t *dst;
uint32_t bits;
uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
uint32_t cursor_hot_x, cursor_hot_y;
int cursor_fmt, err;
cur_size = bytestream2_get_be32(gb);
cursor_w = bytestream2_get_byte(gb);
cursor_h = bytestream2_get_byte(gb);
cursor_hot_x = bytestream2_get_byte(gb);
cursor_hot_y = bytestream2_get_byte(gb);
cursor_fmt = bytestream2_get_byte(gb);
cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
if (cursor_w < 1 || cursor_w > 256 ||
cursor_h < 1 || cursor_h > 256) {
av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
cursor_w, cursor_h);
return AVERROR_INVALIDDATA;
}
if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
cursor_hot_x, cursor_hot_y);
cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
}
if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
c->cursor_w * c->cursor_h / 4 > cur_size) {
av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
cur_size, bytestream2_get_bytes_left(gb));
return AVERROR_INVALIDDATA;
}
if (cursor_fmt != 1 && cursor_fmt != 32) {
avpriv_report_missing_feature(avctx, "Cursor format %d",
cursor_fmt);
return AVERROR_PATCHWELCOME;
}
if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
return err;
}
c->cursor_w = cursor_w;
c->cursor_h = cursor_h;
c->cursor_hot_x = cursor_hot_x;
c->cursor_hot_y = cursor_hot_y;
c->cursor_fmt = cursor_fmt;
c->cursor_stride = cursor_stride;
dst = c->cursor;
switch (c->cursor_fmt) {
case 1: // old monochrome
for (j = 0; j < c->cursor_h; j++) {
for (i = 0; i < c->cursor_w; i += 32) {
bits = bytestream2_get_be32(gb);
for (k = 0; k < 32; k++) {
dst[0] = !!(bits & 0x80000000);
dst += 4;
bits <<= 1;
}
}
}
dst = c->cursor;
for (j = 0; j < c->cursor_h; j++) {
for (i = 0; i < c->cursor_w; i += 32) {
bits = bytestream2_get_be32(gb);
for (k = 0; k < 32; k++) {
int mask_bit = !!(bits & 0x80000000);
switch (dst[0] * 2 + mask_bit) {
case 0:
dst[0] = 0xFF;
dst[1] = 0x00;
dst[2] = 0x00;
dst[3] = 0x00;
break;
case 1:
dst[0] = 0xFF;
dst[1] = 0xFF;
dst[2] = 0xFF;
dst[3] = 0xFF;
break;
default:
dst[0] = 0x00;
dst[1] = 0x00;
dst[2] = 0x00;
dst[3] = 0x00;
}
dst += 4;
bits <<= 1;
}
}
}
break;
case 32: // full colour
/* skip monochrome version of the cursor and decode RGBA instead */
bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
for (j = 0; j < c->cursor_h; j++) {
for (i = 0; i < c->cursor_w; i++) {
int val = bytestream2_get_be32(gb);
*dst++ = val >> 0;
*dst++ = val >> 8;
*dst++ = val >> 16;
*dst++ = val >> 24;
}
}
break;
default:
return AVERROR_PATCHWELCOME;
}
return 0;
}
#define APPLY_ALPHA(src, new, alpha) \
src = (src * (256 - alpha) + new * alpha) >> 8
static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
{
int i, j;
int x, y, w, h;
const uint8_t *cursor;
if (!c->cursor)
return;
x = c->cursor_x - c->cursor_hot_x;
y = c->cursor_y - c->cursor_hot_y;
cursor = c->cursor;
w = c->cursor_w;
h = c->cursor_h;
if (x + w > c->width)
w = c->width - x;
if (y + h > c->height)
h = c->height - y;
if (x < 0) {
w += x;
cursor += -x * 4;
} else {
dst += x * 3;
}
if (y < 0)
h += y;
if (w < 0 || h < 0)
return;
if (y < 0) {
cursor += -y * c->cursor_stride;
} else {
dst += y * stride;
}
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
uint8_t alpha = cursor[i * 4];
APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
}
dst += stride;
cursor += c->cursor_stride;
}
}
static int g2m_decode_frame(AVCodecContext *avctx, void *data,
int *got_picture_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
G2MContext *c = avctx->priv_data;
AVFrame *pic = data;
GetByteContext bc, tbc;
int magic;
int got_header = 0;
uint32_t chunk_size, r_mask, g_mask, b_mask;
int chunk_type, chunk_start;
int i;
int ret;
if (buf_size < 12) {
av_log(avctx, AV_LOG_ERROR,
"Frame should have at least 12 bytes, got %d instead\n",
buf_size);
return AVERROR_INVALIDDATA;
}
bytestream2_init(&bc, buf, buf_size);
magic = bytestream2_get_be32(&bc);
if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
(magic & 0xF) < 2 || (magic & 0xF) > 5) {
av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
return AVERROR_INVALIDDATA;
}
c->swapuv = magic == MKBETAG('G', '2', 'M', '2');
while (bytestream2_get_bytes_left(&bc) > 5) {
chunk_size = bytestream2_get_le32(&bc) - 1;
chunk_type = bytestream2_get_byte(&bc);
chunk_start = bytestream2_tell(&bc);
if (chunk_size > bytestream2_get_bytes_left(&bc)) {
av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
chunk_size, chunk_type);
break;
}
switch (chunk_type) {
case DISPLAY_INFO:
got_header =
c->got_header = 0;
if (chunk_size < 21) {
av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
chunk_size);
break;
}
c->width = bytestream2_get_be32(&bc);
c->height = bytestream2_get_be32(&bc);
if (c->width < 16 || c->height < 16) {
av_log(avctx, AV_LOG_ERROR,
"Invalid frame dimensions %dx%d\n",
c->width, c->height);
ret = AVERROR_INVALIDDATA;
goto header_fail;
}
if (c->width != avctx->width || c->height != avctx->height) {
ret = ff_set_dimensions(avctx, c->width, c->height);
if (ret < 0)
goto header_fail;
}
c->compression = bytestream2_get_be32(&bc);
if (c->compression != 2 && c->compression != 3) {
avpriv_report_missing_feature(avctx, "Compression method %d",
c->compression);
ret = AVERROR_PATCHWELCOME;
goto header_fail;
}
c->tile_width = bytestream2_get_be32(&bc);
c->tile_height = bytestream2_get_be32(&bc);
if (c->tile_width <= 0 || c->tile_height <= 0 ||
((c->tile_width | c->tile_height) & 0xF) ||
c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4 ||
av_image_check_size2(c->tile_width, c->tile_height, avctx->max_pixels, avctx->pix_fmt, 0, avctx) < 0
) {
av_log(avctx, AV_LOG_ERROR,
"Invalid tile dimensions %dx%d\n",
c->tile_width, c->tile_height);
ret = AVERROR_INVALIDDATA;
goto header_fail;
}
c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
c->bpp = bytestream2_get_byte(&bc);
if (c->bpp == 32) {
if (bytestream2_get_bytes_left(&bc) < 16 ||
(chunk_size - 21) < 16) {
av_log(avctx, AV_LOG_ERROR,
"Display info: missing bitmasks!\n");
ret = AVERROR_INVALIDDATA;
goto header_fail;
}
r_mask = bytestream2_get_be32(&bc);
g_mask = bytestream2_get_be32(&bc);
b_mask = bytestream2_get_be32(&bc);
if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
avpriv_report_missing_feature(avctx,
"Bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32,
r_mask, g_mask, b_mask);
ret = AVERROR_PATCHWELCOME;
goto header_fail;
}
} else {
avpriv_request_sample(avctx, "bpp=%d", c->bpp);
ret = AVERROR_PATCHWELCOME;
goto header_fail;
}
if (g2m_init_buffers(c)) {
ret = AVERROR(ENOMEM);
goto header_fail;
}
got_header = 1;
break;
case TILE_DATA:
if (!c->tiles_x || !c->tiles_y) {
av_log(avctx, AV_LOG_WARNING,
"No display info - skipping tile\n");
break;
}
if (chunk_size < 2) {
av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
chunk_size);
break;
}
c->tile_x = bytestream2_get_byte(&bc);
c->tile_y = bytestream2_get_byte(&bc);
if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
av_log(avctx, AV_LOG_ERROR,
"Invalid tile pos %d,%d (in %dx%d grid)\n",
c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
break;
}
ret = 0;
switch (c->compression) {
case COMPR_EPIC_J_B:
ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
buf + bytestream2_tell(&bc),
chunk_size - 2, avctx);
break;
case COMPR_KEMPF_J_B:
ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
buf + bytestream2_tell(&bc),
chunk_size - 2);
break;
}
if (ret && c->framebuf)
av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
c->tile_x, c->tile_y);
break;
case CURSOR_POS:
if (chunk_size < 5) {
av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
chunk_size);
break;
}
c->cursor_x = bytestream2_get_be16(&bc);
c->cursor_y = bytestream2_get_be16(&bc);
break;
case CURSOR_SHAPE:
if (chunk_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
chunk_size);
break;
}
bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
chunk_size - 4);
g2m_load_cursor(avctx, c, &tbc);
break;
case CHUNK_CC:
case CHUNK_CD:
break;
default:
av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
chunk_type);
}
/* navigate to next chunk */
bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
}
if (got_header)
c->got_header = 1;
if (c->width && c->height && c->framebuf) {
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
pic->key_frame = got_header;
pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
for (i = 0; i < avctx->height; i++)
memcpy(pic->data[0] + i * pic->linesize[0],
c->framebuf + i * c->framebuf_stride,
c->width * 3);
g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
*got_picture_ptr = 1;
}
return buf_size;
header_fail:
c->width =
c->height = 0;
c->tiles_x =
c->tiles_y = 0;
c->tile_width =
c->tile_height = 0;
return ret;
}
static av_cold int g2m_decode_init(AVCodecContext *avctx)
{
G2MContext *const c = avctx->priv_data;
int ret;
if ((ret = jpg_init(avctx, &c->jc)) != 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
return AVERROR(ENOMEM);
}
avctx->pix_fmt = AV_PIX_FMT_RGB24;
// store original sizes and check against those if resize happens
c->orig_width = avctx->width;
c->orig_height = avctx->height;
return 0;
}
static av_cold int g2m_decode_end(AVCodecContext *avctx)
{
G2MContext *const c = avctx->priv_data;
jpg_free_context(&c->jc);
av_freep(&c->epic_buf_base);
c->epic_buf = NULL;
av_freep(&c->kempf_buf);
av_freep(&c->kempf_flags);
av_freep(&c->synth_tile);
av_freep(&c->jpeg_tile);
av_freep(&c->cursor);
av_freep(&c->framebuf);
return 0;
}
const FFCodec ff_g2m_decoder = {
.p.name = "g2m",
.p.long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_G2M,
.priv_data_size = sizeof(G2MContext),
.init = g2m_decode_init,
.close = g2m_decode_end,
.decode = g2m_decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
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