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FFmpeg/libavcodec/fmvc.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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/*
* FM Screen Capture Codec decoder
*
* Copyright (c) 2017 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 <string.h>
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#define BLOCK_HEIGHT 112u
#define BLOCK_WIDTH 84u
typedef struct InterBlock {
int w, h;
int size;
int xor;
} InterBlock;
typedef struct FMVCContext {
GetByteContext gb;
PutByteContext pb;
uint8_t *buffer;
size_t buffer_size;
uint8_t *pbuffer;
size_t pbuffer_size;
ptrdiff_t stride;
int bpp;
int yb, xb;
InterBlock *blocks;
unsigned nb_blocks;
} FMVCContext;
static int decode_type2(GetByteContext *gb, PutByteContext *pb)
{
unsigned repeat = 0, first = 1, opcode = 0;
int i, len, pos;
while (bytestream2_get_bytes_left(gb) > 0) {
GetByteContext gbc;
while (bytestream2_get_bytes_left(gb) > 0) {
if (first) {
first = 0;
if (bytestream2_peek_byte(gb) > 17) {
len = bytestream2_get_byte(gb) - 17;
if (len < 4) {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
continue;
} else {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
if (opcode < 0x10) {
bytestream2_skip(gb, 1);
pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
len = opcode & 3;
if (!len) {
repeat = 1;
} else {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
}
continue;
}
}
repeat = 0;
}
repeat = 1;
}
if (repeat) {
repeat = 0;
opcode = bytestream2_peek_byte(gb);
if (opcode < 0x10) {
bytestream2_skip(gb, 1);
if (!opcode) {
if (!bytestream2_peek_byte(gb)) {
do {
bytestream2_skip(gb, 1);
opcode += 255;
} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
}
opcode += bytestream2_get_byte(gb) + 15;
}
bytestream2_put_le32(pb, bytestream2_get_le32(gb));
for (i = opcode - 1; i > 0; --i)
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
opcode = bytestream2_peek_byte(gb);
if (opcode < 0x10) {
bytestream2_skip(gb, 1);
pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
len = opcode & 3;
if (!len) {
repeat = 1;
} else {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
}
continue;
}
}
}
if (opcode >= 0x40) {
bytestream2_skip(gb, 1);
pos = - ((opcode >> 2) & 7) - 1 - 8 * bytestream2_get_byte(gb);
len = (opcode >> 5) - 1;
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
do {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
--len;
} while (len);
len = opcode & 3;
if (!len) {
repeat = 1;
} else {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
}
continue;
} else if (opcode < 0x20) {
break;
}
len = opcode & 0x1F;
bytestream2_skip(gb, 1);
if (!len) {
if (!bytestream2_peek_byte(gb)) {
do {
bytestream2_skip(gb, 1);
len += 255;
} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
}
len += bytestream2_get_byte(gb) + 31;
}
i = bytestream2_get_le16(gb);
pos = - (i >> 2) - 1;
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
do {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
--len;
} while (len);
} else {
bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
for (len = len - 2; len; --len)
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
}
len = i & 3;
if (!len) {
repeat = 1;
} else {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
}
}
bytestream2_skip(gb, 1);
if (opcode < 0x10) {
pos = -(opcode >> 2) - 1 - 4 * bytestream2_get_byte(gb);
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
len = opcode & 3;
if (!len) {
repeat = 1;
} else {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
}
continue;
}
len = opcode & 7;
if (!len) {
if (!bytestream2_peek_byte(gb)) {
do {
bytestream2_skip(gb, 1);
len += 255;
} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
}
len += bytestream2_get_byte(gb) + 7;
}
i = bytestream2_get_le16(gb);
pos = bytestream2_tell_p(pb) - 2048 * (opcode & 8);
pos = pos - (i >> 2);
if (pos == bytestream2_tell_p(pb))
break;
pos = pos - 0x4000;
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
bytestream2_seek(&gbc, pos, SEEK_SET);
if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
do {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
--len;
} while (len);
} else {
bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
for (len = len - 2; len; --len)
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
}
len = i & 3;
if (!len) {
repeat = 1;
} else {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--len;
} while (len);
opcode = bytestream2_peek_byte(gb);
}
}
return 0;
}
static int decode_type1(GetByteContext *gb, PutByteContext *pb)
{
unsigned opcode = 0, len;
int high = 0;
int i, pos;
while (bytestream2_get_bytes_left(gb) > 0) {
GetByteContext gbc;
while (bytestream2_get_bytes_left(gb) > 0) {
while (bytestream2_get_bytes_left(gb) > 0) {
opcode = bytestream2_get_byte(gb);
high = opcode >= 0x20;
if (high)
break;
if (opcode)
break;
opcode = bytestream2_get_byte(gb);
if (opcode < 0xF8) {
opcode += 32;
break;
}
i = opcode - 0xF8;
if (i) {
len = 256;
do {
len *= 2;
--i;
} while (i);
} else {
len = 280;
}
do {
bytestream2_put_le32(pb, bytestream2_get_le32(gb));
bytestream2_put_le32(pb, bytestream2_get_le32(gb));
len -= 8;
} while (len && bytestream2_get_bytes_left(gb) > 0);
}
if (!high) {
do {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
--opcode;
} while (opcode && bytestream2_get_bytes_left(gb) > 0);
while (bytestream2_get_bytes_left(gb) > 0) {
GetByteContext gbc;
opcode = bytestream2_get_byte(gb);
if (opcode >= 0x20)
break;
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
pos = -(opcode | 32 * bytestream2_get_byte(gb)) - 1;
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
}
}
high = 0;
if (opcode < 0x40)
break;
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
pos = (-((opcode & 0x1F) | 32 * bytestream2_get_byte(gb)) - 1);
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
len = (opcode >> 5) - 1;
do {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
--len;
} while (len && bytestream2_get_bytes_left(&gbc) > 0);
}
len = opcode & 0x1F;
if (!len) {
if (!bytestream2_peek_byte(gb)) {
do {
bytestream2_skip(gb, 1);
len += 255;
} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
}
len += bytestream2_get_byte(gb) + 31;
}
pos = -bytestream2_get_byte(gb);
bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos - (bytestream2_get_byte(gb) << 8), SEEK_SET);
if (bytestream2_tell_p(pb) == bytestream2_tell(&gbc))
break;
if (len < 5 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
} else {
bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
len--;
}
do {
bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
len--;
} while (len && bytestream2_get_bytes_left(&gbc) > 0);
}
return 0;
}
static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
FMVCContext *s = avctx->priv_data;
GetByteContext *gb = &s->gb;
PutByteContext *pb = &s->pb;
int ret, y, x;
int key_frame;
if (avpkt->size < 8)
return AVERROR_INVALIDDATA;
bytestream2_init(gb, avpkt->data, avpkt->size);
bytestream2_skip(gb, 2);
key_frame = !!bytestream2_get_le16(gb);
if (key_frame) {
const uint8_t *src;
unsigned type, size;
uint8_t *dst;
type = bytestream2_get_le16(gb);
size = bytestream2_get_le16(gb);
if (size > bytestream2_get_bytes_left(gb))
return AVERROR_INVALIDDATA;
bytestream2_init_writer(pb, s->buffer, s->buffer_size);
if (type == 1) {
decode_type1(gb, pb);
} else if (type == 2){
decode_type2(gb, pb);
} else {
avpriv_report_missing_feature(avctx, "Compression type %d", type);
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
frame->flags |= AV_FRAME_FLAG_KEY;
frame->pict_type = AV_PICTURE_TYPE_I;
src = s->buffer;
dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
for (y = 0; y < avctx->height; y++) {
memcpy(dst, src, avctx->width * s->bpp);
dst -= frame->linesize[0];
src += s->stride * 4;
if (bytestream2_tell_p(pb) < y*s->stride * 4)
break;
}
} else {
unsigned block, nb_blocks;
int type, k, l;
uint8_t *ssrc, *ddst;
const uint32_t *src;
uint32_t *dst;
for (block = 0; block < s->nb_blocks; block++)
s->blocks[block].xor = 0;
nb_blocks = bytestream2_get_le16(gb);
if (nb_blocks > s->nb_blocks)
return AVERROR_INVALIDDATA;
bytestream2_init_writer(pb, s->pbuffer, s->pbuffer_size);
type = bytestream2_get_le16(gb);
for (block = 0; block < nb_blocks; block++) {
unsigned size, offset;
int start = 0;
offset = bytestream2_get_le16(gb);
if (offset >= s->nb_blocks)
return AVERROR_INVALIDDATA;
size = bytestream2_get_le16(gb);
if (size > bytestream2_get_bytes_left(gb))
return AVERROR_INVALIDDATA;
start = bytestream2_tell_p(pb);
if (type == 1) {
decode_type1(gb, pb);
} else if (type == 2){
decode_type2(gb, pb);
} else {
avpriv_report_missing_feature(avctx, "Compression type %d", type);
return AVERROR_PATCHWELCOME;
}
if (s->blocks[offset].size * 4 != bytestream2_tell_p(pb) - start)
return AVERROR_INVALIDDATA;
s->blocks[offset].xor = 1;
}
src = (const uint32_t *)s->pbuffer;
dst = (uint32_t *)s->buffer;
for (block = 0, y = 0; y < s->yb; y++) {
int block_h = s->blocks[block].h;
uint32_t *rect = dst;
for (x = 0; x < s->xb; x++) {
int block_w = s->blocks[block].w;
uint32_t *row = dst;
block_h = s->blocks[block].h;
if (s->blocks[block].xor) {
for (k = 0; k < block_h; k++) {
uint32_t *column = dst;
for (l = 0; l < block_w; l++)
*dst++ ^= *src++;
dst = &column[s->stride];
}
}
dst = &row[block_w];
++block;
}
dst = &rect[block_h * s->stride];
}
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
frame->flags &= ~AV_FRAME_FLAG_KEY;
frame->pict_type = AV_PICTURE_TYPE_P;
ssrc = s->buffer;
ddst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
for (y = 0; y < avctx->height; y++) {
memcpy(ddst, ssrc, avctx->width * s->bpp);
ddst -= frame->linesize[0];
ssrc += s->stride * 4;
}
}
*got_frame = 1;
return avpkt->size;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
FMVCContext *s = avctx->priv_data;
int i, j, m, block = 0, h = BLOCK_HEIGHT, w = BLOCK_WIDTH;
switch (avctx->bits_per_coded_sample) {
case 16:
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
break;
case 24:
avctx->pix_fmt = AV_PIX_FMT_BGR24;
break;
case 32:
avctx->pix_fmt = AV_PIX_FMT_BGRA;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n",
avctx->bits_per_coded_sample);
return AVERROR_INVALIDDATA;
}
s->stride = (avctx->width * avctx->bits_per_coded_sample + 31) / 32;
s->xb = s->stride / BLOCK_WIDTH;
m = s->stride % BLOCK_WIDTH;
if (m) {
if (m < 37) {
w = m + BLOCK_WIDTH;
} else {
w = m;
s->xb++;
}
}
s->yb = avctx->height / BLOCK_HEIGHT;
m = avctx->height % BLOCK_HEIGHT;
if (m) {
if (m < 49) {
h = m + BLOCK_HEIGHT;
} else {
h = m;
s->yb++;
}
}
s->nb_blocks = s->xb * s->yb;
if (!s->nb_blocks)
return AVERROR_INVALIDDATA;
s->blocks = av_calloc(s->nb_blocks, sizeof(*s->blocks));
if (!s->blocks)
return AVERROR(ENOMEM);
for (i = 0; i < s->yb; i++) {
for (j = 0; j < s->xb; j++) {
if (i != (s->yb - 1) || j != (s->xb - 1)) {
if (i == s->yb - 1) {
s->blocks[block].w = BLOCK_WIDTH;
s->blocks[block].h = h;
s->blocks[block].size = BLOCK_WIDTH * h;
} else if (j == s->xb - 1) {
s->blocks[block].w = w;
s->blocks[block].h = BLOCK_HEIGHT;
s->blocks[block].size = BLOCK_HEIGHT * w;
} else {
s->blocks[block].w = BLOCK_WIDTH;
s->blocks[block].h = BLOCK_HEIGHT;
s->blocks[block].size = BLOCK_WIDTH * BLOCK_HEIGHT;
}
} else {
s->blocks[block].w = w;
s->blocks[block].h = h;
s->blocks[block].size = w * h;
}
block++;
}
}
s->bpp = avctx->bits_per_coded_sample >> 3;
s->buffer_size = avctx->width * avctx->height * 4;
s->pbuffer_size = avctx->width * avctx->height * 4;
s->buffer = av_mallocz(s->buffer_size);
s->pbuffer = av_mallocz(s->pbuffer_size);
if (!s->buffer || !s->pbuffer)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int decode_close(AVCodecContext *avctx)
{
FMVCContext *s = avctx->priv_data;
av_freep(&s->buffer);
av_freep(&s->pbuffer);
av_freep(&s->blocks);
return 0;
}
const FFCodec ff_fmvc_decoder = {
.p.name = "fmvc",
CODEC_LONG_NAME("FM Screen Capture Codec"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_FMVC,
.priv_data_size = sizeof(FMVCContext),
.init = decode_init,
.close = decode_close,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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