mirror of
https://git.ffmpeg.org/ffmpeg.git
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649 lines
22 KiB
C
649 lines
22 KiB
C
/*
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* FM Screen Capture Codec decoder
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*
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* Copyright (c) 2017 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "decode.h"
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#define BLOCK_HEIGHT 112u
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#define BLOCK_WIDTH 84u
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typedef struct InterBlock {
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int w, h;
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int size;
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int xor;
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} InterBlock;
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typedef struct FMVCContext {
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GetByteContext gb;
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PutByteContext pb;
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uint8_t *buffer;
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size_t buffer_size;
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uint8_t *pbuffer;
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size_t pbuffer_size;
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ptrdiff_t stride;
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int bpp;
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int yb, xb;
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InterBlock *blocks;
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unsigned nb_blocks;
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} FMVCContext;
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static int decode_type2(GetByteContext *gb, PutByteContext *pb)
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{
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unsigned repeat = 0, first = 1, opcode = 0;
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int i, len, pos;
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while (bytestream2_get_bytes_left(gb) > 0) {
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GetByteContext gbc;
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while (bytestream2_get_bytes_left(gb) > 0) {
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if (first) {
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first = 0;
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if (bytestream2_peek_byte(gb) > 17) {
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len = bytestream2_get_byte(gb) - 17;
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if (len < 4) {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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continue;
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} else {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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if (opcode < 0x10) {
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bytestream2_skip(gb, 1);
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pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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len = opcode & 3;
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if (!len) {
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repeat = 1;
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} else {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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}
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continue;
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}
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}
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repeat = 0;
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}
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repeat = 1;
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}
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if (repeat) {
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repeat = 0;
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opcode = bytestream2_peek_byte(gb);
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if (opcode < 0x10) {
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bytestream2_skip(gb, 1);
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if (!opcode) {
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if (!bytestream2_peek_byte(gb)) {
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do {
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bytestream2_skip(gb, 1);
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opcode += 255;
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} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
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}
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opcode += bytestream2_get_byte(gb) + 15;
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}
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bytestream2_put_le32(pb, bytestream2_get_le32(gb));
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for (i = opcode - 1; i > 0; --i)
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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opcode = bytestream2_peek_byte(gb);
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if (opcode < 0x10) {
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bytestream2_skip(gb, 1);
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pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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len = opcode & 3;
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if (!len) {
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repeat = 1;
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} else {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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}
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continue;
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}
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}
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}
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if (opcode >= 0x40) {
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bytestream2_skip(gb, 1);
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pos = - ((opcode >> 2) & 7) - 1 - 8 * bytestream2_get_byte(gb);
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len = (opcode >> 5) - 1;
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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--len;
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} while (len);
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len = opcode & 3;
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if (!len) {
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repeat = 1;
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} else {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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}
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continue;
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} else if (opcode < 0x20) {
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break;
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}
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len = opcode & 0x1F;
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bytestream2_skip(gb, 1);
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if (!len) {
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if (!bytestream2_peek_byte(gb)) {
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do {
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bytestream2_skip(gb, 1);
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len += 255;
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} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
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}
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len += bytestream2_get_byte(gb) + 31;
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}
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i = bytestream2_get_le16(gb);
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pos = - (i >> 2) - 1;
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
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if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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--len;
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} while (len);
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} else {
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bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
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for (len = len - 2; len; --len)
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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}
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len = i & 3;
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if (!len) {
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repeat = 1;
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} else {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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}
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}
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bytestream2_skip(gb, 1);
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if (opcode < 0x10) {
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pos = -(opcode >> 2) - 1 - 4 * bytestream2_get_byte(gb);
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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len = opcode & 3;
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if (!len) {
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repeat = 1;
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} else {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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}
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continue;
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}
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len = opcode & 7;
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if (!len) {
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if (!bytestream2_peek_byte(gb)) {
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do {
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bytestream2_skip(gb, 1);
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len += 255;
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} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
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}
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len += bytestream2_get_byte(gb) + 7;
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}
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i = bytestream2_get_le16(gb);
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pos = bytestream2_tell_p(pb) - 2048 * (opcode & 8);
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pos = pos - (i >> 2);
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if (pos == bytestream2_tell_p(pb))
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break;
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pos = pos - 0x4000;
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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bytestream2_seek(&gbc, pos, SEEK_SET);
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if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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--len;
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} while (len);
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} else {
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bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
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for (len = len - 2; len; --len)
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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}
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len = i & 3;
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if (!len) {
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repeat = 1;
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} else {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--len;
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} while (len);
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opcode = bytestream2_peek_byte(gb);
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}
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}
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return 0;
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}
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static int decode_type1(GetByteContext *gb, PutByteContext *pb)
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{
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unsigned opcode = 0, len;
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int high = 0;
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int i, pos;
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while (bytestream2_get_bytes_left(gb) > 0) {
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GetByteContext gbc;
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while (bytestream2_get_bytes_left(gb) > 0) {
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while (bytestream2_get_bytes_left(gb) > 0) {
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opcode = bytestream2_get_byte(gb);
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high = opcode >= 0x20;
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if (high)
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break;
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if (opcode)
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break;
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opcode = bytestream2_get_byte(gb);
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if (opcode < 0xF8) {
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opcode += 32;
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break;
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}
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i = opcode - 0xF8;
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if (i) {
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len = 256;
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do {
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len *= 2;
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--i;
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} while (i);
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} else {
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len = 280;
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}
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do {
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bytestream2_put_le32(pb, bytestream2_get_le32(gb));
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bytestream2_put_le32(pb, bytestream2_get_le32(gb));
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len -= 8;
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} while (len && bytestream2_get_bytes_left(gb) > 0);
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}
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if (!high) {
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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--opcode;
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} while (opcode && bytestream2_get_bytes_left(gb) > 0);
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while (bytestream2_get_bytes_left(gb) > 0) {
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GetByteContext gbc;
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opcode = bytestream2_get_byte(gb);
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if (opcode >= 0x20)
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break;
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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pos = -(opcode | 32 * bytestream2_get_byte(gb)) - 1;
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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}
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}
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high = 0;
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if (opcode < 0x40)
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break;
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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pos = (-((opcode & 0x1F) | 32 * bytestream2_get_byte(gb)) - 1);
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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len = (opcode >> 5) - 1;
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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--len;
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} while (len && bytestream2_get_bytes_left(&gbc) > 0);
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}
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len = opcode & 0x1F;
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if (!len) {
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if (!bytestream2_peek_byte(gb)) {
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do {
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bytestream2_skip(gb, 1);
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len += 255;
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} while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
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}
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len += bytestream2_get_byte(gb) + 31;
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}
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pos = -bytestream2_get_byte(gb);
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bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
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bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos - (bytestream2_get_byte(gb) << 8), SEEK_SET);
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if (bytestream2_tell_p(pb) == bytestream2_tell(&gbc))
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break;
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if (len < 5 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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} else {
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bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
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len--;
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}
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do {
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bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
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len--;
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} while (len && bytestream2_get_bytes_left(&gbc) > 0);
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}
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *avpkt)
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{
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FMVCContext *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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PutByteContext *pb = &s->pb;
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int ret, y, x;
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int key_frame;
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if (avpkt->size < 8)
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return AVERROR_INVALIDDATA;
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bytestream2_init(gb, avpkt->data, avpkt->size);
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bytestream2_skip(gb, 2);
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key_frame = !!bytestream2_get_le16(gb);
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if (key_frame) {
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const uint8_t *src;
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unsigned type, size;
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uint8_t *dst;
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type = bytestream2_get_le16(gb);
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size = bytestream2_get_le16(gb);
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if (size > bytestream2_get_bytes_left(gb))
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return AVERROR_INVALIDDATA;
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bytestream2_init_writer(pb, s->buffer, s->buffer_size);
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if (type == 1) {
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decode_type1(gb, pb);
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} else if (type == 2){
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decode_type2(gb, pb);
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} else {
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avpriv_report_missing_feature(avctx, "Compression type %d", type);
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return AVERROR_PATCHWELCOME;
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}
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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frame->flags |= AV_FRAME_FLAG_KEY;
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frame->pict_type = AV_PICTURE_TYPE_I;
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src = s->buffer;
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dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
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for (y = 0; y < avctx->height; y++) {
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memcpy(dst, src, avctx->width * s->bpp);
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dst -= frame->linesize[0];
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src += s->stride * 4;
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if (bytestream2_tell_p(pb) < y*s->stride * 4)
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break;
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}
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} else {
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unsigned block, nb_blocks;
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int type, k, l;
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uint8_t *ssrc, *ddst;
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const uint32_t *src;
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uint32_t *dst;
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for (block = 0; block < s->nb_blocks; block++)
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s->blocks[block].xor = 0;
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nb_blocks = bytestream2_get_le16(gb);
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if (nb_blocks > s->nb_blocks)
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return AVERROR_INVALIDDATA;
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bytestream2_init_writer(pb, s->pbuffer, s->pbuffer_size);
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type = bytestream2_get_le16(gb);
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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,
|
|
};
|