forked from KolibriOS/kolibrios
398 lines
12 KiB
C
398 lines
12 KiB
C
/*
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* Packed Animation File video decoder
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* Copyright (c) 2012 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 "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "copy_block.h"
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#include "internal.h"
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static const uint8_t block_sequences[16][8] = {
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{ 0, 0, 0, 0, 0, 0, 0, 0 },
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{ 2, 0, 0, 0, 0, 0, 0, 0 },
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{ 5, 7, 0, 0, 0, 0, 0, 0 },
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{ 5, 0, 0, 0, 0, 0, 0, 0 },
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{ 6, 0, 0, 0, 0, 0, 0, 0 },
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{ 5, 7, 5, 7, 0, 0, 0, 0 },
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{ 5, 7, 5, 0, 0, 0, 0, 0 },
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{ 5, 7, 6, 0, 0, 0, 0, 0 },
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{ 5, 5, 0, 0, 0, 0, 0, 0 },
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{ 3, 0, 0, 0, 0, 0, 0, 0 },
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{ 6, 6, 0, 0, 0, 0, 0, 0 },
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{ 2, 4, 0, 0, 0, 0, 0, 0 },
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{ 2, 4, 5, 7, 0, 0, 0, 0 },
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{ 2, 4, 5, 0, 0, 0, 0, 0 },
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{ 2, 4, 6, 0, 0, 0, 0, 0 },
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{ 2, 4, 5, 7, 5, 7, 0, 0 },
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};
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typedef struct PAFVideoDecContext {
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AVFrame *pic;
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GetByteContext gb;
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int width;
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int height;
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int current_frame;
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uint8_t *frame[4];
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int frame_size;
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int video_size;
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uint8_t *opcodes;
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} PAFVideoDecContext;
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static av_cold int paf_video_close(AVCodecContext *avctx)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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int i;
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av_frame_free(&c->pic);
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for (i = 0; i < 4; i++)
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av_freep(&c->frame[i]);
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return 0;
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}
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static av_cold int paf_video_init(AVCodecContext *avctx)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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int i;
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c->width = avctx->width;
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c->height = avctx->height;
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if (avctx->height & 3 || avctx->width & 3) {
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av_log(avctx, AV_LOG_ERROR,
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"width %d and height %d must be multiplie of 4.\n",
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avctx->width, avctx->height);
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return AVERROR_INVALIDDATA;
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}
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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c->pic = av_frame_alloc();
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if (!c->pic)
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return AVERROR(ENOMEM);
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c->frame_size = avctx->width * FFALIGN(avctx->height, 256);
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c->video_size = avctx->width * avctx->height;
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for (i = 0; i < 4; i++) {
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c->frame[i] = av_mallocz(c->frame_size);
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if (!c->frame[i]) {
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paf_video_close(avctx);
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return AVERROR(ENOMEM);
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}
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}
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return 0;
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}
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static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width)
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{
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int i;
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for (i = 0; i < 4; i++) {
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bytestream2_get_buffer(&c->gb, dst, 4);
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dst += width;
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}
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}
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static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color)
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{
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int i;
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for (i = 0; i < 4; i++) {
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if (mask & (1 << 7 - i))
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dst[i] = color;
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if (mask & (1 << 3 - i))
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dst[width + i] = color;
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}
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}
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static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src)
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{
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int i;
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for (i = 0; i < 4; i++) {
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if (mask & (1 << 7 - i))
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dst[i] = src[i];
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if (mask & (1 << 3 - i))
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dst[width + i] = src[width + i];
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}
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}
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static void set_src_position(PAFVideoDecContext *c,
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const uint8_t **p,
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const uint8_t **pend)
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{
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int val = bytestream2_get_be16(&c->gb);
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int page = val >> 14;
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int x = (val & 0x7F);
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int y = ((val >> 7) & 0x7F);
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*p = c->frame[page] + x * 2 + y * 2 * c->width;
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*pend = c->frame[page] + c->frame_size;
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}
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static int decode_0(PAFVideoDecContext *c, uint8_t *pkt, uint8_t code)
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{
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uint32_t opcode_size, offset;
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uint8_t *dst, *dend, mask = 0, color = 0;
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const uint8_t *src, *send, *opcodes;
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int i, j, op = 0;
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i = bytestream2_get_byte(&c->gb);
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if (i) {
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if (code & 0x10) {
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int align;
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align = bytestream2_tell(&c->gb) & 3;
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if (align)
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bytestream2_skip(&c->gb, 4 - align);
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}
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do {
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int page, val, x, y;
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val = bytestream2_get_be16(&c->gb);
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page = val >> 14;
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x = (val & 0x7F) * 2;
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y = ((val >> 7) & 0x7F) * 2;
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dst = c->frame[page] + x + y * c->width;
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dend = c->frame[page] + c->frame_size;
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offset = (x & 0x7F) * 2;
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j = bytestream2_get_le16(&c->gb) + offset;
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do {
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offset++;
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if (dst + 3 * c->width + 4 > dend)
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return AVERROR_INVALIDDATA;
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read4x4block(c, dst, c->width);
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if ((offset & 0x3F) == 0)
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dst += c->width * 3;
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dst += 4;
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} while (offset < j);
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} while (--i);
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}
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dst = c->frame[c->current_frame];
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dend = c->frame[c->current_frame] + c->frame_size;
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do {
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set_src_position(c, &src, &send);
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if ((src + 3 * c->width + 4 > send) ||
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(dst + 3 * c->width + 4 > dend))
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return AVERROR_INVALIDDATA;
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copy_block4(dst, src, c->width, c->width, 4);
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i++;
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if ((i & 0x3F) == 0)
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dst += c->width * 3;
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dst += 4;
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} while (i < c->video_size / 16);
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opcode_size = bytestream2_get_le16(&c->gb);
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bytestream2_skip(&c->gb, 2);
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if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
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return AVERROR_INVALIDDATA;
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opcodes = pkt + bytestream2_tell(&c->gb);
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bytestream2_skipu(&c->gb, opcode_size);
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dst = c->frame[c->current_frame];
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for (i = 0; i < c->height; i += 4, dst += c->width * 3)
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for (j = 0; j < c->width; j += 4, dst += 4) {
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int opcode, k = 0;
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if (op > opcode_size)
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return AVERROR_INVALIDDATA;
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if (j & 4) {
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opcode = opcodes[op] & 15;
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op++;
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} else {
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opcode = opcodes[op] >> 4;
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}
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while (block_sequences[opcode][k]) {
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offset = c->width * 2;
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code = block_sequences[opcode][k++];
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switch (code) {
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case 2:
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offset = 0;
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case 3:
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color = bytestream2_get_byte(&c->gb);
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case 4:
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mask = bytestream2_get_byte(&c->gb);
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copy_color_mask(dst + offset, c->width, mask, color);
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break;
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case 5:
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offset = 0;
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case 6:
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set_src_position(c, &src, &send);
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case 7:
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if (src + offset + c->width + 4 > send)
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return AVERROR_INVALIDDATA;
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mask = bytestream2_get_byte(&c->gb);
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copy_src_mask(dst + offset, c->width, mask, src + offset);
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break;
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}
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}
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}
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return 0;
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}
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static int paf_video_decode(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *pkt)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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uint8_t code, *dst, *end;
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int i, frame, ret;
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if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
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return ret;
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bytestream2_init(&c->gb, pkt->data, pkt->size);
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code = bytestream2_get_byte(&c->gb);
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if (code & 0x20) { // frame is keyframe
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for (i = 0; i < 4; i++)
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memset(c->frame[i], 0, c->frame_size);
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memset(c->pic->data[1], 0, AVPALETTE_SIZE);
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c->current_frame = 0;
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c->pic->key_frame = 1;
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c->pic->pict_type = AV_PICTURE_TYPE_I;
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} else {
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c->pic->key_frame = 0;
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c->pic->pict_type = AV_PICTURE_TYPE_P;
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}
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if (code & 0x40) { // palette update
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uint32_t *out = (uint32_t *)c->pic->data[1];
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int index, count;
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index = bytestream2_get_byte(&c->gb);
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count = bytestream2_get_byte(&c->gb) + 1;
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if (index + count > 256)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_bytes_left(&c->gb) < 3 * count)
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return AVERROR_INVALIDDATA;
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out += index;
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for (i = 0; i < count; i++) {
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unsigned r, g, b;
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r = bytestream2_get_byteu(&c->gb);
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r = r << 2 | r >> 4;
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g = bytestream2_get_byteu(&c->gb);
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g = g << 2 | g >> 4;
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b = bytestream2_get_byteu(&c->gb);
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b = b << 2 | b >> 4;
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*out++ = (0xFFU << 24) | (r << 16) | (g << 8) | b;
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}
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c->pic->palette_has_changed = 1;
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}
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switch (code & 0x0F) {
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case 0:
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/* Block-based motion compensation using 4x4 blocks with either
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* horizontal or vertical vectors; might incorporate VQ as well. */
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if ((ret = decode_0(c, pkt->data, code)) < 0)
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return ret;
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break;
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case 1:
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/* Uncompressed data. This mode specifies that (width * height) bytes
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* should be copied directly from the encoded buffer into the output. */
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dst = c->frame[c->current_frame];
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// possibly chunk length data
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bytestream2_skip(&c->gb, 2);
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if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
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return AVERROR_INVALIDDATA;
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bytestream2_get_bufferu(&c->gb, dst, c->video_size);
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break;
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case 2:
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/* Copy reference frame: Consume the next byte in the stream as the
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* reference frame (which should be 0, 1, 2, or 3, and should not be
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* the same as the current frame number). */
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frame = bytestream2_get_byte(&c->gb);
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if (frame > 3)
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return AVERROR_INVALIDDATA;
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if (frame != c->current_frame)
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memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
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break;
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case 4:
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/* Run length encoding.*/
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dst = c->frame[c->current_frame];
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end = dst + c->video_size;
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bytestream2_skip(&c->gb, 2);
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while (dst < end) {
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int8_t code;
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int count;
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if (bytestream2_get_bytes_left(&c->gb) < 2)
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return AVERROR_INVALIDDATA;
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code = bytestream2_get_byteu(&c->gb);
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count = FFABS(code) + 1;
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if (dst + count > end)
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return AVERROR_INVALIDDATA;
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if (code < 0)
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memset(dst, bytestream2_get_byteu(&c->gb), count);
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else
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bytestream2_get_buffer(&c->gb, dst, count);
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dst += count;
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}
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break;
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default:
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avpriv_request_sample(avctx, "unknown/invalid code");
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return AVERROR_INVALIDDATA;
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}
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av_image_copy_plane(c->pic->data[0], c->pic->linesize[0],
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c->frame[c->current_frame], c->width,
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c->width, c->height);
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c->current_frame = (c->current_frame + 1) & 3;
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if ((ret = av_frame_ref(data, c->pic)) < 0)
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return ret;
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*got_frame = 1;
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return pkt->size;
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}
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AVCodec ff_paf_video_decoder = {
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.name = "paf_video",
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.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PAF_VIDEO,
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.priv_data_size = sizeof(PAFVideoDecContext),
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.init = paf_video_init,
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.close = paf_video_close,
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.decode = paf_video_decode,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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