mirror of
https://git.ffmpeg.org/ffmpeg.git
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284 lines
8.5 KiB
C
284 lines
8.5 KiB
C
/*
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* Beam Software VB decoder
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* Copyright (c) 2007 Konstantin Shishkov
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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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/**
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* @file
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* VB Video decoder
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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enum VBFlags {
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VB_HAS_GMC = 0x01,
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VB_HAS_AUDIO = 0x04,
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VB_HAS_VIDEO = 0x08,
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VB_HAS_PALETTE = 0x10,
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VB_HAS_LENGTH = 0x20
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};
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typedef struct VBDecContext {
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AVCodecContext *avctx;
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uint8_t *frame, *prev_frame;
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uint32_t pal[AVPALETTE_COUNT];
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GetByteContext stream;
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} VBDecContext;
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static const uint16_t vb_patterns[64] = {
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0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8,
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0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00,
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0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222,
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0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC,
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0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113,
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0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC,
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0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63,
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0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C
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};
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static void vb_decode_palette(VBDecContext *c, int data_size)
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{
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int start, size, i;
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start = bytestream2_get_byte(&c->stream);
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size = (bytestream2_get_byte(&c->stream) - 1) & 0xFF;
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if (start + size > 255) {
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av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
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return;
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}
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if (size*3+2 > data_size) {
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av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n");
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return;
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}
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for (i = start; i <= start + size; i++)
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c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->stream);
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}
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static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
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{
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return buf >= start && buf < end;
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}
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static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end)
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{
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return buf >= start && (buf + 4) <= end;
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}
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static int vb_decode_framedata(VBDecContext *c, int offset)
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{
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GetByteContext g;
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uint8_t *prev, *cur;
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int blk, blocks, t, blk2;
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int blocktypes = 0;
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int x, y, a, b;
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int pattype, pattern;
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const int width = c->avctx->width;
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uint8_t *pstart = c->prev_frame;
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uint8_t *pend = c->prev_frame + width*c->avctx->height;
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g = c->stream;
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prev = c->prev_frame + offset;
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cur = c->frame;
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blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2);
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blk2 = 0;
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for (blk = 0; blk < blocks; blk++) {
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if (!(blk & 3)) {
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blocktypes = bytestream2_get_byte(&g);
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}
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switch (blocktypes & 0xC0) {
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case 0x00: //skip
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for (y = 0; y < 4; y++)
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if (check_line(prev + y*width, pstart, pend))
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memcpy(cur + y*width, prev + y*width, 4);
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else
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memset(cur + y*width, 0, 4);
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break;
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case 0x40:
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t = bytestream2_get_byte(&g);
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if (!t) { //raw block
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if (bytestream2_get_bytes_left(&g) < 16) {
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av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
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return AVERROR_INVALIDDATA;
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}
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for (y = 0; y < 4; y++)
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bytestream2_get_buffer(&g, cur + y * width, 4);
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} else { // motion compensation
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x = ((t & 0xF)^8) - 8;
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y = ((t >> 4) ^8) - 8;
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t = x + y*width;
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for (y = 0; y < 4; y++)
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if (check_line(prev + t + y*width, pstart, pend))
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memcpy(cur + y*width, prev + t + y*width, 4);
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else
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memset(cur + y*width, 0, 4);
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}
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break;
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case 0x80: // fill
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t = bytestream2_get_byte(&g);
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for (y = 0; y < 4; y++)
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memset(cur + y*width, t, 4);
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break;
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case 0xC0: // pattern fill
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t = bytestream2_get_byte(&g);
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pattype = t >> 6;
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pattern = vb_patterns[t & 0x3F];
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switch (pattype) {
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case 0:
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a = bytestream2_get_byte(&g);
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b = bytestream2_get_byte(&g);
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for (y = 0; y < 4; y++)
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for (x = 0; x < 4; x++, pattern >>= 1)
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cur[x + y*width] = (pattern & 1) ? b : a;
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break;
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case 1:
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pattern = ~pattern;
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case 2:
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a = bytestream2_get_byte(&g);
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for (y = 0; y < 4; y++)
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for (x = 0; x < 4; x++, pattern >>= 1)
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if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
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cur[x + y*width] = prev[x + y*width];
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else
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cur[x + y*width] = a;
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break;
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case 3:
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av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk);
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return AVERROR_INVALIDDATA;
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}
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break;
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}
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blocktypes <<= 2;
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cur += 4;
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prev += 4;
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blk2++;
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if (blk2 == (width >> 2)) {
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blk2 = 0;
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cur += width * 3;
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prev += width * 3;
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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_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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VBDecContext * const c = avctx->priv_data;
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AVFrame *frame = data;
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uint8_t *outptr, *srcptr;
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int i, j, ret;
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int flags;
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uint32_t size;
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int offset = 0;
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bytestream2_init(&c->stream, avpkt->data, avpkt->size);
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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flags = bytestream2_get_le16(&c->stream);
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if (flags & VB_HAS_GMC) {
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i = (int16_t)bytestream2_get_le16(&c->stream);
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j = (int16_t)bytestream2_get_le16(&c->stream);
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offset = i + j * avctx->width;
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}
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if (flags & VB_HAS_VIDEO) {
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size = bytestream2_get_le32(&c->stream);
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if(size > bytestream2_get_bytes_left(&c->stream)+4 || size<4){
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av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n");
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return -1;
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}
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vb_decode_framedata(c, offset);
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bytestream2_skip(&c->stream, size - 4);
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}
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if (flags & VB_HAS_PALETTE) {
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size = bytestream2_get_le32(&c->stream);
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vb_decode_palette(c, size);
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}
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memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
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frame->palette_has_changed = flags & VB_HAS_PALETTE;
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outptr = frame->data[0];
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srcptr = c->frame;
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for (i = 0; i < avctx->height; i++) {
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memcpy(outptr, srcptr, avctx->width);
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srcptr += avctx->width;
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outptr += frame->linesize[0];
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}
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FFSWAP(uint8_t*, c->frame, c->prev_frame);
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*got_frame = 1;
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/* always report that the buffer was completely consumed */
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return avpkt->size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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VBDecContext * const c = avctx->priv_data;
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c->avctx = avctx;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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c->frame = av_mallocz(avctx->width * avctx->height);
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c->prev_frame = av_mallocz(avctx->width * avctx->height);
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if (!c->frame || !c->prev_frame) {
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av_freep(&c->frame);
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av_freep(&c->prev_frame);
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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VBDecContext *c = avctx->priv_data;
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av_freep(&c->frame);
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av_freep(&c->prev_frame);
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return 0;
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}
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AVCodec ff_vb_decoder = {
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.name = "vb",
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.long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_VB,
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.priv_data_size = sizeof(VBDecContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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