| /* |
| * Beam Software VB decoder |
| * Copyright (c) 2007 Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * VB Video decoder |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| |
| enum VBFlags { |
| VB_HAS_GMC = 0x01, |
| VB_HAS_AUDIO = 0x04, |
| VB_HAS_VIDEO = 0x08, |
| VB_HAS_PALETTE = 0x10, |
| VB_HAS_LENGTH = 0x20 |
| }; |
| |
| typedef struct VBDecContext { |
| AVCodecContext *avctx; |
| |
| uint8_t *frame, *prev_frame; |
| uint32_t pal[AVPALETTE_COUNT]; |
| GetByteContext stream; |
| } VBDecContext; |
| |
| static const uint16_t vb_patterns[64] = { |
| 0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8, |
| 0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00, |
| 0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222, |
| 0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC, |
| 0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113, |
| 0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC, |
| 0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63, |
| 0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C |
| }; |
| |
| static void vb_decode_palette(VBDecContext *c, int data_size) |
| { |
| int start, size, i; |
| |
| start = bytestream2_get_byte(&c->stream); |
| size = (bytestream2_get_byte(&c->stream) - 1) & 0xFF; |
| if (start + size > 255) { |
| av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n"); |
| return; |
| } |
| if (size*3+2 > data_size) { |
| av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n"); |
| return; |
| } |
| for (i = start; i <= start + size; i++) |
| c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->stream); |
| } |
| |
| static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end) |
| { |
| return buf >= start && buf < end; |
| } |
| |
| static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end) |
| { |
| return buf >= start && (buf + 4) <= end; |
| } |
| |
| static int vb_decode_framedata(VBDecContext *c, int offset) |
| { |
| GetByteContext g; |
| uint8_t *prev, *cur; |
| int blk, blocks, t, blk2; |
| int blocktypes = 0; |
| int x, y, a, b; |
| int pattype, pattern; |
| const int width = c->avctx->width; |
| uint8_t *pstart = c->prev_frame; |
| uint8_t *pend = c->prev_frame + width*c->avctx->height; |
| |
| g = c->stream; |
| |
| prev = c->prev_frame + offset; |
| cur = c->frame; |
| |
| blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2); |
| blk2 = 0; |
| for (blk = 0; blk < blocks; blk++) { |
| if (!(blk & 3)) { |
| if (bytestream2_get_bytes_left(&g) < 1) { |
| av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| blocktypes = bytestream2_get_byte(&g); |
| } |
| switch (blocktypes & 0xC0) { |
| case 0x00: //skip |
| for (y = 0; y < 4; y++) |
| if (check_line(prev + y*width, pstart, pend)) |
| memcpy(cur + y*width, prev + y*width, 4); |
| else |
| memset(cur + y*width, 0, 4); |
| break; |
| case 0x40: |
| t = bytestream2_get_byte(&g); |
| if (!t) { //raw block |
| if (bytestream2_get_bytes_left(&g) < 16) { |
| av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| for (y = 0; y < 4; y++) |
| bytestream2_get_buffer(&g, cur + y * width, 4); |
| } else { // motion compensation |
| x = ((t & 0xF)^8) - 8; |
| y = ((t >> 4) ^8) - 8; |
| t = x + y*width; |
| for (y = 0; y < 4; y++) |
| if (check_line(prev + t + y*width, pstart, pend)) |
| memcpy(cur + y*width, prev + t + y*width, 4); |
| else |
| memset(cur + y*width, 0, 4); |
| } |
| break; |
| case 0x80: // fill |
| t = bytestream2_get_byte(&g); |
| for (y = 0; y < 4; y++) |
| memset(cur + y*width, t, 4); |
| break; |
| case 0xC0: // pattern fill |
| t = bytestream2_get_byte(&g); |
| pattype = t >> 6; |
| pattern = vb_patterns[t & 0x3F]; |
| switch (pattype) { |
| case 0: |
| a = bytestream2_get_byte(&g); |
| b = bytestream2_get_byte(&g); |
| for (y = 0; y < 4; y++) |
| for (x = 0; x < 4; x++, pattern >>= 1) |
| cur[x + y*width] = (pattern & 1) ? b : a; |
| break; |
| case 1: |
| pattern = ~pattern; |
| case 2: |
| a = bytestream2_get_byte(&g); |
| for (y = 0; y < 4; y++) |
| for (x = 0; x < 4; x++, pattern >>= 1) |
| if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend)) |
| cur[x + y*width] = prev[x + y*width]; |
| else |
| cur[x + y*width] = a; |
| break; |
| case 3: |
| av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk); |
| return AVERROR_INVALIDDATA; |
| } |
| break; |
| } |
| blocktypes <<= 2; |
| cur += 4; |
| prev += 4; |
| blk2++; |
| if (blk2 == (width >> 2)) { |
| blk2 = 0; |
| cur += width * 3; |
| prev += width * 3; |
| } |
| } |
| return 0; |
| } |
| |
| static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| VBDecContext * const c = avctx->priv_data; |
| AVFrame *frame = data; |
| uint8_t *outptr, *srcptr; |
| int i, j, ret; |
| int flags; |
| uint32_t size; |
| int offset = 0; |
| |
| if (avpkt->size < 2) |
| return AVERROR_INVALIDDATA; |
| |
| bytestream2_init(&c->stream, avpkt->data, avpkt->size); |
| |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| |
| flags = bytestream2_get_le16(&c->stream); |
| |
| if (flags & VB_HAS_GMC) { |
| i = (int16_t)bytestream2_get_le16(&c->stream); |
| j = (int16_t)bytestream2_get_le16(&c->stream); |
| if (FFABS(j) > avctx->height) { |
| av_log(avctx, AV_LOG_ERROR, "GMV out of range\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| offset = i + j * avctx->width; |
| } |
| if (flags & VB_HAS_VIDEO) { |
| size = bytestream2_get_le32(&c->stream); |
| if(size > bytestream2_get_bytes_left(&c->stream)+4 || size<4){ |
| av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n"); |
| return -1; |
| } |
| vb_decode_framedata(c, offset); |
| bytestream2_skip(&c->stream, size - 4); |
| } |
| if (flags & VB_HAS_PALETTE) { |
| size = bytestream2_get_le32(&c->stream); |
| vb_decode_palette(c, size); |
| } |
| |
| memcpy(frame->data[1], c->pal, AVPALETTE_SIZE); |
| frame->palette_has_changed = flags & VB_HAS_PALETTE; |
| |
| outptr = frame->data[0]; |
| srcptr = c->frame; |
| |
| for (i = 0; i < avctx->height; i++) { |
| memcpy(outptr, srcptr, avctx->width); |
| srcptr += avctx->width; |
| outptr += frame->linesize[0]; |
| } |
| |
| FFSWAP(uint8_t*, c->frame, c->prev_frame); |
| |
| *got_frame = 1; |
| |
| /* always report that the buffer was completely consumed */ |
| return avpkt->size; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| VBDecContext * const c = avctx->priv_data; |
| |
| c->avctx = avctx; |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| |
| c->frame = av_mallocz(avctx->width * avctx->height); |
| c->prev_frame = av_mallocz(avctx->width * avctx->height); |
| |
| if (!c->frame || !c->prev_frame) |
| return AVERROR(ENOMEM); |
| |
| return 0; |
| } |
| |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| VBDecContext *c = avctx->priv_data; |
| |
| av_freep(&c->frame); |
| av_freep(&c->prev_frame); |
| |
| return 0; |
| } |
| |
| AVCodec ff_vb_decoder = { |
| .name = "vb", |
| .long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_VB, |
| .priv_data_size = sizeof(VBDecContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, |
| }; |