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Diffstat (limited to 'contrib/ffmpeg/libavcodec/vb.c')
-rw-r--r--contrib/ffmpeg/libavcodec/vb.c282
1 files changed, 0 insertions, 282 deletions
diff --git a/contrib/ffmpeg/libavcodec/vb.c b/contrib/ffmpeg/libavcodec/vb.c
deleted file mode 100644
index 7a2e00705..000000000
--- a/contrib/ffmpeg/libavcodec/vb.c
+++ /dev/null
@@ -1,282 +0,0 @@
-/*
- * 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.c
- * VB Video decoder
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "avcodec.h"
-#include "bytestream.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;
- AVFrame pic;
-
- uint8_t *frame, *prev_frame;
- uint32_t pal[256];
- const uint8_t *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 start, size, i;
-
- start = bytestream_get_byte(&c->stream);
- size = (bytestream_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;
- }
- for(i = start; i <= start + size; i++)
- c->pal[i] = bytestream_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, const uint8_t *buf, int offset)
-{
- 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;
-
- 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))
- blocktypes = bytestream_get_byte(&buf);
- 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 = bytestream_get_byte(&buf);
- if(!t){ //raw block
- for(y = 0; y < 4; y++)
- memcpy(cur + y*width, buf + y*4, 4);
- buf += 16;
- }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 = bytestream_get_byte(&buf);
- for(y = 0; y < 4; y++)
- memset(cur + y*width, t, 4);
- break;
- case 0xC0: // pattern fill
- t = bytestream_get_byte(&buf);
- pattype = t >> 6;
- pattern = vb_patterns[t & 0x3F];
- switch(pattype){
- case 0:
- a = bytestream_get_byte(&buf);
- b = bytestream_get_byte(&buf);
- 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 = bytestream_get_byte(&buf);
- 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 -1;
- }
- 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 *data_size, const uint8_t *buf, int buf_size)
-{
- VBDecContext * const c = avctx->priv_data;
- uint8_t *outptr, *srcptr;
- int i, j;
- int flags;
- uint32_t size;
- int rest = buf_size;
- int offset = 0;
-
- c->stream = buf;
- flags = bytestream_get_le16(&c->stream);
- rest -= 2;
-
- if(flags & VB_HAS_GMC){
- i = (int16_t)bytestream_get_le16(&c->stream);
- j = (int16_t)bytestream_get_le16(&c->stream);
- offset = i + j * avctx->width;
- rest -= 4;
- }
- if(flags & VB_HAS_VIDEO){
- size = bytestream_get_le32(&c->stream);
- if(size > rest){
- av_log(avctx, AV_LOG_ERROR, "Frame size is too big\n");
- return -1;
- }
- vb_decode_framedata(c, c->stream, offset);
- c->stream += size - 4;
- rest -= size;
- }
- if(flags & VB_HAS_PALETTE){
- size = bytestream_get_le32(&c->stream);
- if(size > rest){
- av_log(avctx, AV_LOG_ERROR, "Palette size is too big\n");
- return -1;
- }
- vb_decode_palette(c);
- rest -= size;
- }
-
- memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
- c->pic.palette_has_changed = flags & VB_HAS_PALETTE;
-
- outptr = c->pic.data[0];
- srcptr = c->frame;
-
- for(i = 0; i < avctx->height; i++){
- memcpy(outptr, srcptr, avctx->width);
- srcptr += avctx->width;
- outptr += c->pic.linesize[0];
- }
-
- FFSWAP(uint8_t*, c->frame, c->prev_frame);
-
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = c->pic;
-
- /* always report that the buffer was completely consumed */
- return buf_size;
-}
-
-static int decode_init(AVCodecContext *avctx)
-{
- VBDecContext * const c = avctx->priv_data;
-
- c->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_PAL8;
-
- if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
- return -1;
- }
-
- c->pic.reference = 1;
- if(avctx->get_buffer(avctx, &c->pic) < 0){
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
- }
-
- c->frame = av_malloc( avctx->width * avctx->height);
- c->prev_frame = av_malloc( avctx->width * avctx->height);
-
- return 0;
-}
-
-static int decode_end(AVCodecContext *avctx)
-{
- VBDecContext *c = avctx->priv_data;
-
- av_freep(&c->frame);
- av_freep(&c->prev_frame);
- if(c->pic.data[0])
- avctx->release_buffer(avctx, &c->pic);
-
- return 0;
-}
-
-AVCodec vb_decoder = {
- "vb",
- CODEC_TYPE_VIDEO,
- CODEC_ID_VB,
- sizeof(VBDecContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame
-};
-
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-01 18:05:49 +0000