Beam Software SIFF demuxer and video decoder

Originally committed as revision 10833 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 282 insertions, 0 deletions

diff --git a/libavcodec/vb.c b/libavcodec/vb.c
new file mode 100644
index 0000000000..5854a0f63d
--- /dev/null
+++ b/libavcodec/vb.c
@@ -0,0 +1,282 @@
+/*
+ * 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];
+    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, 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, 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
+};
+