dosbox native ZMBV decoder, courtesy of Kostya

Originally committed as revision 5000 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 470 insertions, 0 deletions

diff --git a/libavcodec/zmbv.c b/libavcodec/zmbv.c
new file mode 100644
index 0000000000..52a755fe97
--- /dev/null
+++ b/libavcodec/zmbv.c
@@ -0,0 +1,470 @@
+/*
+ * Zip Motion Blocks Video (ZMBV) decoder
+ * Copyright (c) 2006 Konstantin Shishkov
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+/**
+ * @file zmbv.c
+ * Zip Motion Blocks Video decoder
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "avcodec.h"
+
+#ifdef CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
+#define ZMBV_KEYFRAME 1
+#define ZMBV_DELTAPAL 2
+
+enum ZmbvFormat {
+    ZMBV_FMT_NONE  = 0,
+    ZMBV_FMT_1BPP  = 1,
+    ZMBV_FMT_2BPP  = 2,
+    ZMBV_FMT_4BPP  = 3,
+    ZMBV_FMT_8BPP  = 4,
+    ZMBV_FMT_15BPP = 5,
+    ZMBV_FMT_16BPP = 6,
+    ZMBV_FMT_24BPP = 7,
+    ZMBV_FMT_32BPP = 8
+};
+
+/*
+ * Decoder context
+ */
+typedef struct ZmbvContext {
+    AVCodecContext *avctx;
+    AVFrame pic;
+
+    int bpp;
+    unsigned int decomp_size;
+    uint8_t* decomp_buf;
+    uint8_t pal[768];
+    uint8_t *prev, *cur;
+    int width, height;
+    int fmt;
+    int comp;
+    int flags;
+    int bw, bh, bx, by;
+    int decomp_len;
+#ifdef CONFIG_ZLIB
+    z_stream zstream;
+#endif
+    int (*decode_intra)(struct ZmbvContext *c);
+    int (*decode_xor)(struct ZmbvContext *c);
+} ZmbvContext;
+
+/**
+ * Decode XOR'ed frame - 8bpp version
+ */
+
+static int zmbv_decode_xor_8(ZmbvContext *c)
+{
+    uint8_t *src = c->decomp_buf;
+    uint8_t *output, *prev;
+    int8_t *mvec;
+    int x, y;
+    int d, dx, dy, bw2, bh2;
+    int block;
+    int i, j;
+    int mx, my;
+
+    output = c->cur;
+    prev = c->prev;
+
+    if(c->flags & ZMBV_DELTAPAL){
+        for(i = 0; i < 768; i++)
+            c->pal[i] ^= *src++;
+    }
+
+    mvec = (int8_t*)src;
+    src += ((c->bx * c->by * 2 + 3) & ~3);
+
+    block = 0;
+    for(y = 0; y < c->height; y += c->bh) {
+        bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
+        for(x = 0; x < c->width; x += c->bw) {
+            uint8_t *out, *tprev;
+
+            d = mvec[block] & 1;
+            dx = mvec[block] >> 1;
+            dy = mvec[block + 1] >> 1;
+            block += 2;
+
+            bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
+
+            /* copy block - motion vectors out of bounds are used to zero blocks */
+            out = output + x;
+            tprev = prev + x + dx + dy * c->width;
+            mx = x + dx;
+            my = y + dy;
+            for(j = 0; j < bh2; j++){
+                if((my + j < 0) || (my + j >= c->height)) {
+                    memset(out, 0, bw2);
+                } else {
+                    for(i = 0; i < bw2; i++){
+                        if((mx + i < 0) || (mx + i >= c->width))
+                            out[i] = 0;
+                        else
+                            out[i] = tprev[i];
+                    }
+                }
+                out += c->width;
+                tprev += c->width;
+            }
+
+            if(d) { /* apply XOR'ed difference */
+                out = output + x;
+                for(j = 0; j < bh2; j++){
+                    for(i = 0; i < bw2; i++)
+                        out[i] ^= *src++;
+                    out += c->width;
+                }
+            }
+        }
+        output += c->width * c->bh;
+        prev += c->width * c->bh;
+    }
+    if(src - c->decomp_buf != c->decomp_len)
+        av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
+    return 0;
+}
+
+/**
+ * Decode XOR'ed frame - 24bpp version
+ */
+
+static int zmbv_decode_xor_24(ZmbvContext *c)
+{
+    uint8_t *src = c->decomp_buf;
+    uint8_t *output, *prev;
+    int8_t *mvec;
+    int x, y;
+    int d, dx, dy, bw2, bh2;
+    int block;
+    int i, j;
+    int mx, my;
+    int stride;
+
+    output = c->cur;
+    prev = c->prev;
+
+    stride = c->width * 3;
+    mvec = (int8_t*)src;
+    src += ((c->bx * c->by * 2 + 3) & ~3);
+
+    block = 0;
+    for(y = 0; y < c->height; y += c->bh) {
+        bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
+        for(x = 0; x < c->width; x += c->bw) {
+            uint8_t *out, *tprev;
+
+            d = mvec[block] & 1;
+            dx = mvec[block] >> 1;
+            dy = mvec[block + 1] >> 1;
+            block += 2;
+
+            bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
+
+            /* copy block - motion vectors out of bounds are used to zero blocks */
+            out = output + x * 3;
+            tprev = prev + (x + dx) * 3 + dy * stride;
+            mx = x + dx;
+            my = y + dy;
+            for(j = 0; j < bh2; j++){
+                if((my + j < 0) || (my + j >= c->height)) {
+                    memset(out, 0, bw2 * 3);
+                } else {
+                    for(i = 0; i < bw2; i++){
+                        if((mx + i < 0) || (mx + i >= c->width)) {
+                            out[i * 3 + 0] = 0;
+                            out[i * 3 + 1] = 0;
+                            out[i * 3 + 2] = 0;
+                        } else {
+                            out[i * 3 + 0] = tprev[i * 3 + 0];
+                            out[i * 3 + 1] = tprev[i * 3 + 1];
+                            out[i * 3 + 2] = tprev[i * 3 + 2];
+                        }
+                    }
+                }
+                out += stride;
+                tprev += stride;
+            }
+
+            if(d) { /* apply XOR'ed difference */
+                out = output + x * 3;
+                for(j = 0; j < bh2; j++){
+                    for(i = 0; i < bw2; i++) {
+                        out[i * 3 + 0] ^= *src++;
+                        out[i * 3 + 1] ^= *src++;
+                        out[i * 3 + 2] ^= *src++;
+                    }
+                    out += stride;
+                }
+            }
+        }
+        output += stride * c->bh;
+        prev += stride * c->bh;
+    }
+    if(src - c->decomp_buf != c->decomp_len)
+        av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
+    return 0;
+}
+
+/**
+ * Decode intraframe
+ */
+static int zmbv_decode_intra(ZmbvContext *c)
+{
+    uint8_t *src = c->decomp_buf;
+
+    /* make the palette available on the way out */
+    if (c->fmt == ZMBV_FMT_8BPP) {
+        memcpy(c->pal, src, 768);
+        src += 768;
+    }
+
+    memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+{
+    ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
+    uint8_t *outptr;
+#ifdef CONFIG_ZLIB
+    int zret = Z_OK; // Zlib return code
+#endif
+    int len = buf_size;
+    int hi_ver, lo_ver;
+
+    if(c->pic.data[0])
+            avctx->release_buffer(avctx, &c->pic);
+
+    c->pic.reference = 1;
+    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
+    if(avctx->get_buffer(avctx, &c->pic) < 0){
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    outptr = c->pic.data[0]; // Output image pointer
+
+    /* parse header */
+    c->flags = buf[0];
+    buf++; len--;
+    if(c->flags & ZMBV_KEYFRAME) {
+        hi_ver = buf[0];
+        lo_ver = buf[1];
+        c->comp = buf[2];
+        c->fmt = buf[3];
+        c->bw = buf[4];
+        c->bh = buf[5];
+
+        buf += 6;
+        len -= 6;
+        av_log(avctx, AV_LOG_DEBUG, "Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n",c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh);
+        if(hi_ver != 0 || lo_ver != 1) {
+            av_log(avctx, AV_LOG_ERROR, "Unsupported version %i.%i\n", hi_ver, lo_ver);
+            return -1;
+        }
+        if(c->bw == 0 || c->bh == 0) {
+            av_log(avctx, AV_LOG_ERROR, "Unsupported block size %ix%i\n", c->bw, c->bh);
+        }
+        if(c->comp != 0 && c->comp != 1) {
+            av_log(avctx, AV_LOG_ERROR, "Unsupported compression type %i\n", c->comp);
+            return -1;
+        }
+        if(c->fmt != ZMBV_FMT_8BPP && c->fmt != ZMBV_FMT_24BPP) {
+            av_log(avctx, AV_LOG_ERROR, "Unsupported (for now) format %i\n", c->fmt);
+            return -1;
+        }
+        zret = inflateReset(&c->zstream);
+        if (zret != Z_OK) {
+            av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
+            return -1;
+        }
+        if(c->fmt == ZMBV_FMT_8BPP) {
+            c->bpp = 8;
+            c->decode_intra = zmbv_decode_intra;
+            c->decode_xor = zmbv_decode_xor_8;
+        } else {
+            c->bpp = 24;
+            c->decode_intra = zmbv_decode_intra;
+            c->decode_xor = zmbv_decode_xor_24;
+        }
+        c->cur = av_realloc(c->cur, avctx->width * avctx->height * (c->bpp / 8));
+        c->prev = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8));
+        c->bx = (c->width + c->bw - 1) / c->bw;
+        c->by = (c->height+ c->bh - 1) / c->bh;
+    }
+
+    if(c->fmt == 0) {
+        av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
+        return -1;
+    }
+
+    if(c->comp == 0) { //Uncompressed data
+        memcpy(c->decomp_buf, buf, len);
+        c->decomp_size = 1;
+    } else { // ZLIB-compressed data
+#ifdef CONFIG_ZLIB
+        c->zstream.total_in = c->zstream.total_out = 0;
+        c->zstream.next_in = buf;
+        c->zstream.avail_in = len;
+        c->zstream.next_out = c->decomp_buf;
+        c->zstream.avail_out = c->decomp_size;
+        inflate(&c->zstream, Z_FINISH);
+        c->decomp_len = c->zstream.total_out;
+#else
+        av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
+        return -1;
+#endif
+    }
+    if(c->flags & ZMBV_KEYFRAME) {
+        c->pic.key_frame = 1;
+        c->pic.pict_type = FF_I_TYPE;
+        c->decode_intra(c);
+    } else {
+        c->pic.key_frame = 0;
+        c->pic.pict_type = FF_P_TYPE;
+        c->decode_xor(c);
+    }
+
+    /* update frames */
+    {
+        uint8_t *out, *src;
+        int i, j;
+
+        out = c->pic.data[0];
+        src = c->cur;
+        for(j = 0; j < c->height; j++) {
+            for(i = 0; i < c->width; i++) {
+                out[i * 3 + 0] = c->pal[(*src) * 3 + 0];
+                out[i * 3 + 1] = c->pal[(*src) * 3 + 1];
+                out[i * 3 + 2] = c->pal[(*src) * 3 + 2];
+                *src++;
+            }
+            out += c->pic.linesize[0];
+        }
+        memcpy(c->prev, c->cur, c->width * c->height);
+    }
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = c->pic;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+
+
+/*
+ *
+ * Init zmbv decoder
+ *
+ */
+static int decode_init(AVCodecContext *avctx)
+{
+    ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
+    int zret; // Zlib return code
+
+    c->avctx = avctx;
+    avctx->has_b_frames = 0;
+
+    c->pic.data[0] = NULL;
+    c->width = avctx->width;
+    c->height = avctx->height;
+
+    if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
+        return 1;
+    }
+    c->bpp = avctx->bits_per_sample;
+
+#ifdef CONFIG_ZLIB
+    // Needed if zlib unused or init aborted before inflateInit
+    memset(&(c->zstream), 0, sizeof(z_stream));
+#else
+    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
+    return 1;
+#endif
+    avctx->pix_fmt = PIX_FMT_RGB24;
+    c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
+
+    /* Allocate decompression buffer */
+    if (c->decomp_size) {
+        if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
+            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
+            return 1;
+        }
+    }
+
+#ifdef CONFIG_ZLIB
+    c->zstream.zalloc = Z_NULL;
+    c->zstream.zfree = Z_NULL;
+    c->zstream.opaque = Z_NULL;
+    zret = inflateInit(&(c->zstream));
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
+        return 1;
+    }
+#endif
+
+    return 0;
+}
+
+
+
+/*
+ *
+ * Uninit zmbv decoder
+ *
+ */
+static int decode_end(AVCodecContext *avctx)
+{
+    ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
+
+    av_freep(&c->decomp_buf);
+
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+#ifdef CONFIG_ZLIB
+    inflateEnd(&(c->zstream));
+#endif
+    if(c->cur)
+        av_freep(&c->cur);
+    if(c->prev)
+        av_freep(&c->prev);
+
+    return 0;
+}
+
+AVCodec zmbv_decoder = {
+    "zmbv",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_ZMBV,
+    sizeof(ZmbvContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame
+};
+