adding ffmpeg specific version

1 files changed, 331 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/dxa.c b/ffmpeg1/libavcodec/dxa.c
new file mode 100644
index 0000000..2286f33
--- /dev/null
+++ b/ffmpeg1/libavcodec/dxa.c
@@ -0,0 +1,331 @@
+/*
+ * Feeble Files/ScummVM DXA 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
+ * DXA Video decoder
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "bytestream.h"
+#include "avcodec.h"
+#include "internal.h"
+
+#include <zlib.h>
+
+/*
+ * Decoder context
+ */
+typedef struct DxaDecContext {
+    AVFrame prev;
+
+    int dsize;
+    uint8_t *decomp_buf;
+    uint32_t pal[256];
+} DxaDecContext;
+
+static const int shift1[6] = { 0, 8, 8, 8, 4, 4 };
+static const int shift2[6] = { 0, 0, 8, 4, 0, 4 };
+
+static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst,
+                     int stride, uint8_t *src, uint8_t *ref)
+{
+    uint8_t *code, *data, *mv, *msk, *tmp, *tmp2;
+    int i, j, k;
+    int type, x, y, d, d2;
+    uint32_t mask;
+
+    code = src  + 12;
+    data = code + ((avctx->width * avctx->height) >> 4);
+    mv   = data + AV_RB32(src + 0);
+    msk  = mv   + AV_RB32(src + 4);
+
+    for(j = 0; j < avctx->height; j += 4){
+        for(i = 0; i < avctx->width; i += 4){
+            tmp  = dst + i;
+            tmp2 = ref + i;
+            type = *code++;
+            switch(type){
+            case 4: // motion compensation
+                x = (*mv) >> 4;    if(x & 8) x = 8 - x;
+                y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
+                tmp2 += x + y*stride;
+            case 0: // skip
+            case 5: // skip in method 12
+                for(y = 0; y < 4; y++){
+                    memcpy(tmp, tmp2, 4);
+                    tmp  += stride;
+                    tmp2 += stride;
+                }
+                break;
+            case 1:  // masked change
+            case 10: // masked change with only half of pixels changed
+            case 11: // cases 10-15 are for method 12 only
+            case 12:
+            case 13:
+            case 14:
+            case 15:
+                if(type == 1){
+                    mask = AV_RB16(msk);
+                    msk += 2;
+                }else{
+                    type -= 10;
+                    mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]);
+                    msk++;
+                }
+                for(y = 0; y < 4; y++){
+                    for(x = 0; x < 4; x++){
+                        tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x];
+                        mask <<= 1;
+                    }
+                    tmp  += stride;
+                    tmp2 += stride;
+                }
+                break;
+            case 2: // fill block
+                for(y = 0; y < 4; y++){
+                    memset(tmp, data[0], 4);
+                    tmp += stride;
+                }
+                data++;
+                break;
+            case 3: // raw block
+                for(y = 0; y < 4; y++){
+                    memcpy(tmp, data, 4);
+                    data += 4;
+                    tmp  += stride;
+                }
+                break;
+            case 8: // subblocks - method 13 only
+                mask = *msk++;
+                for(k = 0; k < 4; k++){
+                    d  = ((k & 1) << 1) + ((k & 2) * stride);
+                    d2 = ((k & 1) << 1) + ((k & 2) * stride);
+                    tmp2 = ref + i + d2;
+                    switch(mask & 0xC0){
+                    case 0x80: // motion compensation
+                        x = (*mv) >> 4;    if(x & 8) x = 8 - x;
+                        y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
+                        tmp2 += x + y*stride;
+                    case 0x00: // skip
+                        tmp[d + 0         ] = tmp2[0];
+                        tmp[d + 1         ] = tmp2[1];
+                        tmp[d + 0 + stride] = tmp2[0 + stride];
+                        tmp[d + 1 + stride] = tmp2[1 + stride];
+                        break;
+                    case 0x40: // fill
+                        tmp[d + 0         ] = data[0];
+                        tmp[d + 1         ] = data[0];
+                        tmp[d + 0 + stride] = data[0];
+                        tmp[d + 1 + stride] = data[0];
+                        data++;
+                        break;
+                    case 0xC0: // raw
+                        tmp[d + 0         ] = *data++;
+                        tmp[d + 1         ] = *data++;
+                        tmp[d + 0 + stride] = *data++;
+                        tmp[d + 1 + stride] = *data++;
+                        break;
+                    }
+                    mask <<= 2;
+                }
+                break;
+            case 32: // vector quantization - 2 colors
+                mask = AV_RB16(msk);
+                msk += 2;
+                for(y = 0; y < 4; y++){
+                    for(x = 0; x < 4; x++){
+                        tmp[x] = data[mask & 1];
+                        mask >>= 1;
+                    }
+                    tmp  += stride;
+                    tmp2 += stride;
+                }
+                data += 2;
+                break;
+            case 33: // vector quantization - 3 or 4 colors
+            case 34:
+                mask = AV_RB32(msk);
+                msk += 4;
+                for(y = 0; y < 4; y++){
+                    for(x = 0; x < 4; x++){
+                        tmp[x] = data[mask & 3];
+                        mask >>= 2;
+                    }
+                    tmp  += stride;
+                    tmp2 += stride;
+                }
+                data += type - 30;
+                break;
+            default:
+                av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type);
+                return AVERROR_INVALIDDATA;
+            }
+        }
+        dst += stride * 4;
+        ref += stride * 4;
+    }
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
+{
+    AVFrame *frame = data;
+    DxaDecContext * const c = avctx->priv_data;
+    uint8_t *outptr, *srcptr, *tmpptr;
+    unsigned long dsize;
+    int i, j, compr, ret;
+    int stride;
+    int pc = 0;
+    GetByteContext gb;
+
+    bytestream2_init(&gb, avpkt->data, avpkt->size);
+
+    /* make the palette available on the way out */
+    if (bytestream2_peek_le32(&gb) == MKTAG('C','M','A','P')) {
+        bytestream2_skip(&gb, 4);
+        for(i = 0; i < 256; i++){
+            c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&gb);
+        }
+        pc = 1;
+    }
+
+    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+        return ret;
+    memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
+    frame->palette_has_changed = pc;
+
+    outptr = frame->data[0];
+    srcptr = c->decomp_buf;
+    tmpptr = c->prev.data[0];
+    stride = frame->linesize[0];
+
+    if (bytestream2_get_le32(&gb) == MKTAG('N','U','L','L'))
+        compr = -1;
+    else
+        compr = bytestream2_get_byte(&gb);
+
+    dsize = c->dsize;
+    if (compr != 4 && compr != -1) {
+        bytestream2_skip(&gb, 4);
+        if (uncompress(c->decomp_buf, &dsize, avpkt->data + bytestream2_tell(&gb),
+                       bytestream2_get_bytes_left(&gb)) != Z_OK) {
+            av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n");
+            return AVERROR_UNKNOWN;
+        }
+    }
+    switch(compr){
+    case -1:
+        frame->key_frame = 0;
+        frame->pict_type = AV_PICTURE_TYPE_P;
+        if(c->prev.data[0])
+            memcpy(frame->data[0], c->prev.data[0], frame->linesize[0] * avctx->height);
+        else{ // Should happen only when first frame is 'NULL'
+            memset(frame->data[0], 0, frame->linesize[0] * avctx->height);
+            frame->key_frame = 1;
+            frame->pict_type = AV_PICTURE_TYPE_I;
+        }
+        break;
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+        frame->key_frame = !(compr & 1);
+        frame->pict_type = (compr & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
+        for(j = 0; j < avctx->height; j++){
+            if((compr & 1) && tmpptr){
+                for(i = 0; i < avctx->width; i++)
+                    outptr[i] = srcptr[i] ^ tmpptr[i];
+                tmpptr += stride;
+            }else
+                memcpy(outptr, srcptr, avctx->width);
+            outptr += stride;
+            srcptr += avctx->width;
+        }
+        break;
+    case 12: // ScummVM coding
+    case 13:
+        frame->key_frame = 0;
+        frame->pict_type = AV_PICTURE_TYPE_P;
+        if (!c->prev.data[0]) {
+            av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n");
+            return AVERROR_INVALIDDATA;
+        }
+        decode_13(avctx, c, frame->data[0], frame->linesize[0], srcptr, c->prev.data[0]);
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", compr);
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_frame_unref(&c->prev);
+    if ((ret = av_frame_ref(&c->prev, frame)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    /* always report that the buffer was completely consumed */
+    return avpkt->size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    DxaDecContext * const c = avctx->priv_data;
+
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    avcodec_get_frame_defaults(&c->prev);
+
+    c->dsize = avctx->width * avctx->height * 2;
+    c->decomp_buf = av_malloc(c->dsize);
+    if (!c->decomp_buf) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    DxaDecContext * const c = avctx->priv_data;
+
+    av_freep(&c->decomp_buf);
+    av_frame_unref(&c->prev);
+
+    return 0;
+}
+
+AVCodec ff_dxa_decoder = {
+    .name           = "dxa",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_DXA,
+    .priv_data_size = sizeof(DxaDecContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"),
+};