path: root/contrib/ffmpeg/A04-dxtory.patch

diff --git a/libavcodec/dxtory.c b/libavcodec/dxtory.c
index 23a3c6f..0a6f331 100644
--- a/libavcodec/dxtory.c
+++ b/libavcodec/dxtory.c
@@ -192,6 +192,56 @@ static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
     return val;
 }
 
+static int check_slice_size(AVCodecContext *avctx,
+                            const uint8_t *src, int src_size,
+                            int slice_size, int off)
+{
+    int cur_slice_size;
+
+    if (slice_size > src_size - off) {
+        av_log(avctx, AV_LOG_ERROR,
+               "invalid slice size %"PRIu32" (only %"PRIu32" bytes left)\n",
+               slice_size, src_size - off);
+        return AVERROR_INVALIDDATA;
+    }
+    if (slice_size <= 16) {
+        av_log(avctx, AV_LOG_ERROR, "invalid slice size %"PRIu32"\n",
+               slice_size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    cur_slice_size = AV_RL32(src + off);
+    if (cur_slice_size != slice_size - 16) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Slice sizes mismatch: got %"PRIu32" instead of %"PRIu32"\n",
+               cur_slice_size, slice_size - 16);
+    }
+
+    return 0;
+}
+
+static int load_buffer(AVCodecContext *avctx,
+                       const uint8_t *src, int src_size,
+                       GetByteContext *gb,
+                       int *nslices, int *off)
+{
+    bytestream2_init(gb, src, src_size);
+    *nslices = bytestream2_get_le16(gb);
+    *off = FFALIGN(*nslices * 4 + 2, 16);
+    if (src_size < *off) {
+        av_log(avctx, AV_LOG_ERROR, "no slice data\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (!*nslices) {
+        avpriv_request_sample(avctx, "%d slices for %dx%d", *nslices,
+                              avctx->width, avctx->height);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    return 0;
+}
+
 static inline uint8_t decode_sym_565(GetBitContext *gb, uint8_t lru[8],
                                      int bits)
 {
@@ -210,185 +260,182 @@ static inline uint8_t decode_sym_565(GetBitContext *gb, uint8_t lru[8],
     return val;
 }
 
-static int dx2_decode_slice_565(GetBitContext *gb, int width, int height,
-                                uint8_t *dst, int stride, int is_565)
-{
-    int x, y;
-    int r, g, b;
-    uint8_t lru[3][8];
-
-    memcpy(lru[0], def_lru_555, 8 * sizeof(*def_lru));
-    memcpy(lru[1], is_565 ? def_lru_565 : def_lru_555, 8 * sizeof(*def_lru));
-    memcpy(lru[2], def_lru_555, 8 * sizeof(*def_lru));
-
-    for (y = 0; y < height; y++) {
-        for (x = 0; x < width; x++) {
-            b = decode_sym_565(gb, lru[0], 5);
-            g = decode_sym_565(gb, lru[1], is_565 ? 6 : 5);
-            r = decode_sym_565(gb, lru[2], 5);
-            dst[x * 3 + 0] = (r << 3) | (r >> 2);
-            dst[x * 3 + 1] = is_565 ? (g << 2) | (g >> 4) : (g << 3) | (g >> 2);
-            dst[x * 3 + 2] = (b << 3) | (b >> 2);
-        }
-
-        dst += stride;
-    }
+typedef int (*decode_slice_func)(GetBitContext *gb, AVFrame *frame,
+                                 int line, int height, uint8_t lru[3][8]);
 
-    return 0;
-}
+typedef void (*setup_lru_func)(uint8_t lru[3][8]);
 
-static int dxtory_decode_v2_565(AVCodecContext *avctx, AVFrame *pic,
-                                const uint8_t *src, int src_size, int is_565)
+static int dxtory_decode_v2(AVCodecContext *avctx, AVFrame *pic,
+                            const uint8_t *src, int src_size,
+                            decode_slice_func decode_slice,
+                            setup_lru_func setup_lru,
+                            enum AVPixelFormat fmt)
 {
     GetByteContext gb;
     GetBitContext  gb2;
-    int nslices, slice, slice_height;
+    int nslices, slice, line = 0;
     uint32_t off, slice_size;
-    uint8_t *dst;
+    uint8_t lru[3][8];
     int ret;
 
-    bytestream2_init(&gb, src, src_size);
-    nslices = bytestream2_get_le16(&gb);
-    off = FFALIGN(nslices * 4 + 2, 16);
-    if (src_size < off) {
-        av_log(avctx, AV_LOG_ERROR, "no slice data\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (!nslices || avctx->height % nslices) {
-        avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
-                              avctx->width, avctx->height);
-        return AVERROR_PATCHWELCOME;
-    }
+    ret = load_buffer(avctx, src, src_size, &gb, &nslices, &off);
+    if (ret < 0)
+        return ret;
 
-    slice_height = avctx->height / nslices;
-    avctx->pix_fmt = AV_PIX_FMT_RGB24;
+    avctx->pix_fmt = fmt;
     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
         return ret;
 
-    dst = pic->data[0];
     for (slice = 0; slice < nslices; slice++) {
         slice_size = bytestream2_get_le32(&gb);
-        if (slice_size > src_size - off) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "invalid slice size %"PRIu32" (only %"PRIu32" bytes left)\n",
-                   slice_size, src_size - off);
-            return AVERROR_INVALIDDATA;
-        }
-        if (slice_size <= 16) {
-            av_log(avctx, AV_LOG_ERROR, "invalid slice size %"PRIu32"\n", slice_size);
-            return AVERROR_INVALIDDATA;
-        }
 
-        if (AV_RL32(src + off) != slice_size - 16) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "Slice sizes mismatch: got %"PRIu32" instead of %"PRIu32"\n",
-                   AV_RL32(src + off), slice_size - 16);
-        }
+        setup_lru(lru);
+
+        ret = check_slice_size(avctx, src, src_size, slice_size, off);
+        if (ret < 0)
+            return ret;
+
         init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
-        dx2_decode_slice_565(&gb2, avctx->width, slice_height, dst,
-                             pic->linesize[0], is_565);
 
-        dst += pic->linesize[0] * slice_height;
+        line += decode_slice(&gb2, pic, line, avctx->height - line, lru);
+
         off += slice_size;
     }
 
+    if (avctx->height - line) {
+        av_log(avctx, AV_LOG_VERBOSE,
+               "Not enough slice data available, "
+               "cropping the frame by %d pixels\n",
+                avctx->height - line);
+        avctx->height = line;
+    }
+
     return 0;
 }
 
-static int dx2_decode_slice_rgb(GetBitContext *gb, int width, int height,
-                                uint8_t *dst, int stride)
+av_always_inline
+static int dx2_decode_slice_5x5(GetBitContext *gb, AVFrame *frame,
+                                int line, int left, uint8_t lru[3][8],
+                                int is_565)
 {
-    int x, y, i;
-    uint8_t lru[3][8];
-
-    for (i = 0; i < 3; i++)
-        memcpy(lru[i], def_lru, 8 * sizeof(*def_lru));
+    int x, y;
+    int r, g, b;
+    int width    = frame->width;
+    int stride   = frame->linesize[0];
+    uint8_t *dst = frame->data[0] + stride * line;
 
-    for (y = 0; y < height; y++) {
+    for (y = 0; y < left && get_bits_left(gb) > 16; y++) {
         for (x = 0; x < width; x++) {
-            dst[x * 3 + 0] = decode_sym(gb, lru[0]);
-            dst[x * 3 + 1] = decode_sym(gb, lru[1]);
-            dst[x * 3 + 2] = decode_sym(gb, lru[2]);
+            b = decode_sym_565(gb, lru[0], 5);
+            g = decode_sym_565(gb, lru[1], is_565 ? 6 : 5);
+            r = decode_sym_565(gb, lru[2], 5);
+            dst[x * 3 + 0] = (r << 3) | (r >> 2);
+            dst[x * 3 + 1] = is_565 ? (g << 2) | (g >> 4) : (g << 3) | (g >> 2);
+            dst[x * 3 + 2] = (b << 3) | (b >> 2);
         }
 
         dst += stride;
     }
 
-    return 0;
+    return y;
 }
 
-static int dxtory_decode_v2_rgb(AVCodecContext *avctx, AVFrame *pic,
-                                const uint8_t *src, int src_size)
+static void setup_lru_555(uint8_t lru[3][8])
 {
-    GetByteContext gb;
-    GetBitContext  gb2;
-    int nslices, slice, slice_height;
-    uint32_t off, slice_size;
-    uint8_t *dst;
-    int ret;
+    memcpy(lru[0], def_lru_555, 8 * sizeof(*def_lru));
+    memcpy(lru[1], def_lru_555, 8 * sizeof(*def_lru));
+    memcpy(lru[2], def_lru_555, 8 * sizeof(*def_lru));
+}
 
-    bytestream2_init(&gb, src, src_size);
-    nslices = bytestream2_get_le16(&gb);
-    off = FFALIGN(nslices * 4 + 2, 16);
-    if (src_size < off) {
-        av_log(avctx, AV_LOG_ERROR, "no slice data\n");
-        return AVERROR_INVALIDDATA;
-    }
+static void setup_lru_565(uint8_t lru[3][8])
+{
+    memcpy(lru[0], def_lru_555, 8 * sizeof(*def_lru));
+    memcpy(lru[1], def_lru_565, 8 * sizeof(*def_lru));
+    memcpy(lru[2], def_lru_555, 8 * sizeof(*def_lru));
+}
 
-    if (!nslices || avctx->height % nslices) {
-        avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
-                              avctx->width, avctx->height);
-        return AVERROR_PATCHWELCOME;
-    }
+static int dx2_decode_slice_555(GetBitContext *gb, AVFrame *frame,
+                                int line, int left, uint8_t lru[3][8])
+{
+    return dx2_decode_slice_5x5(gb, frame, line, left, lru, 0);
+}
 
-    slice_height = avctx->height / nslices;
-    avctx->pix_fmt = AV_PIX_FMT_BGR24;
-    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
-        return ret;
+static int dx2_decode_slice_565(GetBitContext *gb, AVFrame *frame,
+                                int line, int left, uint8_t lru[3][8])
+{
+    return dx2_decode_slice_5x5(gb, frame, line, left, lru, 1);
+}
 
-    dst = pic->data[0];
-    for (slice = 0; slice < nslices; slice++) {
-        slice_size = bytestream2_get_le32(&gb);
-        if (slice_size > src_size - off) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "invalid slice size %"PRIu32" (only %"PRIu32" bytes left)\n",
-                   slice_size, src_size - off);
-            return AVERROR_INVALIDDATA;
-        }
-        if (slice_size <= 16) {
-            av_log(avctx, AV_LOG_ERROR, "invalid slice size %"PRIu32"\n",
-                   slice_size);
-            return AVERROR_INVALIDDATA;
-        }
+static int dxtory_decode_v2_565(AVCodecContext *avctx, AVFrame *pic,
+                                const uint8_t *src, int src_size, int is_565)
+{
+    enum AVPixelFormat fmt = AV_PIX_FMT_RGB24;
+    if (is_565)
+        return dxtory_decode_v2(avctx, pic, src, src_size,
+                                dx2_decode_slice_565,
+                                setup_lru_565,
+                                fmt);
+    else
+        return dxtory_decode_v2(avctx, pic, src, src_size,
+                                dx2_decode_slice_555,
+                                setup_lru_555,
+                                fmt);
+}
+
+static int dx2_decode_slice_rgb(GetBitContext *gb, AVFrame *frame,
+                                int line, int left, uint8_t lru[3][8])
+{
+    int x, y;
+    int width    = frame->width;
+    int stride   = frame->linesize[0];
+    uint8_t *dst = frame->data[0] + stride * line;
 
-        if (AV_RL32(src + off) != slice_size - 16) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "Slice sizes mismatch: got %"PRIu32" instead of %"PRIu32"\n",
-                   AV_RL32(src + off), slice_size - 16);
+    for (y = 0; y < left && get_bits_left(gb) > 16; y++) {
+        for (x = 0; x < width; x++) {
+            dst[x * 3 + 0] = decode_sym(gb, lru[0]);
+            dst[x * 3 + 1] = decode_sym(gb, lru[1]);
+            dst[x * 3 + 2] = decode_sym(gb, lru[2]);
         }
-        init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
-        dx2_decode_slice_rgb(&gb2, avctx->width, slice_height, dst,
-                             pic->linesize[0]);
 
-        dst += pic->linesize[0] * slice_height;
-        off += slice_size;
+        dst += stride;
     }
 
-    return 0;
+    return y;
 }
 
-static int dx2_decode_slice_410(GetBitContext *gb, int width, int height,
-                                uint8_t *Y, uint8_t *U, uint8_t *V,
-                                int ystride, int ustride, int vstride)
+static void default_setup_lru(uint8_t lru[3][8])
 {
-    int x, y, i, j;
-    uint8_t lru[3][8];
+    int i;
 
     for (i = 0; i < 3; i++)
         memcpy(lru[i], def_lru, 8 * sizeof(*def_lru));
+}
 
-    for (y = 0; y < height; y += 4) {
+static int dxtory_decode_v2_rgb(AVCodecContext *avctx, AVFrame *pic,
+                                const uint8_t *src, int src_size)
+{
+    return dxtory_decode_v2(avctx, pic, src, src_size,
+                            dx2_decode_slice_rgb,
+                            default_setup_lru,
+                            AV_PIX_FMT_BGR24);
+}
+
+static int dx2_decode_slice_410(GetBitContext *gb, AVFrame *frame,
+                                int line, int left,
+                                uint8_t lru[3][8])
+{
+    int x, y, i, j;
+    int width   = frame->width;
+
+    int ystride = frame->linesize[0];
+    int ustride = frame->linesize[1];
+    int vstride = frame->linesize[2];
+
+    uint8_t *Y  = frame->data[0] + ystride * line;
+    uint8_t *U  = frame->data[1] + (ustride >> 2) * line;
+    uint8_t *V  = frame->data[2] + (vstride >> 2) * line;
+
+    for (y = 0; y < left - 3 && get_bits_left(gb) > 16; y += 4) {
         for (x = 0; x < width; x += 4) {
             for (j = 0; j < 4; j++)
                 for (i = 0; i < 4; i++)
@@ -402,96 +449,37 @@ static int dx2_decode_slice_410(GetBitContext *gb, int width, int height,
         V += vstride;
     }
 
-    return 0;
+    return y;
 }
 
+
 static int dxtory_decode_v2_410(AVCodecContext *avctx, AVFrame *pic,
                                 const uint8_t *src, int src_size)
 {
-    GetByteContext gb;
-    GetBitContext  gb2;
-    int nslices, slice, slice_height, ref_slice_height;
-    int cur_y, next_y;
-    uint32_t off, slice_size;
-    uint8_t *Y, *U, *V;
-    int ret;
-
-    bytestream2_init(&gb, src, src_size);
-    nslices = bytestream2_get_le16(&gb);
-    off = FFALIGN(nslices * 4 + 2, 16);
-    if (src_size < off) {
-        av_log(avctx, AV_LOG_ERROR, "no slice data\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (!nslices || avctx->height % nslices) {
-        avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
-                              avctx->width, avctx->height);
-        return AVERROR_PATCHWELCOME;
-    }
-
-    ref_slice_height = avctx->height / nslices;
-    if ((avctx->width & 3) || (avctx->height & 3)) {
-        avpriv_request_sample(avctx, "Frame dimensions %dx%d",
-                              avctx->width, avctx->height);
-    }
-
-    avctx->pix_fmt = AV_PIX_FMT_YUV410P;
-    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
-        return ret;
-
-    Y = pic->data[0];
-    U = pic->data[1];
-    V = pic->data[2];
+    return dxtory_decode_v2(avctx, pic, src, src_size,
+                            dx2_decode_slice_410,
+                            default_setup_lru,
+                            AV_PIX_FMT_YUV410P);
+}
 
-    cur_y  = 0;
-    next_y = ref_slice_height;
-    for (slice = 0; slice < nslices; slice++) {
-        slice_size   = bytestream2_get_le32(&gb);
-        slice_height = (next_y & ~3) - (cur_y & ~3);
-        if (slice_size > src_size - off) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "invalid slice size %"PRIu32" (only %"PRIu32" bytes left)\n",
-                   slice_size, src_size - off);
-            return AVERROR_INVALIDDATA;
-        }
-        if (slice_size <= 16) {
-            av_log(avctx, AV_LOG_ERROR, "invalid slice size %"PRIu32"\n", slice_size);
-            return AVERROR_INVALIDDATA;
-        }
+static int dx2_decode_slice_420(GetBitContext *gb, AVFrame *frame,
+                                int line, int left,
+                                uint8_t lru[3][8])
+{
+    int x, y;
 
-        if (AV_RL32(src + off) != slice_size - 16) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "Slice sizes mismatch: got %"PRIu32" instead of %"PRIu32"\n",
-                   AV_RL32(src + off), slice_size - 16);
-        }
-        init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
-        dx2_decode_slice_410(&gb2, avctx->width, slice_height, Y, U, V,
-                             pic->linesize[0], pic->linesize[1],
-                             pic->linesize[2]);
+    int width    = frame->width;
 
-        Y += pic->linesize[0] *  slice_height;
-        U += pic->linesize[1] * (slice_height >> 2);
-        V += pic->linesize[2] * (slice_height >> 2);
-        off += slice_size;
-        cur_y   = next_y;
-        next_y += ref_slice_height;
-    }
+    int ystride = frame->linesize[0];
+    int ustride = frame->linesize[1];
+    int vstride = frame->linesize[2];
 
-    return 0;
-}
+    uint8_t *Y  = frame->data[0] + ystride * line;
+    uint8_t *U  = frame->data[1] + (ustride >> 1) * line;
+    uint8_t *V  = frame->data[2] + (vstride >> 1) * line;
 
-static int dx2_decode_slice_420(GetBitContext *gb, int width, int height,
-                                uint8_t *Y, uint8_t *U, uint8_t *V,
-                                int ystride, int ustride, int vstride)
-{
-    int x, y, i;
-    uint8_t lru[3][8];
 
-    for (i = 0; i < 3; i++)
-        memcpy(lru[i], def_lru, 8 * sizeof(*def_lru));
-
-    for (y = 0; y < height; y+=2) {
+    for (y = 0; y < left - 1 && get_bits_left(gb) > 16; y += 2) {
         for (x = 0; x < width; x += 2) {
             Y[x + 0 + 0 * ystride] = decode_sym(gb, lru[0]);
             Y[x + 1 + 0 * ystride] = decode_sym(gb, lru[0]);
@@ -506,96 +494,35 @@ static int dx2_decode_slice_420(GetBitContext *gb, int width, int height,
         V += vstride;
     }
 
-    return 0;
+    return y;
 }
 
 static int dxtory_decode_v2_420(AVCodecContext *avctx, AVFrame *pic,
                                 const uint8_t *src, int src_size)
 {
-    GetByteContext gb;
-    GetBitContext  gb2;
-    int nslices, slice, slice_height, ref_slice_height;
-    int cur_y, next_y;
-    uint32_t off, slice_size;
-    uint8_t *Y, *U, *V;
-    int ret;
-
-    bytestream2_init(&gb, src, src_size);
-    nslices = bytestream2_get_le16(&gb);
-    off = FFALIGN(nslices * 4 + 2, 16);
-    if (src_size < off) {
-        av_log(avctx, AV_LOG_ERROR, "no slice data\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (!nslices || avctx->height % nslices) {
-        avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
-                              avctx->width, avctx->height);
-        return AVERROR_PATCHWELCOME;
-    }
-
-    ref_slice_height = avctx->height / nslices;
-    if ((avctx->width & 1) || (avctx->height & 1)) {
-        avpriv_request_sample(avctx, "Frame dimensions %dx%d",
-                              avctx->width, avctx->height);
-    }
-
-    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
-    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
-        return ret;
-
-    Y = pic->data[0];
-    U = pic->data[1];
-    V = pic->data[2];
-
-    cur_y  = 0;
-    next_y = ref_slice_height;
-    for (slice = 0; slice < nslices; slice++) {
-        slice_size   = bytestream2_get_le32(&gb);
-        slice_height = (next_y & ~1) - (cur_y & ~1);
-        if (slice_size > src_size - off) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "invalid slice size %"PRIu32" (only %"PRIu32" bytes left)\n",
-                   slice_size, src_size - off);
-            return AVERROR_INVALIDDATA;
-        }
-        if (slice_size <= 16) {
-            av_log(avctx, AV_LOG_ERROR, "invalid slice size %"PRIu32"\n", slice_size);
-            return AVERROR_INVALIDDATA;
-        }
-
-        if (AV_RL32(src + off) != slice_size - 16) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "Slice sizes mismatch: got %"PRIu32" instead of %"PRIu32"\n",
-                   AV_RL32(src + off), slice_size - 16);
-        }
-        init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
-        dx2_decode_slice_420(&gb2, avctx->width, slice_height, Y, U, V,
-                             pic->linesize[0], pic->linesize[1],
-                             pic->linesize[2]);
-
-        Y += pic->linesize[0] *  slice_height;
-        U += pic->linesize[1] * (slice_height >> 1);
-        V += pic->linesize[2] * (slice_height >> 1);
-        off += slice_size;
-        cur_y   = next_y;
-        next_y += ref_slice_height;
-    }
-
-    return 0;
+    return dxtory_decode_v2(avctx, pic, src, src_size,
+                            dx2_decode_slice_420,
+                            default_setup_lru,
+                            AV_PIX_FMT_YUV420P);
 }
 
-static int dx2_decode_slice_444(GetBitContext *gb, int width, int height,
-                                uint8_t *Y, uint8_t *U, uint8_t *V,
-                                int ystride, int ustride, int vstride)
+static int dx2_decode_slice_444(GetBitContext *gb, AVFrame *frame,
+                                int line, int left,
+                                uint8_t lru[3][8])
 {
-    int x, y, i;
-    uint8_t lru[3][8];
+    int x, y;
 
-    for (i = 0; i < 3; i++)
-        memcpy(lru[i], def_lru, 8 * sizeof(*def_lru));
+    int width   = frame->width;
+
+    int ystride = frame->linesize[0];
+    int ustride = frame->linesize[1];
+    int vstride = frame->linesize[2];
+
+    uint8_t *Y  = frame->data[0] + ystride * line;
+    uint8_t *U  = frame->data[1] + ustride * line;
+    uint8_t *V  = frame->data[2] + vstride * line;
 
-    for (y = 0; y < height; y++) {
+    for (y = 0; y < left && get_bits_left(gb) > 16; y++) {
         for (x = 0; x < width; x++) {
             Y[x] = decode_sym(gb, lru[0]);
             U[x] = decode_sym(gb, lru[1]) ^ 0x80;
@@ -607,73 +534,16 @@ static int dx2_decode_slice_444(GetBitContext *gb, int width, int height,
         V += vstride;
     }
 
-    return 0;
+    return y;
 }
 
 static int dxtory_decode_v2_444(AVCodecContext *avctx, AVFrame *pic,
                                 const uint8_t *src, int src_size)
 {
-    GetByteContext gb;
-    GetBitContext  gb2;
-    int nslices, slice, slice_height;
-    uint32_t off, slice_size;
-    uint8_t *Y, *U, *V;
-    int ret;
-
-    bytestream2_init(&gb, src, src_size);
-    nslices = bytestream2_get_le16(&gb);
-    off = FFALIGN(nslices * 4 + 2, 16);
-    if (src_size < off) {
-        av_log(avctx, AV_LOG_ERROR, "no slice data\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (!nslices || avctx->height % nslices) {
-        avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
-                              avctx->width, avctx->height);
-        return AVERROR_PATCHWELCOME;
-    }
-
-    slice_height = avctx->height / nslices;
-
-    avctx->pix_fmt = AV_PIX_FMT_YUV444P;
-    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
-        return ret;
-
-    Y = pic->data[0];
-    U = pic->data[1];
-    V = pic->data[2];
-
-    for (slice = 0; slice < nslices; slice++) {
-        slice_size = bytestream2_get_le32(&gb);
-        if (slice_size > src_size - off) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "invalid slice size %"PRIu32" (only %"PRIu32" bytes left)\n",
-                   slice_size, src_size - off);
-            return AVERROR_INVALIDDATA;
-        }
-        if (slice_size <= 16) {
-            av_log(avctx, AV_LOG_ERROR, "invalid slice size %"PRIu32"\n", slice_size);
-            return AVERROR_INVALIDDATA;
-        }
-
-        if (AV_RL32(src + off) != slice_size - 16) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "Slice sizes mismatch: got %"PRIu32" instead of %"PRIu32"\n",
-                   AV_RL32(src + off), slice_size - 16);
-        }
-        init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
-        dx2_decode_slice_444(&gb2, avctx->width, slice_height, Y, U, V,
-                             pic->linesize[0], pic->linesize[1],
-                             pic->linesize[2]);
-
-        Y += pic->linesize[0] * slice_height;
-        U += pic->linesize[1] * slice_height;
-        V += pic->linesize[2] * slice_height;
-        off += slice_size;
-    }
-
-    return 0;
+    return dxtory_decode_v2(avctx, pic, src, src_size,
+                            dx2_decode_slice_444,
+                            default_setup_lru,
+                            AV_PIX_FMT_YUV444P);
 }
 
 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,