dxtory v2 support

1 files changed, 156 insertions, 22 deletions

diff --git a/libavcodec/dxtory.c b/libavcodec/dxtory.c
index 28e66ba3f9..6018ebb206 100644
--- a/libavcodec/dxtory.c
+++ b/libavcodec/dxtory.c
@@ -20,44 +20,31 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#define BITSTREAM_READER_LE
 #include "avcodec.h"
+#include "bytestream.h"
+#include "get_bits.h"
 #include "internal.h"
+#include "unary.h"
 #include "libavutil/common.h"
 #include "libavutil/intreadwrite.h"
 
-static av_cold int decode_init(AVCodecContext *avctx)
-{
-    avctx->pix_fmt     = AV_PIX_FMT_YUV420P;
-
-    return 0;
-}
-
-static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
-                        AVPacket *avpkt)
+static int dxtory_decode_v1(AVCodecContext *avctx, AVFrame *pic,
+                            const uint8_t *src, int src_size)
 {
     int h, w;
-    AVFrame *pic = data;
-    const uint8_t *src = avpkt->data;
     uint8_t *Y1, *Y2, *U, *V;
     int ret;
 
-    if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) {
+    if (src_size < avctx->width * avctx->height * 3 / 2) {
         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
         return AVERROR_INVALIDDATA;
     }
 
+    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
         return ret;
 
-    pic->pict_type = AV_PICTURE_TYPE_I;
-    pic->key_frame = 1;
-
-    if (AV_RL32(src) != 0x01000002) {
-        avpriv_request_sample(avctx, "Frame header %X", AV_RL32(src));
-        return AVERROR_PATCHWELCOME;
-    }
-    src += 16;
-
     Y1 = pic->data[0];
     Y2 = pic->data[0] + pic->linesize[0];
     U  = pic->data[1];
@@ -76,6 +63,154 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
         V  += pic->linesize[2];
     }
 
+    return 0;
+}
+
+const uint8_t def_lru[8] = { 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0, 0xFF };
+
+static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
+{
+    uint8_t c, val;
+
+    c = get_unary(gb, 0, 8);
+    if (!c) {
+        val = get_bits(gb, 8);
+        memmove(lru + 1, lru, sizeof(*lru) * (8 - 1));
+    } else {
+        val = lru[c - 1];
+        memmove(lru + 1, lru, sizeof(*lru) * (c - 1));
+    }
+    lru[0] = val;
+
+    return val;
+}
+
+static int dx2_decode_slice(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 (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]);
+            Y[x + 0 + 1 * ystride] = decode_sym(gb, lru[0]);
+            Y[x + 1 + 1 * ystride] = decode_sym(gb, lru[0]);
+            U[x >> 1] = decode_sym(gb, lru[1]) ^ 0x80;
+            V[x >> 1] = decode_sym(gb, lru[2]) ^ 0x80;
+        }
+
+        Y += ystride << 1;
+        U += ustride;
+        V += vstride;
+    }
+
+    return 0;
+}
+
+static int dxtory_decode_v2(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(ENOSYS);
+    }
+
+    slice_height = avctx->height / nslices;
+    if ((avctx->width & 1) || (slice_height & 1)) {
+        avpriv_request_sample(avctx, "slice dimensions %dx%d",
+                              avctx->width, slice_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];
+
+    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 %d (only %d bytes left)\n",
+                   slice_size, src_size - off);
+            return AVERROR_INVALIDDATA;
+        }
+        if (slice_size <= 16) {
+            av_log(avctx, AV_LOG_ERROR, "invalid slice size %d\n", slice_size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (AV_RL32(src + off) != slice_size - 16) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Slice sizes mismatch: got %d instead of %d\n",
+                   AV_RL32(src + off), slice_size - 16);
+        }
+        init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
+        dx2_decode_slice(&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;
+    }
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    AVFrame *pic = data;
+    const uint8_t *src = avpkt->data;
+    int ret;
+
+    if (avpkt->size < 16) {
+        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    switch (AV_RB32(src)) {
+    case 0x02000001:
+        ret = dxtory_decode_v1(avctx, pic, src + 16, avpkt->size - 16);
+        break;
+    case 0x02000009:
+        ret = dxtory_decode_v2(avctx, pic, src + 16, avpkt->size - 16);
+        break;
+    default:
+        avpriv_request_sample(avctx, "Frame header %X", AV_RB32(src));
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (ret)
+        return ret;
+
+    pic->pict_type = AV_PICTURE_TYPE_I;
+    pic->key_frame = 1;
     *got_frame = 1;
 
     return avpkt->size;
@@ -86,7 +221,6 @@ AVCodec ff_dxtory_decoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("Dxtory"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_DXTORY,
-    .init           = decode_init,
     .decode         = decode_frame,
     .capabilities   = CODEC_CAP_DR1,
 };