ffmpeg-2.1.1: move directory

git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/wnv1.c

@@ -0,0 +1,156 @@
+/*
+ * Winnov WNV1 codec
+ * Copyright (c) 2005 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
+ * Winnov WNV1 codec.
+ */
+
+#include "avcodec.h"
+#include "get_bits.h"
+#include "internal.h"
+#include "mathops.h"
+
+
+typedef struct WNV1Context {
+    int shift;
+    GetBitContext gb;
+} WNV1Context;
+
+static const uint16_t code_tab[16][2] = {
+    { 0x1FD, 9 }, { 0xFD, 8 }, { 0x7D, 7 }, { 0x3D, 6 }, { 0x1D, 5 }, { 0x0D, 4 }, { 0x005, 3 },
+    { 0x000, 1 },
+    { 0x004, 3 }, { 0x0C, 4 }, { 0x1C, 5 }, { 0x3C, 6 }, { 0x7C, 7 }, { 0xFC, 8 }, { 0x1FC, 9 }, { 0xFF, 8 }
+};
+
+#define CODE_VLC_BITS 9
+static VLC code_vlc;
+
+/* returns modified base_value */
+static inline int wnv1_get_code(WNV1Context *w, int base_value)
+{
+    int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1);
+
+    if (v == 15)
+        return ff_reverse[get_bits(&w->gb, 8 - w->shift)];
+    else
+        return base_value + ((v - 7) << w->shift);
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    WNV1Context * const l = avctx->priv_data;
+    const uint8_t *buf    = avpkt->data;
+    int buf_size          = avpkt->size;
+    AVFrame * const p     = data;
+    unsigned char *Y,*U,*V;
+    int i, j, ret;
+    int prev_y = 0, prev_u = 0, prev_v = 0;
+    uint8_t *rbuf;
+
+    if (buf_size <= 8) {
+        av_log(avctx, AV_LOG_ERROR, "Packet size %d is too small\n", buf_size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    rbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!rbuf) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
+        return AVERROR(ENOMEM);
+    }
+
+    if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
+        av_free(rbuf);
+        return ret;
+    }
+    p->key_frame = 1;
+
+    for (i = 8; i < buf_size; i++)
+        rbuf[i] = ff_reverse[buf[i]];
+    init_get_bits(&l->gb, rbuf + 8, (buf_size - 8) * 8);
+
+    if (buf[2] >> 4 == 6)
+        l->shift = 2;
+    else {
+        l->shift = 8 - (buf[2] >> 4);
+        if (l->shift > 4) {
+            avpriv_request_sample(avctx,
+                                  "Unknown WNV1 frame header value %i",
+                                  buf[2] >> 4);
+            l->shift = 4;
+        }
+        if (l->shift < 1) {
+            avpriv_request_sample(avctx,
+                                  "Unknown WNV1 frame header value %i",
+                                  buf[2] >> 4);
+            l->shift = 1;
+        }
+    }
+
+    Y = p->data[0];
+    U = p->data[1];
+    V = p->data[2];
+    for (j = 0; j < avctx->height; j++) {
+        for (i = 0; i < avctx->width / 2; i++) {
+            Y[i * 2] = wnv1_get_code(l, prev_y);
+            prev_u = U[i] = wnv1_get_code(l, prev_u);
+            prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]);
+            prev_v = V[i] = wnv1_get_code(l, prev_v);
+        }
+        Y += p->linesize[0];
+        U += p->linesize[1];
+        V += p->linesize[2];
+    }
+
+
+    *got_frame      = 1;
+    av_free(rbuf);
+
+    return buf_size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
+
+    avctx->pix_fmt = AV_PIX_FMT_YUV422P;
+
+    code_vlc.table           = code_table;
+    code_vlc.table_allocated = 1 << CODE_VLC_BITS;
+    init_vlc(&code_vlc, CODE_VLC_BITS, 16,
+             &code_tab[0][1], 4, 2,
+             &code_tab[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
+
+    return 0;
+}
+
+AVCodec ff_wnv1_decoder = {
+    .name           = "wnv1",
+    .long_name      = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_WNV1,
+    .priv_data_size = sizeof(WNV1Context),
+    .init           = decode_init,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};