making act segmenter

1 files changed, 444 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/xxan.c b/ffmpeg/libavcodec/xxan.c
new file mode 100644
index 0000000..e2b1b8c
--- /dev/null
+++ b/ffmpeg/libavcodec/xxan.c
@@ -0,0 +1,444 @@
+/*
+ * Wing Commander/Xan Video Decoder
+ * Copyright (C) 2011 Konstantin Shishkov
+ * based on work by Mike Melanson
+ *
+ * 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
+ */
+
+#include "avcodec.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
+#include "bytestream.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "internal.h"
+
+typedef struct XanContext {
+    AVCodecContext *avctx;
+    AVFrame pic;
+
+    uint8_t *y_buffer;
+    uint8_t *scratch_buffer;
+    int     buffer_size;
+    GetByteContext gb;
+} XanContext;
+
+static av_cold int xan_decode_init(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+
+    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+
+    if (avctx->height < 8) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid frame height: %d.\n", avctx->height);
+        return AVERROR(EINVAL);
+    }
+
+    s->buffer_size = avctx->width * avctx->height;
+    s->y_buffer = av_malloc(s->buffer_size);
+    if (!s->y_buffer)
+        return AVERROR(ENOMEM);
+    s->scratch_buffer = av_malloc(s->buffer_size + 130);
+    if (!s->scratch_buffer) {
+        av_freep(&s->y_buffer);
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int xan_unpack_luma(XanContext *s,
+                           uint8_t *dst, const int dst_size)
+{
+    int tree_size, eof;
+    int bits, mask;
+    int tree_root, node;
+    const uint8_t *dst_end = dst + dst_size;
+    GetByteContext tree = s->gb;
+    int start_off = bytestream2_tell(&tree);
+
+    tree_size = bytestream2_get_byte(&s->gb);
+    eof       = bytestream2_get_byte(&s->gb);
+    tree_root = eof + tree_size;
+    bytestream2_skip(&s->gb, tree_size * 2);
+
+    node = tree_root;
+    bits = bytestream2_get_byte(&s->gb);
+    mask = 0x80;
+    for (;;) {
+        int bit = !!(bits & mask);
+        mask >>= 1;
+        bytestream2_seek(&tree, start_off + node*2 + bit - eof * 2, SEEK_SET);
+        node = bytestream2_get_byte(&tree);
+        if (node == eof)
+            break;
+        if (node < eof) {
+            *dst++ = node;
+            if (dst > dst_end)
+                break;
+            node = tree_root;
+        }
+        if (!mask) {
+            if (bytestream2_get_bytes_left(&s->gb) <= 0)
+                break;
+            bits = bytestream2_get_byteu(&s->gb);
+            mask = 0x80;
+        }
+    }
+    return dst != dst_end ? AVERROR_INVALIDDATA : 0;
+}
+
+/* almost the same as in xan_wc3 decoder */
+static int xan_unpack(XanContext *s,
+                      uint8_t *dest, const int dest_len)
+{
+    uint8_t opcode;
+    int size;
+    uint8_t *orig_dest = dest;
+    const uint8_t *dest_end = dest + dest_len;
+
+    while (dest < dest_end) {
+        if (bytestream2_get_bytes_left(&s->gb) <= 0)
+            return AVERROR_INVALIDDATA;
+
+        opcode = bytestream2_get_byteu(&s->gb);
+
+        if (opcode < 0xe0) {
+            int size2, back;
+            if ((opcode & 0x80) == 0) {
+                size  = opcode & 3;
+                back  = ((opcode & 0x60) << 3) + bytestream2_get_byte(&s->gb) + 1;
+                size2 = ((opcode & 0x1c) >> 2) + 3;
+            } else if ((opcode & 0x40) == 0) {
+                size  = bytestream2_peek_byte(&s->gb) >> 6;
+                back  = (bytestream2_get_be16(&s->gb) & 0x3fff) + 1;
+                size2 = (opcode & 0x3f) + 4;
+            } else {
+                size  = opcode & 3;
+                back  = ((opcode & 0x10) << 12) + bytestream2_get_be16(&s->gb) + 1;
+                size2 = ((opcode & 0x0c) <<  6) + bytestream2_get_byte(&s->gb) + 5;
+                if (size + size2 > dest_end - dest)
+                    break;
+            }
+            if (dest + size + size2 > dest_end ||
+                dest - orig_dest + size < back)
+                return AVERROR_INVALIDDATA;
+            bytestream2_get_buffer(&s->gb, dest, size);
+            dest += size;
+            av_memcpy_backptr(dest, back, size2);
+            dest += size2;
+        } else {
+            int finish = opcode >= 0xfc;
+
+            size = finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4;
+            if (dest_end - dest < size)
+                return AVERROR_INVALIDDATA;
+            bytestream2_get_buffer(&s->gb, dest, size);
+            dest += size;
+            if (finish)
+                break;
+        }
+    }
+    return dest - orig_dest;
+}
+
+static int xan_decode_chroma(AVCodecContext *avctx, unsigned chroma_off)
+{
+    XanContext *s = avctx->priv_data;
+    uint8_t *U, *V;
+    int val, uval, vval;
+    int i, j;
+    const uint8_t *src, *src_end;
+    const uint8_t *table;
+    int mode, offset, dec_size, table_size;
+
+    if (!chroma_off)
+        return 0;
+    if (chroma_off + 4 >= bytestream2_get_bytes_left(&s->gb)) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid chroma block position\n");
+        return AVERROR_INVALIDDATA;
+    }
+    bytestream2_seek(&s->gb, chroma_off + 4, SEEK_SET);
+    mode        = bytestream2_get_le16(&s->gb);
+    table       = s->gb.buffer;
+    table_size  = bytestream2_get_le16(&s->gb);
+    offset      = table_size * 2;
+    table_size += 1;
+
+    if (offset >= bytestream2_get_bytes_left(&s->gb)) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid chroma block offset\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    bytestream2_skip(&s->gb, offset);
+    memset(s->scratch_buffer, 0, s->buffer_size);
+    dec_size = xan_unpack(s, s->scratch_buffer, s->buffer_size);
+    if (dec_size < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Chroma unpacking failed\n");
+        return dec_size;
+    }
+
+    U = s->pic.data[1];
+    V = s->pic.data[2];
+    src     = s->scratch_buffer;
+    src_end = src + dec_size;
+    if (mode) {
+        for (j = 0; j < avctx->height >> 1; j++) {
+            for (i = 0; i < avctx->width >> 1; i++) {
+                if (src_end - src < 1)
+                    return 0;
+                val = *src++;
+                if (val) {
+                    if (val >= table_size)
+                        return AVERROR_INVALIDDATA;
+                    val  = AV_RL16(table + (val << 1));
+                    uval = (val >> 3) & 0xF8;
+                    vval = (val >> 8) & 0xF8;
+                    U[i] = uval | (uval >> 5);
+                    V[i] = vval | (vval >> 5);
+                }
+            }
+            U += s->pic.linesize[1];
+            V += s->pic.linesize[2];
+        }
+        if (avctx->height & 1) {
+            memcpy(U, U - s->pic.linesize[1], avctx->width >> 1);
+            memcpy(V, V - s->pic.linesize[2], avctx->width >> 1);
+        }
+    } else {
+        uint8_t *U2 = U + s->pic.linesize[1];
+        uint8_t *V2 = V + s->pic.linesize[2];
+
+        for (j = 0; j < avctx->height >> 2; j++) {
+            for (i = 0; i < avctx->width >> 1; i += 2) {
+                if (src_end - src < 1)
+                    return 0;
+                val = *src++;
+                if (val) {
+                    if (val >= table_size)
+                        return AVERROR_INVALIDDATA;
+                    val  = AV_RL16(table + (val << 1));
+                    uval = (val >> 3) & 0xF8;
+                    vval = (val >> 8) & 0xF8;
+                    U[i] = U[i+1] = U2[i] = U2[i+1] = uval | (uval >> 5);
+                    V[i] = V[i+1] = V2[i] = V2[i+1] = vval | (vval >> 5);
+                }
+            }
+            U  += s->pic.linesize[1] * 2;
+            V  += s->pic.linesize[2] * 2;
+            U2 += s->pic.linesize[1] * 2;
+            V2 += s->pic.linesize[2] * 2;
+        }
+        if (avctx->height & 3) {
+            int lines = ((avctx->height + 1) >> 1) - (avctx->height >> 2) * 2;
+
+            memcpy(U, U - lines * s->pic.linesize[1], lines * s->pic.linesize[1]);
+            memcpy(V, V - lines * s->pic.linesize[2], lines * s->pic.linesize[2]);
+        }
+    }
+
+    return 0;
+}
+
+static int xan_decode_frame_type0(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+    uint8_t *ybuf, *prev_buf, *src = s->scratch_buffer;
+    unsigned  chroma_off, corr_off;
+    int cur, last;
+    int i, j;
+    int ret;
+
+    chroma_off = bytestream2_get_le32(&s->gb);
+    corr_off   = bytestream2_get_le32(&s->gb);
+
+    if ((ret = xan_decode_chroma(avctx, chroma_off)) != 0)
+        return ret;
+
+    if (corr_off >= bytestream2_size(&s->gb)) {
+        av_log(avctx, AV_LOG_WARNING, "Ignoring invalid correction block position\n");
+        corr_off = 0;
+    }
+    bytestream2_seek(&s->gb, 12, SEEK_SET);
+    ret = xan_unpack_luma(s, src, s->buffer_size >> 1);
+    if (ret) {
+        av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n");
+        return ret;
+    }
+
+    ybuf = s->y_buffer;
+    last = *src++;
+    ybuf[0] = last << 1;
+    for (j = 1; j < avctx->width - 1; j += 2) {
+        cur = (last + *src++) & 0x1F;
+        ybuf[j]   = last + cur;
+        ybuf[j+1] = cur << 1;
+        last = cur;
+    }
+    if(j < avctx->width)
+        ybuf[j]  = last << 1;
+    prev_buf = ybuf;
+    ybuf += avctx->width;
+
+    for (i = 1; i < avctx->height; i++) {
+        last = ((prev_buf[0] >> 1) + *src++) & 0x1F;
+        ybuf[0] = last << 1;
+        for (j = 1; j < avctx->width - 1; j += 2) {
+            cur = ((prev_buf[j + 1] >> 1) + *src++) & 0x1F;
+            ybuf[j]   = last + cur;
+            ybuf[j+1] = cur << 1;
+            last = cur;
+        }
+        if(j < avctx->width)
+            ybuf[j] = last << 1;
+        prev_buf = ybuf;
+        ybuf += avctx->width;
+    }
+
+    if (corr_off) {
+        int dec_size;
+
+        bytestream2_seek(&s->gb, 8 + corr_off, SEEK_SET);
+        dec_size = xan_unpack(s, s->scratch_buffer, s->buffer_size / 2);
+        if (dec_size < 0)
+            dec_size = 0;
+        else
+            dec_size = FFMIN(dec_size, s->buffer_size/2 - 1);
+
+        for (i = 0; i < dec_size; i++)
+            s->y_buffer[i*2+1] = (s->y_buffer[i*2+1] + (s->scratch_buffer[i] << 1)) & 0x3F;
+    }
+
+    src  = s->y_buffer;
+    ybuf = s->pic.data[0];
+    for (j = 0; j < avctx->height; j++) {
+        for (i = 0; i < avctx->width; i++)
+            ybuf[i] = (src[i] << 2) | (src[i] >> 3);
+        src  += avctx->width;
+        ybuf += s->pic.linesize[0];
+    }
+
+    return 0;
+}
+
+static int xan_decode_frame_type1(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+    uint8_t *ybuf, *src = s->scratch_buffer;
+    int cur, last;
+    int i, j;
+    int ret;
+
+    if ((ret = xan_decode_chroma(avctx, bytestream2_get_le32(&s->gb))) != 0)
+        return ret;
+
+    bytestream2_seek(&s->gb, 16, SEEK_SET);
+    ret = xan_unpack_luma(s, src,
+                          s->buffer_size >> 1);
+    if (ret) {
+        av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n");
+        return ret;
+    }
+
+    ybuf = s->y_buffer;
+    for (i = 0; i < avctx->height; i++) {
+        last = (ybuf[0] + (*src++ << 1)) & 0x3F;
+        ybuf[0] = last;
+        for (j = 1; j < avctx->width - 1; j += 2) {
+            cur = (ybuf[j + 1] + (*src++ << 1)) & 0x3F;
+            ybuf[j]   = (last + cur) >> 1;
+            ybuf[j+1] = cur;
+            last = cur;
+        }
+        if(j < avctx->width)
+            ybuf[j] = last;
+        ybuf += avctx->width;
+    }
+
+    src = s->y_buffer;
+    ybuf = s->pic.data[0];
+    for (j = 0; j < avctx->height; j++) {
+        for (i = 0; i < avctx->width; i++)
+            ybuf[i] = (src[i] << 2) | (src[i] >> 3);
+        src  += avctx->width;
+        ybuf += s->pic.linesize[0];
+    }
+
+    return 0;
+}
+
+static int xan_decode_frame(AVCodecContext *avctx,
+                            void *data, int *got_frame,
+                            AVPacket *avpkt)
+{
+    XanContext *s = avctx->priv_data;
+    int ftype;
+    int ret;
+
+    if ((ret = ff_reget_buffer(avctx, &s->pic)) < 0)
+        return ret;
+
+    bytestream2_init(&s->gb, avpkt->data, avpkt->size);
+    ftype = bytestream2_get_le32(&s->gb);
+    switch (ftype) {
+    case 0:
+        ret = xan_decode_frame_type0(avctx);
+        break;
+    case 1:
+        ret = xan_decode_frame_type1(avctx);
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown frame type %d\n", ftype);
+        return AVERROR_INVALIDDATA;
+    }
+    if (ret)
+        return ret;
+
+    if ((ret = av_frame_ref(data, &s->pic)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+static av_cold int xan_decode_end(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+
+    av_frame_unref(&s->pic);
+
+    av_freep(&s->y_buffer);
+    av_freep(&s->scratch_buffer);
+
+    return 0;
+}
+
+AVCodec ff_xan_wc4_decoder = {
+    .name           = "xan_wc4",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_XAN_WC4,
+    .priv_data_size = sizeof(XanContext),
+    .init           = xan_decode_init,
+    .close          = xan_decode_end,
+    .decode         = xan_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Wing Commander IV / Xxan"),
+};