making act segmenter

1 files changed, 442 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/kmvc.c b/ffmpeg/libavcodec/kmvc.c
new file mode 100644
index 0000000..20aae67
--- /dev/null
+++ b/ffmpeg/libavcodec/kmvc.c
@@ -0,0 +1,442 @@
+/*
+ * KMVC decoder
+ * Copyright (c) 2006 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
+ * Karl Morton's Video Codec decoder
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+#define KMVC_KEYFRAME 0x80
+#define KMVC_PALETTE  0x40
+#define KMVC_METHOD   0x0F
+#define MAX_PALSIZE   256
+
+/*
+ * Decoder context
+ */
+typedef struct KmvcContext {
+    AVCodecContext *avctx;
+
+    int setpal;
+    int palsize;
+    uint32_t pal[MAX_PALSIZE];
+    uint8_t *cur, *prev;
+    uint8_t *frm0, *frm1;
+    GetByteContext g;
+} KmvcContext;
+
+typedef struct BitBuf {
+    int bits;
+    int bitbuf;
+} BitBuf;
+
+#define BLK(data, x, y)  data[(x) + (y) * 320]
+
+#define kmvc_init_getbits(bb, g)  bb.bits = 7; bb.bitbuf = bytestream2_get_byte(g);
+
+#define kmvc_getbit(bb, g, res) {\
+    res = 0; \
+    if (bb.bitbuf & (1 << bb.bits)) res = 1; \
+    bb.bits--; \
+    if(bb.bits == -1) { \
+        bb.bitbuf = bytestream2_get_byte(g); \
+        bb.bits = 7; \
+    } \
+}
+
+static int kmvc_decode_intra_8x8(KmvcContext * ctx, int w, int h)
+{
+    BitBuf bb;
+    int res, val;
+    int i, j;
+    int bx, by;
+    int l0x, l1x, l0y, l1y;
+    int mx, my;
+
+    kmvc_init_getbits(bb, &ctx->g);
+
+    for (by = 0; by < h; by += 8)
+        for (bx = 0; bx < w; bx += 8) {
+            if (!bytestream2_get_bytes_left(&ctx->g)) {
+                av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
+                return AVERROR_INVALIDDATA;
+            }
+            kmvc_getbit(bb, &ctx->g, res);
+            if (!res) {         // fill whole 8x8 block
+                val = bytestream2_get_byte(&ctx->g);
+                for (i = 0; i < 64; i++)
+                    BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
+            } else {            // handle four 4x4 subblocks
+                for (i = 0; i < 4; i++) {
+                    l0x = bx + (i & 1) * 4;
+                    l0y = by + (i & 2) * 2;
+                    kmvc_getbit(bb, &ctx->g, res);
+                    if (!res) {
+                        kmvc_getbit(bb, &ctx->g, res);
+                        if (!res) {     // fill whole 4x4 block
+                            val = bytestream2_get_byte(&ctx->g);
+                            for (j = 0; j < 16; j++)
+                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
+                        } else {        // copy block from already decoded place
+                            val = bytestream2_get_byte(&ctx->g);
+                            mx = val & 0xF;
+                            my = val >> 4;
+                            if ((l0x-mx) + 320*(l0y-my) < 0 || (l0x-mx) + 320*(l0y-my) > 316*196) {
+                                av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+                                return AVERROR_INVALIDDATA;
+                            }
+                            for (j = 0; j < 16; j++)
+                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
+                                    BLK(ctx->cur, l0x + (j & 3) - mx, l0y + (j >> 2) - my);
+                        }
+                    } else {    // descend to 2x2 sub-sub-blocks
+                        for (j = 0; j < 4; j++) {
+                            l1x = l0x + (j & 1) * 2;
+                            l1y = l0y + (j & 2);
+                            kmvc_getbit(bb, &ctx->g, res);
+                            if (!res) {
+                                kmvc_getbit(bb, &ctx->g, res);
+                                if (!res) {     // fill whole 2x2 block
+                                    val = bytestream2_get_byte(&ctx->g);
+                                    BLK(ctx->cur, l1x, l1y) = val;
+                                    BLK(ctx->cur, l1x + 1, l1y) = val;
+                                    BLK(ctx->cur, l1x, l1y + 1) = val;
+                                    BLK(ctx->cur, l1x + 1, l1y + 1) = val;
+                                } else {        // copy block from already decoded place
+                                    val = bytestream2_get_byte(&ctx->g);
+                                    mx = val & 0xF;
+                                    my = val >> 4;
+                                    if ((l1x-mx) + 320*(l1y-my) < 0 || (l1x-mx) + 320*(l1y-my) > 318*198) {
+                                        av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+                                        return AVERROR_INVALIDDATA;
+                                    }
+                                    BLK(ctx->cur, l1x, l1y) = BLK(ctx->cur, l1x - mx, l1y - my);
+                                    BLK(ctx->cur, l1x + 1, l1y) =
+                                        BLK(ctx->cur, l1x + 1 - mx, l1y - my);
+                                    BLK(ctx->cur, l1x, l1y + 1) =
+                                        BLK(ctx->cur, l1x - mx, l1y + 1 - my);
+                                    BLK(ctx->cur, l1x + 1, l1y + 1) =
+                                        BLK(ctx->cur, l1x + 1 - mx, l1y + 1 - my);
+                                }
+                            } else {    // read values for block
+                                BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
+                                BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
+                                BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
+                                BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+    return 0;
+}
+
+static int kmvc_decode_inter_8x8(KmvcContext * ctx, int w, int h)
+{
+    BitBuf bb;
+    int res, val;
+    int i, j;
+    int bx, by;
+    int l0x, l1x, l0y, l1y;
+    int mx, my;
+
+    kmvc_init_getbits(bb, &ctx->g);
+
+    for (by = 0; by < h; by += 8)
+        for (bx = 0; bx < w; bx += 8) {
+            kmvc_getbit(bb, &ctx->g, res);
+            if (!res) {
+                kmvc_getbit(bb, &ctx->g, res);
+                if (!res) {     // fill whole 8x8 block
+                    if (!bytestream2_get_bytes_left(&ctx->g)) {
+                        av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
+                        return AVERROR_INVALIDDATA;
+                    }
+                    val = bytestream2_get_byte(&ctx->g);
+                    for (i = 0; i < 64; i++)
+                        BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
+                } else {        // copy block from previous frame
+                    for (i = 0; i < 64; i++)
+                        BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) =
+                            BLK(ctx->prev, bx + (i & 0x7), by + (i >> 3));
+                }
+            } else {            // handle four 4x4 subblocks
+                if (!bytestream2_get_bytes_left(&ctx->g)) {
+                    av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
+                    return AVERROR_INVALIDDATA;
+                }
+                for (i = 0; i < 4; i++) {
+                    l0x = bx + (i & 1) * 4;
+                    l0y = by + (i & 2) * 2;
+                    kmvc_getbit(bb, &ctx->g, res);
+                    if (!res) {
+                        kmvc_getbit(bb, &ctx->g, res);
+                        if (!res) {     // fill whole 4x4 block
+                            val = bytestream2_get_byte(&ctx->g);
+                            for (j = 0; j < 16; j++)
+                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
+                        } else {        // copy block
+                            val = bytestream2_get_byte(&ctx->g);
+                            mx = (val & 0xF) - 8;
+                            my = (val >> 4) - 8;
+                            if ((l0x+mx) + 320*(l0y+my) < 0 || (l0x+mx) + 320*(l0y+my) > 318*198) {
+                                av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+                                return AVERROR_INVALIDDATA;
+                            }
+                            for (j = 0; j < 16; j++)
+                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
+                                    BLK(ctx->prev, l0x + (j & 3) + mx, l0y + (j >> 2) + my);
+                        }
+                    } else {    // descend to 2x2 sub-sub-blocks
+                        for (j = 0; j < 4; j++) {
+                            l1x = l0x + (j & 1) * 2;
+                            l1y = l0y + (j & 2);
+                            kmvc_getbit(bb, &ctx->g, res);
+                            if (!res) {
+                                kmvc_getbit(bb, &ctx->g, res);
+                                if (!res) {     // fill whole 2x2 block
+                                    val = bytestream2_get_byte(&ctx->g);
+                                    BLK(ctx->cur, l1x, l1y) = val;
+                                    BLK(ctx->cur, l1x + 1, l1y) = val;
+                                    BLK(ctx->cur, l1x, l1y + 1) = val;
+                                    BLK(ctx->cur, l1x + 1, l1y + 1) = val;
+                                } else {        // copy block
+                                    val = bytestream2_get_byte(&ctx->g);
+                                    mx = (val & 0xF) - 8;
+                                    my = (val >> 4) - 8;
+                                    if ((l1x+mx) + 320*(l1y+my) < 0 || (l1x+mx) + 320*(l1y+my) > 318*198) {
+                                        av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+                                        return AVERROR_INVALIDDATA;
+                                    }
+                                    BLK(ctx->cur, l1x, l1y) = BLK(ctx->prev, l1x + mx, l1y + my);
+                                    BLK(ctx->cur, l1x + 1, l1y) =
+                                        BLK(ctx->prev, l1x + 1 + mx, l1y + my);
+                                    BLK(ctx->cur, l1x, l1y + 1) =
+                                        BLK(ctx->prev, l1x + mx, l1y + 1 + my);
+                                    BLK(ctx->cur, l1x + 1, l1y + 1) =
+                                        BLK(ctx->prev, l1x + 1 + mx, l1y + 1 + my);
+                                }
+                            } else {    // read values for block
+                                BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
+                                BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
+                                BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
+                                BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext * avctx, void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    KmvcContext *const ctx = avctx->priv_data;
+    AVFrame *frame = data;
+    uint8_t *out, *src;
+    int i, ret;
+    int header;
+    int blocksize;
+    const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+
+    bytestream2_init(&ctx->g, avpkt->data, avpkt->size);
+
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+
+    header = bytestream2_get_byte(&ctx->g);
+
+    /* blocksize 127 is really palette change event */
+    if (bytestream2_peek_byte(&ctx->g) == 127) {
+        bytestream2_skip(&ctx->g, 3);
+        for (i = 0; i < 127; i++) {
+            ctx->pal[i + (header & 0x81)] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g);
+            bytestream2_skip(&ctx->g, 1);
+        }
+        bytestream2_seek(&ctx->g, -127 * 4 - 3, SEEK_CUR);
+    }
+
+    if (header & KMVC_KEYFRAME) {
+        frame->key_frame = 1;
+        frame->pict_type = AV_PICTURE_TYPE_I;
+    } else {
+        frame->key_frame = 0;
+        frame->pict_type = AV_PICTURE_TYPE_P;
+    }
+
+    if (header & KMVC_PALETTE) {
+        frame->palette_has_changed = 1;
+        // palette starts from index 1 and has 127 entries
+        for (i = 1; i <= ctx->palsize; i++) {
+            ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g);
+        }
+    }
+
+    if (pal) {
+        frame->palette_has_changed = 1;
+        memcpy(ctx->pal, pal, AVPALETTE_SIZE);
+    }
+
+    if (ctx->setpal) {
+        ctx->setpal = 0;
+        frame->palette_has_changed = 1;
+    }
+
+    /* make the palette available on the way out */
+    memcpy(frame->data[1], ctx->pal, 1024);
+
+    blocksize = bytestream2_get_byte(&ctx->g);
+
+    if (blocksize != 8 && blocksize != 127) {
+        av_log(avctx, AV_LOG_ERROR, "Block size = %i\n", blocksize);
+        return AVERROR_INVALIDDATA;
+    }
+    memset(ctx->cur, 0, 320 * 200);
+    switch (header & KMVC_METHOD) {
+    case 0:
+    case 1: // used in palette changed event
+        memcpy(ctx->cur, ctx->prev, 320 * 200);
+        break;
+    case 3:
+        kmvc_decode_intra_8x8(ctx, avctx->width, avctx->height);
+        break;
+    case 4:
+        kmvc_decode_inter_8x8(ctx, avctx->width, avctx->height);
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown compression method %i\n", header & KMVC_METHOD);
+        return AVERROR_INVALIDDATA;
+    }
+
+    out = frame->data[0];
+    src = ctx->cur;
+    for (i = 0; i < avctx->height; i++) {
+        memcpy(out, src, avctx->width);
+        src += 320;
+        out += frame->linesize[0];
+    }
+
+    /* flip buffers */
+    if (ctx->cur == ctx->frm0) {
+        ctx->cur = ctx->frm1;
+        ctx->prev = ctx->frm0;
+    } else {
+        ctx->cur = ctx->frm0;
+        ctx->prev = ctx->frm1;
+    }
+
+    *got_frame = 1;
+
+    /* always report that the buffer was completely consumed */
+    return avpkt->size;
+}
+
+
+
+/*
+ * Init kmvc decoder
+ */
+static av_cold int decode_init(AVCodecContext * avctx)
+{
+    KmvcContext *const c = avctx->priv_data;
+    int i;
+
+    c->avctx = avctx;
+
+    if (avctx->width > 320 || avctx->height > 200) {
+        av_log(avctx, AV_LOG_ERROR, "KMVC supports frames <= 320x200\n");
+        return AVERROR(EINVAL);
+    }
+
+    c->frm0 = av_mallocz(320 * 200);
+    c->frm1 = av_mallocz(320 * 200);
+    c->cur = c->frm0;
+    c->prev = c->frm1;
+
+    for (i = 0; i < 256; i++) {
+        c->pal[i] = 0xFFU << 24 | i * 0x10101;
+    }
+
+    if (avctx->extradata_size < 12) {
+        av_log(avctx, AV_LOG_WARNING,
+               "Extradata missing, decoding may not work properly...\n");
+        c->palsize = 127;
+    } else {
+        c->palsize = AV_RL16(avctx->extradata + 10);
+        if (c->palsize >= (unsigned)MAX_PALSIZE) {
+            c->palsize = 127;
+            av_log(avctx, AV_LOG_ERROR, "KMVC palette too large\n");
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    if (avctx->extradata_size == 1036) {        // palette in extradata
+        uint8_t *src = avctx->extradata + 12;
+        for (i = 0; i < 256; i++) {
+            c->pal[i] = AV_RL32(src);
+            src += 4;
+        }
+        c->setpal = 1;
+    }
+
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    return 0;
+}
+
+
+
+/*
+ * Uninit kmvc decoder
+ */
+static av_cold int decode_end(AVCodecContext * avctx)
+{
+    KmvcContext *const c = avctx->priv_data;
+
+    av_freep(&c->frm0);
+    av_freep(&c->frm1);
+
+    return 0;
+}
+
+AVCodec ff_kmvc_decoder = {
+    .name           = "kmvc",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_KMVC,
+    .priv_data_size = sizeof(KmvcContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Karl Morton's video codec"),
+};