making act segmenter

1 files changed, 638 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/xan.c b/ffmpeg/libavcodec/xan.c
new file mode 100644
index 0000000..2ee2291
--- /dev/null
+++ b/ffmpeg/libavcodec/xan.c
@@ -0,0 +1,638 @@
+/*
+ * Wing Commander/Xan Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * 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
+ * Xan video decoder for Wing Commander III computer game
+ * by Mario Brito (mbrito@student.dei.uc.pt)
+ * and Mike Melanson (melanson@pcisys.net)
+ *
+ * The xan_wc3 decoder outputs PAL8 data.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "internal.h"
+
+#define RUNTIME_GAMMA 0
+
+#define VGA__TAG MKTAG('V', 'G', 'A', ' ')
+#define PALT_TAG MKTAG('P', 'A', 'L', 'T')
+#define SHOT_TAG MKTAG('S', 'H', 'O', 'T')
+#define PALETTE_COUNT 256
+#define PALETTE_SIZE (PALETTE_COUNT * 3)
+#define PALETTES_MAX 256
+
+typedef struct XanContext {
+
+    AVCodecContext *avctx;
+    AVFrame last_frame;
+
+    const unsigned char *buf;
+    int size;
+
+    /* scratch space */
+    unsigned char *buffer1;
+    int buffer1_size;
+    unsigned char *buffer2;
+    int buffer2_size;
+
+    unsigned *palettes;
+    int palettes_count;
+    int cur_palette;
+
+    int frame_size;
+
+} XanContext;
+
+static av_cold int xan_decode_init(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    s->frame_size = 0;
+
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    s->buffer1_size = avctx->width * avctx->height;
+    s->buffer1 = av_malloc(s->buffer1_size);
+    if (!s->buffer1)
+        return AVERROR(ENOMEM);
+    s->buffer2_size = avctx->width * avctx->height;
+    s->buffer2 = av_malloc(s->buffer2_size + 130);
+    if (!s->buffer2) {
+        av_freep(&s->buffer1);
+        return AVERROR(ENOMEM);
+    }
+    avcodec_get_frame_defaults(&s->last_frame);
+
+    return 0;
+}
+
+static int xan_huffman_decode(unsigned char *dest, int dest_len,
+                              const unsigned char *src, int src_len)
+{
+    unsigned char byte = *src++;
+    unsigned char ival = byte + 0x16;
+    const unsigned char * ptr = src + byte*2;
+    int ptr_len = src_len - 1 - byte*2;
+    unsigned char val = ival;
+    unsigned char *dest_end = dest + dest_len;
+    GetBitContext gb;
+
+    if (ptr_len < 0)
+        return AVERROR_INVALIDDATA;
+
+    init_get_bits(&gb, ptr, ptr_len * 8);
+
+    while (val != 0x16) {
+        unsigned idx = val - 0x17 + get_bits1(&gb) * byte;
+        if (idx >= 2 * byte)
+            return AVERROR_INVALIDDATA;
+        val = src[idx];
+
+        if (val < 0x16) {
+            if (dest >= dest_end)
+                return 0;
+            *dest++ = val;
+            val = ival;
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * unpack simple compression
+ *
+ * @param dest destination buffer of dest_len, must be padded with at least 130 bytes
+ */
+static void xan_unpack(unsigned char *dest, int dest_len,
+                       const unsigned char *src, int src_len)
+{
+    unsigned char opcode;
+    int size;
+    unsigned char *dest_org = dest;
+    unsigned char *dest_end = dest + dest_len;
+    GetByteContext ctx;
+
+    bytestream2_init(&ctx, src, src_len);
+    while (dest < dest_end && bytestream2_get_bytes_left(&ctx)) {
+        opcode = bytestream2_get_byte(&ctx);
+
+        if (opcode < 0xe0) {
+            int size2, back;
+            if ((opcode & 0x80) == 0) {
+                size = opcode & 3;
+
+                back  = ((opcode & 0x60) << 3) + bytestream2_get_byte(&ctx) + 1;
+                size2 = ((opcode & 0x1c) >> 2) + 3;
+            } else if ((opcode & 0x40) == 0) {
+                size = bytestream2_peek_byte(&ctx) >> 6;
+
+                back  = (bytestream2_get_be16(&ctx) & 0x3fff) + 1;
+                size2 = (opcode & 0x3f) + 4;
+            } else {
+                size = opcode & 3;
+
+                back  = ((opcode & 0x10) << 12) + bytestream2_get_be16(&ctx) + 1;
+                size2 = ((opcode & 0x0c) <<  6) + bytestream2_get_byte(&ctx) + 5;
+            }
+
+            if (dest_end - dest < size + size2 ||
+                dest + size - dest_org < back ||
+                bytestream2_get_bytes_left(&ctx) < size)
+                return;
+            bytestream2_get_buffer(&ctx, 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 || bytestream2_get_bytes_left(&ctx) < size)
+                return;
+            bytestream2_get_buffer(&ctx, dest, size);
+            dest += size;
+            if (finish)
+                return;
+        }
+    }
+}
+
+static inline void xan_wc3_output_pixel_run(XanContext *s, AVFrame *frame,
+    const unsigned char *pixel_buffer, int x, int y, int pixel_count)
+{
+    int stride;
+    int line_inc;
+    int index;
+    int current_x;
+    int width = s->avctx->width;
+    unsigned char *palette_plane;
+
+    palette_plane = frame->data[0];
+    stride = frame->linesize[0];
+    line_inc = stride - width;
+    index = y * stride + x;
+    current_x = x;
+    while (pixel_count && index < s->frame_size) {
+        int count = FFMIN(pixel_count, width - current_x);
+        memcpy(palette_plane + index, pixel_buffer, count);
+        pixel_count  -= count;
+        index        += count;
+        pixel_buffer += count;
+        current_x    += count;
+
+        if (current_x >= width) {
+            index += line_inc;
+            current_x = 0;
+        }
+    }
+}
+
+static inline void xan_wc3_copy_pixel_run(XanContext *s, AVFrame *frame,
+                                          int x, int y,
+                                          int pixel_count, int motion_x,
+                                          int motion_y)
+{
+    int stride;
+    int line_inc;
+    int curframe_index, prevframe_index;
+    int curframe_x, prevframe_x;
+    int width = s->avctx->width;
+    unsigned char *palette_plane, *prev_palette_plane;
+
+    if (y + motion_y < 0 || y + motion_y >= s->avctx->height ||
+        x + motion_x < 0 || x + motion_x >= s->avctx->width)
+        return;
+
+    palette_plane = frame->data[0];
+    prev_palette_plane = s->last_frame.data[0];
+    if (!prev_palette_plane)
+        prev_palette_plane = palette_plane;
+    stride = frame->linesize[0];
+    line_inc = stride - width;
+    curframe_index = y * stride + x;
+    curframe_x = x;
+    prevframe_index = (y + motion_y) * stride + x + motion_x;
+    prevframe_x = x + motion_x;
+    while (pixel_count &&
+           curframe_index  < s->frame_size &&
+           prevframe_index < s->frame_size) {
+        int count = FFMIN3(pixel_count, width - curframe_x,
+                           width - prevframe_x);
+
+        memcpy(palette_plane + curframe_index,
+               prev_palette_plane + prevframe_index, count);
+        pixel_count     -= count;
+        curframe_index  += count;
+        prevframe_index += count;
+        curframe_x      += count;
+        prevframe_x     += count;
+
+        if (curframe_x >= width) {
+            curframe_index += line_inc;
+            curframe_x = 0;
+        }
+
+        if (prevframe_x >= width) {
+            prevframe_index += line_inc;
+            prevframe_x = 0;
+        }
+    }
+}
+
+static int xan_wc3_decode_frame(XanContext *s, AVFrame *frame)
+{
+
+    int width  = s->avctx->width;
+    int height = s->avctx->height;
+    int total_pixels = width * height;
+    unsigned char opcode;
+    unsigned char flag = 0;
+    int size = 0;
+    int motion_x, motion_y;
+    int x, y;
+
+    unsigned char *opcode_buffer = s->buffer1;
+    unsigned char *opcode_buffer_end = s->buffer1 + s->buffer1_size;
+    int opcode_buffer_size = s->buffer1_size;
+    const unsigned char *imagedata_buffer = s->buffer2;
+
+    /* pointers to segments inside the compressed chunk */
+    const unsigned char *huffman_segment;
+    const unsigned char *size_segment;
+    const unsigned char *vector_segment;
+    const unsigned char *imagedata_segment;
+    const unsigned char *buf_end = s->buf + s->size;
+    int huffman_offset, size_offset, vector_offset, imagedata_offset,
+        imagedata_size;
+
+    if (s->size < 8)
+        return AVERROR_INVALIDDATA;
+
+    huffman_offset    = AV_RL16(&s->buf[0]);
+    size_offset       = AV_RL16(&s->buf[2]);
+    vector_offset     = AV_RL16(&s->buf[4]);
+    imagedata_offset  = AV_RL16(&s->buf[6]);
+
+    if (huffman_offset   >= s->size ||
+        size_offset      >= s->size ||
+        vector_offset    >= s->size ||
+        imagedata_offset >= s->size)
+        return AVERROR_INVALIDDATA;
+
+    huffman_segment   = s->buf + huffman_offset;
+    size_segment      = s->buf + size_offset;
+    vector_segment    = s->buf + vector_offset;
+    imagedata_segment = s->buf + imagedata_offset;
+
+    if (xan_huffman_decode(opcode_buffer, opcode_buffer_size,
+                           huffman_segment, s->size - huffman_offset) < 0)
+        return AVERROR_INVALIDDATA;
+
+    if (imagedata_segment[0] == 2) {
+        xan_unpack(s->buffer2, s->buffer2_size,
+                   &imagedata_segment[1], s->size - imagedata_offset - 1);
+        imagedata_size = s->buffer2_size;
+    } else {
+        imagedata_size = s->size - imagedata_offset - 1;
+        imagedata_buffer = &imagedata_segment[1];
+    }
+
+    /* use the decoded data segments to build the frame */
+    x = y = 0;
+    while (total_pixels && opcode_buffer < opcode_buffer_end) {
+
+        opcode = *opcode_buffer++;
+        size = 0;
+
+        switch (opcode) {
+
+        case 0:
+            flag ^= 1;
+            continue;
+
+        case 1:
+        case 2:
+        case 3:
+        case 4:
+        case 5:
+        case 6:
+        case 7:
+        case 8:
+            size = opcode;
+            break;
+
+        case 12:
+        case 13:
+        case 14:
+        case 15:
+        case 16:
+        case 17:
+        case 18:
+            size += (opcode - 10);
+            break;
+
+        case 9:
+        case 19:
+            if (buf_end - size_segment < 1) {
+                av_log(s->avctx, AV_LOG_ERROR, "size_segment overread\n");
+                return AVERROR_INVALIDDATA;
+            }
+            size = *size_segment++;
+            break;
+
+        case 10:
+        case 20:
+            if (buf_end - size_segment < 2) {
+                av_log(s->avctx, AV_LOG_ERROR, "size_segment overread\n");
+                return AVERROR_INVALIDDATA;
+            }
+            size = AV_RB16(&size_segment[0]);
+            size_segment += 2;
+            break;
+
+        case 11:
+        case 21:
+            if (buf_end - size_segment < 3) {
+                av_log(s->avctx, AV_LOG_ERROR, "size_segment overread\n");
+                return AVERROR_INVALIDDATA;
+            }
+            size = AV_RB24(size_segment);
+            size_segment += 3;
+            break;
+        }
+
+        if (size > total_pixels)
+            break;
+
+        if (opcode < 12) {
+            flag ^= 1;
+            if (flag) {
+                /* run of (size) pixels is unchanged from last frame */
+                xan_wc3_copy_pixel_run(s, frame, x, y, size, 0, 0);
+            } else {
+                /* output a run of pixels from imagedata_buffer */
+                if (imagedata_size < size)
+                    break;
+                xan_wc3_output_pixel_run(s, frame, imagedata_buffer, x, y, size);
+                imagedata_buffer += size;
+                imagedata_size -= size;
+            }
+        } else {
+            if (vector_segment >= buf_end) {
+                av_log(s->avctx, AV_LOG_ERROR, "vector_segment overread\n");
+                return AVERROR_INVALIDDATA;
+            }
+            /* run-based motion compensation from last frame */
+            motion_x = sign_extend(*vector_segment >> 4,  4);
+            motion_y = sign_extend(*vector_segment & 0xF, 4);
+            vector_segment++;
+
+            /* copy a run of pixels from the previous frame */
+            xan_wc3_copy_pixel_run(s, frame, x, y, size, motion_x, motion_y);
+
+            flag = 0;
+        }
+
+        /* coordinate accounting */
+        total_pixels -= size;
+        y += (x + size) / width;
+        x  = (x + size) % width;
+    }
+    return 0;
+}
+
+#if RUNTIME_GAMMA
+static inline unsigned mul(unsigned a, unsigned b)
+{
+    return (a * b) >> 16;
+}
+
+static inline unsigned pow4(unsigned a)
+{
+    unsigned square = mul(a, a);
+    return mul(square, square);
+}
+
+static inline unsigned pow5(unsigned a)
+{
+    return mul(pow4(a), a);
+}
+
+static uint8_t gamma_corr(uint8_t in) {
+    unsigned lo, hi = 0xff40, target;
+    int i = 15;
+    in = (in << 2) | (in >> 6);
+    /*  equivalent float code:
+    if (in >= 252)
+        return 253;
+    return round(pow(in / 256.0, 0.8) * 256);
+    */
+    lo = target = in << 8;
+    do {
+        unsigned mid = (lo + hi) >> 1;
+        unsigned pow = pow5(mid);
+        if (pow > target) hi = mid;
+        else lo = mid;
+    } while (--i);
+    return (pow4((lo + hi) >> 1) + 0x80) >> 8;
+}
+#else
+/**
+ * This is a gamma correction that xan3 applies to all palette entries.
+ *
+ * There is a peculiarity, namely that the values are clamped to 253 -
+ * it seems likely that this table was calculated by a buggy fixed-point
+ * implementation, the one above under RUNTIME_GAMMA behaves like this for
+ * example.
+ * The exponent value of 0.8 can be explained by this as well, since 0.8 = 4/5
+ * and thus pow(x, 0.8) is still easy to calculate.
+ * Also, the input values are first rotated to the left by 2.
+ */
+static const uint8_t gamma_lookup[256] = {
+    0x00, 0x09, 0x10, 0x16, 0x1C, 0x21, 0x27, 0x2C,
+    0x31, 0x35, 0x3A, 0x3F, 0x43, 0x48, 0x4C, 0x50,
+    0x54, 0x59, 0x5D, 0x61, 0x65, 0x69, 0x6D, 0x71,
+    0x75, 0x79, 0x7D, 0x80, 0x84, 0x88, 0x8C, 0x8F,
+    0x93, 0x97, 0x9A, 0x9E, 0xA2, 0xA5, 0xA9, 0xAC,
+    0xB0, 0xB3, 0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8,
+    0xCB, 0xCF, 0xD2, 0xD5, 0xD9, 0xDC, 0xDF, 0xE3,
+    0xE6, 0xE9, 0xED, 0xF0, 0xF3, 0xF6, 0xFA, 0xFD,
+    0x03, 0x0B, 0x12, 0x18, 0x1D, 0x23, 0x28, 0x2D,
+    0x32, 0x36, 0x3B, 0x40, 0x44, 0x49, 0x4D, 0x51,
+    0x56, 0x5A, 0x5E, 0x62, 0x66, 0x6A, 0x6E, 0x72,
+    0x76, 0x7A, 0x7D, 0x81, 0x85, 0x89, 0x8D, 0x90,
+    0x94, 0x98, 0x9B, 0x9F, 0xA2, 0xA6, 0xAA, 0xAD,
+    0xB1, 0xB4, 0xB8, 0xBB, 0xBF, 0xC2, 0xC5, 0xC9,
+    0xCC, 0xD0, 0xD3, 0xD6, 0xDA, 0xDD, 0xE0, 0xE4,
+    0xE7, 0xEA, 0xED, 0xF1, 0xF4, 0xF7, 0xFA, 0xFD,
+    0x05, 0x0D, 0x13, 0x19, 0x1F, 0x24, 0x29, 0x2E,
+    0x33, 0x38, 0x3C, 0x41, 0x45, 0x4A, 0x4E, 0x52,
+    0x57, 0x5B, 0x5F, 0x63, 0x67, 0x6B, 0x6F, 0x73,
+    0x77, 0x7B, 0x7E, 0x82, 0x86, 0x8A, 0x8D, 0x91,
+    0x95, 0x99, 0x9C, 0xA0, 0xA3, 0xA7, 0xAA, 0xAE,
+    0xB2, 0xB5, 0xB9, 0xBC, 0xBF, 0xC3, 0xC6, 0xCA,
+    0xCD, 0xD0, 0xD4, 0xD7, 0xDA, 0xDE, 0xE1, 0xE4,
+    0xE8, 0xEB, 0xEE, 0xF1, 0xF5, 0xF8, 0xFB, 0xFD,
+    0x07, 0x0E, 0x15, 0x1A, 0x20, 0x25, 0x2A, 0x2F,
+    0x34, 0x39, 0x3D, 0x42, 0x46, 0x4B, 0x4F, 0x53,
+    0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C, 0x70, 0x74,
+    0x78, 0x7C, 0x7F, 0x83, 0x87, 0x8B, 0x8E, 0x92,
+    0x96, 0x99, 0x9D, 0xA1, 0xA4, 0xA8, 0xAB, 0xAF,
+    0xB2, 0xB6, 0xB9, 0xBD, 0xC0, 0xC4, 0xC7, 0xCB,
+    0xCE, 0xD1, 0xD5, 0xD8, 0xDB, 0xDF, 0xE2, 0xE5,
+    0xE9, 0xEC, 0xEF, 0xF2, 0xF6, 0xF9, 0xFC, 0xFD
+};
+#endif
+
+static int xan_decode_frame(AVCodecContext *avctx,
+                            void *data, int *got_frame,
+                            AVPacket *avpkt)
+{
+    AVFrame *frame = data;
+    const uint8_t *buf = avpkt->data;
+    int ret, buf_size = avpkt->size;
+    XanContext *s = avctx->priv_data;
+    GetByteContext ctx;
+    int tag = 0;
+
+    bytestream2_init(&ctx, buf, buf_size);
+    while (bytestream2_get_bytes_left(&ctx) > 8 && tag != VGA__TAG) {
+        unsigned *tmpptr;
+        uint32_t new_pal;
+        int size;
+        int i;
+        tag  = bytestream2_get_le32(&ctx);
+        size = bytestream2_get_be32(&ctx);
+        if(size < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Invalid tag size %d\n", size);
+            return AVERROR_INVALIDDATA;
+        }
+        size = FFMIN(size, bytestream2_get_bytes_left(&ctx));
+        switch (tag) {
+        case PALT_TAG:
+            if (size < PALETTE_SIZE)
+                return AVERROR_INVALIDDATA;
+            if (s->palettes_count >= PALETTES_MAX)
+                return AVERROR_INVALIDDATA;
+            tmpptr = av_realloc(s->palettes,
+                                (s->palettes_count + 1) * AVPALETTE_SIZE);
+            if (!tmpptr)
+                return AVERROR(ENOMEM);
+            s->palettes = tmpptr;
+            tmpptr += s->palettes_count * AVPALETTE_COUNT;
+            for (i = 0; i < PALETTE_COUNT; i++) {
+#if RUNTIME_GAMMA
+                int r = gamma_corr(bytestream2_get_byteu(&ctx));
+                int g = gamma_corr(bytestream2_get_byteu(&ctx));
+                int b = gamma_corr(bytestream2_get_byteu(&ctx));
+#else
+                int r = gamma_lookup[bytestream2_get_byteu(&ctx)];
+                int g = gamma_lookup[bytestream2_get_byteu(&ctx)];
+                int b = gamma_lookup[bytestream2_get_byteu(&ctx)];
+#endif
+                *tmpptr++ = (0xFFU << 24) | (r << 16) | (g << 8) | b;
+            }
+            s->palettes_count++;
+            break;
+        case SHOT_TAG:
+            if (size < 4)
+                return AVERROR_INVALIDDATA;
+            new_pal = bytestream2_get_le32(&ctx);
+            if (new_pal < s->palettes_count) {
+                s->cur_palette = new_pal;
+            } else
+                av_log(avctx, AV_LOG_ERROR, "Invalid palette selected\n");
+            break;
+        case VGA__TAG:
+            break;
+        default:
+            bytestream2_skip(&ctx, size);
+            break;
+        }
+    }
+    buf_size = bytestream2_get_bytes_left(&ctx);
+
+    if (s->palettes_count <= 0) {
+        av_log(s->avctx, AV_LOG_ERROR, "No palette found\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+        return ret;
+
+    if (!s->frame_size)
+        s->frame_size = frame->linesize[0] * s->avctx->height;
+
+    memcpy(frame->data[1],
+           s->palettes + s->cur_palette * AVPALETTE_COUNT, AVPALETTE_SIZE);
+
+    s->buf = ctx.buffer;
+    s->size = buf_size;
+
+    if (xan_wc3_decode_frame(s, frame) < 0)
+        return AVERROR_INVALIDDATA;
+
+    av_frame_unref(&s->last_frame);
+    if ((ret = av_frame_ref(&s->last_frame, frame)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static av_cold int xan_decode_end(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+
+    av_frame_unref(&s->last_frame);
+
+    av_freep(&s->buffer1);
+    av_freep(&s->buffer2);
+    av_freep(&s->palettes);
+
+    return 0;
+}
+
+AVCodec ff_xan_wc3_decoder = {
+    .name           = "xan_wc3",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_XAN_WC3,
+    .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 III / Xan"),
+};