making act segmenter

1 files changed, 346 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/msvideo1.c b/ffmpeg/libavcodec/msvideo1.c
new file mode 100644
index 0000000..c5a1daa
--- /dev/null
+++ b/ffmpeg/libavcodec/msvideo1.c
@@ -0,0 +1,346 @@
+/*
+ * Microsoft Video-1 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
+ * Microsoft Video-1 Decoder by Mike Melanson (melanson@pcisys.net)
+ * For more information about the MS Video-1 format, visit:
+ *   http://www.pcisys.net/~melanson/codecs/
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "internal.h"
+
+#define PALETTE_COUNT 256
+#define CHECK_STREAM_PTR(n) \
+  if ((stream_ptr + n) > s->size ) { \
+    av_log(s->avctx, AV_LOG_ERROR, " MS Video-1 warning: stream_ptr out of bounds (%d >= %d)\n", \
+      stream_ptr + n, s->size); \
+    return; \
+  }
+
+typedef struct Msvideo1Context {
+
+    AVCodecContext *avctx;
+    AVFrame frame;
+
+    const unsigned char *buf;
+    int size;
+
+    int mode_8bit;  /* if it's not 8-bit, it's 16-bit */
+
+    uint32_t pal[256];
+} Msvideo1Context;
+
+static av_cold int msvideo1_decode_init(AVCodecContext *avctx)
+{
+    Msvideo1Context *s = avctx->priv_data;
+
+    s->avctx = avctx;
+
+    /* figure out the colorspace based on the presence of a palette */
+    if (s->avctx->bits_per_coded_sample == 8) {
+        s->mode_8bit = 1;
+        avctx->pix_fmt = AV_PIX_FMT_PAL8;
+    } else {
+        s->mode_8bit = 0;
+        avctx->pix_fmt = AV_PIX_FMT_RGB555;
+    }
+
+    avcodec_get_frame_defaults(&s->frame);
+
+    return 0;
+}
+
+static void msvideo1_decode_8bit(Msvideo1Context *s)
+{
+    int block_ptr, pixel_ptr;
+    int total_blocks;
+    int pixel_x, pixel_y;  /* pixel width and height iterators */
+    int block_x, block_y;  /* block width and height iterators */
+    int blocks_wide, blocks_high;  /* width and height in 4x4 blocks */
+    int block_inc;
+    int row_dec;
+
+    /* decoding parameters */
+    int stream_ptr;
+    unsigned char byte_a, byte_b;
+    unsigned short flags;
+    int skip_blocks;
+    unsigned char colors[8];
+    unsigned char *pixels = s->frame.data[0];
+    int stride = s->frame.linesize[0];
+
+    stream_ptr = 0;
+    skip_blocks = 0;
+    blocks_wide = s->avctx->width / 4;
+    blocks_high = s->avctx->height / 4;
+    total_blocks = blocks_wide * blocks_high;
+    block_inc = 4;
+    row_dec = stride + 4;
+
+    for (block_y = blocks_high; block_y > 0; block_y--) {
+        block_ptr = ((block_y * 4) - 1) * stride;
+        for (block_x = blocks_wide; block_x > 0; block_x--) {
+            /* check if this block should be skipped */
+            if (skip_blocks) {
+                block_ptr += block_inc;
+                skip_blocks--;
+                total_blocks--;
+                continue;
+            }
+
+            pixel_ptr = block_ptr;
+
+            /* get the next two bytes in the encoded data stream */
+            CHECK_STREAM_PTR(2);
+            byte_a = s->buf[stream_ptr++];
+            byte_b = s->buf[stream_ptr++];
+
+            /* check if the decode is finished */
+            if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0))
+                return;
+            else if ((byte_b & 0xFC) == 0x84) {
+                /* skip code, but don't count the current block */
+                skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
+            } else if (byte_b < 0x80) {
+                /* 2-color encoding */
+                flags = (byte_b << 8) | byte_a;
+
+                CHECK_STREAM_PTR(2);
+                colors[0] = s->buf[stream_ptr++];
+                colors[1] = s->buf[stream_ptr++];
+
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
+                        pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
+                    pixel_ptr -= row_dec;
+                }
+            } else if (byte_b >= 0x90) {
+                /* 8-color encoding */
+                flags = (byte_b << 8) | byte_a;
+
+                CHECK_STREAM_PTR(8);
+                memcpy(colors, &s->buf[stream_ptr], 8);
+                stream_ptr += 8;
+
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
+                        pixels[pixel_ptr++] =
+                            colors[((pixel_y & 0x2) << 1) +
+                                (pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
+                    pixel_ptr -= row_dec;
+                }
+            } else {
+                /* 1-color encoding */
+                colors[0] = byte_a;
+
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++)
+                        pixels[pixel_ptr++] = colors[0];
+                    pixel_ptr -= row_dec;
+                }
+            }
+
+            block_ptr += block_inc;
+            total_blocks--;
+        }
+    }
+
+    /* make the palette available on the way out */
+    if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
+        memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE);
+}
+
+static void msvideo1_decode_16bit(Msvideo1Context *s)
+{
+    int block_ptr, pixel_ptr;
+    int total_blocks;
+    int pixel_x, pixel_y;  /* pixel width and height iterators */
+    int block_x, block_y;  /* block width and height iterators */
+    int blocks_wide, blocks_high;  /* width and height in 4x4 blocks */
+    int block_inc;
+    int row_dec;
+
+    /* decoding parameters */
+    int stream_ptr;
+    unsigned char byte_a, byte_b;
+    unsigned short flags;
+    int skip_blocks;
+    unsigned short colors[8];
+    unsigned short *pixels = (unsigned short *)s->frame.data[0];
+    int stride = s->frame.linesize[0] / 2;
+
+    stream_ptr = 0;
+    skip_blocks = 0;
+    blocks_wide = s->avctx->width / 4;
+    blocks_high = s->avctx->height / 4;
+    total_blocks = blocks_wide * blocks_high;
+    block_inc = 4;
+    row_dec = stride + 4;
+
+    for (block_y = blocks_high; block_y > 0; block_y--) {
+        block_ptr = ((block_y * 4) - 1) * stride;
+        for (block_x = blocks_wide; block_x > 0; block_x--) {
+            /* check if this block should be skipped */
+            if (skip_blocks) {
+                block_ptr += block_inc;
+                skip_blocks--;
+                total_blocks--;
+                continue;
+            }
+
+            pixel_ptr = block_ptr;
+
+            /* get the next two bytes in the encoded data stream */
+            CHECK_STREAM_PTR(2);
+            byte_a = s->buf[stream_ptr++];
+            byte_b = s->buf[stream_ptr++];
+
+            /* check if the decode is finished */
+            if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0)) {
+                return;
+            } else if ((byte_b & 0xFC) == 0x84) {
+                /* skip code, but don't count the current block */
+                skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
+            } else if (byte_b < 0x80) {
+                /* 2- or 8-color encoding modes */
+                flags = (byte_b << 8) | byte_a;
+
+                CHECK_STREAM_PTR(4);
+                colors[0] = AV_RL16(&s->buf[stream_ptr]);
+                stream_ptr += 2;
+                colors[1] = AV_RL16(&s->buf[stream_ptr]);
+                stream_ptr += 2;
+
+                if (colors[0] & 0x8000) {
+                    /* 8-color encoding */
+                    CHECK_STREAM_PTR(12);
+                    colors[2] = AV_RL16(&s->buf[stream_ptr]);
+                    stream_ptr += 2;
+                    colors[3] = AV_RL16(&s->buf[stream_ptr]);
+                    stream_ptr += 2;
+                    colors[4] = AV_RL16(&s->buf[stream_ptr]);
+                    stream_ptr += 2;
+                    colors[5] = AV_RL16(&s->buf[stream_ptr]);
+                    stream_ptr += 2;
+                    colors[6] = AV_RL16(&s->buf[stream_ptr]);
+                    stream_ptr += 2;
+                    colors[7] = AV_RL16(&s->buf[stream_ptr]);
+                    stream_ptr += 2;
+
+                    for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                        for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
+                            pixels[pixel_ptr++] =
+                                colors[((pixel_y & 0x2) << 1) +
+                                    (pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
+                        pixel_ptr -= row_dec;
+                    }
+                } else {
+                    /* 2-color encoding */
+                    for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                        for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
+                            pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
+                        pixel_ptr -= row_dec;
+                    }
+                }
+            } else {
+                /* otherwise, it's a 1-color block */
+                colors[0] = (byte_b << 8) | byte_a;
+
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++)
+                        pixels[pixel_ptr++] = colors[0];
+                    pixel_ptr -= row_dec;
+                }
+            }
+
+            block_ptr += block_inc;
+            total_blocks--;
+        }
+    }
+}
+
+static int msvideo1_decode_frame(AVCodecContext *avctx,
+                                void *data, int *got_frame,
+                                AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    Msvideo1Context *s = avctx->priv_data;
+    int ret;
+
+    s->buf = buf;
+    s->size = buf_size;
+
+    if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
+        return ret;
+
+    if (s->mode_8bit) {
+        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+
+        if (pal) {
+            memcpy(s->pal, pal, AVPALETTE_SIZE);
+            s->frame.palette_has_changed = 1;
+        }
+    }
+
+    if (s->mode_8bit)
+        msvideo1_decode_8bit(s);
+    else
+        msvideo1_decode_16bit(s);
+
+    if ((ret = av_frame_ref(data, &s->frame)) < 0)
+        return ret;
+
+    *got_frame      = 1;
+
+    /* report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static av_cold int msvideo1_decode_end(AVCodecContext *avctx)
+{
+    Msvideo1Context *s = avctx->priv_data;
+
+    av_frame_unref(&s->frame);
+
+    return 0;
+}
+
+AVCodec ff_msvideo1_decoder = {
+    .name           = "msvideo1",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MSVIDEO1,
+    .priv_data_size = sizeof(Msvideo1Context),
+    .init           = msvideo1_decode_init,
+    .close          = msvideo1_decode_end,
+    .decode         = msvideo1_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft Video 1"),
+};