making act segmenter

1 files changed, 170 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/cscd.c b/ffmpeg/libavcodec/cscd.c
new file mode 100644
index 0000000..0a5fa69
--- /dev/null
+++ b/ffmpeg/libavcodec/cscd.c
@@ -0,0 +1,170 @@
+/*
+ * CamStudio decoder
+ * Copyright (c) 2006 Reimar Doeffinger
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+
+#include "avcodec.h"
+#include "internal.h"
+#include "libavutil/common.h"
+
+#if CONFIG_ZLIB
+#include <zlib.h>
+#endif
+#include "libavutil/lzo.h"
+
+typedef struct {
+    AVFrame *pic;
+    int linelen, height, bpp;
+    unsigned int decomp_size;
+    unsigned char* decomp_buf;
+} CamStudioContext;
+
+static void copy_frame_default(AVFrame *f, const uint8_t *src,
+                               int linelen, int height) {
+    int i, src_stride = FFALIGN(linelen, 4);
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        memcpy(dst, src, linelen);
+        src += src_stride;
+        dst -= f->linesize[0];
+    }
+}
+
+static void add_frame_default(AVFrame *f, const uint8_t *src,
+                              int linelen, int height) {
+    int i, j, src_stride = FFALIGN(linelen, 4);
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        for (j = linelen; j; j--)
+            *dst++ += *src++;
+        src += src_stride - linelen;
+        dst -= f->linesize[0] + linelen;
+    }
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+                        AVPacket *avpkt) {
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    CamStudioContext *c = avctx->priv_data;
+    int ret;
+
+    if (buf_size < 2) {
+        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
+        return ret;
+
+    // decompress data
+    switch ((buf[0] >> 1) & 7) {
+        case 0: { // lzo compression
+            int outlen = c->decomp_size, inlen = buf_size - 2;
+            if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
+                av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
+            break;
+        }
+        case 1: { // zlib compression
+#if CONFIG_ZLIB
+            unsigned long dlen = c->decomp_size;
+            if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
+                av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
+            break;
+#else
+            av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
+            return AVERROR(ENOSYS);
+#endif
+        }
+        default:
+            av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
+            return AVERROR_INVALIDDATA;
+    }
+
+    // flip upside down, add difference frame
+    if (buf[0] & 1) { // keyframe
+        c->pic->pict_type = AV_PICTURE_TYPE_I;
+        c->pic->key_frame = 1;
+              copy_frame_default(c->pic, c->decomp_buf,
+                                 c->linelen, c->height);
+    } else {
+        c->pic->pict_type = AV_PICTURE_TYPE_P;
+        c->pic->key_frame = 0;
+              add_frame_default(c->pic, c->decomp_buf,
+                                c->linelen, c->height);
+    }
+
+    *got_frame = 1;
+    if ((ret = av_frame_ref(data, c->pic)) < 0)
+        return ret;
+
+    return buf_size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx) {
+    CamStudioContext *c = avctx->priv_data;
+    int stride;
+    switch (avctx->bits_per_coded_sample) {
+        case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555LE; break;
+        case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
+        case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break;
+        default:
+            av_log(avctx, AV_LOG_ERROR,
+                   "CamStudio codec error: invalid depth %i bpp\n",
+                   avctx->bits_per_coded_sample);
+            return AVERROR_INVALIDDATA;
+    }
+    c->bpp = avctx->bits_per_coded_sample;
+    c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
+    c->height = avctx->height;
+    stride = FFALIGN(c->linelen, 4);
+    c->decomp_size = c->height * stride;
+    c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
+    if (!c->decomp_buf) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
+        return AVERROR(ENOMEM);
+    }
+    c->pic = av_frame_alloc();
+    if (!c->pic)
+        return AVERROR(ENOMEM);
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx) {
+    CamStudioContext *c = avctx->priv_data;
+    av_freep(&c->decomp_buf);
+    av_frame_free(&c->pic);
+    return 0;
+}
+
+AVCodec ff_cscd_decoder = {
+    .name           = "camstudio",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_CSCD,
+    .priv_data_size = sizeof(CamStudioContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("CamStudio"),
+};