CamStudio decoder, only 32 bit lzo mode is tested

Originally committed as revision 4836 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 270 insertions, 0 deletions

diff --git a/libavcodec/cscd.c b/libavcodec/cscd.c
new file mode 100644
index 0000000000..fdc336d4dc
--- /dev/null
+++ b/libavcodec/cscd.c
@@ -0,0 +1,270 @@
+/*
+ * CamStudio decoder
+ * Copyright (c) 2006 Reimar Doeffinger
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "avcodec.h"
+
+#ifdef CONFIG_ZLIB
+#include <zlib.h>
+#endif
+#ifdef CONFIG_LZO
+#include <lzo1x.h>
+#endif
+
+typedef struct {
+    AVFrame pic;
+    int linelen, height, bpp;
+    unsigned int decomp_size;
+    unsigned char* decomp_buf;
+} CamStudioContext;
+
+static void copy_frame_default(AVFrame *f, uint8_t *src,
+                               int linelen, int height) {
+    int i;
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        memcpy(dst, src, linelen);
+        src += linelen;
+        dst -= f->linesize[0];
+    }
+}
+
+static void add_frame_default(AVFrame *f, uint8_t *src,
+                              int linelen, int height) {
+    int i, j;
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        for (j = linelen; j; j--)
+            *dst++ += *src++;
+        dst -= f->linesize[0] + linelen;
+    }
+}
+
+#ifndef WORDS_BIGENDIAN
+#define copy_frame_16 copy_frame_default
+#define copy_frame_32 copy_frame_default
+#define add_frame_16 add_frame_default
+#define add_frame_32 add_frame_default
+#else
+static void copy_frame_16(AVFrame *f, uint8_t *src,
+                          int linelen, int height) {
+    int i, j;
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        for (j = linelen / 2; j; j--) {
+          dst[0] = src[1];
+          dst[1] = src[0];
+          src += 2;
+          dst += 2;
+        }
+        dst -= f->linesize[0] + linelen;
+    }
+}
+
+static void copy_frame_32(AVFrame *f, uint8_t *src,
+                          int linelen, int height) {
+    int i, j;
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        for (j = linelen / 4; j; j--) {
+          dst[0] = src[3];
+          dst[1] = src[2];
+          dst[2] = src[1];
+          dst[3] = src[0];
+          src += 4;
+          dst += 4;
+        }
+        dst -= f->linesize[0] + linelen;
+    }
+}
+
+static void add_frame_16(AVFrame *f, uint8_t *src,
+                         int linelen, int height) {
+    int i, j;
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        for (j = linelen / 2; j; j--) {
+          dst[0] += src[1];
+          dst[1] += src[0];
+          src += 2;
+          dst += 2;
+        }
+        dst -= f->linesize[0] + linelen;
+    }
+}
+
+static void add_frame_32(AVFrame *f, uint8_t *src,
+                         int linelen, int height) {
+    int i, j;
+    uint8_t *dst = f->data[0];
+    dst += (height - 1) * f->linesize[0];
+    for (i = height; i; i--) {
+        for (j = linelen / 4; j; j--) {
+          dst[0] += src[3];
+          dst[1] += src[2];
+          dst[2] += src[1];
+          dst[3] += src[0];
+          src += 4;
+          dst += 4;
+        }
+        dst -= f->linesize[0] + linelen;
+    }
+}
+#endif
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+                        uint8_t *buf, int buf_size) {
+    CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
+    AVFrame *picture = data;
+
+    if (buf_size < 2) {
+        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
+        return -1;
+    }
+
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+    c->pic.reference = 1;
+    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
+                          FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+    if (avctx->get_buffer(avctx, &c->pic) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    // decompress data
+    switch ((buf[0] >> 1) & 7) {
+        case 0: { // lzo compression
+#ifdef CONFIG_LZO
+            unsigned int dlen = c->decomp_size;
+            if (lzo1x_decompress_safe(&buf[2], buf_size - 2,
+                       c->decomp_buf, &dlen, NULL) != LZO_E_OK)
+                av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
+            break;
+#else
+            av_log(avctx, AV_LOG_ERROR, "compiled without lzo (GPL) support\n");
+            return -1;
+#endif
+        }
+        case 1: { // zlib compression
+#ifdef 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 -1;
+#endif
+        }
+        default:
+            av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
+            return -1;
+    }
+
+    // flip upside down, add difference frame
+    if (buf[0] & 1) { // keyframe
+        c->pic.pict_type = FF_I_TYPE;
+        c->pic.key_frame = 1;
+        switch (c->bpp) {
+          case 16:
+              copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
+              break;
+          case 32:
+              copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
+              break;
+          default:
+              copy_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
+        }
+    } else {
+        c->pic.pict_type = FF_P_TYPE;
+        c->pic.key_frame = 0;
+        switch (c->bpp) {
+          case 16:
+              add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
+              break;
+          case 32:
+              add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
+              break;
+          default:
+              add_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
+        }
+    }
+
+    *picture = c->pic;
+    *data_size = sizeof(AVFrame);
+    return buf_size;
+}
+
+static int decode_init(AVCodecContext *avctx) {
+    CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
+    if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
+        return 1;
+    }
+    avctx->has_b_frames = 0;
+    switch (avctx->bits_per_sample) {
+        case 16: avctx->pix_fmt = PIX_FMT_RGB565; break;
+        case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
+        case 32: avctx->pix_fmt = PIX_FMT_RGBA32; break;
+        default:
+            av_log(avctx, AV_LOG_ERROR,
+                   "CamStudio codec error: unvalid depth %i bpp\n",
+                   avctx->bits_per_sample);
+             return 1;
+    }
+    c->bpp = avctx->bits_per_sample;
+    c->pic.data[0] = NULL;
+    c->linelen = avctx->width * avctx->bits_per_sample / 8;
+    c->height = avctx->height;
+    c->decomp_size = c->height * c->linelen;
+    c->decomp_buf = av_malloc(c->decomp_size);
+    if (!c->decomp_buf) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
+        return 1;
+    }
+    return 0;
+}
+
+static int decode_end(AVCodecContext *avctx) {
+    CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
+    av_freep(&c->decomp_buf);
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+    return 0;
+}
+
+AVCodec cscd_decoder = {
+    "camstudio",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_CSCD,
+    sizeof(CamStudioContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame,
+    CODEC_CAP_DR1,
+};
+