Sun Rasterfile decoder

Originally committed as revision 11342 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 196 insertions, 0 deletions

diff --git a/libavcodec/sunrast.c b/libavcodec/sunrast.c
new file mode 100644
index 0000000000..2fe4331028
--- /dev/null
+++ b/libavcodec/sunrast.c
@@ -0,0 +1,196 @@
+/*
+ * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
+ * Copyright (c) 2007, 2008 Ivo van Poorten
+ *
+ * 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 "avcodec.h"
+
+#define RT_OLD          0
+#define RT_STANDARD     1
+#define RT_BYTE_ENCODED 2
+#define RT_FORMAT_RGB   3
+#define RT_FORMAT_TIFF  4
+#define RT_FORMAT_IFF   5
+
+typedef struct SUNRASTContext {
+    AVFrame picture;
+} SUNRASTContext;
+
+static int sunrast_init(AVCodecContext *avctx) {
+    SUNRASTContext *s = avctx->priv_data;
+
+    avcodec_get_frame_defaults(&s->picture);
+    avctx->coded_frame= &s->picture;
+
+    return 0;
+}
+
+static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
+                                int *data_size, uint8_t *buf, int buf_size) {
+    SUNRASTContext * const s = avctx->priv_data;
+    AVFrame *picture = data;
+    AVFrame * const p = &s->picture;
+    unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
+    uint8_t *ptr, *bufstart = buf;
+
+    if (AV_RB32(buf) != 0x59a66a95) {
+        av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
+        return -1;
+    }
+
+    w         = AV_RB32(buf+4);
+    h         = AV_RB32(buf+8);
+    depth     = AV_RB32(buf+12);
+    type      = AV_RB32(buf+20);
+    maptype   = AV_RB32(buf+24);
+    maplength = AV_RB32(buf+28);
+
+    if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
+        av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
+        return -1;
+    }
+    if (type > RT_FORMAT_IFF) {
+        av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
+        return -1;
+    }
+    if (maptype & ~1) {
+        av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
+        return -1;
+    }
+
+    buf += 32;
+
+    switch (depth) {
+        case 1:
+            avctx->pix_fmt = PIX_FMT_MONOWHITE;
+            break;
+        case 8:
+            avctx->pix_fmt = PIX_FMT_PAL8;
+            break;
+        case 24:
+            avctx->pix_fmt = PIX_FMT_BGR24;
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
+            return -1;
+    }
+
+    if (p->data[0])
+        avctx->release_buffer(avctx, p);
+
+    if (avcodec_check_dimensions(avctx, w, h))
+        return -1;
+    if (w != avctx->width || h != avctx->height)
+        avcodec_set_dimensions(avctx, w, h);
+    if (avctx->get_buffer(avctx, p) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    p->pict_type = FF_I_TYPE;
+
+    if (depth != 8 && maplength) {
+        av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
+
+    } else if (depth == 8) {
+        unsigned int len = maplength / 3;
+
+        if (!maplength) {
+            av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
+            return -1;
+        }
+        if (maplength % 3 || maplength > 768) {
+            av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
+            return -1;
+        }
+
+        av_log(avctx, AV_LOG_DEBUG, "maplength %u\n", len);
+
+        ptr = p->data[1];
+        for (x=0; x<len; x++, ptr+=4)
+            *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
+    }
+
+    buf += maplength;
+
+    ptr    = p->data[0];
+    stride = p->linesize[0];
+
+    /* scanlines are aligned on 16 bit boundaries */
+    len  = (depth * w + 7) >> 3;
+    alen = len + (len&1);
+
+    if (type == RT_BYTE_ENCODED) {
+        int value, run;
+        uint8_t *end = ptr + h*stride;
+
+        x = 0;
+        while (ptr != end) {
+            run = 1;
+            if ((value = *buf++) == 0x80) {
+                run = *buf++ + 1;
+                if (run != 1)
+                    value = *buf++;
+            }
+            while (run--) {
+                if (x < len)
+                    ptr[x] = value;
+                if (++x >= alen) {
+                    x = 0;
+                    ptr += stride;
+                    if (ptr == end)
+                        break;
+                }
+            }
+        }
+    } else {
+        for (y=0; y<h; y++) {
+            memcpy(ptr, buf, len);
+            ptr += stride;
+            buf += alen;
+        }
+    }
+
+    *picture = s->picture;
+    *data_size = sizeof(AVFrame);
+
+    return buf - bufstart;
+}
+
+static int sunrast_end(AVCodecContext *avctx) {
+    SUNRASTContext *s = avctx->priv_data;
+
+    if(s->picture.data[0])
+        avctx->release_buffer(avctx, &s->picture);
+
+    return 0;
+}
+
+AVCodec sunrast_decoder = {
+    "sunrast",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_SUNRAST,
+    sizeof(SUNRASTContext),
+    sunrast_init,
+    NULL,
+    sunrast_end,
+    sunrast_decode_frame,
+    0,
+    NULL
+};