ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavcodec/xbmdec.c

@@ -0,0 +1,137 @@
+/*
+ * XBM image format
+ *
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * 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 "libavutil/avstring.h"
+
+#include "avcodec.h"
+#include "internal.h"
+#include "mathops.h"
+
+static int convert(uint8_t x)
+{
+    if (x >= 'a')
+        x -= 87;
+    else if (x >= 'A')
+        x -= 55;
+    else
+        x -= '0';
+    return x;
+}
+
+static int parse_str_int(const uint8_t *p, int len, const uint8_t *key)
+{
+    const uint8_t *end = p + len;
+
+    for(; p<end - strlen(key); p++) {
+        if (!memcmp(p, key, strlen(key)))
+            break;
+    }
+    p += strlen(key);
+    if (p >= end)
+        return INT_MIN;
+
+    for(; p<end; p++) {
+        char *eptr;
+        int64_t ret = strtol(p, &eptr, 10);
+        if ((const uint8_t *)eptr != p)
+            return ret;
+    }
+    return INT_MIN;
+}
+
+static int xbm_decode_frame(AVCodecContext *avctx, void *data,
+                            int *got_frame, AVPacket *avpkt)
+{
+    AVFrame *p = data;
+    int ret, linesize, i, j;
+    int width  = 0;
+    int height = 0;
+    const uint8_t *end, *ptr = avpkt->data;
+    const uint8_t *next;
+    uint8_t *dst;
+
+    avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
+    end = avpkt->data + avpkt->size;
+
+    width  = parse_str_int(avpkt->data, avpkt->size, "_width");
+    height = parse_str_int(avpkt->data, avpkt->size, "_height");
+
+    if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
+        return ret;
+
+    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+        return ret;
+
+    // goto start of image data
+    next = memchr(ptr, '{', avpkt->size);
+    if (!next)
+        next = memchr(ptr, '(', avpkt->size);
+    if (!next)
+        return AVERROR_INVALIDDATA;
+    ptr = next + 1;
+
+    linesize = (avctx->width + 7) / 8;
+    for (i = 0; i < avctx->height; i++) {
+        dst = p->data[0] + i * p->linesize[0];
+        for (j = 0; j < linesize; j++) {
+            uint8_t val;
+
+            while (ptr < end && *ptr != 'x' && *ptr != '$')
+                ptr++;
+
+            ptr ++;
+            if (ptr < end && av_isxdigit(*ptr)) {
+                val = convert(*ptr++);
+                if (av_isxdigit(*ptr))
+                    val = (val << 4) + convert(*ptr++);
+                *dst++ = ff_reverse[val];
+                if (av_isxdigit(*ptr) && j+1 < linesize) {
+                    j++;
+                    val = convert(*ptr++);
+                    if (av_isxdigit(*ptr))
+                        val = (val << 4) + convert(*ptr++);
+                    *dst++ = ff_reverse[val];
+                }
+            } else {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Unexpected data at %.8s.\n", ptr);
+                return AVERROR_INVALIDDATA;
+            }
+        }
+    }
+
+    p->key_frame = 1;
+    p->pict_type = AV_PICTURE_TYPE_I;
+
+    *got_frame       = 1;
+
+    return avpkt->size;
+}
+
+AVCodec ff_xbm_decoder = {
+    .name         = "xbm",
+    .long_name    = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
+    .type         = AVMEDIA_TYPE_VIDEO,
+    .id           = AV_CODEC_ID_XBM,
+    .decode       = xbm_decode_frame,
+    .capabilities = AV_CODEC_CAP_DR1,
+};