ffmpeg-2.1.1: move directory

git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/assenc.c

@@ -0,0 +1,132 @@
+/*
+ * SSA/ASS encoder
+ * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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 <string.h>
+
+#include "avcodec.h"
+#include "ass_split.h"
+#include "ass.h"
+#include "libavutil/avstring.h"
+#include "libavutil/internal.h"
+#include "libavutil/mem.h"
+
+typedef struct {
+    int id; ///< current event id, ReadOrder field
+} ASSEncodeContext;
+
+static av_cold int ass_encode_init(AVCodecContext *avctx)
+{
+    avctx->extradata = av_malloc(avctx->subtitle_header_size + 1);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+    memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
+    avctx->extradata_size = avctx->subtitle_header_size;
+    avctx->extradata[avctx->extradata_size] = 0;
+    return 0;
+}
+
+static int ass_encode_frame(AVCodecContext *avctx,
+                            unsigned char *buf, int bufsize,
+                            const AVSubtitle *sub)
+{
+    ASSEncodeContext *s = avctx->priv_data;
+    int i, len, total_len = 0;
+
+    for (i=0; i<sub->num_rects; i++) {
+        char ass_line[2048];
+        const char *ass = sub->rects[i]->ass;
+
+        if (sub->rects[i]->type != SUBTITLE_ASS) {
+            av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
+            return -1;
+        }
+
+        if (strncmp(ass, "Dialogue: ", 10)) {
+            av_log(avctx, AV_LOG_ERROR, "AVSubtitle rectangle ass \"%s\""
+                   " does not look like a SSA markup\n", ass);
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (avctx->codec->id == AV_CODEC_ID_ASS) {
+            long int layer;
+            char *p;
+
+            if (i > 0) {
+                av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one "
+                       "ASS rectangle field.\n");
+                return AVERROR_INVALIDDATA;
+            }
+
+            ass += 10; // skip "Dialogue: "
+            /* parse Layer field. If it's a Marked field, the content
+             * will be "Marked=N" instead of the layer num, so we will
+             * have layer=0, which is fine. */
+            layer = strtol(ass, &p, 10);
+
+#define SKIP_ENTRY(ptr) do {        \
+    char *sep = strchr(ptr, ',');   \
+    if (sep)                        \
+        ptr = sep + 1;              \
+} while (0)
+
+            SKIP_ENTRY(p); // skip layer or marked
+            SKIP_ENTRY(p); // skip start timestamp
+            SKIP_ENTRY(p); // skip end timestamp
+            snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p);
+            ass_line[strcspn(ass_line, "\r\n")] = 0;
+            ass = ass_line;
+        }
+        len = av_strlcpy(buf+total_len, ass, bufsize-total_len);
+
+        if (len > bufsize-total_len-1) {
+            av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
+            return -1;
+        }
+
+        total_len += len;
+    }
+
+    return total_len;
+}
+
+#if CONFIG_SSA_ENCODER
+AVCodec ff_ssa_encoder = {
+    .name         = "ssa",
+    .long_name    = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
+    .type         = AVMEDIA_TYPE_SUBTITLE,
+    .id           = AV_CODEC_ID_SSA,
+    .init         = ass_encode_init,
+    .encode_sub   = ass_encode_frame,
+    .priv_data_size = sizeof(ASSEncodeContext),
+};
+#endif
+
+#if CONFIG_ASS_ENCODER
+AVCodec ff_ass_encoder = {
+    .name         = "ass",
+    .long_name    = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
+    .type         = AVMEDIA_TYPE_SUBTITLE,
+    .id           = AV_CODEC_ID_ASS,
+    .init         = ass_encode_init,
+    .encode_sub   = ass_encode_frame,
+    .priv_data_size = sizeof(ASSEncodeContext),
+};
+#endif