early-access version 1432

externals/ffmpeg/libavcodec/movsub_bsf.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2008 Reimar Döffinger
+ *
+ * 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/common.h"
+#include "libavutil/intreadwrite.h"
+#include "bsf.h"
+#include "bsf_internal.h"
+
+static int text2movsub(AVBSFContext *ctx, AVPacket *out)
+{
+    AVPacket *in;
+    int ret = 0;
+
+    ret = ff_bsf_get_packet(ctx, &in);
+    if (ret < 0)
+        return ret;
+
+    if (in->size > 0xffff) {
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    ret = av_new_packet(out, in->size + 2);
+    if (ret < 0) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    ret = av_packet_copy_props(out, in);
+    if (ret < 0)
+        goto fail;
+
+    AV_WB16(out->data, in->size);
+    memcpy(out->data + 2, in->data, in->size);
+
+fail:
+    if (ret < 0)
+        av_packet_unref(out);
+    av_packet_free(&in);
+    return ret;
+}
+
+const AVBitStreamFilter ff_text2movsub_bsf = {
+    .name   = "text2movsub",
+    .filter = text2movsub,
+};
+
+static int mov2textsub(AVBSFContext *ctx, AVPacket *pkt)
+{
+    int ret = 0;
+
+    ret = ff_bsf_get_packet_ref(ctx, pkt);
+    if (ret < 0)
+        return ret;
+
+    if (pkt->size < 2) {
+       av_packet_unref(pkt);
+       return AVERROR_INVALIDDATA;
+    }
+
+    pkt->size  = FFMIN(pkt->size - 2, AV_RB16(pkt->data));
+    pkt->data += 2;
+
+    return 0;
+}
+
+const AVBitStreamFilter ff_mov2textsub_bsf = {
+    .name   = "mov2textsub",
+    .filter = mov2textsub,
+};