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/movtextenc.c

@@ -0,0 +1,165 @@
+/*
+ * 3GPP TS 26.245 Timed Text encoder
+ * Copyright (c) 2012  Philip Langdale <philipl@overt.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 <stdarg.h>
+#include "avcodec.h"
+#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "ass_split.h"
+#include "ass.h"
+
+typedef struct {
+    ASSSplitContext *ass_ctx;
+    char buffer[2048];
+    char *ptr;
+    char *end;
+} MovTextContext;
+
+
+static av_cold int mov_text_encode_init(AVCodecContext *avctx)
+{
+    /*
+     * For now, we'll use a fixed default style. When we add styling
+     * support, this will be generated from the ASS style.
+     */
+    static uint8_t text_sample_entry[] = {
+        0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags
+        0x01,                   // int8_t horizontal-justification
+        0xFF,                   // int8_t vertical-justification
+        0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
+        // BoxRecord {
+        0x00, 0x00,             // int16_t top
+        0x00, 0x00,             // int16_t left
+        0x00, 0x00,             // int16_t bottom
+        0x00, 0x00,             // int16_t right
+        // };
+        // StyleRecord {
+        0x00, 0x00,             // uint16_t startChar
+        0x00, 0x00,             // uint16_t endChar
+        0x00, 0x01,             // uint16_t font-ID
+        0x00,                   // uint8_t face-style-flags
+        0x12,                   // uint8_t font-size
+        0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
+        // };
+        // FontTableBox {
+        0x00, 0x00, 0x00, 0x12, // uint32_t size
+        'f', 't', 'a', 'b',     // uint8_t name[4]
+        0x00, 0x01,             // uint16_t entry-count
+        // FontRecord {
+        0x00, 0x01,             // uint16_t font-ID
+        0x05,                   // uint8_t font-name-length
+        'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
+        // };
+        // };
+    };
+
+    MovTextContext *s = avctx->priv_data;
+
+    avctx->extradata_size = sizeof text_sample_entry;
+    avctx->extradata = av_mallocz(avctx->extradata_size);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+
+    memcpy(avctx->extradata, text_sample_entry, avctx->extradata_size);
+
+    s->ass_ctx = ff_ass_split(avctx->subtitle_header);
+    return s->ass_ctx ? 0 : AVERROR_INVALIDDATA;
+}
+
+static void mov_text_text_cb(void *priv, const char *text, int len)
+{
+    MovTextContext *s = priv;
+    av_assert0(s->end >= s->ptr);
+    av_strlcpy(s->ptr, text, FFMIN(s->end - s->ptr, len + 1));
+    s->ptr += FFMIN(s->end - s->ptr, len);
+}
+
+static void mov_text_new_line_cb(void *priv, int forced)
+{
+    MovTextContext *s = priv;
+    av_assert0(s->end >= s->ptr);
+    av_strlcpy(s->ptr, "\n", FFMIN(s->end - s->ptr, 2));
+    if (s->end > s->ptr)
+        s->ptr++;
+}
+
+static const ASSCodesCallbacks mov_text_callbacks = {
+    .text     = mov_text_text_cb,
+    .new_line = mov_text_new_line_cb,
+};
+
+static int mov_text_encode_frame(AVCodecContext *avctx, unsigned char *buf,
+                                 int bufsize, const AVSubtitle *sub)
+{
+    MovTextContext *s = avctx->priv_data;
+    ASSDialog *dialog;
+    int i, len, num;
+
+    s->ptr = s->buffer;
+    s->end = s->ptr + sizeof(s->buffer);
+
+    for (i = 0; i < sub->num_rects; i++) {
+
+        if (sub->rects[i]->type != SUBTITLE_ASS) {
+            av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
+            return AVERROR(ENOSYS);
+        }
+
+        dialog = ff_ass_split_dialog(s->ass_ctx, sub->rects[i]->ass, 0, &num);
+        for (; dialog && num--; dialog++) {
+            ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text);
+        }
+    }
+
+    if (s->ptr == s->buffer)
+        return 0;
+
+    AV_WB16(buf, strlen(s->buffer));
+    buf += 2;
+
+    len = av_strlcpy(buf, s->buffer, bufsize - 2);
+
+    if (len > bufsize-3) {
+        av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
+        return AVERROR(EINVAL);
+    }
+
+    return len + 2;
+}
+
+static int mov_text_encode_close(AVCodecContext *avctx)
+{
+    MovTextContext *s = avctx->priv_data;
+    ff_ass_split_free(s->ass_ctx);
+    return 0;
+}
+
+AVCodec ff_movtext_encoder = {
+    .name           = "mov_text",
+    .long_name      = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
+    .type           = AVMEDIA_TYPE_SUBTITLE,
+    .id             = AV_CODEC_ID_MOV_TEXT,
+    .priv_data_size = sizeof(MovTextContext),
+    .init           = mov_text_encode_init,
+    .encode_sub     = mov_text_encode_frame,
+    .close          = mov_text_encode_close,
+};