add SubRip encoder

Signed-off-by: Aurelien Jacobs <aurel@gnuage.org>

1 files changed, 172 insertions, 0 deletions

diff --git a/libavcodec/ass_split.h b/libavcodec/ass_split.h
new file mode 100644
index 0000000000..66b452b7d4
--- /dev/null
+++ b/libavcodec/ass_split.h
@@ -0,0 +1,172 @@
+/*
+ * SSA/ASS spliting functions
+ * 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
+ */
+
+#ifndef AVCODEC_ASS_SPLIT_H
+#define AVCODEC_ASS_SPLIT_H
+
+/**
+ * fields extracted from the [Script Info] section
+ */
+typedef struct {
+    char *script_type;    /**< SSA script format version (eg. v4.00) */
+    char *collisions;     /**< how subtitles are moved to prevent collisions */
+    int   play_res_x;     /**< video width that ASS coords are referring to */
+    int   play_res_y;     /**< video height that ASS coords are referring to */
+    float timer;          /**< time multiplier to apply to SSA clock (in %) */
+} ASSScriptInfo;
+
+/**
+ * fields extracted from the [V4(+) Styles] section
+ */
+typedef struct {
+    char *name;           /**< name of the tyle (case sensitive) */
+    char *font_name;      /**< font face (case sensitive) */
+    int   font_size;      /**< font height */
+    int   primary_color;  /**< color that a subtitle will normally appear in */
+    int   back_color;     /**< color of the subtitle outline or shadow */
+    int   bold;           /**< whether text is bold (1) or not (0) */
+    int   italic;         /**< whether text is italic (1) or not (0) */
+    int   underline;      /**< whether text is underlined (1) or not (0) */
+    int   alignment;      /**< position of the text (left, center, top...),
+                               defined after the layout of the numpad
+                               (1-3 sub, 4-6 mid, 7-9 top) */
+} ASSStyle;
+
+/**
+ * fields extracted from the [Events] section
+ */
+typedef struct {
+    int   layer;    /**< higher numbered layers are drawn over lower numbered */
+    int   start;    /**< start time of the dialog in centiseconds */
+    int   end;      /**< end time of the dialog in centiseconds */
+    char *style;    /**< name of the ASSStyle to use with this dialog */
+    char *text;     /**< actual text which will be displayed as a subtitle,
+                         can include style override control codes (see
+                         ff_ass_split_override_codes()) */
+} ASSDialog;
+
+/**
+ * structure containing the whole split ASS data
+ */
+typedef struct {
+    ASSScriptInfo script_info;   /**< general information about the SSA script*/
+    ASSStyle     *styles;        /**< array of split out styles */
+    int           styles_count;  /**< number of ASSStyle in the styles array */
+    ASSDialog    *dialogs;       /**< array of split out dialogs */
+    int           dialogs_count; /**< number of ASSDialog in the dialogs array*/
+} ASS;
+
+/**
+ * This struct can be casted to ASS to access to the split data.
+ */
+typedef struct ASSSplitContext ASSSplitContext;
+
+/**
+ * Split a full ASS file or a ASS header from a string buffer and store
+ * the split structure in a newly allocated context.
+ *
+ * @param buf String containing the ASS formated data.
+ * @return Newly allocated struct containing split data.
+ */
+ASSSplitContext *ff_ass_split(const char *buf);
+
+/**
+ * Split one or several ASS "Dialogue" lines from a string buffer and store
+ * them in a already initialized context.
+ *
+ * @param ctx Context previously initialized by ff_ass_split().
+ * @param buf String containing the ASS "Dialogue" lines.
+ * @param cache Set to 1 to keep all the previously split ASSDialog in
+ *              the context, or set to 0 to free all the previously split
+ *              ASSDialog.
+ * @param number If not NULL, the pointed integer will be set to the number
+ *               of split ASSDialog.
+ * @return Pointer to the first split ASSDialog.
+ */
+ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf,
+                               int cache, int *number);
+
+/**
+ * Free all the memory allocated for an ASSSplitContext.
+ *
+ * @param ctx Context previously initialized by ff_ass_split().
+ */
+void ff_ass_split_free(ASSSplitContext *ctx);
+
+
+/**
+ * Set of callback functions corresponding to each override codes that can
+ * be encountered in a "Dialogue" Text field.
+ */
+typedef struct {
+    /**
+     * @defgroup ass_styles    ASS styles
+     * @{
+     */
+    void (*text)(void *priv, const char *text, int len);
+    void (*new_line)(void *priv, int forced);
+    void (*style)(void *priv, char style, int close);
+    void (*color)(void *priv, unsigned int color, unsigned int color_id);
+    void (*alpha)(void *priv, int alpha, int alpha_id);
+    void (*font_name)(void *priv, const char *name);
+    void (*font_size)(void *priv, int size);
+    void (*alignment)(void *priv, int alignment);
+    void (*cancel_overrides)(void *priv, const char *style);
+    /**< @} */
+
+    /**
+     * @defgroup ass_functions    ASS functions
+     * @{
+     */
+    void (*move)(void *priv, int x1, int y1, int x2, int y2, int t1, int t2);
+    void (*origin)(void *priv, int x, int y);
+    /**< @} */
+
+    /**
+     * @defgroup ass_end    end of Dialogue Event
+     * @{
+     */
+    void (*end)(void *priv);
+    /**< @} */
+} ASSCodesCallbacks;
+
+/**
+ * Split override codes out of a ASS "Dialogue" Text field.
+ *
+ * @param callbacks Set of callback functions called for each override code
+ *                  encountered.
+ * @param priv Opaque pointer passed to the callback functions.
+ * @param buf The ASS "Dialogue" Text field to split.
+ * @return >= 0 on success otherwise an error code <0
+ */
+int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv,
+                                const char *buf);
+
+/**
+ * Find an ASSStyle structure by its name.
+ *
+ * @param ctx Context previously initialized by ff_ass_split().
+ * @param style name of the style to search for.
+ * @return the ASSStyle corresponding to style, or NULL if style can't be found
+ */
+ASSStyle *ass_style_get(ASSSplitContext *ctx, const char *style);
+
+#endif /* AVCODEC_ASS_SPLIT_H */