add SubRip encoder

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

1 files changed, 468 insertions, 0 deletions

diff --git a/libavcodec/ass_split.c b/libavcodec/ass_split.c
new file mode 100644
index 0000000..2a3b764
--- /dev/null
+++ b/libavcodec/ass_split.c
@@ -0,0 +1,468 @@
+/*
+ * 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
+ */
+
+#include "avcodec.h"
+#include "ass_split.h"
+
+typedef enum {
+    ASS_STR,
+    ASS_INT,
+    ASS_FLT,
+    ASS_COLOR,
+    ASS_TIMESTAMP,
+    ASS_ALGN,
+} ASSFieldType;
+
+typedef struct {
+    const char *name;
+    int type;
+    int offset;
+} ASSFields;
+
+typedef struct {
+    const char *section;
+    const char *format_header;
+    const char *fields_header;
+    int         size;
+    int         offset;
+    int         offset_count;
+    ASSFields   fields[10];
+} ASSSection;
+
+static const ASSSection ass_sections[] = {
+    { .section       = "Script Info",
+      .offset        = offsetof(ASS, script_info),
+      .fields = {{"ScriptType", ASS_STR, offsetof(ASSScriptInfo, script_type)},
+                 {"Collisions", ASS_STR, offsetof(ASSScriptInfo, collisions) },
+                 {"PlayResX",   ASS_INT, offsetof(ASSScriptInfo, play_res_x) },
+                 {"PlayResY",   ASS_INT, offsetof(ASSScriptInfo, play_res_y) },
+                 {"Timer",      ASS_FLT, offsetof(ASSScriptInfo, timer)      },
+                 {0},
+        }
+    },
+    { .section       = "V4+ Styles",
+      .format_header = "Format",
+      .fields_header = "Style",
+      .size          = sizeof(ASSStyle),
+      .offset        = offsetof(ASS, styles),
+      .offset_count  = offsetof(ASS, styles_count),
+      .fields = {{"Name",         ASS_STR,  offsetof(ASSStyle, name)         },
+                 {"Fontname",     ASS_STR,  offsetof(ASSStyle, font_name)    },
+                 {"Fontsize",     ASS_INT,  offsetof(ASSStyle, font_size)    },
+                 {"PrimaryColour",ASS_COLOR,offsetof(ASSStyle, primary_color)},
+                 {"BackColour",   ASS_COLOR,offsetof(ASSStyle, back_color)   },
+                 {"Bold",         ASS_INT,  offsetof(ASSStyle, bold)         },
+                 {"Italic",       ASS_INT,  offsetof(ASSStyle, italic)       },
+                 {"Underline",    ASS_INT,  offsetof(ASSStyle, underline)    },
+                 {"Alignment",    ASS_INT,  offsetof(ASSStyle, alignment)    },
+                 {0},
+        }
+    },
+    { .section       = "V4 Styles",
+      .format_header = "Format",
+      .fields_header = "Style",
+      .size          = sizeof(ASSStyle),
+      .offset        = offsetof(ASS, styles),
+      .offset_count  = offsetof(ASS, styles_count),
+      .fields = {{"Name",         ASS_STR,  offsetof(ASSStyle, name)         },
+                 {"Fontname",     ASS_STR,  offsetof(ASSStyle, font_name)    },
+                 {"Fontsize",     ASS_INT,  offsetof(ASSStyle, font_size)    },
+                 {"PrimaryColour",ASS_COLOR,offsetof(ASSStyle, primary_color)},
+                 {"BackColour",   ASS_COLOR,offsetof(ASSStyle, back_color)   },
+                 {"Bold",         ASS_INT,  offsetof(ASSStyle, bold)         },
+                 {"Italic",       ASS_INT,  offsetof(ASSStyle, italic)       },
+                 {"Alignment",    ASS_ALGN, offsetof(ASSStyle, alignment)    },
+                 {0},
+        }
+    },
+    { .section       = "Events",
+      .format_header = "Format",
+      .fields_header = "Dialogue",
+      .size          = sizeof(ASSDialog),
+      .offset        = offsetof(ASS, dialogs),
+      .offset_count  = offsetof(ASS, dialogs_count),
+      .fields = {{"Layer",  ASS_INT,        offsetof(ASSDialog, layer)       },
+                 {"Start",  ASS_TIMESTAMP,  offsetof(ASSDialog, start)       },
+                 {"End",    ASS_TIMESTAMP,  offsetof(ASSDialog, end)         },
+                 {"Style",  ASS_STR,        offsetof(ASSDialog, style)       },
+                 {"Text",   ASS_STR,        offsetof(ASSDialog, text)        },
+                 {0},
+        }
+    },
+};
+
+
+typedef int (*ASSConvertFunc)(void *dest, const char *buf, int len);
+
+static int convert_str(void *dest, const char *buf, int len)
+{
+    char *str = av_malloc(len + 1);
+    if (str) {
+        memcpy(str, buf, len);
+        str[len] = 0;
+        if (*(void **)dest)
+            av_free(*(void **)dest);
+        *(char **)dest = str;
+    }
+    return !str;
+}
+static int convert_int(void *dest, const char *buf, int len)
+{
+    return sscanf(buf, "%d", (int *)dest) == 1;
+}
+static int convert_flt(void *dest, const char *buf, int len)
+{
+    return sscanf(buf, "%f", (float *)dest) == 1;
+}
+static int convert_color(void *dest, const char *buf, int len)
+{
+    return sscanf(buf, "&H%8x", (int *)dest) == 1 ||
+           sscanf(buf, "%d",    (int *)dest) == 1;
+}
+static int convert_timestamp(void *dest, const char *buf, int len)
+{
+    int c, h, m, s, cs;
+    if ((c = sscanf(buf, "%d:%02d:%02d.%02d", &h, &m, &s, &cs)) == 4)
+        *(int *)dest = 360000*h + 6000*m + 100*s + cs;
+    return c == 4;
+}
+static int convert_alignment(void *dest, const char *buf, int len)
+{
+    int a;
+    if (sscanf(buf, "%d", &a) == 1) {
+        /* convert V4 Style alignment to V4+ Style */
+        *(int *)dest = a + ((a&4) >> 1) - 5*!!(a&8);
+        return 1;
+    }
+    return 0;
+}
+
+static const ASSConvertFunc convert_func[] = {
+    [ASS_STR]       = convert_str,
+    [ASS_INT]       = convert_int,
+    [ASS_FLT]       = convert_flt,
+    [ASS_COLOR]     = convert_color,
+    [ASS_TIMESTAMP] = convert_timestamp,
+    [ASS_ALGN]      = convert_alignment,
+};
+
+
+struct ASSSplitContext {
+    ASS ass;
+    int current_section;
+    int field_number[FF_ARRAY_ELEMS(ass_sections)];
+    int *field_order[FF_ARRAY_ELEMS(ass_sections)];
+};
+
+
+static uint8_t *realloc_section_array(ASSSplitContext *ctx)
+{
+    const ASSSection *section = &ass_sections[ctx->current_section];
+    int *count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
+    void **section_ptr = (void **)((uint8_t *)&ctx->ass + section->offset);
+    uint8_t *tmp = av_realloc(*section_ptr, (*count+1)*section->size);
+    if (!tmp)
+        return NULL;
+    *section_ptr = tmp;
+    tmp += *count * section->size;
+    memset(tmp, 0, section->size);
+    (*count)++;
+    return tmp;
+}
+
+static inline int is_eol(char buf)
+{
+    return buf == '\r' || buf == '\n' || buf == 0;
+}
+
+static inline const char *skip_space(const char *buf)
+{
+    while (*buf == ' ')
+        buf++;
+    return buf;
+}
+
+static const char *ass_split_section(ASSSplitContext *ctx, const char *buf)
+{
+    const ASSSection *section = &ass_sections[ctx->current_section];
+    int *number = &ctx->field_number[ctx->current_section];
+    int *order = ctx->field_order[ctx->current_section];
+    int *tmp, i, len;
+
+    while (buf && *buf) {
+        if (buf[0] == '[') {
+            ctx->current_section = -1;
+            break;
+        }
+        if (buf[0] == ';' || (buf[0] == '!' && buf[1] == ':')) {
+            /* skip comments */
+        } else if (section->format_header && !order) {
+            len = strlen(section->format_header);
+            if (strncmp(buf, section->format_header, len) || buf[len] != ':')
+                return NULL;
+            buf += len + 1;
+            while (!is_eol(*buf)) {
+                buf = skip_space(buf);
+                len = strcspn(buf, ", \r\n");
+                if (!(tmp = av_realloc(order, (*number + 1) * sizeof(*order))))
+                    return NULL;
+                order = tmp;
+                order[*number] = -1;
+                for (i=0; section->fields[i].name; i++)
+                    if (!strncmp(buf, section->fields[i].name, len)) {
+                        order[*number] = i;
+                        break;
+                    }
+                (*number)++;
+                buf = skip_space(buf + len + 1);
+            }
+            ctx->field_order[ctx->current_section] = order;
+        } else if (section->fields_header) {
+            len = strlen(section->fields_header);
+            if (!strncmp(buf, section->fields_header, len) && buf[len] == ':') {
+                uint8_t *ptr, *struct_ptr = realloc_section_array(ctx);
+                if (!struct_ptr)  return NULL;
+                buf += len + 1;
+                for (i=0; !is_eol(*buf) && i < *number; i++) {
+                    int last = i == *number - 1;
+                    buf = skip_space(buf);
+                    len = strcspn(buf, last ? "\r\n" : ",\r\n");
+                    if (order[i] >= 0) {
+                        ASSFieldType type = section->fields[order[i]].type;
+                        ptr = struct_ptr + section->fields[order[i]].offset;
+                        convert_func[type](ptr, buf, len);
+                    }
+                    buf = skip_space(buf + len + !last);
+                }
+            }
+        } else {
+            len = strcspn(buf, ":\r\n");
+            if (buf[len] == ':') {
+                for (i=0; section->fields[i].name; i++)
+                    if (!strncmp(buf, section->fields[i].name, len)) {
+                        ASSFieldType type = section->fields[i].type;
+                        uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
+                        ptr += section->fields[i].offset;
+                        buf = skip_space(buf + len + 1);
+                        convert_func[type](ptr, buf, strcspn(buf, "\r\n"));
+                        break;
+                    }
+            }
+        }
+        buf += strcspn(buf, "\n") + 1;
+    }
+    return buf;
+}
+
+static int ass_split(ASSSplitContext *ctx, const char *buf)
+{
+    char c, section[16];
+    int i;
+
+    if (ctx->current_section >= 0)
+        buf = ass_split_section(ctx, buf);
+
+    while (buf && *buf) {
+        if (sscanf(buf, "[%15[0-9A-Za-z+ ]]%c", section, &c) == 2) {
+            buf += strcspn(buf, "\n") + 1;
+            for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
+                if (!strcmp(section, ass_sections[i].section)) {
+                    ctx->current_section = i;
+                    buf = ass_split_section(ctx, buf);
+                }
+        } else
+            buf += strcspn(buf, "\n") + 1;
+    }
+    return buf ? 0 : AVERROR_INVALIDDATA;
+}
+
+ASSSplitContext *ff_ass_split(const char *buf)
+{
+    ASSSplitContext *ctx = av_mallocz(sizeof(*ctx));
+    ctx->current_section = -1;
+    if (ass_split(ctx, buf) < 0) {
+        ff_ass_split_free(ctx);
+        return NULL;
+    }
+    return ctx;
+}
+
+static void free_section(ASSSplitContext *ctx, const ASSSection *section)
+{
+    uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
+    int i, j, *count, c = 1;
+
+    if (section->format_header) {
+        ptr   = *(void **)ptr;
+        count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
+    } else
+        count = &c;
+
+    if (ptr)
+        for (i=0; i<*count; i++, ptr += section->size)
+            for (j=0; section->fields[j].name; j++) {
+                const ASSFields *field = &section->fields[j];
+                if (field->type == ASS_STR)
+                    av_freep(ptr + field->offset);
+            }
+    *count = 0;
+
+    if (section->format_header)
+        av_freep((uint8_t *)&ctx->ass + section->offset);
+}
+
+ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf,
+                               int cache, int *number)
+{
+    ASSDialog *dialog = NULL;
+    int i, count;
+    if (!cache)
+        for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
+            if (!strcmp(ass_sections[i].section, "Events")) {
+                free_section(ctx, &ass_sections[i]);
+                break;
+            }
+    count = ctx->ass.dialogs_count;
+    if (ass_split(ctx, buf) == 0)
+        dialog = ctx->ass.dialogs + count;
+    if (number)
+        *number = ctx->ass.dialogs_count - count;
+    return dialog;
+}
+
+void ff_ass_split_free(ASSSplitContext *ctx)
+{
+    if (ctx) {
+        int i;
+        for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
+            free_section(ctx, &ass_sections[i]);
+        av_free(ctx);
+    }
+}
+
+
+int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv,
+                                const char *buf)
+{
+    const char *text = NULL;
+    char new_line[2];
+    int text_len = 0;
+
+    while (*buf) {
+        if (text && callbacks->text &&
+            (sscanf(buf, "\\%1[nN]", new_line) == 1 ||
+             !strncmp(buf, "{\\", 2))) {
+            callbacks->text(priv, text, text_len);
+            text = NULL;
+        }
+        if (sscanf(buf, "\\%1[nN]", new_line) == 1) {
+            if (callbacks->new_line)
+                callbacks->new_line(priv, new_line[0] == 'N');
+            buf += 2;
+        } else if (!strncmp(buf, "{\\", 2)) {
+            buf++;
+            while (*buf == '\\') {
+                char style[2], c[2], sep[2], c_num[2] = "0", tmp[128] = {0};
+                unsigned int color = 0xFFFFFFFF;
+                int len, size = -1, an = -1, alpha = -1;
+                int x1, y1, x2, y2, t1 = -1, t2 = -1;
+                if (sscanf(buf, "\\%1[bisu]%1[01\\}]%n", style, c, &len) > 1) {
+                    int close = c[0] == '0' ? 1 : c[0] == '1' ? 0 : -1;
+                    len += close != -1;
+                    if (callbacks->style)
+                        callbacks->style(priv, style[0], close);
+                } else if (sscanf(buf, "\\c%1[\\}]%n", sep, &len) > 0 ||
+                           sscanf(buf, "\\c&H%X&%1[\\}]%n", &color, sep, &len) > 1 ||
+                           sscanf(buf, "\\%1[1234]c%1[\\}]%n", c_num, sep, &len) > 1 ||
+                           sscanf(buf, "\\%1[1234]c&H%X&%1[\\}]%n", c_num, &color, sep, &len) > 2) {
+                    if (callbacks->color)
+                        callbacks->color(priv, color, c_num[0] - '0');
+                } else if (sscanf(buf, "\\alpha%1[\\}]%n", sep, &len) > 0 ||
+                           sscanf(buf, "\\alpha&H%2X&%1[\\}]%n", &alpha, sep, &len) > 1 ||
+                           sscanf(buf, "\\%1[1234]a%1[\\}]%n", c_num, sep, &len) > 1 ||
+                           sscanf(buf, "\\%1[1234]a&H%2X&%1[\\}]%n", c_num, &alpha, sep, &len) > 2) {
+                    if (callbacks->alpha)
+                        callbacks->alpha(priv, alpha, c_num[0] - '0');
+                } else if (sscanf(buf, "\\fn%1[\\}]%n", sep, &len) > 0 ||
+                           sscanf(buf, "\\fn%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) {
+                    if (callbacks->font_name)
+                        callbacks->font_name(priv, tmp[0] ? tmp : NULL);
+                } else if (sscanf(buf, "\\fs%1[\\}]%n", sep, &len) > 0 ||
+                           sscanf(buf, "\\fs%u%1[\\}]%n", &size, sep, &len) > 1) {
+                    if (callbacks->font_size)
+                        callbacks->font_size(priv, size);
+                } else if (sscanf(buf, "\\a%1[\\}]%n", sep, &len) > 0 ||
+                           sscanf(buf, "\\a%2u%1[\\}]%n", &an, sep, &len) > 1 ||
+                           sscanf(buf, "\\an%1[\\}]%n", sep, &len) > 0 ||
+                           sscanf(buf, "\\an%1u%1[\\}]%n", &an, sep, &len) > 1) {
+                    if (an != -1 && buf[2] != 'n')
+                        an = (an&3) + (an&4 ? 6 : an&8 ? 3 : 0);
+                    if (callbacks->alignment)
+                        callbacks->alignment(priv, an);
+                } else if (sscanf(buf, "\\r%1[\\}]%n", sep, &len) > 0 ||
+                           sscanf(buf, "\\r%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) {
+                    if (callbacks->cancel_overrides)
+                        callbacks->cancel_overrides(priv, tmp);
+                } else if (sscanf(buf, "\\move(%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, sep, &len) > 4 ||
+                           sscanf(buf, "\\move(%d,%d,%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, &t1, &t2, sep, &len) > 6) {
+                    if (callbacks->move)
+                        callbacks->move(priv, x1, y1, x2, y2, t1, t2);
+                } else if (sscanf(buf, "\\pos(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) {
+                    if (callbacks->move)
+                        callbacks->move(priv, x1, y1, x1, y1, -1, -1);
+                } else if (sscanf(buf, "\\org(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) {
+                    if (callbacks->origin)
+                        callbacks->origin(priv, x1, y1);
+                } else {
+                    len = strcspn(buf+1, "\\}") + 2;  /* skip unknown code */
+                }
+                buf += len - 1;
+            }
+            if (*buf++ != '}')
+                return AVERROR_INVALIDDATA;
+        } else {
+            if (!text) {
+                text = buf;
+                text_len = 1;
+            } else
+                text_len++;
+            buf++;
+        }
+    }
+    if (text && callbacks->text)
+        callbacks->text(priv, text, text_len);
+    if (callbacks->end)
+        callbacks->end(priv);
+    return 0;
+}
+
+ASSStyle *ass_style_get(ASSSplitContext *ctx, const char *style)
+{
+    ASS *ass = &ctx->ass;
+    int i;
+
+    if (!style || !*style)
+        style = "Default";
+    for (i=0; i<ass->styles_count; i++)
+        if (!strcmp(ass->styles[i].name, style))
+            return ass->styles + i;
+    return NULL;
+}