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-rw-r--r--libavcodec/ass_split.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/libavcodec/ass_split.c b/libavcodec/ass_split.c
new file mode 100644
index 0000000000..413e9c8d06
--- /dev/null
+++ b/libavcodec/ass_split.c
@@ -0,0 +1,476 @@
+/*
+ * 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 + (buf[len] == ','));
+ }
+ 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 += len;
+ if (!last && *buf) buf++;
+ buf = skip_space(buf);
+ }
+ }
+ } 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");
+ buf += !!*buf;
+ }
+ 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");
+ buf += !!*buf;
+ 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");
+ buf += !!*buf;
+ }
+ }
+ 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_freep(&(ctx->field_order[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 && *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 *ff_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;
+}