#include "config.h"
#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
#include "libavutil/common.h"
#include "libavutil/file.h"
#include "libavutil/eval.h"
#include "internal.h"
#include "video.h"
-#undef time
-
#include <ft2build.h>
#include <freetype/config/ftheader.h>
#include FT_FREETYPE_H
VAR_VARS_NB
};
+enum expansion_mode {
+ EXP_NONE,
+ EXP_NORMAL,
+ EXP_STRFTIME,
+};
+
typedef struct {
const AVClass *class;
+ enum expansion_mode exp_mode; ///< expansion mode to use for the text
int reinit; ///< tells if the filter is being reinited
uint8_t *fontfile; ///< font to be used
uint8_t *text; ///< text to be drawn
- uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
- size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
+ AVBPrint expanded_text; ///< used to contain the expanded text
int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
FT_Vector *positions; ///< positions for each element in the text
size_t nb_positions; ///< number of elements of positions array
AVTimecode tc; ///< timecode context
int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
int frame_id;
+ int reload; ///< reload text file for each frame
} DrawTextContext;
#define OFFSET(x) offsetof(DrawTextContext, x)
{"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
{"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
{"draw", "if false do not draw", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS},
+
+{"expansion","set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_STRFTIME}, 0, 2, FLAGS, "expansion"},
+{"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
+{"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
+{"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
+
{"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
{"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
{"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
+{"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
{"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
/* FT_LOAD_* flags */
return err;
}
+static int load_textfile(AVFilterContext *ctx)
+{
+ DrawTextContext *dtext = ctx->priv;
+ int err;
+ uint8_t *textbuf;
+ size_t textbuf_size;
+
+ if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
+ av_log(ctx, AV_LOG_ERROR,
+ "The text file '%s' could not be read or is empty\n",
+ dtext->textfile);
+ return err;
+ }
+
+ if (!(dtext->text = av_realloc(dtext->text, textbuf_size + 1)))
+ return AVERROR(ENOMEM);
+ memcpy(dtext->text, textbuf, textbuf_size);
+ dtext->text[textbuf_size] = 0;
+ av_file_unmap(textbuf, textbuf_size);
+
+ return 0;
+}
+
static av_cold int init(AVFilterContext *ctx, const char *args)
{
int err;
}
if (dtext->textfile) {
- uint8_t *textbuf;
- size_t textbuf_size;
-
if (dtext->text) {
av_log(ctx, AV_LOG_ERROR,
"Both text and text file provided. Please provide only one\n");
return AVERROR(EINVAL);
}
- if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
- av_log(ctx, AV_LOG_ERROR,
- "The text file '%s' could not be read or is empty\n",
- dtext->textfile);
+ if ((err = load_textfile(ctx)) < 0)
return err;
- }
-
- if (!(dtext->text = av_malloc(textbuf_size+1)))
- return AVERROR(ENOMEM);
- memcpy(dtext->text, textbuf, textbuf_size);
- dtext->text[textbuf_size] = 0;
- av_file_unmap(textbuf, textbuf_size);
}
+ if (dtext->reload && !dtext->textfile)
+ av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
+
if (dtext->tc_opt_string) {
int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,
dtext->tc_opt_string, ctx);
}
dtext->tabsize *= glyph->advance;
+ if (dtext->exp_mode == EXP_STRFTIME &&
+ (strchr(dtext->text, '%') || strchr(dtext->text, '\\')))
+ av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
+
+ av_bprint_init(&dtext->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
+
return 0;
}
FT_Done_Face(dtext->face);
FT_Done_FreeType(dtext->library);
+
+ av_bprint_finalize(&dtext->expanded_text, NULL);
}
static inline int is_newline(uint32_t c)
return AVERROR(ENOSYS);
}
+static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
+ char *fct, unsigned argc, char **argv, int tag)
+{
+ DrawTextContext *dtext = ctx->priv;
+
+ av_bprintf(bp, "%.6f", dtext->var_values[VAR_T]);
+ return 0;
+}
+
+static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
+ char *fct, unsigned argc, char **argv, int tag)
+{
+ DrawTextContext *dtext = ctx->priv;
+
+ av_bprintf(bp, "%d", (int)dtext->var_values[VAR_N]);
+ return 0;
+}
+
+#if !HAVE_LOCALTIME_R
+static void localtime_r(const time_t *t, struct tm *tm)
+{
+ *tm = *localtime(t);
+}
+#endif
+
+static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
+ char *fct, unsigned argc, char **argv, int tag)
+{
+ const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
+ time_t now;
+ struct tm tm;
+
+ time(&now);
+ if (tag == 'L')
+ localtime_r(&now, &tm);
+ else
+ tm = *gmtime(&now);
+ av_bprint_strftime(bp, fmt, &tm);
+ return 0;
+}
+
+static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
+ char *fct, unsigned argc, char **argv, int tag)
+{
+ DrawTextContext *dtext = ctx->priv;
+ double res;
+ int ret;
+
+ ret = av_expr_parse_and_eval(&res, argv[0], var_names, dtext->var_values,
+ NULL, NULL, fun2_names, fun2,
+ &dtext->prng, 0, ctx);
+ if (ret < 0)
+ av_log(ctx, AV_LOG_ERROR,
+ "Expression '%s' for the expr text expansion function is not valid\n",
+ argv[0]);
+ else
+ av_bprintf(bp, "%f", res);
+
+ return ret;
+}
+
+static const struct drawtext_function {
+ const char *name;
+ unsigned argc_min, argc_max;
+ int tag; /** opaque argument to func */
+ int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
+} functions[] = {
+ { "expr", 1, 1, 0, func_eval_expr },
+ { "e", 1, 1, 0, func_eval_expr },
+ { "pts", 0, 0, 0, func_pts },
+ { "gmtime", 0, 1, 'G', func_strftime },
+ { "localtime", 0, 1, 'L', func_strftime },
+ { "frame_num", 0, 0, 0, func_frame_num },
+ { "n", 0, 0, 0, func_frame_num },
+};
+
+static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
+ unsigned argc, char **argv)
+{
+ unsigned i;
+
+ for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
+ if (strcmp(fct, functions[i].name))
+ continue;
+ if (argc < functions[i].argc_min) {
+ av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
+ fct, functions[i].argc_min);
+ return AVERROR(EINVAL);
+ }
+ if (argc > functions[i].argc_max) {
+ av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
+ fct, functions[i].argc_max);
+ return AVERROR(EINVAL);
+ }
+ break;
+ }
+ if (i >= FF_ARRAY_ELEMS(functions)) {
+ av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
+ return AVERROR(EINVAL);
+ }
+ return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
+}
+
+static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
+{
+ const char *text = *rtext;
+ char *argv[16] = { NULL };
+ unsigned argc = 0, i;
+ int ret;
+
+ if (*text != '{') {
+ av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
+ return AVERROR(EINVAL);
+ }
+ text++;
+ while (1) {
+ if (!(argv[argc++] = av_get_token(&text, ":}"))) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ if (!*text) {
+ av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
+ ret = AVERROR(EINVAL);
+ goto end;
+ }
+ if (argc == FF_ARRAY_ELEMS(argv))
+ av_freep(&argv[--argc]); /* error will be caught later */
+ if (*text == '}')
+ break;
+ text++;
+ }
+
+ if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
+ goto end;
+ ret = 0;
+ *rtext = (char *)text + 1;
+
+end:
+ for (i = 0; i < argc; i++)
+ av_freep(&argv[i]);
+ return ret;
+}
+
+static int expand_text(AVFilterContext *ctx)
+{
+ DrawTextContext *dtext = ctx->priv;
+ char *text = dtext->text;
+ AVBPrint *bp = &dtext->expanded_text;
+ int ret;
+
+ av_bprint_clear(bp);
+ while (*text) {
+ if (*text == '\\' && text[1]) {
+ av_bprint_chars(bp, text[1], 1);
+ text += 2;
+ } else if (*text == '%') {
+ text++;
+ if ((ret = expand_function(ctx, bp, &text)) < 0)
+ return ret;
+ } else {
+ av_bprint_chars(bp, *text, 1);
+ text++;
+ }
+ }
+ if (!av_bprint_is_complete(bp))
+ return AVERROR(ENOMEM);
+ return 0;
+}
+
static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
{
- char *text = dtext->expanded_text;
+ char *text = dtext->expanded_text.str;
uint32_t code = 0;
int i, x1, y1;
uint8_t *p;
time_t now = time(0);
struct tm ltime;
- uint8_t *buf = dtext->expanded_text;
- int buf_size = dtext->expanded_text_size;
+ AVBPrint *bp = &dtext->expanded_text;
+
+ av_bprint_clear(bp);
if(dtext->basetime != AV_NOPTS_VALUE)
now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
- if (!buf) {
- buf_size = 2*strlen(dtext->text)+1;
- buf = av_malloc(buf_size);
+ switch (dtext->exp_mode) {
+ case EXP_NONE:
+ av_bprintf(bp, "%s", dtext->text);
+ break;
+ case EXP_NORMAL:
+ if ((ret = expand_text(ctx)) < 0)
+ return ret;
+ break;
+ case EXP_STRFTIME:
+ localtime_r(&now, <ime);
+ av_bprint_strftime(bp, dtext->text, <ime);
+ break;
}
-#if HAVE_LOCALTIME_R
- localtime_r(&now, <ime);
-#else
- if(strchr(dtext->text, '%'))
- ltime= *localtime(&now);
-#endif
-
- do {
- *buf = 1;
- if (strftime(buf, buf_size, dtext->text, <ime) != 0 || *buf == 0)
- break;
- buf_size *= 2;
- } while ((buf = av_realloc(buf, buf_size)));
-
if (dtext->tc_opt_string) {
char tcbuf[AV_TIMECODE_STR_SIZE];
av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);
- av_free(buf);
- buf = av_asprintf("%s%s", dtext->text, tcbuf);
+ av_bprint_clear(bp);
+ av_bprintf(bp, "%s%s", dtext->text, tcbuf);
}
- if (!buf)
+ if (!av_bprint_is_complete(bp))
return AVERROR(ENOMEM);
- text = dtext->expanded_text = buf;
- dtext->expanded_text_size = buf_size;
- if ((len = strlen(text)) > dtext->nb_positions) {
+ text = dtext->expanded_text.str;
+ if ((len = dtext->expanded_text.len) > dtext->nb_positions) {
if (!(dtext->positions =
av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
return AVERROR(ENOMEM);
return 0;
}
-static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
-{
- return 0;
-}
-
-static int end_frame(AVFilterLink *inlink)
+static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
DrawTextContext *dtext = ctx->priv;
- AVFilterBufferRef *picref = inlink->cur_buf;
int ret;
- dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
- NAN : picref->pts * av_q2d(inlink->time_base);
+ if (dtext->reload)
+ if ((ret = load_textfile(ctx)) < 0)
+ return ret;
+
+ dtext->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
+ NAN : frame->pts * av_q2d(inlink->time_base);
- draw_text(ctx, picref, picref->video->w, picref->video->h);
+ draw_text(ctx, frame, frame->video->w, frame->video->h);
av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
(int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
dtext->var_values[VAR_N] += 1.0;
- if ((ret = ff_draw_slice(outlink, 0, picref->video->h, 1)) < 0 ||
- (ret = ff_end_frame(outlink)) < 0)
- return ret;
- return 0;
+ return ff_filter_frame(outlink, frame);
}
static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = ff_null_get_video_buffer,
- .start_frame = ff_null_start_frame,
- .draw_slice = null_draw_slice,
- .end_frame = end_frame,
+ .filter_frame = filter_frame,
.config_props = config_input,
.min_perms = AV_PERM_WRITE |
AV_PERM_READ,
projects / ffmpeg / blobdiff