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vf_drawtext.c
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/*
* Copyright (c) 2011 Stefano Sabatini
* Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
* Copyright (c) 2003 Gustavo Sverzut Barbieri <[email protected]>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* drawtext filter, based on the original vhook/drawtext.c
* filter by Gustavo Sverzut Barbieri
*/
#include "config.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#if CONFIG_LIBFONTCONFIG
#include <fontconfig/fontconfig.h>
#endif
#include "libavutil/colorspace.h"
#include "libavutil/common.h"
#include "libavutil/file.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/mathematics.h"
#include "libavutil/random_seed.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/time_internal.h"
#include "libavutil/tree.h"
#include "libavutil/lfg.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
static const char *const var_names[] = {
"E",
"PHI",
"PI",
"main_w", "W", ///< width of the main video
"main_h", "H", ///< height of the main video
"text_w", "w", ///< width of the overlay text
"text_h", "h", ///< height of the overlay text
"x",
"y",
"n", ///< number of processed frames
"t", ///< timestamp expressed in seconds
NULL
};
static const char *const fun2_names[] = {
"rand"
};
static double drand(void *opaque, double min, double max)
{
return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
}
typedef double (*eval_func2)(void *, double a, double b);
static const eval_func2 fun2[] = {
drand,
NULL
};
enum var_name {
VAR_E,
VAR_PHI,
VAR_PI,
VAR_MAIN_W, VAR_MW,
VAR_MAIN_H, VAR_MH,
VAR_TEXT_W, VAR_TW,
VAR_TEXT_H, VAR_TH,
VAR_X,
VAR_Y,
VAR_N,
VAR_T,
VAR_VARS_NB
};
typedef struct DrawTextContext {
const AVClass *class;
#if CONFIG_LIBFONTCONFIG
uint8_t *font; ///< font to be used
#endif
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
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
char *textfile; ///< file with text to be drawn
int x, y; ///< position to start drawing text
int w, h; ///< dimension of the text block
int shadowx, shadowy;
unsigned int fontsize; ///< font size to use
char *fontcolor_string; ///< font color as string
char *boxcolor_string; ///< box color as string
char *shadowcolor_string; ///< shadow color as string
uint8_t fontcolor[4]; ///< foreground color
uint8_t boxcolor[4]; ///< background color
uint8_t shadowcolor[4]; ///< shadow color
uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
uint8_t boxcolor_rgba[4]; ///< background color in RGBA
uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
short int draw_box; ///< draw box around text - true or false
int use_kerning; ///< font kerning is used - true/false
int tabsize; ///< tab size
int fix_bounds; ///< do we let it go out of frame bounds - t/f
FT_Library library; ///< freetype font library handle
FT_Face face; ///< freetype font face handle
struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
int hsub, vsub; ///< chroma subsampling values
int is_packed_rgb;
int pixel_step[4]; ///< distance in bytes between the component of each pixel
uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
uint8_t *box_line[4]; ///< line used for filling the box background
char *x_expr, *y_expr;
AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
double var_values[VAR_VARS_NB];
char *d_expr;
AVExpr *d_pexpr;
int draw; ///< set to zero to prevent drawing
char *a_expr;
AVExpr *a_pexpr;
int alpha;
AVLFG prng; ///< random
} DrawTextContext;
#define OFFSET(x) offsetof(DrawTextContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static const AVOption drawtext_options[]= {
#if CONFIG_LIBFONTCONFIG
{ "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
#endif
{ "fontfile", NULL, OFFSET(fontfile), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "text", NULL, OFFSET(text), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "textfile", NULL, OFFSET(textfile), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "fontcolor", NULL, OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
{ "boxcolor", NULL, OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, { .str = "white" }, .flags = FLAGS },
{ "shadowcolor", NULL, OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
{ "box", NULL, OFFSET(draw_box), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
{ "fontsize", NULL, OFFSET(fontsize), AV_OPT_TYPE_INT, { .i64 = 16 }, 1, 1024, FLAGS },
{ "x", NULL, OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "y", NULL, OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "shadowx", NULL, OFFSET(shadowx), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ "shadowy", NULL, OFFSET(shadowy), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ "tabsize", NULL, OFFSET(tabsize), AV_OPT_TYPE_INT, { .i64 = 4 }, 0, INT_MAX, FLAGS },
{ "draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
{ "alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = 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 */
{ "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT | FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags" },
{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ NULL},
};
static const char *drawtext_get_name(void *ctx)
{
return "drawtext";
}
static const AVClass drawtext_class = {
"DrawTextContext",
drawtext_get_name,
drawtext_options
};
#undef __FTERRORS_H__
#define FT_ERROR_START_LIST {
#define FT_ERRORDEF(e, v, s) { (e), (s) },
#define FT_ERROR_END_LIST { 0, NULL } };
static struct ft_error {
int err;
const char *err_msg;
} ft_errors[] =
#include FT_ERRORS_H
#define FT_ERRMSG(e) ft_errors[e].err_msg
typedef struct Glyph {
FT_Glyph *glyph;
uint32_t code;
FT_Bitmap bitmap; ///< array holding bitmaps of font
FT_BBox bbox;
int advance;
int bitmap_left;
int bitmap_top;
} Glyph;
static int glyph_cmp(void *key, const void *b)
{
const Glyph *a = key, *bb = b;
int64_t diff = (int64_t)a->code - (int64_t)bb->code;
return diff > 0 ? 1 : diff < 0 ? -1 : 0;
}
/**
* Load glyphs corresponding to the UTF-32 codepoint code.
*/
static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
{
DrawTextContext *s = ctx->priv;
Glyph *glyph;
struct AVTreeNode *node = NULL;
int ret;
/* load glyph into s->face->glyph */
if (FT_Load_Char(s->face, code, s->ft_load_flags))
return AVERROR(EINVAL);
/* save glyph */
if (!(glyph = av_mallocz(sizeof(*glyph))) ||
!(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
ret = AVERROR(ENOMEM);
goto error;
}
glyph->code = code;
if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {
ret = AVERROR(EINVAL);
goto error;
}
glyph->bitmap = s->face->glyph->bitmap;
glyph->bitmap_left = s->face->glyph->bitmap_left;
glyph->bitmap_top = s->face->glyph->bitmap_top;
glyph->advance = s->face->glyph->advance.x >> 6;
/* measure text height to calculate text_height (or the maximum text height) */
FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
/* cache the newly created glyph */
if (!(node = av_tree_node_alloc())) {
ret = AVERROR(ENOMEM);
goto error;
}
av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
if (glyph_ptr)
*glyph_ptr = glyph;
return 0;
error:
if (glyph)
av_freep(&glyph->glyph);
av_freep(&glyph);
av_freep(&node);
return ret;
}
static int parse_font(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
#if !CONFIG_LIBFONTCONFIG
if (!s->fontfile) {
av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
return AVERROR(EINVAL);
}
return 0;
#else
FcPattern *pat, *best;
FcResult result = FcResultMatch;
FcBool fc_bool;
FcChar8* fc_string;
int err = AVERROR(ENOENT);
if (s->fontfile)
return 0;
if (!FcInit())
return AVERROR_UNKNOWN;
if (!(pat = FcPatternCreate()))
return AVERROR(ENOMEM);
FcPatternAddString(pat, FC_FAMILY, s->font);
FcPatternAddBool(pat, FC_OUTLINE, FcTrue);
FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
FcDefaultSubstitute(pat);
if (!FcConfigSubstitute(NULL, pat, FcMatchPattern)) {
FcPatternDestroy(pat);
return AVERROR(ENOMEM);
}
best = FcFontMatch(NULL, pat, &result);
FcPatternDestroy(pat);
if (!best || result == FcResultNoMatch) {
av_log(ctx, AV_LOG_ERROR,
"Cannot find a valid font for the family %s\n",
s->font);
goto fail;
}
if (FcPatternGetBool(best, FC_OUTLINE, 0, &fc_bool) != FcResultMatch ||
!fc_bool) {
av_log(ctx, AV_LOG_ERROR, "Outline not available for %s\n",
s->font);
goto fail;
}
if (FcPatternGetString(best, FC_FAMILY, 0, &fc_string) != FcResultMatch) {
av_log(ctx, AV_LOG_ERROR, "No matches for %s\n",
s->font);
goto fail;
}
if (FcPatternGetString(best, FC_FILE, 0, &fc_string) != FcResultMatch) {
av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
s->font);
goto fail;
}
s->fontfile = av_strdup(fc_string);
if (!s->fontfile)
err = AVERROR(ENOMEM);
else
err = 0;
fail:
FcPatternDestroy(best);
return err;
#endif
}
static av_cold int init(AVFilterContext *ctx)
{
int err;
DrawTextContext *s = ctx->priv;
Glyph *glyph;
if ((err = parse_font(ctx)) < 0)
return err;
if (s->textfile) {
uint8_t *textbuf;
size_t textbuf_size;
if (s->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(s->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",
s->textfile);
return err;
}
if (textbuf_size > SIZE_MAX - 1 ||
!(s->text = av_malloc(textbuf_size + 1))) {
av_file_unmap(textbuf, textbuf_size);
return AVERROR(ENOMEM);
}
memcpy(s->text, textbuf, textbuf_size);
s->text[textbuf_size] = 0;
av_file_unmap(textbuf, textbuf_size);
}
if (!s->text) {
av_log(ctx, AV_LOG_ERROR,
"Either text or a valid file must be provided\n");
return AVERROR(EINVAL);
}
if ((err = av_parse_color(s->fontcolor_rgba, s->fontcolor_string, -1, ctx))) {
av_log(ctx, AV_LOG_ERROR,
"Invalid font color '%s'\n", s->fontcolor_string);
return err;
}
if ((err = av_parse_color(s->boxcolor_rgba, s->boxcolor_string, -1, ctx))) {
av_log(ctx, AV_LOG_ERROR,
"Invalid box color '%s'\n", s->boxcolor_string);
return err;
}
if ((err = av_parse_color(s->shadowcolor_rgba, s->shadowcolor_string, -1, ctx))) {
av_log(ctx, AV_LOG_ERROR,
"Invalid shadow color '%s'\n", s->shadowcolor_string);
return err;
}
if ((err = FT_Init_FreeType(&(s->library)))) {
av_log(ctx, AV_LOG_ERROR,
"Could not load FreeType: %s\n", FT_ERRMSG(err));
return AVERROR(EINVAL);
}
/* load the face, and set up the encoding, which is by default UTF-8 */
if ((err = FT_New_Face(s->library, s->fontfile, 0, &s->face))) {
av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
s->fontfile, FT_ERRMSG(err));
return AVERROR(EINVAL);
}
if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
s->fontsize, FT_ERRMSG(err));
return AVERROR(EINVAL);
}
s->use_kerning = FT_HAS_KERNING(s->face);
/* load the fallback glyph with code 0 */
load_glyph(ctx, NULL, 0);
/* set the tabsize in pixels */
if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
return err;
}
s->tabsize *= glyph->advance;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int glyph_enu_free(void *opaque, void *elem)
{
av_free(elem);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
int i;
av_expr_free(s->x_pexpr);
av_expr_free(s->y_pexpr);
av_expr_free(s->d_pexpr);
s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;
av_freep(&s->expanded_text);
av_freep(&s->positions);
av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
av_tree_destroy(s->glyphs);
s->glyphs = 0;
FT_Done_Face(s->face);
FT_Done_FreeType(s->library);
for (i = 0; i < 4; i++) {
av_freep(&s->box_line[i]);
s->pixel_step[i] = 0;
}
}
static inline int is_newline(uint32_t c)
{
return c == '\n' || c == '\r' || c == '\f' || c == '\v';
}
static int expand_strftime(DrawTextContext *s)
{
struct tm ltime;
time_t now = time(0);
uint8_t *buf = s->expanded_text;
int buf_size = s->expanded_text_size;
if (!buf)
buf_size = 2 * strlen(s->text) + 1;
localtime_r(&now, <ime);
while ((buf = av_realloc(buf, buf_size))) {
*buf = 1;
if (strftime(buf, buf_size, s->text, <ime) != 0 || *buf == 0)
break;
buf_size *= 2;
}
if (!buf)
return AVERROR(ENOMEM);
s->expanded_text = buf;
s->expanded_text_size = buf_size;
return 0;
}
static int dtext_prepare_text(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
uint32_t code = 0, prev_code = 0;
int x = 0, y = 0, i = 0, ret;
int text_height, baseline;
char *text;
uint8_t *p;
int str_w = 0, len;
int y_min = 32000, y_max = -32000;
FT_Vector delta;
Glyph *glyph = NULL, *prev_glyph = NULL;
Glyph dummy = { 0 };
int width = ctx->inputs[0]->w;
int height = ctx->inputs[0]->h;
ret = expand_strftime(s);
if (ret < 0)
return ret;
text = s->expanded_text ? s->expanded_text : s->text;
if ((len = strlen(text)) > s->nb_positions) {
FT_Vector *p = av_realloc(s->positions,
len * sizeof(*s->positions));
if (!p) {
av_freep(s->positions);
s->nb_positions = 0;
return AVERROR(ENOMEM);
} else {
s->positions = p;
s->nb_positions = len;
}
}
/* load and cache glyphs */
for (i = 0, p = text; *p; i++) {
GET_UTF8(code, *p++, continue;);
/* get glyph */
dummy.code = code;
glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
if (!glyph) {
ret = load_glyph(ctx, &glyph, code);
if (ret)
return ret;
}
y_min = FFMIN(glyph->bbox.yMin, y_min);
y_max = FFMAX(glyph->bbox.yMax, y_max);
}
text_height = y_max - y_min;
baseline = y_max;
/* compute and save position for each glyph */
glyph = NULL;
for (i = 0, p = text; *p; i++) {
GET_UTF8(code, *p++, continue;);
/* skip the \n in the sequence \r\n */
if (prev_code == '\r' && code == '\n')
continue;
prev_code = code;
if (is_newline(code)) {
str_w = FFMAX(str_w, x - s->x);
y += text_height;
x = 0;
continue;
}
/* get glyph */
prev_glyph = glyph;
dummy.code = code;
glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
/* kerning */
if (s->use_kerning && prev_glyph && glyph->code) {
FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
ft_kerning_default, &delta);
x += delta.x >> 6;
}
if (x + glyph->bbox.xMax >= width) {
str_w = FFMAX(str_w, x);
y += text_height;
x = 0;
}
/* save position */
s->positions[i].x = x + glyph->bitmap_left;
s->positions[i].y = y - glyph->bitmap_top + baseline;
if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
else x += glyph->advance;
}
str_w = FFMIN(width - 1, FFMAX(str_w, x));
y = FFMIN(y + text_height, height - 1);
s->w = str_w;
s->var_values[VAR_TEXT_W] = s->var_values[VAR_TW] = s->w;
s->h = y;
s->var_values[VAR_TEXT_H] = s->var_values[VAR_TH] = s->h;
return 0;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
DrawTextContext *s = ctx->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
int ret;
s->hsub = pix_desc->log2_chroma_w;
s->vsub = pix_desc->log2_chroma_h;
s->var_values[VAR_E ] = M_E;
s->var_values[VAR_PHI] = M_PHI;
s->var_values[VAR_PI ] = M_PI;
s->var_values[VAR_MAIN_W] =
s->var_values[VAR_MW] = ctx->inputs[0]->w;
s->var_values[VAR_MAIN_H] =
s->var_values[VAR_MH] = ctx->inputs[0]->h;
s->var_values[VAR_X] = 0;
s->var_values[VAR_Y] = 0;
s->var_values[VAR_T] = NAN;
av_lfg_init(&s->prng, av_get_random_seed());
av_expr_free(s->x_pexpr);
av_expr_free(s->y_pexpr);
av_expr_free(s->d_pexpr);
s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;
if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
(ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
(ret = av_expr_parse(&s->d_pexpr, s->d_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
(ret = av_expr_parse(&s->a_pexpr, s->a_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
return AVERROR(EINVAL);
if ((ret =
ff_fill_line_with_color(s->box_line, s->pixel_step,
inlink->w, s->boxcolor,
inlink->format, s->boxcolor_rgba,
&s->is_packed_rgb, s->rgba_map)) < 0)
return ret;
if (!s->is_packed_rgb) {
uint8_t *rgba = s->fontcolor_rgba;
s->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
s->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
s->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
s->fontcolor[3] = rgba[3];
rgba = s->shadowcolor_rgba;
s->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
s->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
s->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
s->shadowcolor[3] = rgba[3];
}
s->draw = 1;
return dtext_prepare_text(ctx);
}
#define GET_BITMAP_VAL(r, c) \
bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
(bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
bitmap->buffer[(r) * bitmap->pitch + (c)]
#define SET_PIXEL_YUV(frame, yuva_color, val, x, y, hsub, vsub) { \
luma_pos = ((x) ) + ((y) ) * frame->linesize[0]; \
alpha = yuva_color[3] * alpha_mul * (val) * 129 / 255; \
frame->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * frame->data[0][luma_pos] ) >> 23; \
if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[1]; \
chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[2]; \
frame->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * frame->data[1][chroma_pos1]) >> 23; \
frame->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * frame->data[2][chroma_pos2]) >> 23; \
}\
}
static inline int draw_glyph_yuv(AVFrame *frame, FT_Bitmap *bitmap, unsigned int x,
unsigned int y, unsigned int width, unsigned int height,
const uint8_t yuva_color[4], int hsub, int vsub,
int alpha_mul)
{
int r, c, alpha;
unsigned int luma_pos, chroma_pos1, chroma_pos2;
uint8_t src_val;
for (r = 0; r < bitmap->rows && r+y < height; r++) {
for (c = 0; c < bitmap->width && c+x < width; c++) {
/* get intensity value in the glyph bitmap (source) */
src_val = GET_BITMAP_VAL(r, c);
if (!src_val)
continue;
SET_PIXEL_YUV(frame, yuva_color, src_val, c+x, y+r, hsub, vsub);
}
}
return 0;
}
#define SET_PIXEL_RGB(frame, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
p = frame->data[0] + (x) * pixel_step + ((y) * frame->linesize[0]); \
alpha = rgba_color[3] * alpha_mul * (val) * 129 / 255; \
*(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
*(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
*(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
}
static inline int draw_glyph_rgb(AVFrame *frame, FT_Bitmap *bitmap,
unsigned int x, unsigned int y,
unsigned int width, unsigned int height, int pixel_step,
const uint8_t rgba_color[4], const uint8_t rgba_map[4],
int alpha_mul)
{
int r, c, alpha;
uint8_t *p;
uint8_t src_val;
for (r = 0; r < bitmap->rows && r+y < height; r++) {
for (c = 0; c < bitmap->width && c+x < width; c++) {
/* get intensity value in the glyph bitmap (source) */
src_val = GET_BITMAP_VAL(r, c);
if (!src_val)
continue;
SET_PIXEL_RGB(frame, rgba_color, src_val, c+x, y+r, pixel_step,
rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
}
}
return 0;
}
static inline void drawbox(AVFrame *frame, unsigned int x, unsigned int y,
unsigned int width, unsigned int height,
uint8_t *line[4], int pixel_step[4], uint8_t color[4],
int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4],
int alpha_mul)
{
int i, j, alpha;
if (color[3] != 0xFF || alpha_mul != 0xFF) {
if (is_rgba_packed) {
uint8_t *p;
for (j = 0; j < height; j++)
for (i = 0; i < width; i++)
SET_PIXEL_RGB(frame, color, 255, i+x, y+j, pixel_step[0],
rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
} else {
unsigned int luma_pos, chroma_pos1, chroma_pos2;
for (j = 0; j < height; j++)
for (i = 0; i < width; i++)
SET_PIXEL_YUV(frame, color, 255, i+x, y+j, hsub, vsub);
}
} else {
ff_draw_rectangle(frame->data, frame->linesize,
line, pixel_step, hsub, vsub,
x, y, width, height);
}
}
static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
int width, int height,
const uint8_t rgbcolor[4], const uint8_t yuvcolor[4],
int x, int y)
{
char *text = s->expanded_text;
uint32_t code = 0;
int i;
uint8_t *p;
Glyph *glyph = NULL;
for (i = 0, p = text; *p; i++) {
Glyph dummy = { 0 };
GET_UTF8(code, *p++, continue;);
/* skip new line chars, just go to new line */
if (code == '\n' || code == '\r' || code == '\t')
continue;
dummy.code = code;
glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
return AVERROR(EINVAL);
if (s->is_packed_rgb) {
draw_glyph_rgb(frame, &glyph->bitmap,
s->positions[i].x+x, s->positions[i].y+y, width, height,
s->pixel_step[0], rgbcolor, s->rgba_map, s->alpha);
} else {
draw_glyph_yuv(frame, &glyph->bitmap,
s->positions[i].x+x, s->positions[i].y+y, width, height,
yuvcolor, s->hsub, s->vsub, s->alpha);
}
}
return 0;
}
static int draw_text(AVFilterContext *ctx, AVFrame *frame,
int width, int height)
{
DrawTextContext *s = ctx->priv;
int ret;
/* draw box */
if (s->draw_box)
drawbox(frame, s->x, s->y, s->w, s->h,
s->box_line, s->pixel_step, s->boxcolor,
s->hsub, s->vsub, s->is_packed_rgb,
s->rgba_map, s->alpha);
if (s->shadowx || s->shadowy) {
if ((ret = draw_glyphs(s, frame, width, height,
s->shadowcolor_rgba,
s->shadowcolor,
s->x + s->shadowx,
s->y + s->shadowy)) < 0)
return ret;
}
if ((ret = draw_glyphs(s, frame, width, height,
s->fontcolor_rgba,
s->fontcolor,
s->x,
s->y)) < 0)
return ret;
return 0;
}
static inline int normalize_double(int *n, double d)
{
int ret = 0;
if (isnan(d)) {
ret = AVERROR(EINVAL);
} else if (d > INT_MAX || d < INT_MIN) {
*n = d > INT_MAX ? INT_MAX : INT_MIN;
ret = AVERROR(EINVAL);
} else
*n = round(d);
return ret;
}
static void update_alpha(DrawTextContext *s)
{
double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);
if (isnan(alpha))
return;
if (alpha >= 1.0)
s->alpha = 255;
else if (alpha <= 0)
s->alpha = 0;
else
s->alpha = 256 * alpha;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
DrawTextContext *s = ctx->priv;
int ret = 0;
if ((ret = dtext_prepare_text(ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");
av_frame_free(&frame);
return ret;
}
s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
NAN : frame->pts * av_q2d(inlink->time_base);
s->var_values[VAR_X] =
av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
s->var_values[VAR_Y] =
av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
s->var_values[VAR_X] =
av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
s->draw = av_expr_eval(s->d_pexpr, s->var_values, &s->prng);
update_alpha(s);
normalize_double(&s->x, s->var_values[VAR_X]);
normalize_double(&s->y, s->var_values[VAR_Y]);
if (s->fix_bounds) {
if (s->x < 0) s->x = 0;
if (s->y < 0) s->y = 0;
if ((unsigned)s->x + (unsigned)s->w > inlink->w)
s->x = inlink->w - s->w;
if ((unsigned)s->y + (unsigned)s->h > inlink->h)
s->y = inlink->h - s->h;
}
s->x &= ~((1 << s->hsub) - 1);
s->y &= ~((1 << s->vsub) - 1);
av_log(ctx, AV_LOG_TRACE, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
(int)s->var_values[VAR_N], s->var_values[VAR_T],
s->x, s->y, s->x+s->w, s->y+s->h);
if (s->draw)
draw_text(inlink->dst, frame, frame->width, frame->height);
s->var_values[VAR_N] += 1.0;
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
.config_props = config_input,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_drawtext = {
.name = "drawtext",
.description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
.priv_size = sizeof(DrawTextContext),