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FFmpeg/libavfilter/qrencode.c

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/*
* 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
*/
/**
* @file QR encoder source and filter.
*
* A QR code (quick-response code) is a type of two-dimensional matrix
* barcode, invented in 1994, by Japanese company Denso Wave for
* labelling automobile parts.
*
* This source uses the libqrencode library to generate QR code:
* https://fukuchi.org/works/qrencode/
*/
//#define DEBUG
#include "config_components.h"
#include "libavutil/internal.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/lfg.h"
#include "libavutil/random_seed.h"
#include "avfilter.h"
#include "drawutils.h"
#include "internal.h"
#include "formats.h"
#include "textutils.h"
#include "video.h"
#include "libswscale/swscale.h"
#include <qrencode.h>
enum var_name {
VAR_dar,
VAR_duration,
VAR_hsub, VAR_vsub,
VAR_main_h, VAR_H,
VAR_main_w, VAR_W,
VAR_n,
VAR_pict_type,
VAR_qr_w, VAR_w,
VAR_rendered_padded_qr_w, VAR_Q,
VAR_rendered_qr_w, VAR_q,
VAR_sar,
VAR_t,
VAR_x,
VAR_y,
VAR_VARS_NB
};
static const char *const var_names[] = {
"dar",
"duration",
"hsub", "vsub",
"main_h", "H", ///< height of the input video
"main_w", "W", ///< width of the input video
"n", ///< number of frame
"pict_type",
"qr_w", "w", ///< width of the QR code
"rendered_padded_qr_w", "Q", ///< width of the rendered QR code
"rendered_qr_w", "q", ///< width of the rendered QR code
"sar",
"t", ///< timestamp expressed in seconds
"x",
"y",
NULL
};
#define V(name_) qr->var_values[VAR_##name_]
enum Expansion {
EXPANSION_NONE,
EXPANSION_NORMAL
};
typedef struct QREncodeContext {
const AVClass *class;
char is_source;
char *x_expr;
char *y_expr;
AVExpr *x_pexpr, *y_pexpr;
char *rendered_qrcode_width_expr;
char *rendered_padded_qrcode_width_expr;
AVExpr *rendered_qrcode_width_pexpr, *rendered_padded_qrcode_width_pexpr;
int rendered_qrcode_width;
int rendered_padded_qrcode_width;
unsigned char *text;
char *textfile;
uint64_t pts;
int level;
char case_sensitive;
uint8_t foreground_color[4];
uint8_t background_color[4];
FFDrawContext draw;
FFDrawColor draw_foreground_color; ///< foreground color
FFDrawColor draw_background_color; ///< background color
/* these are only used when nothing must be encoded */
FFDrawContext draw0;
FFDrawColor draw0_background_color; ///< background color
uint8_t *qrcode_data[4];
int qrcode_linesize[4];
uint8_t *qrcode_mask_data[4];
int qrcode_mask_linesize[4];
/* only used for filter to contain scaled image to blend on top of input */
uint8_t *rendered_qrcode_data[4];
int rendered_qrcode_linesize[4];
int qrcode_width;
int padded_qrcode_width;
AVRational frame_rate;
int expansion; ///< expansion mode to use for the text
FFExpandTextContext expand_text; ///< expand text in case expansion is enabled
AVBPrint expanded_text; ///< used to contain the expanded text
double var_values[VAR_VARS_NB];
AVLFG lfg; ///< random generator
AVDictionary *metadata;
} QREncodeContext;
#define OFFSET(x) offsetof(QREncodeContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
#define COMMON_OPTIONS \
{ "qrcode_width", "set rendered QR code width expression", OFFSET(rendered_qrcode_width_expr), AV_OPT_TYPE_STRING, {.str = "64"}, 0, INT_MAX, FLAGS }, \
{ "q", "set rendered QR code width expression", OFFSET(rendered_qrcode_width_expr), AV_OPT_TYPE_STRING, {.str = "64"}, 0, INT_MAX, FLAGS }, \
{ "padded_qrcode_width", "set rendered padded QR code width expression", OFFSET(rendered_padded_qrcode_width_expr), AV_OPT_TYPE_STRING, {.str = "q"}, 0, INT_MAX, FLAGS }, \
{ "Q", "set rendered padded QR code width expression", OFFSET(rendered_padded_qrcode_width_expr), AV_OPT_TYPE_STRING, {.str = "q"}, 0, INT_MAX, FLAGS }, \
{ "case_sensitive", "generate code which is case sensitive", OFFSET(case_sensitive), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS }, \
{ "cs", "generate code which is case sensitive", OFFSET(case_sensitive), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS }, \
\
{ "level", "error correction level, lowest is L", OFFSET(level), AV_OPT_TYPE_INT, { .i64 = AVCOL_SPC_UNSPECIFIED }, 0, QR_ECLEVEL_H, .flags = FLAGS, .unit = "level"}, \
{ "l", "error correction level, lowest is L", OFFSET(level), AV_OPT_TYPE_INT, { .i64 = AVCOL_SPC_UNSPECIFIED }, 0, QR_ECLEVEL_H, .flags = FLAGS, .unit = "level"}, \
{ "L", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = QR_ECLEVEL_L }, 0, 0, FLAGS, .unit = "level" }, \
{ "M", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = QR_ECLEVEL_M }, 0, 0, FLAGS, .unit = "level" }, \
{ "Q", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = QR_ECLEVEL_Q }, 0, 0, FLAGS, .unit = "level" }, \
{ "H", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = QR_ECLEVEL_H }, 0, 0, FLAGS, .unit = "level" }, \
\
{"expansion", "set the expansion mode", OFFSET(expansion), AV_OPT_TYPE_INT, {.i64=EXPANSION_NORMAL}, 0, 2, FLAGS, .unit = "expansion"}, \
{"none", "set no expansion", OFFSET(expansion), AV_OPT_TYPE_CONST, {.i64 = EXPANSION_NONE}, 0, 0, FLAGS, .unit = "expansion"}, \
{"normal", "set normal expansion", OFFSET(expansion), AV_OPT_TYPE_CONST, {.i64 = EXPANSION_NORMAL}, 0, 0, FLAGS, .unit = "expansion"}, \
\
{ "foreground_color", "set QR foreground color", OFFSET(foreground_color), AV_OPT_TYPE_COLOR, {.str = "black"}, 0, 0, FLAGS }, \
{ "fc", "set QR foreground color", OFFSET(foreground_color), AV_OPT_TYPE_COLOR, {.str = "black"}, 0, 0, FLAGS }, \
{ "background_color", "set QR background color", OFFSET(background_color), AV_OPT_TYPE_COLOR, {.str = "white"}, 0, 0, FLAGS }, \
{ "bc", "set QR background color", OFFSET(background_color), AV_OPT_TYPE_COLOR, {.str = "white"}, 0, 0, FLAGS }, \
\
{"text", "set text to encode", OFFSET(text), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS}, \
{"textfile", "set text file to encode", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS}, \
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);
}
static const ff_eval_func2 fun2[] = {
drand,
NULL
};
static int func_pts(void *ctx, AVBPrint *bp, const char *function_name,
unsigned argc, char **argv)
{
QREncodeContext *qr = ((AVFilterContext *)ctx)->priv;
const char *fmt;
const char *strftime_fmt = NULL;
const char *delta = NULL;
double t = qr->var_values[VAR_t];
// argv: pts, FMT, [DELTA, strftime_fmt]
fmt = argc >= 1 ? argv[0] : "flt";
if (argc >= 2) {
delta = argv[1];
}
if (argc >= 3) {
strftime_fmt = argv[2];
}
return ff_print_pts(ctx, bp, t, delta, fmt, strftime_fmt);
}
static int func_frame_num(void *ctx, AVBPrint *bp, const char *function_name,
unsigned argc, char **argv)
{
QREncodeContext *qr = ((AVFilterContext *)ctx)->priv;
av_bprintf(bp, "%d", (int)V(n));
return 0;
}
static int func_strftime(void *ctx, AVBPrint *bp, const char *function_name,
unsigned argc, char **argv)
{
const char *strftime_fmt = argc ? argv[0] : NULL;
return ff_print_time(ctx, bp, strftime_fmt, !strcmp(function_name, "localtime"));
}
static int func_frame_metadata(void *ctx, AVBPrint *bp, const char *function_name,
unsigned argc, char **argv)
{
QREncodeContext *qr = ((AVFilterContext *)ctx)->priv;
AVDictionaryEntry *e = av_dict_get(qr->metadata, argv[0], NULL, 0);
if (e && e->value)
av_bprintf(bp, "%s", e->value);
else if (argc >= 2)
av_bprintf(bp, "%s", argv[1]);
return 0;
}
static int func_eval_expr(void *ctx, AVBPrint *bp, const char *function_name,
unsigned argc, char **argv)
{
QREncodeContext *qr = ((AVFilterContext *)ctx)->priv;
return ff_print_eval_expr(ctx, bp, argv[0],
fun2_names, fun2,
var_names, qr->var_values, &qr->lfg);
}
static int func_eval_expr_formatted(void *ctx, AVBPrint *bp, const char *function_name,
unsigned argc, char **argv)
{
QREncodeContext *qr = ((AVFilterContext *)ctx)->priv;
int ret;
int positions = -1;
/*
* argv[0] expression to be converted to `int`
* argv[1] format: 'x', 'X', 'd' or 'u'
* argv[2] positions printed (optional)
*/
if (argc == 3) {
ret = sscanf(argv[2], "%u", &positions);
if (ret != 1) {
av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
" to print: '%s'\n", argv[2]);
return AVERROR(EINVAL);
}
}
return ff_print_formatted_eval_expr(ctx, bp, argv[0],
fun2_names, fun2,
var_names, qr->var_values,
&qr->lfg,
argv[1][0], positions);
}
static FFExpandTextFunction expand_text_functions[] = {
{ "expr", 1, 1, func_eval_expr },
{ "e", 1, 1, func_eval_expr },
{ "expr_formatted", 2, 3, func_eval_expr_formatted },
{ "ef", 2, 3, func_eval_expr_formatted },
{ "metadata", 1, 2, func_frame_metadata },
{ "frame_num", 0, 0, func_frame_num },
{ "n", 0, 0, func_frame_num },
{ "gmtime", 0, 1, func_strftime },
{ "localtime", 0, 1, func_strftime },
{ "pts", 0, 3, func_pts }
};
static av_cold int init(AVFilterContext *ctx)
{
QREncodeContext *qr = ctx->priv;
int ret;
av_lfg_init(&qr->lfg, av_get_random_seed());
qr->qrcode_width = -1;
qr->rendered_padded_qrcode_width = -1;
if (qr->textfile) {
if (qr->text) {
av_log(ctx, AV_LOG_ERROR,
"Both text and text file provided. Please provide only one\n");
return AVERROR(EINVAL);
}
if ((ret = ff_load_textfile(ctx, (const char *)qr->textfile, &(qr->text), NULL)) < 0)
return ret;
}
qr->expand_text = (FFExpandTextContext) {
.log_ctx = ctx,
.functions = expand_text_functions,
.functions_nb = FF_ARRAY_ELEMS(expand_text_functions)
};
av_bprint_init(&qr->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
QREncodeContext *qr = ctx->priv;
av_expr_free(qr->x_pexpr);
av_expr_free(qr->y_pexpr);
av_bprint_finalize(&qr->expanded_text, NULL);
av_freep(&qr->qrcode_data[0]);
av_freep(&qr->rendered_qrcode_data[0]);
av_freep(&qr->qrcode_mask_data[0]);
}
#ifdef DEBUG
static void show_qrcode(AVFilterContext *ctx, const QRcode *qrcode)
{
int i, j;
char *line = av_malloc(qrcode->width + 1);
const char *p = qrcode->data;
if (!line)
return;
for (i = 0; i < qrcode->width; i++) {
for (j = 0; j < qrcode->width; j++)
line[j] = (*p++)&1 ? '@' : ' ';
line[j] = 0;
av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
}
av_free(line);
}
#endif
static int draw_qrcode(AVFilterContext *ctx, AVFrame *frame)
{
QREncodeContext *qr = ctx->priv;
struct SwsContext *sws = NULL;
QRcode *qrcode = NULL;
int i, j;
char qrcode_width_changed;
int ret;
int offset;
uint8_t *srcp;
uint8_t *dstp0, *dstp;
av_bprint_clear(&qr->expanded_text);
switch (qr->expansion) {
case EXPANSION_NONE:
av_bprintf(&qr->expanded_text, "%s", qr->text);
break;
case EXPANSION_NORMAL:
if ((ret = ff_expand_text(&qr->expand_text, qr->text, &qr->expanded_text)) < 0)
return ret;
break;
}
if (!qr->expanded_text.str || qr->expanded_text.str[0] == 0) {
if (qr->is_source) {
ff_fill_rectangle(&qr->draw0, &qr->draw0_background_color,
frame->data, frame->linesize,
0, 0, qr->rendered_padded_qrcode_width, qr->rendered_padded_qrcode_width);
}
return 0;
}
av_log(ctx, AV_LOG_DEBUG, "Encoding string '%s'\n", qr->expanded_text.str);
qrcode = QRcode_encodeString(qr->expanded_text.str, 1, qr->level, QR_MODE_8,
qr->case_sensitive);
if (!qrcode) {
ret = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR,
"Failed to encode string with error \'%s\'\n", av_err2str(ret));
goto end;
}
av_log(ctx, AV_LOG_DEBUG,
"Encoded QR with width:%d version:%d\n", qrcode->width, qrcode->version);
#ifdef DEBUG
show_qrcode(ctx, (const QRcode *)qrcode);
#endif
qrcode_width_changed = qr->qrcode_width != qrcode->width;
qr->qrcode_width = qrcode->width;
// realloc mask if needed
if (qrcode_width_changed) {
av_freep(&qr->qrcode_mask_data[0]);
ret = av_image_alloc(qr->qrcode_mask_data, qr->qrcode_mask_linesize,
qrcode->width, qrcode->width,
AV_PIX_FMT_GRAY8, 16);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR,
"Failed to allocate image for QR code with width %d\n", qrcode->width);
goto end;
}
}
/* fill mask */
dstp0 = qr->qrcode_mask_data[0];
srcp = qrcode->data;
for (i = 0; i < qrcode->width; i++) {
dstp = dstp0;
for (j = 0; j < qrcode->width; j++)
*dstp++ = (*srcp++ & 1) ? 255 : 0;
dstp0 += qr->qrcode_mask_linesize[0];
}
if (qr->is_source) {
if (qrcode_width_changed) {
/* realloc padded image */
// compute virtual non-rendered padded size
// Q/q = W/w
qr->padded_qrcode_width =
((double)qr->rendered_padded_qrcode_width / qr->rendered_qrcode_width) * qrcode->width;
av_freep(&qr->qrcode_data[0]);
ret = av_image_alloc(qr->qrcode_data, qr->qrcode_linesize,
qr->padded_qrcode_width, qr->padded_qrcode_width,
AV_PIX_FMT_ARGB, 16);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR,
"Failed to allocate image for QR code with width %d\n",
qr->padded_qrcode_width);
goto end;
}
}
/* fill padding */
ff_fill_rectangle(&qr->draw, &qr->draw_background_color,
qr->qrcode_data, qr->qrcode_linesize,
0, 0, qr->padded_qrcode_width, qr->padded_qrcode_width);
/* blend mask */
offset = (qr->padded_qrcode_width - qr->qrcode_width) / 2;
ff_blend_mask(&qr->draw, &qr->draw_foreground_color,
qr->qrcode_data, qr->qrcode_linesize,
qr->padded_qrcode_width, qr->padded_qrcode_width,
qr->qrcode_mask_data[0], qr->qrcode_mask_linesize[0], qrcode->width, qrcode->width,
3, 0, offset, offset);
/* scale padded QR over the frame */
sws = sws_alloc_context();
if (!sws) {
ret = AVERROR(ENOMEM);
goto end;
}
av_opt_set_int(sws, "srcw", qr->padded_qrcode_width, 0);
av_opt_set_int(sws, "srch", qr->padded_qrcode_width, 0);
av_opt_set_int(sws, "src_format", AV_PIX_FMT_ARGB, 0);
av_opt_set_int(sws, "dstw", qr->rendered_padded_qrcode_width, 0);
av_opt_set_int(sws, "dsth", qr->rendered_padded_qrcode_width, 0);
av_opt_set_int(sws, "dst_format", frame->format, 0);
av_opt_set_int(sws, "sws_flags", SWS_POINT, 0);
if ((ret = sws_init_context(sws, NULL, NULL)) < 0)
goto end;
sws_scale(sws,
(const uint8_t *const *)&qr->qrcode_data, qr->qrcode_linesize,
0, qr->padded_qrcode_width,
frame->data, frame->linesize);
} else {
#define EVAL_EXPR(name_) \
av_expr_eval(qr->name_##_pexpr, qr->var_values, &qr->lfg);
V(qr_w) = V(w) = qrcode->width;
V(rendered_qr_w) = V(q) = EVAL_EXPR(rendered_qrcode_width);
V(rendered_padded_qr_w) = V(Q) = EVAL_EXPR(rendered_padded_qrcode_width);
/* It is necessary if q is expressed from Q */
V(rendered_qr_w) = V(q) = EVAL_EXPR(rendered_qrcode_width);
V(x) = EVAL_EXPR(x);
V(y) = EVAL_EXPR(y);
/* It is necessary if x is expressed from y */
V(x) = EVAL_EXPR(x);
av_log(ctx, AV_LOG_DEBUG,
"Rendering QR code with values n:%d w:%d q:%d Q:%d x:%d y:%d t:%f\n",
(int)V(n), (int)V(w), (int)V(q), (int)V(Q), (int)V(x), (int)V(y), V(t));
/* blend rectangle over the target */
ff_blend_rectangle(&qr->draw, &qr->draw_background_color,
frame->data, frame->linesize, frame->width, frame->height,
V(x), V(y), V(Q), V(Q));
if (V(q) != qr->rendered_qrcode_width) {
av_freep(&qr->rendered_qrcode_data[0]);
qr->rendered_qrcode_width = V(q);
ret = av_image_alloc(qr->rendered_qrcode_data, qr->rendered_qrcode_linesize,
qr->rendered_qrcode_width, qr->rendered_qrcode_width,
AV_PIX_FMT_GRAY8, 16);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR,
"Failed to allocate image for rendered QR code with width %d\n",
qr->rendered_qrcode_width);
goto end;
}
}
/* scale mask */
sws = sws_alloc_context();
if (!sws) {
ret = AVERROR(ENOMEM);
goto end;
}
av_opt_set_int(sws, "srcw", qr->qrcode_width, 0);
av_opt_set_int(sws, "srch", qr->qrcode_width, 0);
av_opt_set_int(sws, "src_format", AV_PIX_FMT_GRAY8, 0);
av_opt_set_int(sws, "dstw", qr->rendered_qrcode_width, 0);
av_opt_set_int(sws, "dsth", qr->rendered_qrcode_width, 0);
av_opt_set_int(sws, "dst_format", AV_PIX_FMT_GRAY8, 0);
av_opt_set_int(sws, "sws_flags", SWS_POINT, 0);
if ((ret = sws_init_context(sws, NULL, NULL)) < 0)
goto end;
sws_scale(sws,
(const uint8_t *const *)&qr->qrcode_mask_data, qr->qrcode_mask_linesize,
0, qr->qrcode_width,
qr->rendered_qrcode_data, qr->rendered_qrcode_linesize);
/* blend mask over the input frame */
offset = (V(Q) - V(q)) / 2;
ff_blend_mask(&qr->draw, &qr->draw_foreground_color,
frame->data, frame->linesize, frame->width, frame->height,
qr->rendered_qrcode_data[0], qr->rendered_qrcode_linesize[0],
qr->rendered_qrcode_width, qr->rendered_qrcode_width,
3, 0, V(x) + offset, V(y) + offset);
}
end:
sws_freeContext(sws);
QRcode_free(qrcode);
return ret;
}
#if CONFIG_QRENCODESRC_FILTER
static const AVOption qrencodesrc_options[] = {
COMMON_OPTIONS
{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(qrencodesrc);
static int qrencodesrc_config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
QREncodeContext *qr = ctx->priv;
int ret;
qr->is_source = 1;
V(x) = V(y) = 0;
#define PARSE_AND_EVAL_EXPR(var_name_, expr_name_) \
ret = av_expr_parse_and_eval(&qr->var_values[VAR_##var_name_], \
qr->expr_name_##_expr, \
var_names, qr->var_values, \
NULL, NULL, \
fun2_names, fun2, \
&qr->lfg, 0, ctx); \
if (ret < 0) { \
av_log(ctx, AV_LOG_ERROR, \
"Could not evaluate expression '%s'\n", \
qr->expr_name_##_expr); \
return ret; \
}
/* undefined for the source */
V(main_w) = V(W) = NAN;
V(main_h) = V(H) = NAN;
V(x) = V(y) = V(t) = V(n) = NAN;
V(dar) = V(sar) = 1.0;
PARSE_AND_EVAL_EXPR(rendered_qr_w, rendered_qrcode_width);
V(q) = V(rendered_qr_w);
PARSE_AND_EVAL_EXPR(rendered_padded_qr_w, rendered_padded_qrcode_width);
V(Q) = V(rendered_padded_qr_w);
PARSE_AND_EVAL_EXPR(rendered_qr_w, rendered_qrcode_width);
V(q) = V(rendered_qr_w);
qr->rendered_qrcode_width = V(rendered_qr_w);
qr->rendered_padded_qrcode_width = V(rendered_padded_qr_w);
av_log(ctx, AV_LOG_VERBOSE,
"q:%d Q:%d case_sensitive:%d level:%d\n",
(int)qr->rendered_qrcode_width, (int)qr->rendered_padded_qrcode_width,
qr->case_sensitive, qr->level);
if (qr->rendered_padded_qrcode_width < qr->rendered_qrcode_width) {
av_log(ctx, AV_LOG_ERROR,
"Resulting padded QR code width (%d) is lesser than the QR code width (%d)\n",
qr->rendered_padded_qrcode_width, qr->rendered_qrcode_width);
return AVERROR(EINVAL);
}
ff_draw_init(&qr->draw, AV_PIX_FMT_ARGB, FF_DRAW_PROCESS_ALPHA);
ff_draw_color(&qr->draw, &qr->draw_foreground_color, (const uint8_t *)&qr->foreground_color);
ff_draw_color(&qr->draw, &qr->draw_background_color, (const uint8_t *)&qr->background_color);
ff_draw_init2(&qr->draw0, outlink->format, outlink->colorspace, outlink->color_range, FF_DRAW_PROCESS_ALPHA);
ff_draw_color(&qr->draw0, &qr->draw0_background_color, (const uint8_t *)&qr->background_color);
outlink->w = qr->rendered_padded_qrcode_width;
outlink->h = qr->rendered_padded_qrcode_width;
outlink->time_base = av_inv_q(qr->frame_rate);
outlink->frame_rate = qr->frame_rate;
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = (AVFilterContext *)outlink->src;
QREncodeContext *qr = ctx->priv;
AVFrame *frame =
ff_get_video_buffer(outlink, qr->rendered_padded_qrcode_width, qr->rendered_padded_qrcode_width);
int ret;
if (!frame)
return AVERROR(ENOMEM);
frame->sample_aspect_ratio = (AVRational) {1, 1};
V(n) = frame->pts = qr->pts++;
V(t) = qr->pts * av_q2d(outlink->time_base);
if ((ret = draw_qrcode(ctx, frame)) < 0)
return ret;
return ff_filter_frame(outlink, frame);
}
static int qrencodesrc_query_formats(AVFilterContext *ctx)
{
enum AVPixelFormat pix_fmt;
FFDrawContext draw;
AVFilterFormats *fmts = NULL;
int ret;
// this is needed to support both the no-draw and draw cases
// for the no-draw case we use FFDrawContext to write on the input picture ref
for (pix_fmt = 0; av_pix_fmt_desc_get(pix_fmt); pix_fmt++)
if (ff_draw_init(&draw, pix_fmt, 0) >= 0 &&
sws_isSupportedOutput(pix_fmt) &&
(ret = ff_add_format(&fmts, pix_fmt)) < 0)
return ret;
return ff_set_common_formats(ctx, fmts);
}
static const AVFilterPad qrencodesrc_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.config_props = qrencodesrc_config_props,
}
};
const AVFilter ff_vsrc_qrencodesrc = {
.name = "qrencodesrc",
.description = NULL_IF_CONFIG_SMALL("Generate a QR code."),
.priv_size = sizeof(QREncodeContext),
.priv_class = &qrencodesrc_class,
.init = init,
.uninit = uninit,
.inputs = NULL,
FILTER_OUTPUTS(qrencodesrc_outputs),
FILTER_QUERY_FUNC(qrencodesrc_query_formats),
};
#endif // CONFIG_QRENCODESRC_FILTER
#if CONFIG_QRENCODE_FILTER
static const AVOption qrencode_options[] = {
COMMON_OPTIONS
{"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, TFLAGS},
{"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, TFLAGS},
{ NULL }
};
AVFILTER_DEFINE_CLASS(qrencode);
static int qrencode_config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
QREncodeContext *qr = ctx->priv;
char *expr;
int ret;
qr->is_source = 0;
ff_draw_init2(&qr->draw, inlink->format, inlink->colorspace, inlink->color_range,
FF_DRAW_PROCESS_ALPHA);
V(W) = V(main_w) = inlink->w;
V(H) = V(main_h) = inlink->h;
V(sar) = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
V(dar) = (double)inlink->w / inlink->h * V(sar);
V(hsub) = 1 << qr->draw.hsub_max;
V(vsub) = 1 << qr->draw.vsub_max;
V(t) = NAN;
V(x) = V(y) = NAN;
qr->x_pexpr = qr->y_pexpr = NULL;
qr->x_pexpr = qr->y_pexpr = NULL;
#define PARSE_EXPR(name_) \
ret = av_expr_parse(&qr->name_##_pexpr, expr = qr->name_##_expr, var_names, \
NULL, NULL, fun2_names, fun2, 0, ctx); \
if (ret < 0) { \
av_log(ctx, AV_LOG_ERROR, \
"Could not to parse expression '%s' for '%s'\n", \
expr, #name_); \
return AVERROR(EINVAL); \
}
PARSE_EXPR(x);
PARSE_EXPR(y);
PARSE_EXPR(rendered_qrcode_width);
PARSE_EXPR(rendered_padded_qrcode_width);
ff_draw_init2(&qr->draw, inlink->format, inlink->colorspace, inlink->color_range,
FF_DRAW_PROCESS_ALPHA);
ff_draw_color(&qr->draw, &qr->draw_foreground_color, (const uint8_t *)&qr->foreground_color);
ff_draw_color(&qr->draw, &qr->draw_background_color, (const uint8_t *)&qr->background_color);
qr->rendered_qrcode_width = -1;
return 0;
}
static int qrencode_query_formats(AVFilterContext *ctx)
{
return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
QREncodeContext *qr = ctx->priv;
int ret;
V(n) = inlink->frame_count_out;
V(t) = frame->pts == AV_NOPTS_VALUE ?
NAN : frame->pts * av_q2d(inlink->time_base);
V(pict_type) = frame->pict_type;
V(duration) = frame->duration * av_q2d(inlink->time_base);
qr->metadata = frame->metadata;
if ((ret = draw_qrcode(ctx, frame)) < 0)
return ret;
return ff_filter_frame(outlink, frame);
}
static const AVFilterPad avfilter_vf_qrencode_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = qrencode_config_input,
},
};
const AVFilter ff_vf_qrencode = {
.name = "qrencode",
.description = NULL_IF_CONFIG_SMALL("Draw a QR code on top of video frames."),
.priv_size = sizeof(QREncodeContext),
.priv_class = &qrencode_class,
.init = init,
.uninit = uninit,
FILTER_INPUTS(avfilter_vf_qrencode_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(qrencode_query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
#endif // CONFIG_QRENCODE_FILTER