mirror of https://github.com/mpv-player/mpv
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
#include <regex.h>
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#include <sys/types.h>
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#include "common/common.h"
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#include "common/msg.h"
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#include "misc/bstr.h"
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#include "options/options.h"
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#include "sd.h"
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struct priv {
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int offset;
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regex_t *regexes;
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int num_regexes;
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};
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static bool rf_init(struct sd_filter *ft)
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{
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if (strcmp(ft->codec, "ass") != 0)
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return false;
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if (!ft->opts->rf_enable)
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return false;
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struct priv *p = talloc_zero(ft, struct priv);
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ft->priv = p;
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for (int n = 0; ft->opts->rf_items && ft->opts->rf_items[n]; n++) {
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char *item = ft->opts->rf_items[n];
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MP_TARRAY_GROW(p, p->regexes, p->num_regexes);
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regex_t *preg = &p->regexes[p->num_regexes];
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int err = regcomp(preg, item, REG_ICASE | REG_EXTENDED | REG_NOSUB);
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if (err) {
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char errbuf[512];
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regerror(err, preg, errbuf, sizeof(errbuf));
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MP_ERR(ft, "Regular expression error: '%s'\n", errbuf);
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continue;
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}
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p->num_regexes += 1;
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}
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if (!p->num_regexes)
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return false;
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char *headers = ft->event_format;
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while (headers && headers[0]) {
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p->offset += 1;
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headers = strchr(headers, ',');
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if (headers)
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headers += 1;
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}
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p->offset -= 1; // removes Start/End, adds ReadOrder
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return true;
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}
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static void rf_uninit(struct sd_filter *ft)
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{
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struct priv *p = ft->priv;
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for (int n = 0; n < p->num_regexes; n++)
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regfree(&p->regexes[n]);
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}
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static struct demux_packet *rf_filter(struct sd_filter *ft,
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struct demux_packet *pkt)
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{
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struct priv *p = ft->priv;
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char *line = bstrto0(NULL, (bstr){(char *)pkt->buffer, pkt->len});
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bool drop = false;
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char *text = line;
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for (int n = 0; n < p->offset - 1; n++) {
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text = strchr(text, ',');
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if (!text) {
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MP_WARN(ft, "Malformed event: '%s'\n", line);
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text = line; // shouldn't happen; random fallback
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break;
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}
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text = text + 1;
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}
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for (int n = 0; n < p->num_regexes; n++) {
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int err = regexec(&p->regexes[n], text, 0, NULL, 0);
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if (err == 0) {
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int level = ft->opts->rf_warn ? MSGL_WARN : MSGL_V;
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MP_MSG(ft, level, "Matching regex %d => drop: '%s'\n", n, text);
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drop = true;
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break;
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} else if (err != REG_NOMATCH) {
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MP_WARN(ft, "Error on regexec() on regex %d.\n", n);
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}
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}
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talloc_free(line);
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return drop ? NULL : pkt;
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}
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const struct sd_filter_functions sd_filter_regex = {
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.init = rf_init,
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.uninit = rf_uninit,
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.filter = rf_filter,
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};
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