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C
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#include <stdarg.h>#include <math.h>#include <assert.h>
#include <libavutil/common.h>#include <libavutil/error.h>
#include "mpv_talloc.h"#include "misc/bstr.h"#include "misc/ctype.h"#include "common/common.h"#include "osdep/strnlen.h"
#define appendf(ptr, ...) \ do {(*(ptr)) = talloc_asprintf_append_buffer(*(ptr), __VA_ARGS__);} while(0)
// Return a talloc'ed string formatted according to the format string in fmt.// On error, return NULL.// Valid formats:// %H, %h: hour (%H is padded with 0 to two digits)// %M: minutes from 00-59 (hours are subtracted)// %m: total minutes (includes hours, unlike %M)// %S: seconds from 00-59 (minutes and hours are subtracted)// %s: total seconds (includes hours and minutes)// %f: like %s, but as float// %T: milliseconds (000-999)char *mp_format_time_fmt(const char *fmt, double time){ if (time == MP_NOPTS_VALUE) return talloc_strdup(NULL, "unknown"); char *sign = time < 0 ? "-" : ""; time = time < 0 ? -time : time; long long int itime = time; long long int h, m, tm, s; int ms = lrint((time - itime) * 1000); if (ms >= 1000) { ms -= 1000; itime += 1; } s = itime; tm = s / 60; h = s / 3600; s -= h * 3600; m = s / 60; s -= m * 60; char *res = talloc_strdup(NULL, ""); while (*fmt) { if (fmt[0] == '%') { fmt++; switch (fmt[0]) { case 'h': appendf(&res, "%s%lld", sign, h); break; case 'H': appendf(&res, "%s%02lld", sign, h); break; case 'm': appendf(&res, "%s%lld", sign, tm); break; case 'M': appendf(&res, "%02lld", m); break; case 's': appendf(&res, "%s%lld", sign, itime); break; case 'S': appendf(&res, "%02lld", s); break; case 'T': appendf(&res, "%03d", ms); break; case 'f': appendf(&res, "%f", time); break; case '%': appendf(&res, "%s", "%"); break; default: goto error; } fmt++; } else { appendf(&res, "%c", *fmt); fmt++; } } return res;error: talloc_free(res); return NULL;}
char *mp_format_time(double time, bool fractions){ return mp_format_time_fmt(fractions ? "%H:%M:%S.%T" : "%H:%M:%S", time);}
// Set rc to the union of rc and rc2void mp_rect_union(struct mp_rect *rc, const struct mp_rect *rc2){ rc->x0 = MPMIN(rc->x0, rc2->x0); rc->y0 = MPMIN(rc->y0, rc2->y0); rc->x1 = MPMAX(rc->x1, rc2->x1); rc->y1 = MPMAX(rc->y1, rc2->y1);}
// Returns whether or not a point is contained by rcbool mp_rect_contains(struct mp_rect *rc, int x, int y){ return rc->x0 <= x && x < rc->x1 && rc->y0 <= y && y < rc->y1;}
// Set rc to the intersection of rc and src.// Return false if the result is empty.bool mp_rect_intersection(struct mp_rect *rc, const struct mp_rect *rc2){ rc->x0 = MPMAX(rc->x0, rc2->x0); rc->y0 = MPMAX(rc->y0, rc2->y0); rc->x1 = MPMIN(rc->x1, rc2->x1); rc->y1 = MPMIN(rc->y1, rc2->y1);
return rc->x1 > rc->x0 && rc->y1 > rc->y0;}
bool mp_rect_equals(struct mp_rect *rc1, struct mp_rect *rc2){ return rc1->x0 == rc2->x0 && rc1->y0 == rc2->y0 && rc1->x1 == rc2->x1 && rc1->y1 == rc2->y1;}
// This works like snprintf(), except that it starts writing the first output// character to str[strlen(str)]. This returns the number of characters the// string would have *appended* assuming a large enough buffer, will make sure// str is null-terminated, and will never write to str[size] or past.// Example:// int example(char *buf, size_t buf_size, double num, char *str) {// int n = 0;// n += mp_snprintf_cat(buf, size, "%f", num);// n += mp_snprintf_cat(buf, size, "%s", str);// return n; }// Note how this can be chained with functions similar in style.int mp_snprintf_cat(char *str, size_t size, const char *format, ...){ size_t len = strnlen(str, size); assert(!size || len < size); // str with no 0-termination is not allowed int r; va_list ap; va_start(ap, format); r = vsnprintf(str + len, size - len, format, ap); va_end(ap); return r;}
// Encode the unicode codepoint as UTF-8, and append to the end of the// talloc'ed buffer. All guarantees bstr_xappend() give applies, such as// implicit \0-termination for convenience.void mp_append_utf8_bstr(void *talloc_ctx, struct bstr *buf, uint32_t codepoint){ char data[8]; uint8_t tmp; char *output = data; PUT_UTF8(codepoint, tmp, *output++ = tmp;); bstr_xappend(talloc_ctx, buf, (bstr){data, output - data});}
// Parse a C/JSON-style escape beginning at code, and append the result to *str// using talloc. The input string (*code) must point to the first character// after the initial '\', and after parsing *code is set to the first character// after the current escape.// On error, false is returned, and all input remains unchanged.static bool mp_parse_escape(void *talloc_ctx, bstr *dst, bstr *code){ if (code->len < 1) return false; char replace = 0; switch (code->start[0]) { case '"': replace = '"'; break; case '\\': replace = '\\'; break; case '/': replace = '/'; break; case 'b': replace = '\b'; break; case 'f': replace = '\f'; break; case 'n': replace = '\n'; break; case 'r': replace = '\r'; break; case 't': replace = '\t'; break; case 'e': replace = '\x1b'; break; case '\'': replace = '\''; break; } if (replace) { bstr_xappend(talloc_ctx, dst, (bstr){&replace, 1}); *code = bstr_cut(*code, 1); return true; } if (code->start[0] == 'x' && code->len >= 3) { bstr num = bstr_splice(*code, 1, 3); char c = bstrtoll(num, &num, 16); if (num.len) return false; bstr_xappend(talloc_ctx, dst, (bstr){&c, 1}); *code = bstr_cut(*code, 3); return true; } if (code->start[0] == 'u' && code->len >= 5) { bstr num = bstr_splice(*code, 1, 5); uint32_t c = bstrtoll(num, &num, 16); if (num.len) return false; if (c >= 0xd800 && c <= 0xdbff) { if (code->len < 5 + 6 // udddd + \udddd || code->start[5] != '\\' || code->start[6] != 'u') return false; *code = bstr_cut(*code, 5 + 1); bstr num2 = bstr_splice(*code, 1, 5); uint32_t c2 = bstrtoll(num2, &num2, 16); if (num2.len || c2 < 0xdc00 || c2 > 0xdfff) return false; c = ((c - 0xd800) << 10) + 0x10000 + (c2 - 0xdc00); } mp_append_utf8_bstr(talloc_ctx, dst, c); *code = bstr_cut(*code, 5); return true; } return false;}
// Like mp_append_escaped_string, but set *dst to sliced *src if no escape// sequences have to be parsed (i.e. no memory allocation is required), and// if dst->start was NULL on function entry.bool mp_append_escaped_string_noalloc(void *talloc_ctx, bstr *dst, bstr *src){ bstr t = *src; int cur = 0; while (1) { if (cur >= t.len || t.start[cur] == '"') { *src = bstr_cut(t, cur); t = bstr_splice(t, 0, cur); if (dst->start == NULL) { *dst = t; } else { bstr_xappend(talloc_ctx, dst, t); } return true; } else if (t.start[cur] == '\\') { bstr_xappend(talloc_ctx, dst, bstr_splice(t, 0, cur)); t = bstr_cut(t, cur + 1); cur = 0; if (!mp_parse_escape(talloc_ctx, dst, &t)) goto error; } else { cur++; } }error: return false;}
// src is expected to point to a C-style string literal, *src pointing to the// first char after the starting '"'. It will append the contents of the literal// to *dst (using talloc_ctx) until the first '"' or the end of *str is found.// See bstr_xappend() how data is appended to *dst.// On success, *src will either start with '"', or be empty.// On error, return false, and *dst will contain the string until the first// error, *src is not changed.// Note that dst->start will be implicitly \0-terminated on successful return,// and if it was NULL or \0-terminated before calling the function.// As mentioned above, the caller is responsible for skipping the '"' chars.bool mp_append_escaped_string(void *talloc_ctx, bstr *dst, bstr *src){ if (mp_append_escaped_string_noalloc(talloc_ctx, dst, src)) { // Guarantee copy (or allocation). if (!dst->start || dst->start == src->start) { bstr res = *dst; *dst = (bstr){0}; bstr_xappend(talloc_ctx, dst, res); } return true; } return false;}
// Behaves like strerror()/strerror_r(), but is thread- and GNU-safe.char *mp_strerror_buf(char *buf, size_t buf_size, int errnum){ // This handles the nasty details of calling the right function for us. av_strerror(AVERROR(errnum), buf, buf_size); return buf;}
char *mp_tag_str_buf(char *buf, size_t buf_size, uint32_t tag){ if (buf_size < 1) return buf; buf[0] = '\0'; for (int n = 0; n < 4; n++) { uint8_t val = (tag >> (n * 8)) & 0xFF; if (mp_isalnum(val) || val == '_' || val == ' ') { mp_snprintf_cat(buf, buf_size, "%c", val); } else { mp_snprintf_cat(buf, buf_size, "[%d]", val); } } return buf;}
char *mp_tprintf_buf(char *buf, size_t buf_size, const char *format, ...){ va_list ap; va_start(ap, format); vsnprintf(buf, buf_size, format, ap); va_end(ap); return buf;}
char **mp_dup_str_array(void *tctx, char **s){ char **r = NULL; int num_r = 0; for (int n = 0; s && s[n]; n++) MP_TARRAY_APPEND(tctx, r, num_r, talloc_strdup(tctx, s[n])); if (r) MP_TARRAY_APPEND(tctx, r, num_r, NULL); return r;}
// Return rounded down integer log 2 of v, i.e. position of highest set bit.// mp_log2(0) == 0// mp_log2(1) == 0// mp_log2(31) == 4// mp_log2(32) == 5unsigned int mp_log2(uint32_t v){#if defined(__GNUC__) && __GNUC__ >= 4 return v ? 31 - __builtin_clz(v) : 0;#else for (int x = 31; x >= 0; x--) { if (v & (((uint32_t)1) << x)) return x; } return 0;#endif}
// If a power of 2, return it, otherwise return the next highest one, or 0.// mp_round_next_power_of_2(65) == 128// mp_round_next_power_of_2(64) == 64// mp_round_next_power_of_2(0) == 1// mp_round_next_power_of_2(UINT32_MAX) == 0uint32_t mp_round_next_power_of_2(uint32_t v){ for (int n = 0; n < 30; n++) { if ((1 << n) >= v) return 1 << n; } return 0;}