ref: 55a7978edf3511760bb23a268780846e5a6f25c3
dir: /common/mp4v2/mp4util.cpp/
/* * The contents of this file are subject to the Mozilla Public * License Version 1.1 (the "License"); you may not use this file * except in compliance with the License. You may obtain a copy of * the License at http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or * implied. See the License for the specific language governing * rights and limitations under the License. * * The Original Code is MPEG4IP. * * The Initial Developer of the Original Code is Cisco Systems Inc. * Portions created by Cisco Systems Inc. are * Copyright (C) Cisco Systems Inc. 2001. All Rights Reserved. * * Contributor(s): * Dave Mackie [email protected] */ #include "mp4common.h" void MP4Error::Print(FILE* pFile) { fprintf(pFile, "MP4ERROR: "); if (m_where) { fprintf(pFile, "%s", m_where); } if (m_errstring) { if (m_where) { fprintf(pFile, ": "); } fprintf(pFile, "%s", m_errstring); } if (m_errno) { if (m_where || m_errstring) { fprintf(pFile, ": "); } fprintf(pFile, "%s", strerror(m_errno)); } fprintf(pFile, "\n"); } void MP4HexDump( u_int8_t* pBytes, u_int32_t numBytes, FILE* pFile, u_int8_t indent) { if (pFile == NULL) { pFile = stdout; } Indent(pFile, indent); fprintf(pFile, "<%u bytes> ", numBytes); for (u_int32_t i = 0; i < numBytes; i++) { if ((i % 16) == 0 && numBytes > 16) { fprintf(pFile, "\n"); Indent(pFile, indent); } fprintf(pFile, "%02x ", pBytes[i]); } fprintf(pFile, "\n"); } bool MP4NameFirstMatches(const char* s1, const char* s2) { if (s1 == NULL || *s1 == '\0' || s2 == NULL || *s2 == '\0') { return false; } if (*s2 == '*') { return true; } while (*s1 != '\0') { if (*s2 == '\0' || strchr("[.", *s2)) { break; } if (tolower(*s1) != tolower(*s2)) { return false; } s1++; s2++; } return true; } bool MP4NameFirstIndex(const char* s, u_int32_t* pIndex) { if (s == NULL) { return false; } while (*s != '\0' && *s != '.') { if (*s == '[') { s++; ASSERT(pIndex); if (sscanf(s, "%u", pIndex) != 1) { return false; } return true; } s++; } return false; } char* MP4NameFirst(const char *s) { if (s == NULL) { return NULL; } const char* end = s; while (*end != '\0' && *end != '.') { end++; } char* first = (char*)MP4Calloc((end - s) + 1); if (first) { strncpy(first, s, end - s); } return first; } const char* MP4NameAfterFirst(const char *s) { if (s == NULL) { return NULL; } while (*s != '\0') { if (*s == '.') { s++; if (*s == '\0') { return NULL; } return s; } s++; } return NULL; } char* MP4ToBase16(const u_int8_t* pData, u_int32_t dataSize) { if (dataSize) { ASSERT(pData); } char* s = (char*)MP4Calloc((2 * dataSize) + 1); u_int32_t i, j; for (i = 0, j = 0; i < dataSize; i++) { sprintf(&s[j], "%02x", pData[i]); j += 2; } return s; /* N.B. caller is responsible for free'ing s */ } char* MP4ToBase64(const u_int8_t* pData, u_int32_t dataSize) { if (dataSize) { ASSERT(pData); } static char encoding[64] = { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P', 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f', 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v', 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' }; char* s = (char*)MP4Calloc((((dataSize + 2) * 4) / 3) + 1); const u_int8_t* src = pData; char* dest = s; u_int32_t numGroups = dataSize / 3; for (u_int32_t i = 0; i < numGroups; i++) { *dest++ = encoding[src[0] >> 2]; *dest++ = encoding[((src[0] & 0x03) << 4) | (src[1] >> 4)]; *dest++ = encoding[((src[1] & 0x0F) << 2) | (src[2] >> 6)]; *dest++ = encoding[src[2] & 0x3F]; src += 3; } if (dataSize % 3 == 1) { *dest++ = encoding[src[0] >> 2]; *dest++ = encoding[((src[0] & 0x03) << 4)]; *dest++ = '='; *dest++ = '='; } else if (dataSize % 3 == 2) { *dest++ = encoding[src[0] >> 2]; *dest++ = encoding[((src[0] & 0x03) << 4) | (src[1] >> 4)]; *dest++ = encoding[((src[1] & 0x0F) << 2)]; *dest++ = '='; } return s; /* N.B. caller is responsible for free'ing s */ } // log2 of value, rounded up static u_int8_t ilog2(u_int64_t value) { u_int64_t powerOf2 = 1; for (u_int8_t i = 0; i < 64; i++) { if (value <= powerOf2) { return i; } powerOf2 <<= 1; } return 64; } u_int64_t MP4ConvertTime(u_int64_t t, u_int32_t oldTimeScale, u_int32_t newTimeScale) { // avoid float point exception if (oldTimeScale == 0) { throw new MP4Error("division by zero", "MP4ConvertTime"); } // check if we can safely use integer operations if (ilog2(t) + ilog2(newTimeScale) <= 64) { return (t * newTimeScale) / oldTimeScale; } // final resort is to use floating point double d = (double)newTimeScale / (double)oldTimeScale; #ifdef _WINDOWS d *= (double)(int64_t)t; #else d *= (double)t; #endif return (u_int64_t)d; }