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winamp/Src/external_dependencies/libmp4v2/mp4util.cpp

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/*
* 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. 2001-2005. All Rights Reserved.
*
* Contributor(s):
* Dave Mackie dmackie@cisco.com
* Bill May wmay@cisco.com
*/
#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);
}
uint size = 2 * dataSize + 1;
char* s = (char*)MP4Calloc(size);
u_int32_t i, j;
for (i = 0, j = 0; i < dataSize; i++) {
size -= snprintf(&s[j], size, "%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 (pData == NULL || dataSize == 0) return NULL;
static const 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;
if (pData == NULL) return NULL;
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++ = '=';
}
*dest = '\0';
return s; /* N.B. caller is responsible for free'ing s */
}
static bool convertBase64 (const char data, uint8_t *value)
{
static const uint8_t decodingarr64[128] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff,
};
uint8_t index = (uint8_t)data;
if ((index & 0x80) != 0) return false;
if (decodingarr64[index] == 0xff) return false;
*value = decodingarr64[index];
return true;
}
uint8_t *Base64ToBinary (const char *pData, uint32_t decodeSize, uint32_t *pDataSize)
{
uint8_t *ret;
uint32_t size, ix, groups;
if (pData == NULL || decodeSize == 0 || pDataSize == NULL)
return NULL;
if ((decodeSize % 4) != 0) {
// must be multiples of 4 characters
return NULL;
}
size = (decodeSize * 3) / 4;
groups = decodeSize / 4;
ret = (uint8_t *)MP4Calloc(size);
if (ret == NULL) return NULL;
for (ix = 0; ix < groups; ix++) {
uint8_t value[4];
for (uint8_t jx = 0; jx < 4; jx++) {
if (pData[jx] == '=') {
if (ix != (groups - 1)) {
free(ret);
return NULL;
}
size--;
value[jx] = 0;
} else if (convertBase64(pData[jx], &value[jx]) == false) {
free(ret);
return NULL;
}
}
ret[(ix * 3)] = value[0] << 2 | ((value[1] >> 4) & 0x3);
ret[(ix * 3) + 1] = (value[1] << 4) | (value[2] >> 2 & 0xf);
ret[(ix * 3) + 2] = ((value[2] & 0x3) << 6) | value[3];
pData += 4;
}
*pDataSize = size;
return ret;
}
// 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");
}
if (oldTimeScale == newTimeScale)
return t;
// check if we can safely use integer operations
if (ilog2(t) + ilog2(newTimeScale) <= 64) {
double d = ((double) t / (double) oldTimeScale) * (double) newTimeScale;
return (u_int64_t)d;
}
// final resort is to use floating point
//double d = (double)newTimeScale;
//d *= UINT64_TO_DOUBLE(t);
//d /= (double)oldTimeScale;
//d += 0.5; // round up.
double d = (double)newTimeScale;
d /= (double)oldTimeScale;
d *= UINT64_TO_DOUBLE(t);
d += 0.5; // round up.
return (u_int64_t)d;
}
const char* MP4NormalizeTrackType (const char* type,
uint32_t verbosity)
{
if (!strcasecmp(type, "vide")
|| !strcasecmp(type, "video")
|| !strcasecmp(type, "mp4v")
|| !strcasecmp(type, "avc1")
|| !strcasecmp(type, "s263") // 3GPP H.263
|| !strcasecmp(type, "encv")) {
return MP4_VIDEO_TRACK_TYPE;
}
if (!strcasecmp(type, "soun")
|| !strcasecmp(type, "sound")
|| !strcasecmp(type, "audio")
|| !strcasecmp(type, "enca")
|| !strcasecmp(type, "samr") // 3GPP AMR
|| !strcasecmp(type, "sawb") // 3GPP AMR/WB
|| !strcasecmp(type, "mp4a")) {
return MP4_AUDIO_TRACK_TYPE;
}
if (!strcasecmp(type, "sdsm")
|| !strcasecmp(type, "scene")
|| !strcasecmp(type, "bifs")) {
return MP4_SCENE_TRACK_TYPE;
}
if (!strcasecmp(type, "odsm")
|| !strcasecmp(type, "od")) {
return MP4_OD_TRACK_TYPE;
}
if (strcasecmp(type, "cntl") == 0) {
return MP4_CNTL_TRACK_TYPE;
}
VERBOSE_WARNING(verbosity,
printf("Attempt to normalize %s did not match\n",
type));
return type;
}
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