root/trunk/CommonUtils.c

/*
 *  CommonUtils.c
 *  Perian
 *
 *  Created by David Conrad on 10/13/06.
 *  Copyright 2006 Perian Project. All rights reserved.
 *
 */

#include "avcodec.h"
#include "CommonUtils.h"


typedef struct LanguageTriplet {
        char twoChar[3];
        char threeChar[4];      // (ISO 639-2 3 char code)
        short qtLang;
} LanguageTriplet;

// don't think there's a function already to do ISO 639-1/2 -> language code 
// that SetMediaLanguage() accepts
static const LanguageTriplet ISO_QTLanguages[] = {
        { "",   "und", langUnspecified },
        { "af", "afr", langAfrikaans },
        { "sq", "alb", langAlbanian },
        { "sq", "sqi", langAlbanian },
        { "am", "amh", langAmharic },
        { "ar", "ara", langArabic },
        { "hy", "arm", langArmenian },
        { "hy", "hye", langArmenian },
        { "as", "asm", langAssamese }, 
        { "ay", "aym", langAymara },
        { "az", "aze", langAzerbaijani },
        { "eu", "baq", langBasque },
        { "eu", "eus", langBasque },
        { "bn", "ben", langBengali },
        { "br", "bre", langBreton },
        { "bg", "bul", langBulgarian },
        { "my", "bur", langBurmese },
        { "my", "mya", langBurmese },
        { "ca", "cat", langCatalan },
        { "zh", "chi", langTradChinese },
        { "zh", "zho", langTradChinese },
        { "cs", "cze", langCzech },
        { "cs", "ces", langCzech },
        { "da", "dan", langDanish },
        { "nl", "dut", langDutch },
        { "nl", "nld", langDutch },
        { "dz", "dzo", langDzongkha },
        { "en", "eng", langEnglish },
        { "eo", "epo", langEsperanto },
        { "et", "est", langEstonian },
        { "fo", "fao", langFaroese },
        { "fi", "fin", langFinnish },
        { "fr", "fre", langFrench },
        { "fr", "fra", langFrench },
        { "ka", "geo", langGeorgian },
        { "ka", "kat", langGeorgian },
        { "de", "ger", langGerman },
        { "de", "deu", langGerman },
        { "gl", "glg", langGalician },
        { "gd", "gla", langScottishGaelic },
        { "ga", "gle", langIrishGaelic },
        { "gv", "glv", langManxGaelic },
        { "",   "grc", langGreekAncient },
        { "el", "gre", langGreek },
        { "el", "ell", langGreek },
        { "gn", "grn", langGuarani },
        { "gu", "guj", langGujarati },
        { "he", "heb", langHebrew },
        { "hi", "hin", langHindi },
        { "hu", "hun", langHungarian },
        { "is", "ice", langIcelandic },
        { "is", "isl", langIcelandic },
        { "id", "ind", langIndonesian },
        { "it", "ita", langItalian },
        { "jv", "jav", langJavaneseRom },
        { "ja", "jpn", langJapanese },
        { "kl", "kal", langGreenlandic },
        { "kn", "kan", langKannada },
        { "ks", "kas", langKashmiri },
        { "kk", "kaz", langKazakh },
        { "km", "khm", langKhmer },
        { "rw", "kin", langKinyarwanda },
        { "ky", "kir", langKirghiz },
        { "ko", "kor", langKorean },
        { "ku", "kur", langKurdish },
        { "lo", "lao", langLao },
        { "la", "lat", langLatin },
        { "lv", "lav", langLatvian },
        { "lt", "lit", langLithuanian },
        { "mk", "mac", langMacedonian },
        { "mk", "mkd", langMacedonian },
        { "ml", "mal", langMalayalam },
        { "mr", "mar", langMarathi },
        { "ms", "may", langMalayRoman },
        { "ms", "msa", langMalayRoman },
        { "mg", "mlg", langMalagasy },
        { "mt", "mlt", langMaltese },
        { "mo", "mol", langMoldavian },
        { "mn", "mon", langMongolian },
        { "ne", "nep", langNepali },
        { "nb", "nob", langNorwegian },         // Norwegian Bokmal
        { "no", "nor", langNorwegian },
        { "nn", "nno", langNynorsk },
        { "ny", "nya", langNyanja },
        { "or", "ori", langOriya },
        { "om", "orm", langOromo },
        { "pa", "pan", langPunjabi },
        { "fa", "per", langPersian },
        { "fa", "fas", langPersian },
        { "pl", "pol", langPolish },
        { "pt", "por", langPortuguese },
        { "qu", "que", langQuechua },
        { "ro", "rum", langRomanian },
        { "ro", "ron", langRomanian },
        { "rn", "run", langRundi },
        { "ru", "rus", langRussian },
        { "sa", "san", langSanskrit },
        { "sr", "scc", langSerbian },
        { "sr", "srp", langSerbian },
        { "hr", "scr", langCroatian },
        { "hr", "hrv", langCroatian },
        { "si", "sin", langSinhalese },
        { "",   "sit", langTibetan },           // Sino-Tibetan (Other)
        { "sk", "slo", langSlovak },
        { "sk", "slk", langSlovak },
        { "sl", "slv", langSlovenian },
        { "se", "sme", langSami },
        { "",   "smi", langSami },                      // Sami languages (Other)
        { "sd", "snd", langSindhi },
        { "so", "som", langSomali },
        { "es", "spa", langSpanish },
        { "su", "sun", langSundaneseRom },
        { "sw", "swa", langSwahili },
        { "sv", "swe", langSwedish },
        { "ta", "tam", langTamil },
        { "tt", "tat", langTatar },
        { "te", "tel", langTelugu },
        { "tg", "tgk", langTajiki },
        { "tl", "tgl", langTagalog },
        { "th", "tha", langThai },
        { "bo", "tib", langTibetan },
        { "bo", "bod", langTibetan },
        { "ti", "tir", langTigrinya },
        { "",   "tog", langTongan },            // Tonga (Nyasa, Tonga Islands)
        { "tr", "tur", langTurkish },
        { "tk", "tuk", langTurkmen },
        { "ug", "uig", langUighur },
        { "uk", "ukr", langUkrainian },
        { "ur", "urd", langUrdu },
        { "uz", "uzb", langUzbek },
        { "vi", "vie", langVietnamese },
        { "cy", "wel", langWelsh },
        { "cy", "cym", langWelsh },
        { "yi", "yid", langYiddish }
};

short ISO639_1ToQTLangCode(const char *lang)
{
        int i;
        
        if (strlen(lang) != 2)
                return langUnspecified;
        
        for (i = 0; i < sizeof(ISO_QTLanguages) / sizeof(LanguageTriplet); i++) {
                if (strcasecmp(lang, ISO_QTLanguages[i].twoChar) == 0)
                        return ISO_QTLanguages[i].qtLang;
        }
        
        return langUnspecified;
}

short ISO639_2ToQTLangCode(const char *lang)
{
        int i;
        
        if (strlen(lang) != 3)
                return langUnspecified;
        
        for (i = 0; i < sizeof(ISO_QTLanguages) / sizeof(LanguageTriplet); i++) {
                if (strcasecmp(lang, ISO_QTLanguages[i].threeChar) == 0)
                        return ISO_QTLanguages[i].qtLang;
        }
        
        return langUnspecified;
}

/* write the int32_t data to target & then return a pointer which points after that data */
uint8_t *write_int32(uint8_t *target, int32_t data)
{
        return write_data(target, (uint8_t*)&data, sizeof(data));
} /* write_int32() */

/* write the int16_t data to target & then return a pointer which points after that data */
uint8_t *write_int16(uint8_t *target, int16_t data)
{
        return write_data(target, (uint8_t*)&data, sizeof(data));
} /* write_int16() */

/* write the data to the target adress & then return a pointer which points after the written data */
uint8_t *write_data(uint8_t *target, uint8_t* data, int32_t data_size)
{
        if(data_size > 0)
                memcpy(target, data, data_size);
        return (target + data_size);
} /* write_data() */



#define MP4ESDescrTag                   0x03
#define MP4DecConfigDescrTag            0x04
#define MP4DecSpecificDescrTag          0x05

// based off of mov_mp4_read_descr_len from mov.c in ffmpeg's libavformat
static int readDescrLen(UInt8 **buffer)
{
        int len = 0;
        int count = 4;
        while (count--) {
                int c = *(*buffer)++;
                len = (len << 7) | (c & 0x7f);
                if (!(c & 0x80))
                        break;
        }
        return len;
}

// based off of mov_mp4_read_descr from mov.c in ffmpeg's libavformat
static int readDescr(UInt8 **buffer, int *tag)
{
        *tag = *(*buffer)++;
        return readDescrLen(buffer);
}

// based off of mov_read_esds from mov.c in ffmpeg's libavformat
ComponentResult ReadESDSDescExt(Handle descExt, UInt8 **buffer, int *size)
{
        UInt8 *esds = (UInt8 *) *descExt;
        int tag, len;
        
        *size = 0;
        
        esds += 4;              // version + flags
        len = readDescr(&esds, &tag);
        esds += 2;              // ID
        if (tag == MP4ESDescrTag)
                esds++;         // priority
        
        len = readDescr(&esds, &tag);
        if (tag == MP4DecConfigDescrTag) {
                esds++;         // object type id
                esds++;         // stream type
                esds += 3;      // buffer size db
                esds += 4;      // max bitrate
                esds += 4;      // average bitrate
                
                len = readDescr(&esds, &tag);
                if (tag == MP4DecSpecificDescrTag) {
                        *buffer = calloc(1, len + FF_INPUT_BUFFER_PADDING_SIZE);
                        if (*buffer) {
                                memcpy(*buffer, esds, len);
                                *size = len;
                        }
                }
        }
        
        return noErr;
}

int isImageDescriptionExtensionPresent(ImageDescriptionHandle desc, long type)
{
        ImageDescriptionPtr d = *desc;
        int offset = sizeof(ImageDescription);
        uint8_t *p = (uint8_t *)d;
        
        //read next description, need 8 bytes for size and type
        while(offset < d->idSize - 8)
        {
                long len = *(p+offset) << 24 | *(p+offset+1) << 16 | *(p+offset+2) << 8 | *(p+offset+3);
                long rtype = *(p+offset + 4) << 24 | *(p+offset+5) << 16 | *(p+offset+6) << 8 | *(p+offset+7);
                if(rtype == type && offset + len <= d->idSize)
                        return 1;
                offset += len;
        }
        return 0;
}

int IsFrameDroppingEnabled()
{
        static int enabled = -1;
        
        if (enabled == -1) enabled = getenv("PerianNoFrameDropping") == NULL;
        
        return enabled;
}