114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
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struct FLV_Pack {
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int len;
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int buf;
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bool isKeyframe;
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char * data;
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};//FLV_Pack
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char FLVHeader[13];
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bool All_Hell_Broke_Loose = false;
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//checks FLV Header for correctness
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//returns true if everything is alright, false otherwise
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bool FLV_Checkheader(char * header){
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if (header[0] != 'F') return false;
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if (header[1] != 'L') return false;
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if (header[2] != 'V') return false;
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if (header[8] != 0x09) return false;
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if (header[9] != 0) return false;
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if (header[10] != 0) return false;
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if (header[11] != 0) return false;
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if (header[12] != 0) return false;
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return true;
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}//FLV_Checkheader
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//returns true if header is an FLV header
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bool FLV_Isheader(char * header){
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if (header[0] != 'F') return false;
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if (header[1] != 'L') return false;
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if (header[2] != 'V') return false;
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return true;
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}//FLV_Isheader
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bool ReadUntil(char * buffer, unsigned int count, unsigned int & sofar, int sock){
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if (sofar >= count){return true;}
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int r = 0;
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r = DDV_read(buffer + sofar,count-sofar,sock);
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fprintf(stderr, "Reading %i/%i, read %i, at %i\n", count, sofar, r, buffer+sofar);
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if (r < 0){
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if (errno != EWOULDBLOCK){
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All_Hell_Broke_Loose = true;
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fprintf(stderr, "ReadUntil fail: %s. All Hell Broke Loose!\n", strerror(errno));
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}
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return false;
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}
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sofar += r;
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if (sofar == count){return true;}
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if (sofar > count){
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All_Hell_Broke_Loose = true;
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fprintf(stderr, "ReadUntil fail: %s. Read too much. All Hell Broke Loose!\n", strerror(errno));
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}
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return false;
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}
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//gets a packet, storing in given FLV_Pack pointer.
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//will assign pointer if null
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//resizes FLV_Pack data field bigger if data doesn't fit
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// (does not auto-shrink for speed!)
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bool FLV_GetPacket(FLV_Pack *& p, int sock){
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static bool done = true;
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static unsigned int sofar = 0;
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if (!p){p = (FLV_Pack*)calloc(1, sizeof(FLV_Pack));}
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if (p->buf < 15){p->data = (char*)realloc(p->data, 5000); p->buf = 5000;}
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if (done){
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//read a header
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if (ReadUntil(p->data, 11, sofar, sock)){
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//if its a correct FLV header, throw away and read tag header
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if (FLV_Isheader(p->data)){
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if (ReadUntil(p->data, 13, sofar, sock)){
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if (FLV_Checkheader(p->data)){
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sofar = 0;
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memcpy(FLVHeader, p->data, 13);
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}else{
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All_Hell_Broke_Loose = true;
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fprintf(stderr, "Invalid FLV header. All Hell Broke Loose!\n");
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}
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}
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}else{
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//if a tag header, calculate length and read tag body
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p->len = p->data[3] + 15;
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p->len += (p->data[2] << 8);
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p->len += (p->data[1] << 16);
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//fprintf(stderr, "Tag of len %i\n", p->len);
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if (p->buf < p->len){p->data = (char*)realloc(p->data, p->len);p->buf = p->len;}
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done = false;
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}
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}
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}else{
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//read tag body
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if (ReadUntil(p->data, p->len, sofar, sock)){
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//calculate keyframeness, next time read header again, return true
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p->isKeyframe = false;
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if ((p->data[0] == 0x09) && (((p->data[11] & 0xf0) >> 4) == 1)){p->isKeyframe = true;}
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int testlen = p->data[p->len-1] + 4;
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testlen += (p->data[p->len-2] << 8);
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testlen += (p->data[p->len-3] << 16);
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testlen += (p->data[p->len-4] << 24);
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if (p->len == testlen){
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fprintf(stderr, "Correct length tag...\n");
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}else{
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fprintf(stderr, "Len: %i, testlen: %i\n", p->len, testlen);
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All_Hell_Broke_Loose = true;
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fprintf(stderr, "ReadUntil fail: > 500kb tag? All Hell Broke Loose!\n", strerror(errno));
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return false;
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}
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done = true;
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sofar = 0;
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return true;
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}
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}
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return false;
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}//FLV_GetPacket
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