static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) { AVCodecContext *acodec, *vcodec; ByteIOContext *ioc; AMFDataType amf_type; char str_val[256]; double num_val; num_val = 0; ioc = s->pb; amf_type = get_byte(ioc); switch(amf_type) { case AMF_DATA_TYPE_NUMBER: num_val = av_int2dbl(get_be64(ioc)); break; case AMF_DATA_TYPE_BOOL: num_val = get_byte(ioc); break; case AMF_DATA_TYPE_STRING: if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0) return -1; break; case AMF_DATA_TYPE_OBJECT: { unsigned int keylen; while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) { url_fskip(ioc, keylen); //skip key string if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) return -1; //if we couldn't skip, bomb out. } if(get_byte(ioc) != AMF_END_OF_OBJECT) return -1; } break; case AMF_DATA_TYPE_NULL: case AMF_DATA_TYPE_UNDEFINED: case AMF_DATA_TYPE_UNSUPPORTED: break; //these take up no additional space case AMF_DATA_TYPE_MIXEDARRAY: url_fskip(ioc, 4); //skip 32-bit max array index while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { //this is the only case in which we would want a nested parse to not skip over the object if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0) return -1; } if(get_byte(ioc) != AMF_END_OF_OBJECT) return -1; break; case AMF_DATA_TYPE_ARRAY: { unsigned int arraylen, i; arraylen = get_be32(ioc); for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) { if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) return -1; //if we couldn't skip, bomb out. } } break; case AMF_DATA_TYPE_DATE: url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16) break; default: //unsupported type, we couldn't skip return -1; } if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL acodec = astream ? astream->codec : NULL; vcodec = vstream ? vstream->codec : NULL; if(amf_type == AMF_DATA_TYPE_BOOL) { } else if(amf_type == AMF_DATA_TYPE_NUMBER) { if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE; else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0)) vcodec->bit_rate = num_val * 1024.0; } } return 0; }